nginx+keepalived集群高可用详细部署，keepalived安装启动报错问题(超详细)

本文链接：https://blog.youkuaiyun.com/weixin_43168010/article/details/108519094

本文详述了在 CentOS 系统中利用 nginx 和 keepalived 构建高可用集群的过程，包括环境准备、keepalived 安装、配置文件解析以及常见问题排查。通过设置，确保了在 master 服务器故障时，slave 服务器能无缝接管服务。

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因为最近在搭建公司的高可用集群服务器，可以看看前两天写的Mysql8.0主从同步,主从复制详解(超详细)和centos7安装mysql8详细介绍(超详细)

一：环境准备

master服务器ip地址：172.16.21.237

slave服务器ip地址：172.16.21.238

两台机器分别安装nginx和keepalived，237作为master，238作为slave，

二：keepalived安装

nginx的安装就不再这里介绍了，很简单。

2.1 方法一：yum方式

1、yum安装

安装依赖包
[root@localhost ~]# yum install -y curl gcc openssl-devel libnl3-devel net-snmp-devel
[root@localhost ~]# yum install -y keepalived

2、初始化及启动


[root@localhost ~]# systemctl start keepalived   //启动keepalived
[root@localhost ~]# systemctl enable keepalived  //加入开机启动keepalived
[root@localhost ~]# systemctl restart keepalived  //重新启动keepalived
[root@localhost ~]# systemctl status keepalived   //查看keepalived状态

2.2方法二、源码包

1、官网下载keepalived的最新版本，解压并安装

[root@master src]# pwd
/usr/local/src
[root@master src]# wget http://www.keepalived.org/software/keepalived-2.0.7.tar.gz
[root@master src]# tar xvf keepalived-2.0.7.tar.gz
[root@master src]# cd keepalived-2.0.7
[root@master keepalived-2.0.7]# ./configure --prefix=/usr/local/keepalived
[root@master keepalived-2.0.7]# make && make install

安装完成后会在以下路径生成

/usr/local/keepalived/etc/keepalived/keepalived.conf
/usr/local/keepalived/etc/sysconfig/keepalived
/usr/local/keepalived/etc/sbin/keepalived

2、初始化及启动

# keepalived启动脚本变量引用文件，默认文件路径是/etc/sysconfig/，也可以不做软链接，直接修改启动脚本中文件路径即可（安装目录下）
[root@localhost /]# cp /usr/local/keepalived/etc/sysconfig/keepalived  /etc/sysconfig/keepalived 
 
# 将keepalived主程序加入到环境变量（安装目录下）
[root@localhost /]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/keepalived
 
# keepalived启动脚本（源码目录下，就是解压后的文件位置），放到/etc/init.d/目录下就可以使用service命令便捷调用
[root@localhost /]#