CentOS 7.6安装配置Keepalived详解（三）：高可用Nginx双主模型

迷南。 2022-01-16 10:45 402阅读 0赞

1、演示环境：

<table> 
 <tbody> 
 <tr> 
 <td style="border-width:1px;">外网IP</td> 
 <td style="border-top-width:1px;border-right-width:1px;border-bottom-width:1px;border-left:none;">内网IP</td> 
 <td style="border-top-width:1px;border-right-width:1px;border-bottom-width:1px;border-left:none;">操作系统</td> 
 <td style="border-top-width:1px;border-right-width:1px;border-bottom-width:1px;border-left:none;">主机名</td> 
 <td style="border-top-width:1px;border-right-width:1px;border-bottom-width:1px;border-left:none;">部署服务</td> 
 <td style="border-top-width:1px;border-right-width:1px;border-bottom-width:1px;border-left:none;">服务器角色</td> 
 </tr> 
 <tr> 
 <td style="border-right-width:1px;border-bottom-width:1px;border-left-width:1px;border-top:none;">192.168.1.145</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">172.16.0.10</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">CentOS &nbsp; 7.6</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">node1</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">keepalived、nginx</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">负载均衡调度器</td> 
 </tr> 
 <tr> 
 <td style="border-right-width:1px;border-bottom-width:1px;border-left-width:1px;border-top:none;">192.168.1.146</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">172.16.0.11</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">CentOS &nbsp; 7.6</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">node2</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">keepalived、nginx</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">负载均衡调度器</td> 
 </tr> 
 <tr> 
 <td style="border-right-width:1px;border-bottom-width:1px;border-left-width:1px;border-top:none;">无</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">172.16.0.20</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">CentOS &nbsp; 7.6</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">web1</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">httpd</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">后端real server</td> 
 </tr> 
 <tr> 
 <td style="border-right-width:1px;border-bottom-width:1px;border-left-width:1px;border-top:none;">无</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">172.16.0.21</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">CentOS &nbsp; 7.6</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">web2</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">httpd</td> 
 <td style="border-top:none;border-left:none;border-bottom-width:1px;border-right-width:1px;">后端real server</td> 
 </tr> 
 </tbody> 
</table>

2、配置网络：

（1）node1新增一块网卡，并配置内网IP：

\# vim /etc/sysconfig/network-scripts/ifcfg-ens192

![image.png][]

\# systemctl restart network.service

\# ifconfig

![image.png][image.png 1]

（2）node2新增一块网卡，并配置内网IP：

\# vim /etc/sysconfig/network-scripts/ifcfg-ens192

![image.png][image.png 2]

\# systemctl restart network.service

\# ifconfig

![image.png][image.png 3]

（3）web1配置内网IP：

\# vim /etc/sysconfig/network-scripts/ifcfg-ens160

![image.png][image.png 4]

\# systemctl restart network.service

\# ifconfig

![image.png][image.png 5]

（4）web2配置内网IP：

\# vim /etc/sysconfig/network-scripts/ifcfg-ens160

![image.png][image.png 6]

\# systemctl restart network.service

\# ifconfig

![image.png][image.png 7]

3、node1和node2通过chrony服务同步时间

4、各节点关闭firewalld和SELinux

5、node1和node2实现通过主机名互相通信：

\# vim /etc/hosts

192.168.1.145 node1

192.168.1.146 node2

node1：

\# ping -c 3 node2

![image.png][image.png 8]

\# ping -c 3 172.16.0.11

![image.png][image.png 9]

node2：

\# ping -c 3 node1

![image.png][image.png 10]

\# ping -c 3 172.16.0.10

![image.png][image.png 11]

6、确保配置keepalived服务的node1和node2用于集群服务的接口支持MULTICAST（多播或组播）通信：

node1：\# ip a l | grep MULTICAST

![image.png][image.png 12]

node2：\# ip a l | grep MULTICAST

![image.png][image.png 13]

