keepalived（二）vip漂移

╰+哭是因爲堅強的太久メ 2022-05-12 05:42 157阅读 0赞

# 实验 #

#### 内容：测试vip能否正常切换 ####

#### 架构图 ####

![这里写图片描述][70]

#### 环境 ####

<table> 
 <thead> 
  <tr> 
   <th>ip</th> 
   <th>系统</th> 
   <th>安装的软件</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>192.168.253.158</td> 
   <td>CentOS7</td> 
   <td>keepalived</td> 
  </tr> 
  <tr> 
   <td>192.168.253.128</td> 
   <td>CentOS7</td> 
   <td>keepalived</td> 
  </tr> 
 </tbody> 
</table>

第一步：在192.168.253.128主机上安装keepalived和发邮件的工具

yum install mailx -y
    yum install keepalived -y

第二步：在192.168.253.128主机上修改配置文件/etc/keepalived/keepalived.conf

! Configuration File for keepalived
    global_defs {
        notification_email {
             root@localhost
        }
        notification_email_from keepalived@localhost
        smtp_server 127.0.0.1
        smtp_connect_timeout 30
        router_id 192.168.253.128
    }
    
    vrrp_instance VI_1 {
        state MASTER
        interface ens33
        virtual_router_id 15
        priority 95
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 1234
        }
        virtual_ipaddress {
            192.168.253.190 dev ens33
        }
        notify_master "/etc/keepalived/notify.sh master" ##这个脚本稍后会创建
        notify_backup "/etc/keepalived/notify.sh backup"
        notify_fault "/etc/keepalived/nofify.sh fault"
    }

第三步：创建keepalived状态发生变化时触发的脚本/etc/keepalived/nofify.sh

#!/bin/bash
    #发邮件通知root，keepalived状态发生改变
    contact='root@localhost'
    
    notify() {
        local mailsubject="$(hostname) to be $1, vip floating"
        local mailbody="$(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

第四步：在192.168.253.158上安装keepalived，将192.168.253.128的脚本与配置文件发送到192.168.253.158上  
192.168.253.158端操作

yum install keepalived -y
    yum install mailx -y

192.168.253.128端操作

scp /etc/keepalived/keepalived.conf  root@192.168.253.158:/etc/keepalived/keepalived.conf
    scp /etc/keepalived/notify.sh  root@192.168.253.158:/etc/keepalived/notify.sh

第五步：在192.168.253.158上修改配置文件

[root@localhost ~]# cat /etc/keepalived/keepalived.conf 
    ! Configuration File for keepalived
    global_defs {
        notification_email {
             root@localhost
        }
        notification_email_from keepalived@localhost
        smtp_server 127.0.0.1
        smtp_connect_timeout 30
        router_id 192.168.253.158 ##修改为当前主机的主机名，这里直接用ip了
    }
    
    vrrp_instance VI_1 {
        state BACKUP  ##设置为BACKUP节点
        interface ens33 
        virtual_router_id 15 
        priority 90   ##优先级
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 1234
        }
        virtual_ipaddress {
            192.168.253.190 dev ens33
        }
        notify_master "/etc/keepalived/notify.sh master"
        notify_backup "/etc/keepalived/notify.sh backup"
        notify_fault "/etc/keepalived/nofify.sh fault"
    }

第六步：测试  
我们先启动192.168.253.158备用节点的keepalived

systemctl  start keepalived

看一下vip是否在192.168.253.158主机上  
![这里写图片描述][70 1]

![这里写图片描述][70 2]  
这里可以看出192.168.253.158正在广播自己的心跳信息。

这时候我们吧192.168.253.128启动起来

systemctl  start keepalived

![这里写图片描述][70 3]  
这里可以看到通告的人变成192.168.253.128了

![这里写图片描述][70 4]  
vip这时候也飘过来了。说明没问题。

我们再看一下192.168.253.128主机上脚本是否成功触发了  
![这里写图片描述][70 5]  
收到邮件，成功

[70]: /images/20220512/66d3e2f561f847c884a57c2e90f14343.png
[70 1]: /images/20220512/f87bc144f5594a1ebced37964567ad60.png
[70 2]: /images/20220512/ca74951dbd7a49098428af8611306d23.png
[70 3]: /images/20220512/51875f56e6da41388bd98f330a24e2b6.png
[70 4]: /images/20220512/dacb8f01a31a45c08829df39fe091918.png
[70 5]: /images/20220512/512a078f3aff4033baee4501d7778b6c.png