mysql之MHA高可用

最新推荐文章于 2025-05-11 16:18:24 发布

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最新推荐文章于 2025-05-11 16:18:24 发布

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文章标签：后端

本文链接：https://blog.youkuaiyun.com/ITwang1/article/details/121744654

一、MHA相关概念

什么是 MHA

MHA（MasterHigh Availability）是一套优秀的MySQL高可用环境下故障切换和主从复制的软件。
MySQL故障切换过程中，MHA能做到0-30秒内自动完成故障切换操作。
MHA能在故障切换的过程中最大程度上保证数据的一致性，以达到真正意义上的高可用。
MHA 的出现就是解决MySQL 单点故障的问题。

MHA 的组成

MHA Node（数据节点）
MHA Node 运行在每台 MySQL 服务器上。
MHA Manager（管理节点）
MHA Manager 可以单独部署在一台独立的机器上，管理多个 master-slave 集群；也可以部署在一台 slave 节点上。
MHA Manager 会定时探测集群中的 master 节点。当 master 出现故障时，它可以自动将最新数据的 slave 提升为新的 master，然后将所有其他的 slave 重新指向新的 master。整个故障转移过程对应用程序完全透明。

MHA 的特点

自动故障切换过程中，MHA试图从宕机的主服务器上保存二进制日志，最大程度的保证数据不丢失
使用半同步复制，可以大大降低数据丢失的风险，如果只有一个slave已经收到了最新的二进制日志，MHA可以将最新的二进制日志应用于其他所有的slave服务器上，因此可以保证所有节点的数据一致性
目前MHA支持一主多从架构，最少三台服务，即一主两从

二、MySQL+MHA部署实验

主机	操作系统	IP地址	安装包 / 软件 / 工具
Master 节点服务器	CentOS7.4(64位)	192.168.153.60	mysql-boost-5.7.20.tar.gz、MHA node组件
Slave1 节点服务器	CentOS7.4(64位)	192.168.153.50	mysql-boost-5.7.20.tar.gz、MHA node组件
Slave2 节点服务器	CentOS7.4(64位)	192.168.153.40	mysql-boost-5.7.20.tar.gz、MHA node组件
MHA manager 节点服务器	CentOS7.4(64位)	192.168.153.30	MHAmanager组件、MHA node组件

①关闭系统防火墙和安全机制(全部服务器）

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">systemctl</span> <span style="color:#ee9900">stop</span> <span style="color:#ee9900">firewalld</span>
<span style="color:#ee9900">systemctl</span> <span style="color:#ee9900">disable</span> <span style="color:#ee9900">firewalld</span>
<span style="color:#ee9900">setenforce</span> <span style="color:#98c379">0</span>
</code></span></span>

②修改节点的主机名(Master、Slave1、Slave2)

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">hostnamectl</span> <span style="color:#ee9900">set-hostname</span> <span style="color:#ee9900">Mysql1</span>
<span style="color:#ee9900">su</span> <span style="color:#ee9900">-</span>
<span style="color:#ee9900">hostnamectl</span> <span style="color:#ee9900">set-hostname</span> <span style="color:#ee9900">Mysql2</span>
<span style="color:#ee9900">su</span> <span style="color:#ee9900">-</span>
<span style="color:#ee9900">hostnamectl</span> <span style="color:#ee9900">set-hostname</span> <span style="color:#ee9900">Mysql3</span>
<span style="color:#ee9900">su</span> <span style="color:#ee9900">-</span>
</code></span></span>

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③修改三台MySQL服务器的主配置文件

Master 节点(192.168.153.60)

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">vim</span> <span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">my</span><span style="color:#999999">.</span><span style="color:#ee9900">cnf</span>
<span style="color:#999999">[</span><span style="color:#ee9900">mysqld</span><span style="color:#999999">]</span>
<span style="color:#ee9900">server-id</span> <span style="color:#999999">=</span> <span style="color:#98c379">60</span>
<span style="color:#ee9900">log_bin</span> <span style="color:#999999">=</span> <span style="color:#ee9900">master-bin</span>
<span style="color:#ee9900">log-slave-updates</span> <span style="color:#999999">=</span> <span style="color:#56b6c2">true</span>

<span style="color:#ee9900">systemctl</span> <span style="color:#ee9900">restart</span> <span style="color:#ee9900">mysqld</span>
<span style="color:#ee9900">ln</span> <span style="color:#ee9900">-s</span> <span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">mysql</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">mysql</span> <span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">sbin</span><span style="color:#999999">/</span>
<span style="color:#ee9900">ln</span> <span style="color:#ee9900">-s</span> <span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">mysql</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">mysqlbinlog</span> <span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">sbin</span><span style="color:#999999">/</span>
</code></span></span>

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slaves1(192.168.153.50)、slaves2(192.168.153.40)

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">vim</span> <span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">my</span><span style="color:#999999">.</span><span style="color:#ee9900">cnf</span>
<span style="color:#ee9900">server-id</span> <span style="color:#999999">=</span> <span style="color:#98c379">50</span> 						<span style="color:#c678dd">#三台服务器的</span> <span style="color:#ee9900">server-id</span> <span style="color:#ee9900">不能一样</span>
<span style="color:#999999">(</span><span style="color:#ee9900">server-id</span> <span style="color:#999999">=</span> <span style="color:#98c379">40</span><span style="color:#999999">)</span> 
<span style="color:#ee9900">log_bin</span> <span style="color:#999999">=</span> <span style="color:#ee9900">master-bin</span>
<span style="color:#ee9900">relay-log</span> <span style="color:#999999">=</span> <span style="color:#ee9900">relay-log-bin</span>
<span style="color:#ee9900">relay-log-index</span> <span style="color:#999999">=</span> <span style="color:#ee9900">slave-relay-bin</span><span style="color:#999999">.</span><span style="color:#ee9900">index</span>

<span style="color:#ee9900">systemctl</span> <span style="color:#ee9900">restart</span> <span style="color:#ee9900">mysqld</span>
<span style="color:#ee9900">ln</span> <span style="color:#ee9900">-s</span> <span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">mysql</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">mysql</span> <span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">sbin</span><span style="color:#999999">/</span>
<span style="color:#ee9900">ln</span> <span style="color:#ee9900">-s</span> <span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">mysql</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">mysqlbinlog</span> <span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">sbin</span><span style="color:#999999">/</span>
</code></span></span>

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④配置 mysql 一主两从

所有数据库节点进行 mysql 授权

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">mysql</span> <span style="color:#ee9900">-uroot</span> <span style="color:#ee9900">-p</span>
<span style="color:#ee9900">grant</span> <span style="color:#ee9900">replication</span> <span style="color:#ee9900">slave</span> <span style="color:#ee9900">on</span> <span style="color:#999999">*</span><span style="color:#999999">.</span><span style="color:#999999">*</span> <span style="color:#ee9900">to</span> <span style="color:#669900">'myslave'</span><span style="color:#999999">@</span><span style="color:#669900">'192.168.153.%'</span> <span style="color:#ee9900">identified</span> <span style="color:#ee9900">by</span> <span style="color:#669900">'123456'</span><span style="color:#999999">;</span>		<span style="color:#999999">#</span><span style="color:#ee9900">从数据库同步使用</span>
<span style="color:#ee9900">grant</span> <span style="color:#ee9900">all</span> <span style="color:#ee9900">privileges</span> <span style="color:#ee9900">on</span> <span style="color:#999999">*</span><span style="color:#999999">.</span><span style="color:#999999">*</span> <span style="color:#ee9900">to</span> <span style="color:#669900">'mha'</span><span style="color:#999999">@</span><span style="color:#669900">'192.168.153.%'</span> <span style="color:#ee9900">identified</span> <span style="color:#ee9900">by</span> <span style="color:#669900">'manager'</span><span style="color:#999999">;</span>	    	<span style="color:#999999">#</span><span style="color:#ee9900">manager使用</span>