备注：如果网卡没有开启多播功能，可通过命令**\# ip link set multicast on dev ens160**开启

7、web1安装部署httpd：

\# yum -y install httpd

\# vim /var/www/html/index.html --> <h1>web1</h1>

\# systemctl start httpd.service

\# ss -tunlp | grep -w :80

\# systemctl enable httpd.service

8、web2安装部署httpd：

\# yum -y install httpd

\# vim /var/www/html/index.html --> <h1>web2</h1>

\# systemctl start httpd.service

\# ss -tunlp | grep -w :80

\# systemctl enable httpd.service

9、node1访问web1和web2：

\# curl http://172.16.0.20

![image.png][image.png 14]

\# curl http://172.16.0.21

![image.png][image.png 15]

10、node1安装配置keepalived：

\# yum -y install keepalived

\# cd /etc/keepalived

\# mv keepalived.conf\{,.bak\}

\# openssl rand -base64 7 --> **IDDf1j+yfw==**

\# vim keepalived.conf

**global\_defs \{**

**notification\_email \{**

**root@localhost**

**\}**

**notification\_email\_from node1@localhost**

**smtp\_server 127.0.0.1**

**smtp\_connect\_timeout 30**

**router\_id node1**

**vrrp\_mcast\_group4 224.1.100.88**

**\}**

**vrrp\_instance VI\_1 \{**

**state MASTER**

**interface ens160**

**virtual\_router\_id 50**

**priority 100**

**advert\_int 1**

**authentication \{**

**auth\_type PASS**

**auth\_pass IDDf1j+yfw==**

**\}**

**virtual\_ipaddress \{**

**192.168.1.119**

**\}**

**track\_interface \{**

**ens160**

**ens192**

**\}**

**notify\_master "/etc/keepalived/notify.sh master"**

**notify\_backup "/etc/keepalived/notify.sh backup"**

**notify\_fault "/etc/keepalived/notify.sh fault"**

**\}**

11、node2安装配置keepalived：

\# yum -y install keepalived

\# cd /etc/keepalived

\# mv keepalived.conf\{,.bak\}

\# vim keepalived.conf

**global\_defs \{**

**notification\_email \{**

**root@localhost**

**\}**

**notification\_email\_from node2@localhost**

**smtp\_server 127.0.0.1**

**smtp\_connect\_timeout 30**

**router\_id node2**

**vrrp\_mcast\_group4 224.1.100.88**

**\}**

**vrrp\_instance VI\_1 \{**

**state BACKUP**

**interface ens160**

**virtual\_router\_id 50**

**priority 98**

**advert\_int 1**

**authentication \{**

**auth\_type PASS**

**auth\_pass IDDf1j+yfw==**

**\}**

**virtual\_ipaddress \{**

**192.168.1.119**

**\}**

**track\_interface \{**

**ens160**

**ens192**

**\}**

**notify\_master "/etc/keepalived/notify.sh master"**

**notify\_backup "/etc/keepalived/notify.sh backup"**

**notify\_fault "/etc/keepalived/notify.sh fault"**

**\}**

12、node1定义邮件通知脚本：

\# vim /etc/keepalived/notify.sh

**\#!/bin/bash**

**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**

\# chmod +x /etc/keepalived/notify.sh

\# bash -n /etc/keepalived/notify.sh

**\# scp -p /etc/keepalived/notify.sh root@192.168.1.146:/etc/keepalived**

13、node1定义在不停止keepalived服务的情况下进行主备切换测试的脚本：

\# vim /etc/keepalived/chk\_maint.sh

**\#!/bin/bash**

**if \[ -f /etc/keepalived/maint \]; then**

**exit 1**

**else**

**exit 0**

**fi**

\# chmod +x /etc/keepalived/chk\_maint.sh

\# bash -n /etc/keepalived/chk\_maint.sh

**\# scp -p /etc/keepalived/chk\_maint.sh root@192.168.1.146:/etc/keepalived**

14、node1修改配置文件：

\# vim /etc/keepalived/keepalived.conf

