Nginx+keepalived双机热备（双主模式）

此前已经写过一篇使用keepalived实现nginx的高可用，这种方式有一台机器一直作backup使用，有50%的资源被浪费。
Nginx+keepalived双机热备（主从模式）
keepalived安装请查看
Nginx+keepalived双机热备（主从模式）

下面来配置nginx+keepalived的双主机双机热备，这种配置下有两个Virtual IP，两个机器互为主备，最后我们把域名DNS服务器解析至两个Virtual IP即可。

环境介绍

两台服务器

Server1：192.168.70.132
Server2：192.168.70.133

要设置的两个虚拟IP

Virtual IP1：192.168.70.130
Virtual IP2：192.168.70.129

将DNS域名解析至两个虚拟IP： 192.168.30.51、192.168.30.52

网络扑拓图

这里写图片描述

配置第一台服务器

第一台服务器ip为192.168.70.132

vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id NodeA
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_script chk_nginx {   #检查nginx进程脚本此处暂未启动
   script "/etc/keepalived/nginx_check.sh"  
   interval 2  
   weight -20  
} 

#虚拟IP1, 本机作为Master
vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {  # 执行上面检测nginx进程脚本
       chk_nginx  
    } 
    virtual_ipaddress {
        192.168.70.130
    }
}


#虚拟IP2, 本机作为Backup
vrrp_instance VI_2 {
    state BACKUP
    interface ens33
    virtual_router_id 52
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {  # 执行上面检测nginx进程脚本
       chk_nginx  
    } 
    virtual_ipaddress {
        192.168.70.129
    }
}

配置第二台服务器

vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id NodeB #自定义主机名
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_script chk_nginx {   #检查nginx进程脚本此处暂未启动
   script "/etc/keepalived/nginx_check.sh"  
   interval 2  
   weight -20  
} 

#虚拟IP1, 本机作为BACKUP
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {  # 执行上面检测nginx进程脚本
       chk_nginx  
    } 
    virtual_ipaddress {  #虚拟ip
        192.168.70.130
    }
}


#虚拟IP2, 本机作为Master
vrrp_instance VI_2 {
    state MASTER
    interface ens33
    virtual_router_id 52
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {  # 执行上面检测nginx进程脚本
       chk_nginx  
    } 
    virtual_ipaddress {  #虚拟ip
        192.168.70.129
    }
}

监控脚本

#!/bin/sh  
A=`ps -C nginx --no-header |wc -l`  
if [ $A -eq 0 ];then  
    nginx  
    sleep 2  
    if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then  
        killall keepalived  
    fi  
fi

测试

修改nginx默认访问页nginx的默认页面

注意：测试过程中请重启iptables.

# nginx 默认访问页面
# $NGINX_HOME/html/index.html
vim /usr/share/nginx/html/index.html

修改server1的页，加入IP： 192.168.70.132

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
<p>IP:192.168.70.132</p>
</body>
</html>

修改server2的页，加入IP： 192.168.70.133

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
<p>IP:192.168.70.133</p>
</body>
</html>

两个机器都启动keepalived和nginx

访问虚拟ip1
在浏览器输入192.168.30.130进入访问页面
这里写图片描述

访问虚拟ip2
在浏览器输入192.168.30.129进入访问页面
这里写图片描述

证明两个VIP都起效果了

Kill掉server2的keepalived

killall keepalived

访问ip2
这里写图片描述
证明了server1为server2的备机，server2 down掉后server1接管server2的nginx访问

Kill掉server1机器的keepalived，启动server2机器的keepalived

Kill掉server1

killall keepalived

启动server2

service keepalived start

访问ip1
这里写图片描述
证明了server2为server1的备机，server1 down掉后server2接管server1的nginx访问

Nginx+keepalived双机热备（双主模式）

Nginx+keepalived双机热备（双主模式）

环境介绍

网络扑拓图

配置第一台服务器

配置第二台服务器

监控脚本

测试

注意：测试过程中请重启iptables.

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