<span style="color:#ee9900">grant</span> <span style="color:#ee9900">all</span> <span style="color:#ee9900">privileges</span> <span style="color:#ee9900">on</span> <span style="color:#999999">*</span><span style="color:#999999">.</span><span style="color:#999999">*</span> <span style="color:#ee9900">to</span> <span style="color:#669900">'mha'</span><span style="color:#999999">@</span><span style="color:#669900">'Mysql1'</span> <span style="color:#ee9900">identified</span> <span style="color:#ee9900">by</span> <span style="color:#669900">'manager'</span><span style="color:#999999">;</span>				    <span style="color:#999999">#</span><span style="color:#ee9900">防止从库通过主机名连接不上主库</span>
<span style="color:#ee9900">grant</span> <span style="color:#ee9900">all</span> <span style="color:#ee9900">privileges</span> <span style="color:#ee9900">on</span> <span style="color:#999999">*</span><span style="color:#999999">.</span><span style="color:#999999">*</span> <span style="color:#ee9900">to</span> <span style="color:#669900">'mha'</span><span style="color:#999999">@</span><span style="color:#669900">'Mysql2'</span> <span style="color:#ee9900">identified</span> <span style="color:#ee9900">by</span> <span style="color:#669900">'manager'</span><span style="color:#999999">;</span>
<span style="color:#ee9900">grant</span> <span style="color:#ee9900">all</span> <span style="color:#ee9900">privileges</span> <span style="color:#ee9900">on</span> <span style="color:#999999">*</span><span style="color:#999999">.</span><span style="color:#999999">*</span> <span style="color:#ee9900">to</span> <span style="color:#669900">'mha'</span><span style="color:#999999">@</span><span style="color:#669900">'Mysql3'</span> <span style="color:#ee9900">identified</span> <span style="color:#ee9900">by</span> <span style="color:#669900">'manager'</span><span style="color:#999999">;</span>
<span style="color:#ee9900">flush</span> <span style="color:#ee9900">privileges</span><span style="color:#999999">;</span>
</code></span></span>

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Master 节点查看二进制文件和同步点

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">show</span> <span style="color:#ee9900">master</span> <span style="color:#ee9900">status</span><span style="color:#999999">;</span>
</code></span></span>

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slaves1(192.168.153.50)、slaves2(192.168.153.40)

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">change</span> <span style="color:#ee9900">master</span> <span style="color:#ee9900">to</span> <span style="color:#ee9900">master_host</span><span style="color:#999999">=</span><span style="color:#669900">'192.168.153.60'</span><span style="color:#999999">,</span><span style="color:#ee9900">master_user</span><span style="color:#999999">=</span><span style="color:#669900">'myslave'</span><span style="color:#999999">,</span><span style="color:#ee9900">master_password</span><span style="color:#999999">=</span><span style="color:#669900">'123456'</span><span style="color:#999999">,</span><span style="color:#ee9900">master_log_file</span><span style="color:#999999">=</span><span style="color:#669900">'master-bin.000002'</span><span style="color:#999999">,</span><span style="color:#ee9900">master_log_pos</span><span style="color:#999999">=</span><span style="color:#98c379">6222</span><span style="color:#999999">;</span> 

<span style="color:#ee9900">start</span> <span style="color:#ee9900">slave</span><span style="color:#999999">;</span>
</code></span></span>

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在 Slave1、Slave2 节点查看数据同步结果

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">show</span> <span style="color:#ee9900">slave</span> <span style="color:#ee9900">status</span><span style="color:#999999">\</span><span style="color:#ee9900">G</span>		  <span style="color:#999999">#</span><span style="color:#ee9900">确保</span> <span style="color:#ee9900">IO</span> <span style="color:#ee9900">和</span> <span style="color:#ee9900">SQL</span> <span style="color:#ee9900">线程都是</span> <span style="color:#ee9900">Yes，代表同步正常。</span>

<span style="color:#ee9900">Slave_IO_Running:</span> <span style="color:#ee9900">Yes</span>
<span style="color:#ee9900">Slave_SQL_Running:</span> <span style="color:#ee9900">Yes</span>
</code></span></span>

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两个从库必须设置为只读模式

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">set</span> <span style="color:#ee9900">global</span> <span style="color:#ee9900">read_only</span><span style="color:#999999">=</span><span style="color:#98c379">1</span><span style="color:#999999">;</span>
</code></span></span>

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⑤主从复制验证

在这里插入图片描述

⑥安装 MHA 软件

所有服务器上都安装 MHA 依赖的环境，首先安装 epel 源

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">mv</span> <span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">yum</span><span style="color:#999999">.</span><span style="color:#ee9900">repos</span><span style="color:#999999">.</span><span style="color:#ee9900">d</span><span style="color:#999999">/</span><span style="color:#ee9900">repo</span><span style="color:#999999">.</span><span style="color:#ee9900">bak</span><span style="color:#999999">/</span><span style="color:#ee9900">CentOS-</span><span style="color:#999999">*</span> <span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">yum</span><span style="color:#999999">.</span><span style="color:#ee9900">repos</span><span style="color:#999999">.</span><span style="color:#ee9900">d</span><span style="color:#999999">/</span>
<span style="color:#ee9900">yum</span> <span style="color:#ee9900">list</span>
<span style="color:#ee9900">yum</span> <span style="color:#ee9900">install</span> <span style="color:#ee9900">epel-release</span> <span style="color:#ee9900">--nogpgcheck</span> <span style="color:#ee9900">-y</span>

<span style="color:#ee9900">yum</span> <span style="color:#ee9900">install</span> <span style="color:#ee9900">-y</span> <span style="color:#ee9900">perl-DBD-MySQL</span> <span style="color:#999999">\</span>
<span style="color:#ee9900">perl-Config-Tiny</span> <span style="color:#999999">\</span>
<span style="color:#ee9900">perl-Log-Dispatch</span> <span style="color:#999999">\</span>
<span style="color:#ee9900">perl-Parallel-ForkManager</span> <span style="color:#999999">\</span>
<span style="color:#ee9900">perl-ExtUtils-CBuilder</span> <span style="color:#999999">\</span>
<span style="color:#ee9900">perl-ExtUtils-MakeMaker</span> <span style="color:#999999">\</span>
<span style="color:#ee9900">perl-CPAN</span>
</code></span></span>

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安装 MHA 软件包，先在所有服务器上必须先安装 node 组件

