Keepalived高可用配置

yum -y install keepalived

rpm -ivh psmisc-22.20-17.el7.x86_64.rpm --force --nodeps --replacepkgs
rpm -ivh libnl3-3.2.28-4.el7.x86_64.rpm --force --nodeps --replacepkgs
rpm -ivh net-snmp-libs-5.7.2-49.el7_9.4.x86_64.rpm --force --nodeps --replacepkgs
rpm -ivh net-snmp-agent-libs-5.7.2-49.el7_9.4.x86_64.rpm --force --nodeps --replacepkgs
rpm -ivh lm_sensors-libs-3.4.0-8.20160601gitf9185e5.el7_9.1.x86_64.rpm --force --nodeps --replacepkgs
rpm -ivh perl-libs-5.16.3-299.el7_9.x86_64.rpm --force --nodeps --replacepkgs
rpm -ivh keepalived-1.3.5-19.el7.x86_64.rpm --force --nodeps --replacepkgs

! Configuration File for keepalived

global_defs {
    vrrp_skip_check_adv_addr
}

vrrp_script check_Mysqld {
    script "killall -0 mysqld"
    interval 2
    fall 2
    weight -20
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens192
    virtual_router_id 66
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass Aa123456
    }
    virtual_ipaddress {
        192.168.7.58
    }
    
    #当实例变为主服务器时，会执行指定的脚本 /etc/keepalived/notify_action.sh，并将参数 MASTER 传递给该脚本
    #notify_master "/etc/keepalived/notify_action.sh MASTER"  

    #当实例从主服务器状态切换到备用服务器状态时，会执行同样的脚本，但这次传递的参数是 BACKUP
    #notify_backup "/etc/keepalived/notify_action.sh BACKUP"

    #当检测到故障（例如，主服务器无法访问），它会执行该脚本，并将参数 FAULT 传递给脚本
    #notify_fault "/etc/keepalived/notify_action.sh FAULT"

    #当服务停止时，会执行该脚本，并将参数 STOP 传递给脚本
    #notify_stop "/etc/keepalived/notify_action.sh STOP"
    
    track_script {
        check_Mysqld
    }
}