**global\_defs \{**

**notification\_email \{**

**root@localhost**

**\}**

**notification\_email\_from node1@localhost**

**smtp\_server 127.0.0.1**

**smtp\_connect\_timeout 30**

**router\_id node1**

**vrrp\_mcast\_group4 224.1.100.88**

**\}**

**vrrp\_script chk\_maint \{**

**script "/etc/keepalived/chk\_maint.sh"**

**interval 1**

**weight -5**

**\}**

**vrrp\_instance VI\_1 \{**

**state MASTER**

**interface ens160**

**virtual\_router\_id 50**

**priority 100**

**advert\_int 1**

**authentication \{**

**auth\_type PASS**

**auth\_pass IDDf1j+yfw==**

**\}**

**virtual\_ipaddress \{**

**192.168.1.119**

**\}**

**track\_interface \{**

**ens160**

**ens192**

**\}**

**track\_script \{**

**chk\_maint**

**\}**

**notify\_master "/etc/keepalived/notify.sh master"**

**notify\_backup "/etc/keepalived/notify.sh backup"**

**notify\_fault "/etc/keepalived/notify.sh fault"**

**\}**

**备注：如果****/etc/keepalived/maint****文件存在，则权重****-5**

15、node2修改配置文件：

\# vim /etc/keepalived/keepalived.conf

**global\_defs \{**

**notification\_email \{**

**root@localhost**

**\}**

**notification\_email\_from node2@localhost**

**smtp\_server 127.0.0.1**

**smtp\_connect\_timeout 30**

**router\_id node2**

**vrrp\_mcast\_group4 224.1.100.88**

**\}**

**vrrp\_script chk\_maint \{**

**script "/etc/keepalived/chk\_maint.sh"**

**interval 1**

**weight -5**

**\}**

**vrrp\_instance VI\_1 \{**

**state BACKUP**

**interface ens160**

**virtual\_router\_id 50**

**priority 98**

**advert\_int 1**

**authentication \{**

**auth\_type PASS**

**auth\_pass IDDf1j+yfw==**

**\}**

**virtual\_ipaddress \{**

**192.168.1.119**

**\}**

**track\_interface \{**

**ens160**

**ens192**

**\}**

**track\_script \{**

**chk\_maint**

**\}**

**notify\_master "/etc/keepalived/notify.sh master"**

**notify\_backup "/etc/keepalived/notify.sh backup"**

**notify\_fault "/etc/keepalived/notify.sh fault"**

**\}**

16、启动优先级较低的node2上的keepalived服务，并查看VIP信息：

\# systemctl start keepalived.service

\# systemctl enable keepalived.service

\# ip a l

![image.png][image.png 16]

17、启动优先级较高的node1上的keepalived服务，并查看VIP信息：

\# systemctl start keepalived.service

\# systemctl enable keepalived.service

\# ip a l

![image.png][image.png 17]

18、node1创建maint文件，并查看VIP信息：

\# touch /etc/keepalived/maint

\# ip a l

![image.png][image.png 18]

**备注：****VIP****地址已经转移至****node2**

19、node1删除maint文件，并查看VIP信息：

\# rm -rf /etc/keepalived/maint

\# ip a l

![image.png][image.png 19]

**备注：****VIP****地址又转移回****node1**

20、node1安装配置nginx：

\# yum -y install nginx

\# cd /etc/nginx

\# cp nginx.conf\{,.bak\}

\# vim nginx.conf

（1）在http配置段内、server配置段外新增如下代码：

**upstream websrvs \{**

**server 172.16.0.20;**

**server 172.16.0.21;**

**\}**

（2）在server配置段内新增如下代码：

**location / \{**

**proxy\_pass http://websrvs;**

**\}**

\# nginx -t

\# systemctl start nginx.service

\# ss -tunlp | grep -w :80

\# systemctl enable nginx.service

备注：node2同样需要执行上述操作

21、使用其它主机访问node1、node2和VIP：

\# for i in \{1..4\}; do curl http://192.168.1.145; done

![image.png][image.png 20]

