双主模式nginx + keepalived配置（双机互为主备）

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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

Server1：192.168.30.61
Server2：192.168.30.62

要设置的两个虚拟IP

Virtual IP1：192.168.30.51
Virtual IP2：192.168.30.52

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192.168.30.61

vi /etc/keepalived/keepalived.conf

配置内容如下：

global_defs
{notification_email{123456@qq.com}notification_email_from 123456@qq.comsmtp_server 127.0.0.1stmp_connect_timeout 30router_id LVS_DEVEL
}vrrp_script Monitor_Nginx {script "/usr/local/keepalived/scripts/monitor_nginx.sh"interval 2weight 2
}# 虚拟IP1, 本机作为Master
vrrp_instance VI_1 {state MASTERinterface enp0s3virtual_router_id 51priority 100advert_int 1track_interface {enp0s3}authentication {auth_type PASSauth_pass 123456}virtual_ipaddress {192.168.30.51}itrack_script {Monitor_Nginx}}# 虚拟IP2, 本机作为Backup
vrrp_instance VI_2 {state BACKUPinterface enp0s3virtual_router_id 52priority 100advert_int 1track_interface {enp0s3}authentication {auth_type PASSauth_pass 123456}virtual_ipaddress {192.168.30.52}track_script {Monitor_Nginx}}

配置第二台服务器

第二台服务器ip为192.168.30.62

vi /etc/keepalived/keepalived.conf

配置内容如下：

global_defs
{notification_email{123456@qq.com}notification_email_from 123456@qq.comsmtp_server 127.0.0.1stmp_connect_timeout 30router_id LVS_DEVEL
}vrrp_script Monitor_Nginx {script "/usr/local/keepalived/scripts/monitor_nginx.sh"interval 2weight 2
}# 虚拟IP1, 本机作为BACKUP
vrrp_instance VI_1 {state BACKUPinterface enp0s3virtual_router_id 51priority 100advert_int 1track_interface {enp0s3}authentication {auth_type PASSauth_pass 123456}virtual_ipaddress {192.168.30.51}track_script {Monitor_Nginx}
}# 虚拟IP2, 本机作为Master
vrrp_instance VI_2 {state MASTERinterface enp0s3virtual_router_id 52priority 100advert_int 1track_interface {enp0s3}authentication {auth_type PASSauth_pass 123456}virtual_ipaddress {192.168.30.52}track_script {Monitor_Nginx}}

监控脚本

和之前的监控脚本一样

# 监控nginx进程，若nginx主进程不存在则启动nginx
# 若5s后nginx进程还是不存在的话kill掉keepalived进程,防止nginx没运行该主机的keepalived还接管虚拟IP
#!/bin/bash
if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]then/usr/local/nginx/sbin/nginxsleep 5if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]thenkillall keepalivedfi
fi

测试

修改nginx默认访问页nginx的默认页面

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

修改server1的页，加入IP： 192.168.30.61

<!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! 192.168.30.61 </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>
</body>
</html>

server2同理

两个机器都启动keepalived和nginx