基于mysql主主互备实现keepalived高可用 方案

keepalived安装与配置

安装包获取：https://www.keepalived.org

二进制安装：

# 同步时钟源
# yum -y install ntp ntpdate
# ntpdate cn.pool.ntp.org
# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)
#获取安装包
[[e-mail] ~]# ls
keepalived-2.0.20.tar.gz
[[e-mail] ~]# tar xzf keepalived-2.0.20.tar.gz -C /usr/local/src/
# 配置编译环境
# yum install openssl-devel gcc gcc-c++ make
# 创建安装目录
# mkdir -p /data/keepalived
# cd /usr/local/src/keepalived-2.0.20/
# ./configure --prefix=/data/keepalived
# echo $?
0
# make
# echo $?
0
# make install
# echo $?
0

配置规范启动

# cd /usr/local/src/keepalived-2.0.20/keepalived/etc/
# cp -R init /data/keepalived/
# cp -R init /data/keepalived/etc/
# cp -R init.d /data/keepalived/etc/
# ll /data/keepalived/etc/
总用量 0
drwxr-xr-x. 2 root root  86 7月  31 21:58 init
drwxr-xr-x. 2 root root 135 7月  31 21:58 init.d
drwxr-xr-x. 3 root root  44 7月  31 18:01 keepalived
drwxr-xr-x. 2 root root  24 7月  31 17:59 sysconfig

修改配置文件

cp -p /etc/keepalived/keepalived.conf{,.bak}
#mysql01端
! Configuration File for keepalived

global_defs {
   notification_email {
     [e-mail]
     [e-mail]
     [e-mail]
   }
   notification_email_from [e-mail]
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id HA_MYSQL01
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}
vrrp_script check_mysqld {
    script "/etc/keepalived/check_mysqld.sh"
    interval 2
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.10.201
    }

    track_script {
        check_mysqld
    }
}

# mysql02端
! Configuration File for keepalived

global_defs {
   notification_email {
     [e-mail]
     [e-mail]
     [e-mail]
   }
   notification_email_from [e-mail]
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id HA_MYSQL01
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_script check_mysqld {
    script "/etc/keepalived/check_mysqld.sh"
    interval 2
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.10.201
    }

    track_script {
        check_mysqld
    }
}

验证

两端都开启keepalived —> systemctl start keepalived

mysql01端停止keepalived

注意

mysql01端恢复后ip又漂移到mysql01端上
故虽然此时能够完成故障的切换，但数据库的应用场景上不建议频繁的切换，因此将其配置为vip不抢占模式，具体配置如下
只需修改mysql01端的配置文件如下：

! Configuration File for keepalived

global_defs {
   notification_email {
     [e-mail]
     [e-mail]
     [e-mail]
   }
   notification_email_from [e-mail]
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id HA_MYSQL01
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_script check_mysqld {
    script "/etc/keepalived/check_mysqld.sh"
    interval 2
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 50
    advert_int 1
    nopreempt   #添加此选项，不抢占模式
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.10.201
    }

    track_script {
        check_mysqld
    }
}

此时重启mysql01端keepalived服务

相当于故障了，并随之恢复；此时ip漂移到mysql02端且不会漂移回mysql01

此时我们将mysql02端服务停掉，ip漂移到mysql01

用master主机测试

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