(三) nginx高可用搭建_check nginx-优快云博客

本文链接：https://blog.youkuaiyun.com/mr2zhang/article/details/54093640

本文介绍如何使用Nginx与Keepalived搭建负载均衡集群，包括四台虚拟机的具体配置，Nginx与Keepalived的安装步骤及配置方法，并提供了测试结果。

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一、准备四台虚拟机

192.168.159.3	nginx 、keepalived
192.168.159.3	nginx 、keepalived
192.168.159.3	tomcat4
192.168.159.3	tomcat42

二、nginx的安装步骤以及负载均衡的搭建

（一）如何快速安装tengine

（二）nginx的负载均衡小例子

三、keepalived的安装及配置

1、yum install keepalived

2、在/etc/keepalived中修改keepalived.conf文件，并修改文件的权限chmod 777 keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
     zhangsan@163.com
   }
   notification_email_from keepalived@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_script chk_http_port {
   script "/usr/local/src/check_nginx_pid.sh" #shell脚本监控nginx,脚本位置要存放准确
   interval 2                           
   weight 2
}

vrrp_instance VI_1 {
    state BACKUP #主为MASTER 备为backup 这是两台机器配置的区别
    interface eth0
    virtual_router_id 51
    priority 100 #主的priority要大于备的priority
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
track_script {
  chk_http_port            #调用shell
}
    virtual_ipaddress {
        192.168.159.135
    }

 
}

3、 check_nginx_pid.sh文件内容，并且修改文件权限为可执行chmod 777 check_nginx_pid.sh

#!/bin/bash
A=`ps -C nginx --no-header |wc -l`        
if [ $A -eq 0 ];then                            
     service  keepalived stop    
     
fi

四、虚拟ip的绑定

两台nginx服务器中绑定虚拟的ip,命令如下：

ifconfig eth0:1 192.168.159.110 broadcast 192.168.159.255 netmask 255.255.255.0 up
route add -host 192.168.159.110 dev eth0:1

五、结果测试

1、启动两台tomcat

2、启动nginx,service nginx start

3、启动keepalived,service keepalived start

4、访问虚拟ip:192.168.159.100查看轮询结果,有可能存在浏览器兼容问题，可以用火狐浏览器查看轮询结果