\# for i in \{1..4\}; do curl http://192.168.1.146; done

![image.png][image.png 21]

\# for i in \{1..4\}; do curl http://192.168.1.119; done

![image.png][image.png 22]

22、node1定义nginx进程监控脚本：

\# vim /etc/keepalived/chk\_nginx.sh

**\#!/bin/bash**

**A=$(ps -C nginx --no-headers | wc -l)**

**if \[ $A -eq 0 \]; then**

**systemctl start nginx.service**

**sleep3**

**B=\`ps -C nginx --no-headers | wc -l\`**

**if \[ $B -eq 0 \]; then**

**systemctl stop keepalived.service**

**fi**

\# chmod +x /etc/keepalived/chk\_nginx.sh

\# bash -n /etc/keepalived/chk\_nginx.sh

**\# scp -p /etc/keepalived/chk\_nginx.sh root@192.168.1.146:/etc/keepalived**

**备注：检查****nginx****是否运行，如果没有运行就启动****nginx****；如果****nginx****启动失败，则停止****keepalived**

23、node1停止keepalived服务，并修改配置文件：

\# systemctl stop keepalived.service

\# vim /etc/keepalived/keepalived.conf

**global\_defs \{**

**notification\_email \{**

**root@localhost**

**\}**

**notification\_email\_from node1@localhost**

**smtp\_server 127.0.0.1**

**smtp\_connect\_timeout 30**

**router\_id node1**

**vrrp\_mcast\_group4 224.1.100.88**

**\}**

**vrrp\_script chk\_maint \{**

**script "/etc/keepalived/chk\_maint.sh"**

**interval 1**

**weight -5**

**\}**

**vrrp\_script chk\_nginx \{**

**script "/etc/keepalived/chk\_nginx.sh"**

**interval 5**

**\}**

**vrrp\_instance VI\_1 \{**

**state MASTER**

**interface ens160**

**virtual\_router\_id 50**

**priority 100**

**advert\_int 1**

**authentication \{**

**auth\_type PASS**

**auth\_pass IDDf1j+yfw==**

**\}**

**virtual\_ipaddress \{**

**192.168.1.119**

**\}**

**track\_interface \{**

**ens160**

**ens192**

**\}**

**track\_script \{**

**chk\_maint**

**chk\_nginx**

**\}**

**notify\_master "/etc/keepalived/notify.sh master"**

**notify\_backup "/etc/keepalived/notify.sh backup"**

**notify\_fault "/etc/keepalived/notify.sh fault"**

**\}**

24、node2停止keepalived服务，并修改配置文件：

\# systemctl stop keepalived.service

\# vim /etc/keepalived/keepalived.conf

**global\_defs \{**

**notification\_email \{**

**root@localhost**

**\}**

**notification\_email\_from node2@localhost**

**smtp\_server 127.0.0.1**

**smtp\_connect\_timeout 30**

**router\_id node2**

**vrrp\_mcast\_group4 224.1.100.88**

**\}**

**vrrp\_script chk\_maint \{**

**script "/etc/keepalived/chk\_maint.sh"**

**interval 1**

**weight -5**

**\}**

**vrrp\_script chk\_nginx \{**

**script "/etc/keepalived/chk\_nginx.sh"**

**interval 5**

**\}**

**vrrp\_instance VI\_1 \{**

**state BACKUP**

**interface ens160**

**virtual\_router\_id 50**

**priority 98**

**advert\_int 1**

**authentication \{**

**auth\_type PASS**

**auth\_pass IDDf1j+yfw==**

**\}**

**virtual\_ipaddress \{**

**192.168.1.119**

**\}**

**track\_interface \{**

**ens160**

**ens192**

**\}**

**track\_script \{**

**chk\_maint**

**chk\_nginx**

**\}**

**notify\_master "/etc/keepalived/notify.sh master"**

**notify\_backup "/etc/keepalived/notify.sh backup"**

**notify\_fault "/etc/keepalived/notify.sh fault"**

**\}**

25、分别启动node1和node2上的keepalived服务：\# systemctl start keepalived.service

备注：此时node1和node2上都运行着keepalived和nginx，且node1为主节点，绑定VIP

**26、****高可用测试：**

**（1）****node1****停止****keepalived****：****VIP****漂移至****node2**

**（2）****node1****创建****/etc/keepalived/maint****文件：****VIP****漂移至****node2**

**（3）****node1****停止****nginx****：****VIP****仍然绑定在****node1****上，且****nginx****会自动启动**

**（4）****node1****安装****httpd****，并且在停止****nginx****的同时启动****httpd****：****\# killall nginx && systemctl start httpd.service****，由于****80****端口被****httpd****占用，所以****node1****上的****nginx****无法正常启动，根据****chk\_nginx.sh****脚本，继而停止****node1****上的****keepalived****，导致****VIP****漂移至****node2****，但仍不影响****VIP****的访问：**

**\# for i in \{1..4\}; do curl http://192.168.1.119; done**

![image.png][image.png 23]

**（5）****后端****real server****服务器健康状态检测，停止****web2****上的****httpd****，访问****VIP****：**

**\# for i in \{1..4\}; do curl http://192.168.1.119; done**

![image.png][image.png 24]

