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@126.com  
   }  
   notification_email_from kanotify@magedu.com 
   smtp_connect_timeout 3  
   smtp_server 127.0.0.1  
   router_id LVS_DEVEL  
}  
 
vrrp_script chk_haproxy {  
    script "killall -0 haproxy"  
    interval 1  
    weight 2  
}  
 
vrrp_script chk_mantaince_down {
   script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
   interval 1
   weight 2
}
 
vrrp_instance VI_1 {  
    interface eth0  
    state MASTER  # BACKUP for slave routers
    priority 101  # 100 for BACKUP
    virtual_router_id 51 
    garp_master_delay 1 
  
    authentication {  
        auth_type PASS  
        auth_pass password  
    }  
    track_interface {  
       eth0    
    }  
    virtual_ipaddress {  
        172.16.100.1/16 dev eth0 label eth0:0 
    }  
    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：
1、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。
2、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 0
    ;;
    backup)
        notify backup
        /etc/rc.d/init.d/haproxy restart
        exit 0
    ;;
    fault)
        notify fault
        exit 0
    ;;
    *)
        echo 'Usage: `basename $0` {master|backup|fault}'
        exit 1
    ;;
esac