VRRP笔记二:配置keepalived为实现haproxy高可用的配置文件示例

! Configuration File for keepalived  

global_defs {
   notification_email {
         linuxedu@foxmail.com
         mageedu@.com
   }
   notification_email_from kanotify@magedu.com
   smtp_connect_timeout
   smtp_server 127.0.0.1
   router_id LVS_DEVEL
}  

vrrp_script chk_haproxy {
    script "killall -0 haproxy"
    interval
    weight
}  

vrrp_script chk_mantaince_down {
   script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
   interval
   weight
}

vrrp_instance VI_1 {
    interface eth0
    state MASTER  # BACKUP for slave routers
    priority   #  for BACKUP
    virtual_router_id
    garp_master_delay  

    authentication {
        auth_type PASS
        auth_pass password
    }
    track_interface {
       eth0
    }
    virtual_ipaddress {
        172.16.100.1/ dev eth0 label eth0:
    }
    track_script {
        chk_haproxy
        chk_mantaince_down
    }  

    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
} 

注意：
、上面的state为当前节点的起始状态，通常在master/slave的双节点模型中，其一个默认为MASTER，而别一个默认为BACKUP。
、priority为当关节点在当前虚拟路由器中的优先级，master的优先级应该大于slave的；

下面是一个notify.sh脚本的简单示例：
#!/bin/bash
# Author: MageEdu <linuxedu@foxmail.com>
# description: An example of notify script
# 

vip=172.16.100.1
contact='root@localhost'

Notify() {
    mailsubject="`hostname` to be $1: $vip floating"
    mailbody="`date '+%F %H:%M:%S'`: vrrp transition, `hostname` changed to be $1"
    echo $mailbody | mail -s "$mailsubject" $contact
}

case "$1" in
    master)
        notify master
        /etc/rc.d/init.d/haproxy start
        exit
    ;;
    backup)
        notify backup
        /etc/rc.d/init.d/haproxy restart
        exit
    ;;
    fault)
        notify fault
        exit
    ;;
    *)
        echo 'Usage: `basename $0` {master|backup|fault}'
        exit
    ;;
esac