对于每个操作系统版本不一样，这里 CentOS7.4 必须选择 0.57 版本。
在所有服务器上必须先安装 node 组件，最后在 MHA-manager 节点上安装 manager 组件，因为 manager 依赖 node 组件。

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">cd</span> <span style="color:#999999">/</span><span style="color:#ee9900">opt</span>               <span style="color:#999999">#</span><span style="color:#ee9900">将软件包mha4mysql-node-</span><span style="color:#98c379">0.57</span><span style="color:#999999">.</span><span style="color:#ee9900">tar</span><span style="color:#999999">.</span><span style="color:#ee9900">gz放入</span><span style="color:#999999">/</span><span style="color:#ee9900">opt目录下</span>

<span style="color:#ee9900">tar</span> <span style="color:#ee9900">zxvf</span> <span style="color:#ee9900">mha4mysql-node-</span><span style="color:#98c379">0.57</span><span style="color:#999999">.</span><span style="color:#ee9900">tar</span><span style="color:#999999">.</span><span style="color:#ee9900">gz</span>
<span style="color:#ee9900">cd</span> <span style="color:#ee9900">mha4mysql-node-</span><span style="color:#98c379">0.57</span>
<span style="color:#ee9900">perl</span> <span style="color:#ee9900">Makefile</span><span style="color:#999999">.</span><span style="color:#ee9900">PL</span>
<span style="color:#ee9900">make</span> <span style="color:#999999">&</span><span style="color:#999999">&</span> <span style="color:#ee9900">make</span> <span style="color:#ee9900">install</span>
</code></span></span>

在 MHA manager 节点上安装 manager 组件

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">cd</span> <span style="color:#999999">/</span><span style="color:#ee9900">opt</span>                           <span style="color:#999999">#</span><span style="color:#ee9900">将软件包mha4mysql-manager-</span><span style="color:#98c379">0.57</span><span style="color:#999999">.</span><span style="color:#ee9900">tar</span><span style="color:#999999">.</span><span style="color:#ee9900">gz放入</span><span style="color:#999999">/</span><span style="color:#ee9900">opt目录下</span>

<span style="color:#ee9900">tar</span> <span style="color:#ee9900">zxvf</span> <span style="color:#ee9900">mha4mysql-manager-</span><span style="color:#98c379">0.57</span><span style="color:#999999">.</span><span style="color:#ee9900">tar</span><span style="color:#999999">.</span><span style="color:#ee9900">gz</span>
<span style="color:#ee9900">cd</span> <span style="color:#ee9900">mha4mysql-manager-</span><span style="color:#98c379">0.57</span>
<span style="color:#ee9900">perl</span> <span style="color:#ee9900">Makefile</span><span style="color:#999999">.</span><span style="color:#ee9900">PL</span>
<span style="color:#ee9900">make</span> <span style="color:#999999">&</span><span style="color:#999999">&</span> <span style="color:#ee9900">make</span> <span style="color:#ee9900">install</span>
</code></span></span>

manager 组件安装后在/usr/local/bin 下面会生成几个工具，主要包括以下几个

masterha_check_ssh	检查 MHA 的 SSH 配置状况
masterha_check_repl	检查 MySQL 复制状况
masterha_manger	启动 manager的脚本
masterha_check_status	检测当前 MHA 运行状态
masterha_master_monitor	检测 master 是否宕机
masterha_master_switch	控制故障转移(自动或者手动)
masterha_conf_host	添加或删除配置的 server 信息
masterha_stop	关闭manager

node 组件安装后也会在/usr/local/bin 下面会生成几个脚本(这些工具通常由 MHAManager 的脚本触发，无需人为操作)主要如下

save_binary_logs	保存和复制 master 的二进制日志
apply_diff_relay_logs	识别差异的中继日志事件并将其差异的事件应用于其他的 slave
filter_mysqlbinlog	去除不必要的 ROLLBACK 事件(MHA 已不再使用这个工具)
purge_relay_logs	清除中继日志(不会阻塞 SQL 线程)

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⑦在所有服务器上配置无密码认证

在 manager 节点上配置到所有数据库节点的无密码认证

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">ssh-keygen</span> <span style="color:#ee9900">-t</span> <span style="color:#ee9900">rsa</span> 				<span style="color:#999999">#</span><span style="color:#ee9900">一路按回车键</span>
<span style="color:#ee9900">ssh-copy-id</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.60</span>
<span style="color:#ee9900">ssh-copy-id</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.50</span>
<span style="color:#ee9900">ssh-copy-id</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.40</span>
</code></span></span>

在这里插入图片描述

在 mysql1 上配置到数据库节点 mysql2 和 mysql3 的无密码认证

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">ssh-keygen</span> <span style="color:#ee9900">-t</span> <span style="color:#ee9900">rsa</span>
<span style="color:#ee9900">ssh-copy-id</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.50</span>
<span style="color:#ee9900">ssh-copy-id</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.40</span>
</code></span></span>

在这里插入图片描述
在 mysql2 上配置到数据库节点 mysql1 和 mysql3 的无密码认证

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">ssh-keygen</span> <span style="color:#ee9900">-t</span> <span style="color:#ee9900">rsa</span>
<span style="color:#ee9900">ssh-copy-id</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.60</span>
<span style="color:#ee9900">ssh-copy-id</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.40</span>
</code></span></span>

在 mysql3 上配置到数据库节点 mysql1 和 mysql2 的无密码认证

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">ssh-keygen</span> <span style="color:#ee9900">-t</span> <span style="color:#ee9900">rsa</span>
<span style="color:#ee9900">ssh-copy-id</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.60</span>
<span style="color:#ee9900">ssh-copy-id</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.50</span>
</code></span></span>

⑧在 manager 节点上配置 MHA

在 manager 节点上复制相关脚本到/usr/local/bin 目录

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">cp</span> <span style="color:#ee9900">-rp</span> <span style="color:#999999">/</span><span style="color:#ee9900">opt</span><span style="color:#999999">/</span><span style="color:#ee9900">mha4mysql-manager-</span><span style="color:#98c379">0.57</span><span style="color:#c678dd">/samples/scripts</span> <span style="color:#c678dd">/usr/local/bin</span>

<span style="color:#c678dd">#复制后会有四个执行文件</span>
<span style="color:#ee9900">ll</span> <span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">scripts</span><span style="color:#999999">/</span>
</code></span></span>

在这里插入图片描述

master_ip_failover	自动切换时 VIP 管理的脚本
master_ip_online_change	在线切换时 vip 的管理
power_manager	故障发生后关闭主机的脚本
send_report	因故障切换后发送报警的脚本

复制上述的自动切换时 VIP 管理的脚本到 /usr/local/bin 目录，这里使用master_ip_failover脚本来管理 VIP 和故障切换

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">cp</span> <span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">scripts</span><span style="color:#999999">/</span><span style="color:#ee9900">master_ip_failover</span> <span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span>
</code></span></span>

修改内容如下：(删除原有内容，直接复制并修改vip相关参数vip自定义)

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">echo</span> <span style="color:#669900">''</span> <span style="color:#999999">></span> <span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">master_ip_failover</span>     <span style="color:#999999">#</span><span style="color:#ee9900">清空配置文件的所有代码</span>

