mysql主从双机keepalived配置

1.关闭selinux

SELINUX=disabled

2.yum安装keepalived

yum install -y keepalived

3.修改配置文件

主库配置文件：

! Configuration File for keepalived

global_defs {

    notification_email {
        lr@isadba.com
    }
    notification_email_from lvs@isadba.com
    smtp_server 127.0.0.1
    smtp_connect_timeout 30
    router_id mysql01

    ! lvs_sync_daemon eth0 VI_1 1
}

vrrp_instance VI_1 {

    state master
    priority 150
    nopreempt

    virtual_router_id 241

    interface eno16777728

    advert_int 1

    ! smtp_alert

    authentication {
        auth_type PASS
        auth_pass 1111
    }

    virtual_ipaddress {
        192.168.12.4
    }
}

virtual_server 192.168.12.4 3306 {

    delay_loop 6
    lb_algo wlc
    lb_kind TUN
    protocol TCP

    real_server 192.168.12.60 3306 {
        weight 1
        notify_down /mysql/killkeepalived.sh
        TCP_CHECK {
            connect_port    3306
            connect_timeout 3
        }
    }

    real_server 192.168.12.2 3306 {
        weight 1
        TCP_CHECK {
            connect_port    3306
            connect_timeout 3
        }
    }
}

 

从库配置文件：

! Configuration File for keepalived

global_defs {

    notification_email {
        lr@isadba.com
    }
    notification_email_from lvs@isadba.com
    smtp_server 127.0.0.1
    smtp_connect_timeout 30
    router_id mysql02

    ! lvs_sync_daemon eth0 VI_1 1
}

vrrp_instance VI_1 {

    state backup
    priority 100
    nopreempt

    virtual_router_id 241

    interface eno16777728

    advert_int 1

    ! smtp_alert

    authentication {
        auth_type PASS
        auth_pass 1111
    }

    virtual_ipaddress {
        192.168.12.4
    }
}

virtual_server 192.168.12.4 3306 {

    delay_loop 6
    lb_algo wlc
    lb_kind TUN
    protocol TCP

    real_server 192.168.12.60 3306 {
        weight 1
        TCP_CHECK {
            connect_port    3306
            connect_timeout 3
        }
    }

    real_server 192.168.12.2 3306 {
        weight 1
        TCP_CHECK {
            connect_port    3306
            connect_timeout 3
        }
    }

}

 

主库脚本/mysql/killkeepalived.sh

#!/bin/sh
systemctl stop keepalived

 

4.主从切换过程

　　1.主库停库

　　2.keepalived执行关闭keepalived脚本

　　3.恢复主库，启动主库keepalived，关闭备库keepalived，vip即可回到主库。

 

5.扩展

 如果使用keepalived+mycat搭建主从+多个只读从库，将vip写入mycat配置schema.xml文件，业务使用vip连接数据库。