备注：每次测试后都恢复至步骤25的状态

27、node1停止keepalived服务，并修改配置文件，配置高可用nginx双主模型：

\# systemctl stop keepalived.service

\# openssl rand -base64 7 --> **9xEKWUjHZw==**

\# vim /etc/keepalived/keepalived.conf

**global\_defs \{**

**notification\_email \{**

**root@localhost**

**\}**

**notification\_email\_from node1@localhost**

**smtp\_server 127.0.0.1**

**smtp\_connect\_timeout 30**

**router\_id node1**

**vrrp\_mcast\_group4 224.1.100.88**

**\}**

**vrrp\_script chk\_maint \{**

**script "/etc/keepalived/chk\_maint.sh"**

**interval 1**

**weight -5**

**\}**

**vrrp\_script chk\_nginx \{**

**script "/etc/keepalived/chk\_nginx.sh"**

**interval 5**

**\}**

**vrrp\_instance VI\_1 \{**

**state MASTER**

**interface ens160**

**virtual\_router\_id 50**

**priority 100**

**advert\_int 1**

**authentication \{**

**auth\_type PASS**

**auth\_pass IDDf1j+yfw==**

**\}**

**virtual\_ipaddress \{**

**192.168.1.119**

**\}**

**track\_interface \{**

**ens160**

**ens192**

**\}**

**track\_script \{**

**chk\_maint**

**chk\_nginx**

**\}**

**notify\_master "/etc/keepalived/notify.sh master"**

**notify\_backup "/etc/keepalived/notify.sh backup"**

**notify\_fault "/etc/keepalived/notify.sh fault"**

**\}**

**vrrp\_instance VI\_2 \{**

**state BACKUP**

**interface ens160**

**virtual\_router\_id 51**

**priority 98**

**advert\_int 1**

**authentication \{**

**auth\_type PASS**

**auth\_pass 9xEKWUjHZw==**

**\}**

**virtual\_ipaddress \{**

**192.168.1.118**

**\}**

**track\_interface \{**

**ens160**

**ens192**

**\}**

**track\_script \{**

**chk\_maint**

**chk\_nginx**

**\}**

**notify\_master "/etc/keepalived/notify.sh master"**

**notify\_backup "/etc/keepalived/notify.sh backup"**

**notify\_fault "/etc/keepalived/notify.sh fault"**

**\}**

28、node2停止keepalived服务，并修改配置文件，配置高可用nginx双主模型：

\# systemctl stop keepalived.service

\# vim /etc/keepalived/keepalived.conf

**global\_defs \{**

**notification\_email \{**

**root@localhost**

**\}**

**notification\_email\_from node2@localhost**

**smtp\_server 127.0.0.1**

**smtp\_connect\_timeout 30**

**router\_id node2**

**vrrp\_mcast\_group4 224.1.100.88**

**\}**

**vrrp\_script chk\_maint \{**

**script "/etc/keepalived/chk\_maint.sh"**

**interval 1**

**weight -5**

**\}**

**vrrp\_script chk\_nginx \{**

**script "/etc/keepalived/chk\_nginx.sh"**

**interval 5**

**\}**

**vrrp\_instance VI\_1 \{**

**state BACKUP**

**interface ens160**

**virtual\_router\_id 50**

**priority 98**

**advert\_int 1**

**authentication \{**

**auth\_type PASS**

**auth\_pass IDDf1j+yfw==**

**\}**

**virtual\_ipaddress \{**