<span style="color:#ee9900">vim</span> <span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">master_ip_failover</span>
<span style="color:#999999">#</span><span style="color:#999999">!</span><span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">env</span> <span style="color:#ee9900">perl</span>
<span style="color:#ee9900">use</span> <span style="color:#ee9900">strict</span><span style="color:#999999">;</span>
<span style="color:#ee9900">use</span> <span style="color:#ee9900">warnings</span> <span style="color:#ee9900">FATAL</span> <span style="color:#999999">=</span><span style="color:#999999">></span> <span style="color:#669900">'all'</span><span style="color:#999999">;</span>

<span style="color:#ee9900">use</span> <span style="color:#ee9900">Getopt::Long</span><span style="color:#999999">;</span>

<span style="color:#ee9900">my</span> <span style="color:#999999">(</span>
<span style="color:#ee9900">$command</span><span style="color:#999999">,</span> <span style="color:#ee9900">$ssh_user</span><span style="color:#999999">,</span> <span style="color:#ee9900">$orig_master_host</span><span style="color:#999999">,</span> <span style="color:#ee9900">$orig_master_ip</span><span style="color:#999999">,</span>
<span style="color:#ee9900">$orig_master_port</span><span style="color:#999999">,</span> <span style="color:#ee9900">$new_master_host</span><span style="color:#999999">,</span> <span style="color:#ee9900">$new_master_ip</span><span style="color:#999999">,</span> <span style="color:#ee9900">$new_master_port</span>
<span style="color:#999999">)</span><span style="color:#999999">;</span>
<span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#ee9900">添加内容部分</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span>
<span style="color:#ee9900">my</span> <span style="color:#ee9900">$vip</span> <span style="color:#999999">=</span> <span style="color:#669900">'192.168.153.200'</span><span style="color:#999999">;</span>								<span style="color:#999999">#</span><span style="color:#ee9900">指定vip的地址</span>
<span style="color:#ee9900">my</span> <span style="color:#ee9900">$brdc</span> <span style="color:#999999">=</span> <span style="color:#669900">'192.168.153.255'</span><span style="color:#999999">;</span>								<span style="color:#999999">#</span><span style="color:#ee9900">指定vip的广播地址</span>
<span style="color:#ee9900">my</span> <span style="color:#ee9900">$ifdev</span> <span style="color:#999999">=</span> <span style="color:#669900">'ens33'</span><span style="color:#999999">;</span>										<span style="color:#999999">#</span><span style="color:#ee9900">指定vip绑定的网卡</span>
<span style="color:#ee9900">my</span> <span style="color:#ee9900">$key</span> <span style="color:#999999">=</span> <span style="color:#669900">'1'</span><span style="color:#999999">;</span>												<span style="color:#999999">#</span><span style="color:#ee9900">指定vip绑定的虚拟网卡序列号</span>
<span style="color:#ee9900">my</span> <span style="color:#ee9900">$ssh_start_vip</span> <span style="color:#999999">=</span> <span style="color:#669900">"/sbin/ifconfig ens33:$key $vip"</span><span style="color:#999999">;</span>		<span style="color:#999999">#</span><span style="color:#ee9900">代表此变量值为ifconfig</span> <span style="color:#ee9900">ens33:</span><span style="color:#98c379">1</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.200</span>
<span style="color:#ee9900">my</span> <span style="color:#ee9900">$ssh_stop_vip</span> <span style="color:#999999">=</span> <span style="color:#669900">"/sbin/ifconfig ens33:$key down"</span><span style="color:#999999">;</span>		<span style="color:#999999">#</span><span style="color:#ee9900">代表此变量值为ifconfig</span> <span style="color:#ee9900">ens33:</span><span style="color:#98c379">1</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.200</span> <span style="color:#ee9900">down</span>
<span style="color:#ee9900">my</span> <span style="color:#ee9900">$exit_code</span> <span style="color:#999999">=</span> <span style="color:#98c379">0</span><span style="color:#999999">;</span>											<span style="color:#999999">#</span><span style="color:#ee9900">指定退出状态码为</span><span style="color:#98c379">0</span>
<span style="color:#c678dd">#my</span> <span style="color:#ee9900">$ssh_start_vip</span> <span style="color:#999999">=</span> <span style="color:#669900">"/usr/sbin/ip addr add $vip/24 brd $brdc dev $ifdev label $ifdev:$key;/usr/sbin/arping -q -A -c 1 -I $ifdev $vip;iptables -F;"</span><span style="color:#999999">;</span>
<span style="color:#999999">#</span><span style="color:#ee9900">my</span> <span style="color:#ee9900">$ssh_stop_vip</span> <span style="color:#999999">=</span> <span style="color:#669900">"/usr/sbin/ip addr del $vip/24 dev $ifdev label $ifdev:$key"</span><span style="color:#999999">;</span>
<span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span><span style="color:#999999">#</span>
<span style="color:#ee9900">GetOptions</span><span style="color:#999999">(</span>
<span style="color:#669900">'command=s'</span> <span style="color:#999999">=</span><span style="color:#999999">></span> <span style="color:#999999">\</span><span style="color:#ee9900">$command</span><span style="color:#999999">,</span>
<span style="color:#669900">'ssh_user=s'</span> <span style="color:#999999">=</span><span style="color:#999999">></span> <span style="color:#999999">\</span><span style="color:#ee9900">$ssh_user</span><span style="color:#999999">,</span>
<span style="color:#669900">'orig_master_host=s'</span> <span style="color:#999999">=</span><span style="color:#999999">></span> <span style="color:#999999">\</span><span style="color:#ee9900">$orig_master_host</span><span style="color:#999999">,</span>
<span style="color:#669900">'orig_master_ip=s'</span> <span style="color:#999999">=</span><span style="color:#999999">></span> <span style="color:#999999">\</span><span style="color:#ee9900">$orig_master_ip</span><span style="color:#999999">,</span>
<span style="color:#669900">'orig_master_port=i'</span> <span style="color:#999999">=</span><span style="color:#999999">></span> <span style="color:#999999">\</span><span style="color:#ee9900">$orig_master_port</span><span style="color:#999999">,</span>
<span style="color:#669900">'new_master_host=s'</span> <span style="color:#999999">=</span><span style="color:#999999">></span> <span style="color:#999999">\</span><span style="color:#ee9900">$new_master_host</span><span style="color:#999999">,</span>
<span style="color:#669900">'new_master_ip=s'</span> <span style="color:#999999">=</span><span style="color:#999999">></span> <span style="color:#999999">\</span><span style="color:#ee9900">$new_master_ip</span><span style="color:#999999">,</span>
<span style="color:#669900">'new_master_port=i'</span> <span style="color:#999999">=</span><span style="color:#999999">></span> <span style="color:#999999">\</span><span style="color:#ee9900">$new_master_port</span><span style="color:#999999">,</span>
<span style="color:#999999">)</span><span style="color:#999999">;</span>

<span style="color:#ee9900">exit</span> <span style="color:#999999">&</span><span style="color:#ee9900">main</span><span style="color:#999999">(</span><span style="color:#999999">)</span><span style="color:#999999">;</span>

