keepalived搭建及故障切换简单测试

约定不等于承诺〃 2022-01-15 08:15 375阅读 0赞

### 1. 前期规划 ###

系统：CentOS release 6.5 (Final)

实验环境：vmware workstations 14 pro

地址规划：

<table> 
 <tbody> 
  <tr> 
   <td><p>主机</p></td> 
   <td><p>IP地址</p></td> 
  </tr> 
  <tr> 
   <td><p>Node1(master)</p></td> 
   <td><p>192.168.17.101</p></td> 
  </tr> 
  <tr> 
   <td><p>Node2(backup)</p></td> 
   <td><p>192.168.17.102</p></td> 
  </tr> 
  <tr> 
   <td><p>vip</p></td> 
   <td><p>192.168.17.222</p></td> 
  </tr> 
 </tbody> 
</table>

测试时间：2018-11-27

### 2. keepalived搭建 ###

挂载光盘

[![clip\_image002][clip_image002]][clip_image002_clip_image002]

查看挂载情况

[![clip\_image004][clip_image004]][clip_image004_clip_image004]

编辑yum源

[![clip\_image005][clip_image005]][clip_image005_clip_image005]

测试yum

[![clip\_image007][clip_image007]][clip_image007_clip_image007]

node2重复以上操作

安装keepalived软件

[![clip\_image009][clip_image009]][clip_image009_clip_image009]

node2同样的方式安装

编辑keepalived的主配置文件

[![clip\_image011][clip_image011]][clip_image011_clip_image011]

编辑node2的配置文件

[![clip\_image013][clip_image013]][clip_image013_clip_image013]

两个主机的配置文件基本相同，主要区别在于优先级的不同。

启动keepalived服务

[![clip\_image015][clip_image015]][clip_image015_clip_image015]

node2同样启动服务

启动后查看网卡，发现vip已经出现在node1的eth0上了，node2没有

[![clip\_image017][clip_image017]][clip_image017_clip_image017]

[![clip\_image019][clip_image019]][clip_image019_clip_image019]

测试vip的连通性

[![clip\_image020][clip_image020]][clip_image020_clip_image020]

### 3. 故障模拟 ###

故障模拟1：node1主机上关闭keepalived，查看连通性

[![clip\_image022][clip_image022]][clip_image022_clip_image022]

[![clip\_image023][clip_image023]][clip_image023_clip_image023]

查看node2的网卡情况，vip已经跑到了node2上。

[![clip\_image025][clip_image025]][clip_image025_clip_image025]

重新启动node1的keepalived，网络正常，vip重新出现在了node1上。

[![clip\_image027][clip_image027]][clip_image027_clip_image027]

[![clip\_image028][clip_image028]][clip_image028_clip_image028]

[![clip\_image030][clip_image030]][clip_image030_clip_image030]

故障模拟2：node1主机关机，查看连通性

首先将keepalived设置成开机自启

[![clip\_image031][clip_image031]][clip_image031_clip_image031]

服务器node1关机

[![clip\_image032][clip_image032]][clip_image032_clip_image032]

网络正常，vip跑到了node2上。

[![clip\_image033][clip_image033]][clip_image033_clip_image033]

[![clip\_image035][clip_image035]][clip_image035_clip_image035]

node1开机

[![clip\_image037][clip_image037]][clip_image037_clip_image037]

网络正常，vip又自动切换到了node1上。

[![clip\_image038][clip_image038]][clip_image038_clip_image038]

[![clip\_image040][clip_image040]][clip_image040_clip_image040]

### 4. 结论 ###

keepalived可以实现主机的故障切换，每次切换会丢掉一个数据包。

转载于:https://blog.51cto.com/zhangzhk/2378589

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