keepalived主动切换vip，邮件通知

1.主动切换vip

通过vrrp_script判断，调节权重进行切换

! Configuration File for keepalived  

global_defs {  
   notification_email {  
         root@localhost
   }  
   notification_email_from [e-mail]
   smtp_connect_timeout 3  
   smtp_server 127.0.0.1  
   router_id LVS_DEVEL  
}  


vrrp_script chk_mantaince_down {
   script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"  #[ -f /etc/keepalived/down ]检查是否有down这个文件，如果真返回1，1代表失败，如果假返回0，0代表成功
# commadn1 && command2 只有在 && 左边的命令返回真（命令返回值 $? == 0），&& 右边的命令才会被执行
# commadn1 || command2 只有在 || 左边的命令返回假（命令返回值 $? == 1），|| 右边的命令才会被执行。
   interval 1
   weight -2
#只要上面exit 1,weight就-2，下面的101 -2 = 99 比BACKUP的100少了，优先级低了，就变成备用状态了，再次检测如果down没了，权重又成101了，就又变成MASTER了。这样就可以手动干预vip在节点间切换
}

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 {  
192.168.255.100/24
    }  
    track_script {  
        chk_mantaince_down
    }  
 }

2.在状态切换时进行通知

notify scripts and alerts are optional
filenames of scripts to run on transitions
can be unquoted (if just filename)
or quoted (if has parameters)
to MASTER transition
notify_master /path/to_master.sh
to BACKUP transition
notify_backup /path/to_backup.sh
FAULT transition
notify_fault “/path/fault.sh VG_1”

1.使用：

notify_master
notify_backup
notify_fault
可以使用在vrrp_sync_group和vrrp_instance中，较多使用在vrrp_instance中
如果脚本带有参数，需要用”“扩起：notify_fault “/path/fault.sh VG_1”
当发生状态切换时，会根据切换的状态分配调用MASTER BACKUP FAULT指定的脚本

2.使用：

notify进行通知,notify可以使用在vrrp_sync_group和vrrp_instance中
此时脚本需要接受三个参数：
$1 指明组 vrrp_sync_group 或 实例 vrrp_instance
$2 组或instance名
$3 “MASTER”|”BACKUP”|”FAULT”

for ANY state transition.
“notify” script is called AFTER the
notify_* script(s) and is executed
with 3 arguments provided by keepalived
(ie don’t include parameters in the notify line).
arguments
$1 = “GROUP”|”INSTANCE”
$2 = name of group or instance
$3 = target state of transition
(“MASTER”|”BACKUP”|”FAULT”)
notify /path/notify.sh

还是notify_master, notify_backup, notify_fault 这种好用

下面是一个notify.sh脚本的简单示例：

#!/bin/bash
# Author: MageEdu <[e-mail]>
# 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 stop
exit 0
    ;;
    fault)
        notify fault
        /etc/rc.d/init.d/haproxy stop
exit 0
    ;;
    *)
echo 'Usage: `basename $0` {master|backup|fault}'
exit 1
    ;;
esac

MASTER:
!/bin/bash
vip=192.168.255.100
concat=’root@localhost’
thisis=`ifconfig eno16777736|awk ‘/inet /{print $2}’`

notify() {
mailbody=”vrrp transaction,$vip floated to $thisip”
subject=”$thisip become $vip master”
echo $mailbody | mail -s $subject $concat
}

notify

于是配置文件变为

! Configuration File for keepalived  

global_defs {  
   notification_email {  
         root@localhost
   }  
   notification_email_from [e-mail]
   smtp_connect_timeout 3  
   smtp_server 127.0.0.1  
   router_id LVS_DEVEL  
}  


vrrp_script chk_mantaince_down {
   script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"  #[ -f /etc/keepalived/down ]检查是否有down这个文件，如果真返回1，1代表失败，如果假返回0，0代表成功
# commadn1 && command2 只有在 && 左边的命令返回真（命令返回值 $? == 0），&& 右边的命令才会被执行
# commadn1 || command2 只有在 || 左边的命令返回假（命令返回值 $? == 1），|| 右边的命令才会被执行。
   interval 1
   weight -2
#只要上面exit 1,weight就-2，下面的101 -2 = 99 比BACKUP的100少了，优先级低了，就变成备用状态了，再次检测如果down没了，权重又成101了，就又变成MASTER了。这样就可以手动干预vip在节点间切换
}

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 {  
192.168.255.100/24
    }  
    track_script {  
        chk_mantaince_down
    }  
    notify_master "/etc/keepalived/notify.sh master"  
    notify_backup "/etc/keepalived/notify.sh backup"  
    notify_fault "/etc/keepalived/notify.sh fault" 
#在脚本中配置邮件，或其他操作就可以了
 }