<span style="color:#ee9900">sub</span> <span style="color:#ee9900">main</span> <span style="color:#999999">{</span>

<span style="color:#ee9900">print</span> <span style="color:#669900">"\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n"</span><span style="color:#999999">;</span>

<span style="color:#ee9900">if</span> <span style="color:#999999">(</span> <span style="color:#ee9900">$command</span> <span style="color:#ee9900">eq</span> <span style="color:#669900">"stop"</span> <span style="color:#999999">|</span><span style="color:#999999">|</span> <span style="color:#ee9900">$command</span> <span style="color:#ee9900">eq</span> <span style="color:#669900">"stopssh"</span> <span style="color:#999999">)</span> <span style="color:#999999">{</span>

<span style="color:#ee9900">my</span> <span style="color:#ee9900">$exit_code</span> <span style="color:#999999">=</span> <span style="color:#98c379">1</span><span style="color:#999999">;</span>
<span style="color:#ee9900">eval</span> <span style="color:#999999">{</span>
<span style="color:#ee9900">print</span> <span style="color:#669900">"Disabling the VIP on old master: $orig_master_host \n"</span><span style="color:#999999">;</span>
<span style="color:#999999">&</span><span style="color:#ee9900">stop_vip</span><span style="color:#999999">(</span><span style="color:#999999">)</span><span style="color:#999999">;</span>
<span style="color:#ee9900">$exit_code</span> <span style="color:#999999">=</span> <span style="color:#98c379">0</span><span style="color:#999999">;</span>
<span style="color:#999999">}</span><span style="color:#999999">;</span>
<span style="color:#ee9900">if</span> <span style="color:#999999">(</span><span style="color:#ee9900">$</span><span style="color:#999999">@</span><span style="color:#999999">)</span> <span style="color:#999999">{</span>
<span style="color:#ee9900">warn</span> <span style="color:#669900">"Got Error: $@\n"</span><span style="color:#999999">;</span>
<span style="color:#ee9900">exit</span> <span style="color:#ee9900">$exit_code</span><span style="color:#999999">;</span>
<span style="color:#999999">}</span>
<span style="color:#ee9900">exit</span> <span style="color:#ee9900">$exit_code</span><span style="color:#999999">;</span>
<span style="color:#999999">}</span>
<span style="color:#ee9900">elsif</span> <span style="color:#999999">(</span> <span style="color:#ee9900">$command</span> <span style="color:#ee9900">eq</span> <span style="color:#669900">"start"</span> <span style="color:#999999">)</span> <span style="color:#999999">{</span>

<span style="color:#ee9900">my</span> <span style="color:#ee9900">$exit_code</span> <span style="color:#999999">=</span> <span style="color:#98c379">10</span><span style="color:#999999">;</span>
<span style="color:#ee9900">eval</span> <span style="color:#999999">{</span>
<span style="color:#ee9900">print</span> <span style="color:#669900">"Enabling the VIP - $vip on the new master - $new_master_host \n"</span><span style="color:#999999">;</span>
<span style="color:#999999">&</span><span style="color:#ee9900">start_vip</span><span style="color:#999999">(</span><span style="color:#999999">)</span><span style="color:#999999">;</span>
<span style="color:#ee9900">$exit_code</span> <span style="color:#999999">=</span> <span style="color:#98c379">0</span><span style="color:#999999">;</span>
<span style="color:#999999">}</span><span style="color:#999999">;</span>
<span style="color:#ee9900">if</span> <span style="color:#999999">(</span><span style="color:#ee9900">$</span><span style="color:#999999">@</span><span style="color:#999999">)</span> <span style="color:#999999">{</span>
<span style="color:#ee9900">warn</span> <span style="color:#ee9900">$</span><span style="color:#999999">@</span><span style="color:#999999">;</span>
<span style="color:#ee9900">exit</span> <span style="color:#ee9900">$exit_code</span><span style="color:#999999">;</span>
<span style="color:#999999">}</span>
<span style="color:#ee9900">exit</span> <span style="color:#ee9900">$exit_code</span><span style="color:#999999">;</span>
<span style="color:#999999">}</span>
<span style="color:#ee9900">elsif</span> <span style="color:#999999">(</span> <span style="color:#ee9900">$command</span> <span style="color:#ee9900">eq</span> <span style="color:#669900">"status"</span> <span style="color:#999999">)</span> <span style="color:#999999">{</span>
<span style="color:#ee9900">print</span> <span style="color:#669900">"Checking the Status of the script.. OK \n"</span><span style="color:#999999">;</span>
<span style="color:#ee9900">exit</span> <span style="color:#98c379">0</span><span style="color:#999999">;</span>
<span style="color:#999999">}</span>
<span style="color:#ee9900">else</span> <span style="color:#999999">{</span>
<span style="color:#999999">&</span><span style="color:#ee9900">usage</span><span style="color:#999999">(</span><span style="color:#999999">)</span><span style="color:#999999">;</span>
<span style="color:#ee9900">exit</span> <span style="color:#98c379">1</span><span style="color:#999999">;</span>
<span style="color:#999999">}</span>
<span style="color:#999999">}</span>
<span style="color:#ee9900">sub</span> <span style="color:#ee9900">start_vip</span><span style="color:#999999">(</span><span style="color:#999999">)</span> <span style="color:#999999">{</span>
<span style="color:#999999">`</span><span style="color:#ee9900">ssh</span> <span style="color:#ee9900">$ssh_user</span><span style="color:#999999">\</span><span style="color:#999999">@</span><span style="color:#ee9900">$new_master_host</span> <span style="color:#999999">\</span><span style="color:#999999">"</span> <span style="color:#ee9900">$ssh_start_vip</span> <span style="color:#999999">\</span><span style="color:#999999">"</span><span style="color:#999999">`</span><span style="color:#999999">;</span>
<span style="color:#999999">}</span>
<span style="color:#999999">#</span><span style="color:#999999">#</span> <span style="color:#ee9900">A</span> <span style="color:#ee9900">simple</span> <span style="color:#ee9900">system</span> <span style="color:#ee9900">call</span> <span style="color:#ee9900">that</span> <span style="color:#ee9900">disable</span> <span style="color:#ee9900">the</span> <span style="color:#ee9900">VIP</span> <span style="color:#ee9900">on</span> <span style="color:#ee9900">the</span> <span style="color:#ee9900">old_master</span>
<span style="color:#ee9900">sub</span> <span style="color:#ee9900">stop_vip</span><span style="color:#999999">(</span><span style="color:#999999">)</span> <span style="color:#999999">{</span>
<span style="color:#999999">`</span><span style="color:#ee9900">ssh</span> <span style="color:#ee9900">$ssh_user</span><span style="color:#999999">\</span><span style="color:#999999">@</span><span style="color:#ee9900">$orig_master_host</span> <span style="color:#999999">\</span><span style="color:#999999">"</span> <span style="color:#ee9900">$ssh_stop_vip</span> <span style="color:#999999">\</span><span style="color:#999999">"</span><span style="color:#999999">`</span><span style="color:#999999">;</span>
<span style="color:#999999">}</span>

