Nginx+Keepalived高可用架构平台

Nginx高性能、稳定性成为IT人士青睐的http和反向代理服务器。今天我们来一起来温习一下Nginx+Keepalived高可用配置，鉴于互联网类似的优秀文章很多，这里仅供参考和交流。

一、实验环境：

系统环境：CentOS 6.0 x86_64
Nginx版本：nginx v1.2.4
Keepalived版本：keepalived v1.2.1
Nginx-1：192.9.117.160 （Master）
Nginx-2：192.9.117.161 （Backup）

二、Nginx安装配置：

分别在两台服务器安装Nginx、keepalived，如下：
yum install -y pcre-devel 安装perl 兼容的正规表达式库

tar -xzf nginx-1.2.4.tar.gz && cd nginx-1.2.4 ; sed -i -e 's/1.2.2//g' -e 's/nginx\//TDTWS/g' -e 's/"NGINX"/"TDTWS"/g' src/core/nginx.h &&./configure --prefix=/usr/local/nginx --user=www --group=www  --with-http_stub_status_module --with-http_ssl_module

三、Keepalived安装配置：

tar -xzvf keepalived-1.2.1.tar.gz &&cd keepalived-1.2.1 && ./configure && make && make install
if
[ $? -eq 0 ];then
echo "Install keepalived success,please waiting configure keepalived ..............."
else
echo "Install keepalived failed ,please check install version !"
exit 0
fi
DIR=/usr/local/ ;cp $DIR/etc/rc.d/init.d/keepalived  /etc/rc.d/init.d/ ; cp $DIR/etc/sysconfig/keepalived /etc/sysconfig/ ; mkdir -p /etc/keepalived ; cp $DIR/sbin/keepalived /usr/sbin/

Nginx、Keepalived软件安装完毕，接下来进行详细配置。

四、配置Keepalived：

两台服务器端keepalived.conf内容都为如下，都设置为backup，不抢占，注意修改优先级不同：

! Configuration File for keepalived
global_defs {
notification_email {
      wgkgood@163.com
}
    notification_email_from wgkgood@163.com
    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
}
# VIP1
vrrp_instance VI_1 {
     state BACKUP
     interface eth0
     lvs_sync_daemon_inteface eth0
     virtual_router_id 151
     priority 100
     advert_int 5
     nopreempt
     authentication {
         auth_typePASS
         auth_pass 1111
     }
     virtual_ipaddress {
         192.9.117.162
     }
     track_script {
     chk_nginx
    }
}

如上配置，我们需要自己建立check_nginx脚本，以方便检查本地Nginx是否存活更好的切换。Check_nginx.sh脚本内容如下：

#!/bin/bash
#auto check nginx process
#2012-10-16 wugk
killall -0   nginx
if
[[ $? -ne 0 ]];then
/etc/init.d/keepalived stop
fi

五、Nginx 配置：

在两台Nginx服务器分别新建index.html测试页面，然后启动Nginx服务测试。
访问VIP http://192.9.117.162 如下：

Down掉192.9.117.160的Nginx服务，分别查看keepalived后台日志和ping VIP日志如下：
Oct 16 16:47:48 localhost Keepalived: Stopping Keepalived v1.2.1 (10/16,2012)
Oct 16 16:47:49 localhost Keepalived_vrrp: Terminating VRRP child process on signal

转载请保留固定链接： https://linuxeye.com/configuration/853.html

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