实战案例：实现Keepalived 状态切换的通知脚本

#在所有keepalived节点配置如下
[root@ka1-centos8 ~]#cat /etc/keepalived/notify.sh 
#!/bin/bash
#
contact='root@wangxiaochun.com'
notify() {
    mailsubject="$(hostname) to be $1, vip floating"
    mailbody="$(date +'%F %T'): vrrp transition, $(hostname) changed to be $1"
    echo "$mailbody" | mail -s "$mailsubject" $contact
}
case $1 in
master)
    notify master
    ;;
backup)
    notify backup
    ;;
fault)
    notify fault
    ;;
*)
    echo "Usage: $(basename $0) {master|backup|fault}"
    exit 1
    ;;
esac

[root@ka1-centos8 ~]#chmod a+x /etc/keepalived/notify.sh 

[root@ka1-centos8 ~]#vim /etc/keepalived/keepalived.conf
vrrp_instance VI_1 {
    ......
    virtual_ipaddress {
    10.0.0.10 dev eth0 label eth0:1
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}

#模拟master故障
[root@ka1-centos8 ~]#killall keepalived

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