<span style="color:#ee9900">sub</span> <span style="color:#ee9900">usage</span> <span style="color:#999999">{</span>
<span style="color:#ee9900">print</span>
<span style="color:#669900">"Usage: master_ip_failover --command=start|stop|stopssh|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n"</span><span style="color:#999999">;</span>
<span style="color:#999999">}</span>
</code></span></span>

创建 MHA 软件目录并拷贝配置文件，这里使用app1.cnf配置文件来管理 mysql 节点服务器

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">mkdir</span> <span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span>
<span style="color:#ee9900">cp</span> <span style="color:#999999">/</span><span style="color:#ee9900">opt</span><span style="color:#999999">/</span><span style="color:#ee9900">mha4mysql-manager-</span><span style="color:#98c379">0.57</span><span style="color:#c678dd">/samples/conf/app1.cnf</span> <span style="color:#c678dd">/etc/masterha</span>

<span style="color:#ee9900">echo</span> <span style="color:#669900">''</span> <span style="color:#999999">></span> <span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">.</span><span style="color:#ee9900">cnf</span>              <span style="color:#999999">#</span><span style="color:#ee9900">删除原有内容，直接复制并修改节点服务器的IP地址</span>
<span style="color:#ee9900">vim</span> <span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">.</span><span style="color:#ee9900">cnf</span>	
					
<span style="color:#999999">[</span><span style="color:#ee9900">server default</span><span style="color:#999999">]</span>
<span style="color:#ee9900">manager_log</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">var</span><span style="color:#999999">/</span><span style="color:#ee9900">log</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">/</span><span style="color:#ee9900">manager</span><span style="color:#999999">.</span><span style="color:#ee9900">log</span>
<span style="color:#ee9900">manager_workdir</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">var</span><span style="color:#999999">/</span><span style="color:#ee9900">log</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span>
<span style="color:#ee9900">master_binlog_dir</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">mysql</span><span style="color:#999999">/</span><span style="color:#ee9900">data</span>
<span style="color:#ee9900">master_ip_failover_script</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">master_ip_failover</span>
<span style="color:#ee9900">master_ip_online_change_script</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">master_ip_online_change</span>
<span style="color:#ee9900">password</span><span style="color:#999999">=</span><span style="color:#ee9900">manager</span>
<span style="color:#ee9900">ping_interval</span><span style="color:#999999">=</span><span style="color:#98c379">1</span>
<span style="color:#ee9900">remote_workdir</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">tmp</span>
<span style="color:#ee9900">repl_password</span><span style="color:#999999">=</span><span style="color:#98c379">123456</span>
<span style="color:#ee9900">repl_user</span><span style="color:#999999">=</span><span style="color:#ee9900">myslave</span>
<span style="color:#ee9900">secondary_check_script</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha_secondary_check</span> <span style="color:#ee9900">-s</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.50</span> <span style="color:#ee9900">-s</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.40</span>
<span style="color:#ee9900">shutdown_script</span><span style="color:#999999">=</span><span style="color:#669900">""</span>
<span style="color:#ee9900">ssh_user</span><span style="color:#999999">=</span><span style="color:#ee9900">root</span>
<span style="color:#ee9900">user</span><span style="color:#999999">=</span><span style="color:#ee9900">mha</span>

<span style="color:#999999">[</span><span style="color:#ee9900">server1</span><span style="color:#999999">]</span>
<span style="color:#ee9900">hostname</span><span style="color:#999999">=</span><span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.60</span>
<span style="color:#ee9900">port</span><span style="color:#999999">=</span><span style="color:#98c379">3306</span>

<span style="color:#999999">[</span><span style="color:#ee9900">server2</span><span style="color:#999999">]</span>
<span style="color:#ee9900">candidate_master</span><span style="color:#999999">=</span><span style="color:#98c379">1</span>
<span style="color:#ee9900">check_repl_delay</span><span style="color:#999999">=</span><span style="color:#98c379">0</span>
<span style="color:#ee9900">hostname</span><span style="color:#999999">=</span><span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.50</span>
<span style="color:#ee9900">port</span><span style="color:#999999">=</span><span style="color:#98c379">3306</span>

<span style="color:#999999">[</span><span style="color:#ee9900">server3</span><span style="color:#999999">]</span>
<span style="color:#ee9900">hostname</span><span style="color:#999999">=</span><span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.40</span>
<span style="color:#ee9900">port</span><span style="color:#999999">=</span><span style="color:#98c379">3306</span>
</code></span></span>

在这里插入图片描述

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#999999">[</span><span style="color:#ee9900">server default</span><span style="color:#999999">]</span>
<span style="color:#ee9900">manager_log</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">var</span><span style="color:#999999">/</span><span style="color:#ee9900">log</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">/</span><span style="color:#ee9900">manager</span><span style="color:#999999">.</span><span style="color:#ee9900">log</span>　　　　　　<span style="color:#999999">#</span><span style="color:#ee9900">manager日志</span>
<span style="color:#ee9900">manager_workdir</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">var</span><span style="color:#999999">/</span><span style="color:#ee9900">log</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">.</span><span style="color:#ee9900">log</span>　　　　　　 　　<span style="color:#999999">#</span><span style="color:#ee9900">manager工作目录</span>
<span style="color:#ee9900">master_binlog_dir</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">mysql</span><span style="color:#999999">/</span><span style="color:#ee9900">data</span><span style="color:#999999">/</span>　　　　　　　   　<span style="color:#999999">#</span><span style="color:#ee9900">master保存binlog的位置，这里的路径要与master里配置的binlog的路径一致，以便MHA能找到</span>
<span style="color:#ee9900">master_ip_failover_script</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">master_ip_failover</span>　　<span style="color:#999999">#</span><span style="color:#ee9900">设置自动failover时候的切换脚本，也就是上面的那个脚本</span>
<span style="color:#ee9900">master_ip_online_change_script</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">master_ip_online_change</span>　　<span style="color:#999999">#</span><span style="color:#ee9900">设置手动切换时候的切换脚本</span>
<span style="color:#ee9900">password</span><span style="color:#999999">=</span><span style="color:#ee9900">manager</span>			<span style="color:#999999">#</span><span style="color:#ee9900">设置mysql中root用户的密码，这个密码是前文中创建监控用户的那个密码</span>
<span style="color:#ee9900">ping_interval</span><span style="color:#999999">=</span><span style="color:#98c379">1</span>				<span style="color:#c678dd">#设置监控主库，发送ping包的时间间隔，默认是</span><span style="color:#98c379">3</span><span style="color:#ee9900">秒，尝试三次没有回应的时候自动进行failover</span>
<span style="color:#ee9900">remote_workdir</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">tmp</span>			<span style="color:#999999">#</span><span style="color:#ee9900">设置远端mysql在发生切换时binlog的保存位置</span>
<span style="color:#ee9900">repl_password</span><span style="color:#999999">=</span><span style="color:#98c379">123456</span>    	<span style="color:#c678dd">#设置复制用户的密码</span>
<span style="color:#ee9900">repl_user</span><span style="color:#999999">=</span><span style="color:#ee9900">myslave</span>			<span style="color:#999999">#</span><span style="color:#ee9900">设置复制用户的用户</span>
<span style="color:#ee9900">report_script</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">send_report</span>　　　　　<span style="color:#999999">#</span><span style="color:#ee9900">设置发生切换后发送的报警的脚本</span>
<span style="color:#ee9900">secondary_check_script</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha_secondary_check</span> <span style="color:#ee9900">-s</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.50</span> <span style="color:#ee9900">-s</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.40</span>	<span style="color:#c678dd">#指定检查的从服务器IP地址</span>
<span style="color:#ee9900">shutdown_script</span><span style="color:#999999">=</span><span style="color:#669900">""</span>			<span style="color:#c678dd">#设置故障发生后关闭故障主机脚本(该脚本的主要作用是关闭主机防止发生脑裂,这里没有使用)</span>
<span style="color:#ee9900">ssh_user</span><span style="color:#999999">=</span><span style="color:#ee9900">root</span>				<span style="color:#999999">#</span><span style="color:#ee9900">设置ssh的登录用户名</span>
<span style="color:#ee9900">user</span><span style="color:#999999">=</span><span style="color:#ee9900">mha</span>					<span style="color:#999999">#</span><span style="color:#ee9900">设置监控用户root</span>

