keepalived+nginx主主

keepalived+nginx的主备架构模式，始终会有一台服务器处于空闲状态，可以通过keepalived+nginx主主架构来实现两台服务器的合理利用，主主服务器对外有两个VIP地址来接收客户端的请求。

• 环境

192.168.2.118 nginx主/keepalived-master1
192.168.2.119 nginx从/keepalived-master2
192.168.2.112 lap

• 配置主主

在上一章已经在118和119服部署好了keepalived服务。接下来配置双主结构
备份好118和119的keepalived配置文件

cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak

118的keepalived配置文件内容如下

! Configuration File for keepalived global_defs {  notification_email {      [e-mail] }    notification_email_from [e-mail]    smtp_server 127.0.0.1    smtp_connect_timeout 30    router_id LVS_DEVEL } vrrp_script chk_nginx {    script "/data/sh/check_nginx.sh"    interval 2    weight 2 } vrrp_instance VI_1 {     state MASTER     interface eth0     lvs_sync_daemon_inteface eth0     virtual_router_id 50     priority 100     advert_int 5     nopreempt     authentication {         auth_type  PASS         auth_pass  1111     }virtual_ipaddress {          192.168.2.130     }     track_script {     chk_nginx    } } vrrp_instance VI_2 {     state BACKUP     interface eth0     lvs_sync_daemon_inteface eth0     virtual_router_id 51     priority  90     advert_int 5     nopreempt     authentication {         auth_type  PASS         auth_pass  2222     }     virtual_ipaddress {         192.168.2.131     }     track_script {     chk_nginx    } }

119服的keepalived配置文件参考上面的参数，把V1的state改成BACKUP，优先级priority改成90，把V2的state改成MASTER，优先级priority改成100

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nginx检测脚本check_nginx.sh（注意执行权限chmod u+x check_nginx.sh）

#!/bin/bash#2017年12月5日21:50:40#auto check nginx#by lee###################killall -0 nginxif [[ $? -ne 0 ]];then        /etc/init.d/keepalived stopfi

启动118和119的keepalived服务并查看日志

service keepalived starttail -f /var/log/messages

可以看到进入了master

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查看ip

ip addr list

118服：

119服：

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浏览器分别访问：

手动停止118的nginx服务，然后再访问192.168.2.130，可以正常的打开web界面

查看VIP，可以看到VIP：192.168.2.130移到了119服下：

再次手动启动118的服务

[root@mysqlm keepalived]# /usr/local/nginx/sbin/nginx [root@mysqlm keepalived]# service keepalived start

可以看到VIP：192.168.2.130又返回到118服下

至此keepalived+nginx双主结构配置完成。