**192.168.1.119**

**\}**

**track\_interface \{**

**ens160**

**ens192**

**\}**

**track\_script \{**

**chk\_maint**

**chk\_nginx**

**\}**

**notify\_master "/etc/keepalived/notify.sh master"**

**notify\_backup "/etc/keepalived/notify.sh backup"**

**notify\_fault "/etc/keepalived/notify.sh fault"**

**\}**

**vrrp\_instance VI\_2 \{**

**state MASTER**

**interface ens160**

**virtual\_router\_id 51**

**priority 100**

**advert\_int 1**

**authentication \{**

**auth\_type PASS**

**auth\_pass 9xEKWUjHZw==**

**\}**

**virtual\_ipaddress \{**

**192.168.1.118**

**\}**

**track\_interface \{**

**ens160**

**ens192**

**\}**

**track\_script \{**

**chk\_maint**

**chk\_nginx**

**\}**

**notify\_master "/etc/keepalived/notify.sh master"**

**notify\_backup "/etc/keepalived/notify.sh backup"**

**notify\_fault "/etc/keepalived/notify.sh fault"**

**\}**

29、分别启动node1和node2上的keepalived服务：\# systemctl start keepalived.service

30、node1查看VIP信息：\# ip a l

![image.png][image.png 25]

31、node2查看VIP信息：\# ip a l

![image.png][image.png 26]

32、使用其它主机访问2个VIP：

\# for i in \{1..4\}; do curl http://192.168.1.119; done

![image.png][image.png 27]

\# for i in \{1..4\}; do curl http://192.168.1.118; done

![image.png][image.png 28]

**备注：**

Ø**此处****2****个****VIP****均为外网****VIP****，内网无需配置****VIP**

Ø**DNS****服务主从，将域名的****2****条****A****记录分别解析为上述****2****个****VIP****，通过主****/****备和备****/****主实现负载均衡**

**33、****双主模型高可用测试：**

**（1）n****ode2****停止****keepalived****：****2****个****VIP****都绑定至****node1**

**（2）****node2****创建****/etc/keepalived/maint****文件：****2****个****VIP****都绑定至****node1**

**（3）****node2****停止****nginx****：****VIP 192.168.1.118****仍然绑定在****node2****上，且****nginx****会自动启动**

**（4）****node2****安装****httpd****，并且在停止****nginx****的同时启动****httpd****：****\# killall nginx && systemctl start httpd.service****，由于****80****端口被****httpd****占用，所以****node2****上的****nginx****无法正常启动，根据****chk\_nginx.sh****脚本，继而停止****node2****上的****keepalived****，导致****VIP 192.168.1.118****漂移至****node1****，但仍不影响****2****个****VIP****的访问：**

**\# for i in \{1..4\}; do curl http://192.168.1.119; done**

![image.png][image.png 29]

**\# for i in \{1..4\}; do curl http://192.168.1.118; done**

![image.png][image.png 30]

**（5）****后端****real server****服务器健康状态检测，停止****web1****上的****httpd****，访问****2****个****VIP****：**

**\# for i in \{1..4\}; do curl http://192.168.1.119; done**

![image.png][image.png 31]

**\# for i in \{1..4\}; do curl http://192.168.1.118; done**

![image.png][image.png 32]

备注：每次测试后都恢复至步骤25的状态

转载于:https://blog.51cto.com/qiuyue/2367806

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