<span style="color:#999999">[</span><span style="color:#ee9900">server1</span><span style="color:#999999">]</span>
<span style="color:#ee9900">hostname</span><span style="color:#999999">=</span><span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.60</span>
<span style="color:#ee9900">port</span><span style="color:#999999">=</span><span style="color:#98c379">3306</span>

<span style="color:#999999">[</span><span style="color:#ee9900">server2</span><span style="color:#999999">]</span>
<span style="color:#ee9900">hostname</span><span style="color:#999999">=</span><span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.50</span>
<span style="color:#ee9900">port</span><span style="color:#999999">=</span><span style="color:#98c379">3306</span>
<span style="color:#ee9900">candidate_master</span><span style="color:#999999">=</span><span style="color:#98c379">1</span>
<span style="color:#c678dd">#设置为候选master，设置该参数以后，发生主从切换以后将会将此从库提升为主库，即使这个主库不是集群中最新的slave</span>

<span style="color:#ee9900">check_repl_delay</span><span style="color:#999999">=</span><span style="color:#98c379">0</span>
<span style="color:#c678dd">#默认情况下如果一个slave落后master</span> <span style="color:#ee9900">超过</span><span style="color:#98c379">100</span><span style="color:#ee9900">M的relay</span> <span style="color:#ee9900">logs的话，MHA将不会选择该slave作为一个新的master，</span> <span style="color:#ee9900">因为对于这个slave的恢复需要花费很长时间；通过设置check_repl_delay</span><span style="color:#999999">=</span><span style="color:#98c379">0</span><span style="color:#ee9900">，MHA触发切换在选择一个新的master的时候将会忽略复制延时，这个参数对于设置了candidate_master</span><span style="color:#999999">=</span><span style="color:#98c379">1</span><span style="color:#ee9900">的主机非常有用，因为这个候选主在切换的过程中一定是新的master</span>

<span style="color:#999999">[</span><span style="color:#ee9900">server3</span><span style="color:#999999">]</span>
<span style="color:#ee9900">hostname</span><span style="color:#999999">=</span><span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.40</span>
<span style="color:#ee9900">port</span><span style="color:#999999">=</span><span style="color:#98c379">3306</span>
</code></span></span>

第一次配置需要在 Master 节点上手动开启虚拟IP

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#c678dd">/sbin/ifconfig</span> <span style="color:#ee9900">ens33:</span><span style="color:#98c379">1</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.200</span><span style="color:#999999">/</span><span style="color:#98c379">24</span>
</code></span></span>

在这里插入图片描述

在 manager 节点上测试 ssh 无密码认证，如果正常最后会输出 successfully，如下所示

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">masterha_check_ssh</span> <span style="color:#ee9900">-conf</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">.</span><span style="color:#ee9900">cnf</span>
</code></span></span>

在这里插入图片描述
此处如果报错一般是密码对那一步有问题
在 manager 节点上测试 mysql 主从连接情况，最后出现 MySQL Replication Health is OK 字样说明正常

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">masterha_check_repl</span> <span style="color:#ee9900">-conf</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">.</span><span style="color:#ee9900">cnf</span>
</code></span></span>

在这里插入图片描述

在 manager 节点上启动 MHA

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">nohup</span> <span style="color:#ee9900">masterha_manager</span> <span style="color:#ee9900">--conf</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">.</span><span style="color:#ee9900">cnf</span> <span style="color:#ee9900">--remove_dead_master_conf</span> <span style="color:#ee9900">--ignore_last_failover</span> <span style="color:#999999"><</span> <span style="color:#999999">/</span><span style="color:#ee9900">dev</span><span style="color:#999999">/</span><span style="color:#ee9900">null</span> <span style="color:#999999">></span> <span style="color:#999999">/</span><span style="color:#ee9900">var</span><span style="color:#999999">/</span><span style="color:#ee9900">log</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">/</span><span style="color:#ee9900">manager</span><span style="color:#999999">.</span><span style="color:#ee9900">log</span> <span style="color:#98c379">2</span><span style="color:#999999">></span><span style="color:#999999">&</span><span style="color:#98c379">1</span> <span style="color:#999999">&</span>
</code></span></span>

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–remove_dead_master_conf：该参数代表当发生主从切换后，老的主库的 ip 将会从配置文件中移除。
–manger_log：日志存放位置。
–ignore_last_failover：在缺省情况下，如果 MHA 检测到连续发生宕机，且两次宕机间隔不足 8 小时的话，则不会进行 Failover，之所以这样限制是为了避免 ping-pong 效应。该参数代表忽略上次 MHA 触发切换产生的文件，默认情况下，MHA 发生切换后会在日志记目录，也就是上面设置的日志app1.failover.complete文件，下次再次切换的时候如果发现该目录下存在该文件将不允许触发切换，除非在第一次切换后收到删除该文件，为了方便，这里设置为–ignore_last_failover。

查看 MHA 状态，可以看到当前的 master 是 Mysql1 节点。

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">masterha_check_status</span> <span style="color:#ee9900">--conf</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">.</span><span style="color:#ee9900">cnf</span>
</code></span></span>

查看 MHA 日志，也以看到当前的 master 是 192.168.153.60，如下所示。

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">cat</span> <span style="color:#999999">/</span><span style="color:#ee9900">var</span><span style="color:#999999">/</span><span style="color:#ee9900">log</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">/</span><span style="color:#ee9900">manager</span><span style="color:#999999">.</span><span style="color:#ee9900">log</span> <span style="color:#999999">|</span> <span style="color:#ee9900">grep</span> <span style="color:#669900">"current master"</span>
</code></span></span>

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查看 Mysql1 的 VIP 地址 192.168.153.200 是否存在，这个 VIP 地址不会因为 manager 节点停止 MHA 服务而消失。

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">ifconfig</span>
</code></span></span>

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若要关闭 manager 服务，可以使用如下命令,或者可以直接采用 kill 进程 ID 的方式关闭

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">masterha_stop</span> <span style="color:#ee9900">--conf</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">.</span><span style="color:#ee9900">cnf</span>
</code></span></span>

