centos安装 keepalived

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最新推荐文章于 2025-04-18 15:30:05 发布

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centos安装 keepalived

keepalived包的下载地址

keepalived包的下载地址：http://www.keepalived.org/software/keepalived-2.2.4.tar.gz
不同版本https://www.keepalived.org/download.html

集成系统服务（两个节点都执行）

上传keepalive包到/usr/local/src/下，安装依赖包，解压缩软件包，编译，安装
安装依赖包 yum install -y openssl-devel gcc
进入目录解压缩 cd /usr/local/src/ tar -zxvf keepalived-2.2.4.tar.gz
进入目录，编译，安装 cd keepalived-2.2.4
./configure --prefix=/usr/local/keepalived
make && make install

cp /usr/local/src/keepalived-2.2.4/keepalived/etc/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
mkdir -p /etc/keepalived/
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/keepalived/sbin/keepalived /usr/local/sbin/
echo “/etc/init.d/keepalived start” >> /etc/rc.local

配置keepaived服务

备份原有的conf文件
cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
vi /etc/keepalived/keepalived.conf #删除配置文件中的所有内容
加入以下内容并授权744 文件权限777会报错

! Configuration File for keepalived
       
global_defs {
notification_email {
dzp@126.com   #邮箱随便写，这里没配置发送邮件
}
       
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1 
smtp_connect_timeout 30
router_id MASTER-HA
}
       
vrrp_script chk_mysql_port {     #检测mysql服务是否在运行。有很多方式，比如进程，用脚本检测等等
    script "/opt/chk_mysql.sh"   #这里通过脚本监测
    interval 2                   #脚本执行间隔，每2s检测一次
    weight -5                    #脚本结果导致的优先级变更，检测失败（脚本返回非0）则优先级 -5
    fall 2                    #检测连续2次失败才算确定是真失败。会用weight减少优先级（1-255之间）
    rise 1                    #检测1次成功就算成功。但不修改优先级
}
       
vrrp_instance VI_1 {
# state MASTER        
    state BACKUP     
    nopreempt    #非抢占模式
    interface ens192      #指定虚拟ip的网卡接口, 通过ifconfig查看以确定
    mcast_src_ip 192.168.100.67 #每个节点对应的服务器ip  节点2使用192.168.100.60
    virtual_router_id 51    #路由器标识，MASTER和BACKUP必须是一致的
    priority 101            #定义优先级，数字越大，优先级越高，在同一个vrrp_instance下，MASTER的优先级必须大于BACKUP的优先级  节点2使用100
    advert_int 1         
    authentication {   
        auth_type PASS 
        auth_pass 1111     
    }
    virtual_ipaddress {    
        192.168.100.146  #vip-ip  每个节点的ip都写此值
    }
      
track_script {               
   chk_mysql_port             
}
}

编写检测脚本

KeepAlived做心跳检测，如果Master的MySQL服务挂了(3306端口挂了),那么它就会选择自杀。Slave的KeepAlived通过心跳检测发现这个情况，就会将VIP的请求接管
mysql使用： vi /opt/chk_mysql.sh

#!/bin/bash
counter=$(netstat -na|grep "LISTEN"|grep "3306"|wc -l)
if [ "${counter}" -eq 0 ]; then
    /etc/init.d/keepalived stop
fi

ngix使用：vi check_nginx_.sh

#!/bin/bash
 
A=`ps -C nginx --no-header |wc -l`
#判断nginx是否宕机，如果宕机了，尝试重启
if [ $A -eq 0 ];then
        # nginx的启动目录
        /usr/local/nginx/sbin/nginx
        # 等待3秒再次检查nginx，如果没有重启成功，则停止keepalived，使其启动备用机
        sleep 3
        if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
                service keepalived stop
        fi
fi

给脚本添加执行权限: chmod 744 /opt/chk_mysql.sh
启动keepalived服务 systemctl start keepalived
检查keepalived的状态 systemctl status keepalived
停止keepalived服务 systemctl stop keepalived
至此连接vip即可，vip可以对外提供服务了。