⑨故障模拟

在 manager 节点上监控观察日志记录

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">tail</span> <span style="color:#ee9900">-f</span> <span style="color:#999999">/</span><span style="color:#ee9900">var</span><span style="color:#999999">/</span><span style="color:#ee9900">log</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">/</span><span style="color:#ee9900">manager</span><span style="color:#999999">.</span><span style="color:#ee9900">log</span>
</code></span></span>

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在 Master 节点 Mysql1 上停止mysql服务

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">systemctl</span> <span style="color:#ee9900">stop</span> <span style="color:#ee9900">mysqld</span>   <span style="color:#ee9900">或</span>    <span style="color:#ee9900">pkill</span> <span style="color:#ee9900">-</span><span style="color:#98c379">9</span> <span style="color:#ee9900">mysql</span>
</code></span></span>

正常自动切换一次后，MHA 进程会退出。HMA 会自动修改 app1.cnf 文件内容，将宕机的 mysql1 节点删除。查看 mysql2 是否接管 VIP

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">ifconfig</span>
</code></span></span>

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查看manager节点动态日志

故障切换备选主库的算法
1．一般判断从库的是从(position/GTID)判断优劣，数据有差异，最接近于master的slave，成为备选主。
2．数据一致的情况下，按照配置文件顺序，选择备选主库。
3．设定有权重(candidate_master=1)，按照权重强制指定备选主。
(1)默认情况下如果一个slave落后master 100M的relay logs的话，即使有权重，也会失效。
(2)如果check_repl_delay=0的话，即使落后很多日志，也强制选择其为备选主。

⑩故障修复

修复mysql

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">systemctl</span> <span style="color:#ee9900">restart</span> <span style="color:#ee9900">mysqld</span>
</code></span></span>

修复主从，在现主库服务器 Mysql2(192.168.153.50) 查看二进制文件和同步点

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">show</span> <span style="color:#ee9900">master</span> <span style="color:#ee9900">status</span><span style="color:#999999">;</span>
</code></span></span>

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在原主库服务器 mysql1 执行同步操作

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">change</span> <span style="color:#ee9900">master</span> <span style="color:#ee9900">to</span> <span style="color:#ee9900">master_host</span><span style="color:#999999">=</span><span style="color:#669900">'192.168.153.50'</span><span style="color:#999999">,</span><span style="color:#ee9900">master_user</span><span style="color:#999999">=</span><span style="color:#669900">'myslave'</span><span style="color:#999999">,</span><span style="color:#ee9900">master_password</span><span style="color:#999999">=</span><span style="color:#669900">'123456'</span><span style="color:#999999">,</span><span style="color:#ee9900">master_log_file</span><span style="color:#999999">=</span><span style="color:#669900">'master-bin.000001'</span><span style="color:#999999">,</span><span style="color:#ee9900">master_log_pos</span><span style="color:#999999">=</span><span style="color:#98c379">4933</span><span style="color:#999999">;</span>

<span style="color:#ee9900">start</span> <span style="color:#ee9900">slave</span><span style="color:#999999">;</span>

<span style="color:#ee9900">show</span> <span style="color:#ee9900">slave</span> <span style="color:#ee9900">status</span><span style="color:#999999">\</span><span style="color:#ee9900">G</span><span style="color:#999999">;</span>
</code></span></span>

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在 manager 节点上修改配置文件app1.cnf(再把这个记录添加进去，因为它检测掉失效时候会自动消失)

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">vim</span> <span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">.</span><span style="color:#ee9900">cnf</span>
<span style="color:#999999">.</span><span style="color:#999999">.</span><span style="color:#999999">.</span><span style="color:#999999">.</span><span style="color:#999999">.</span><span style="color:#999999">.</span>
<span style="color:#ee9900">secondary_check_script</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">usr</span><span style="color:#999999">/</span><span style="color:#ee9900">local</span><span style="color:#999999">/</span><span style="color:#ee9900">bin</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha_secondary_check</span> <span style="color:#ee9900">-s</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.60</span> <span style="color:#ee9900">-s</span> <span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.40</span>
<span style="color:#999999">.</span><span style="color:#999999">.</span><span style="color:#999999">.</span><span style="color:#999999">.</span><span style="color:#999999">.</span><span style="color:#999999">.</span>
<span style="color:#999999">[</span><span style="color:#ee9900">server1</span><span style="color:#999999">]</span>
<span style="color:#ee9900">hostname</span><span style="color:#999999">=</span><span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.50</span>
<span style="color:#ee9900">port</span><span style="color:#999999">=</span><span style="color:#98c379">3306</span>

<span style="color:#999999">[</span><span style="color:#ee9900">server2</span><span style="color:#999999">]</span>
<span style="color:#ee9900">candidate_master</span><span style="color:#999999">=</span><span style="color:#98c379">1</span>
<span style="color:#ee9900">check_repl_delay</span><span style="color:#999999">=</span><span style="color:#98c379">0</span>
<span style="color:#ee9900">hostname</span><span style="color:#999999">=</span><span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.60</span>
<span style="color:#ee9900">port</span><span style="color:#999999">=</span><span style="color:#98c379">3306</span>

<span style="color:#999999">[</span><span style="color:#ee9900">server3</span><span style="color:#999999">]</span>
<span style="color:#ee9900">hostname</span><span style="color:#999999">=</span><span style="color:#98c379">192.168</span><span style="color:#98c379">.153</span><span style="color:#98c379">.40</span>
<span style="color:#ee9900">port</span><span style="color:#999999">=</span><span style="color:#98c379">3306</span>
</code></span></span>

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在 manager 节点上启动 MHA

<span style="color:#000000"><span style="background-color:#282c34"><code class="language-handlebars"><span style="color:#ee9900">masterha_stop</span> <span style="color:#ee9900">--conf</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">.</span><span style="color:#ee9900">cnf</span>

<span style="color:#ee9900">nohup</span> <span style="color:#ee9900">masterha_manager</span> <span style="color:#ee9900">--conf</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">.</span><span style="color:#ee9900">cnf</span> <span style="color:#ee9900">--remove_dead_master_conf</span> <span style="color:#ee9900">--ignore_last_failover</span> <span style="color:#999999"><</span> <span style="color:#999999">/</span><span style="color:#ee9900">dev</span><span style="color:#999999">/</span><span style="color:#ee9900">null</span> <span style="color:#999999">></span> <span style="color:#999999">/</span><span style="color:#ee9900">var</span><span style="color:#999999">/</span><span style="color:#ee9900">log</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">/</span><span style="color:#ee9900">manager</span><span style="color:#999999">.</span><span style="color:#ee9900">log</span> <span style="color:#98c379">2</span><span style="color:#999999">></span><span style="color:#999999">&</span><span style="color:#98c379">1</span> <span style="color:#999999">&</span>

<span style="color:#ee9900">masterha_check_status</span> <span style="color:#ee9900">--conf</span><span style="color:#999999">=</span><span style="color:#999999">/</span><span style="color:#ee9900">etc</span><span style="color:#999999">/</span><span style="color:#ee9900">masterha</span><span style="color:#999999">/</span><span style="color:#ee9900">app1</span><span style="color:#999999">.</span><span style="color:#ee9900">cnf</span></code></span></span>