nginx keepalived 主从切换

注: LVS + Keepalived 不知道为什么出现一个很郁闷的问题.......

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原来的拓扑是:

LVS 主 + WEB1

LVS 从 + WEB2

IP 是3个外网IP WEB1 123.123.123.121 WEB2 123.123.123.122

VIP 123.123.123.123

直接访问 WEB1 123.123.123.121 正常

直接访问 WEB2 123.123.123.122 正常

访问VIP 不行 VIP 可以ping通····

关闭 WEB1 服务 VIP 可以了.... 郁闷....是否VIP 80 与 WEB1 80端口冲突？

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转入正题.......

拓扑

WEB1 + Keepalived 主 IP 123.123.123.121

WEB2 + Keepalived 从 IP 123.123.123.122

VIP 123.123.123.123

两台机都安装 Keepalived

下载 wget http://www.keepalived.org/software/keepalived-1.2.1.tar.gz
tar zxvf keepalived-1.2.1.tar.gz

cd keepalived-1.2.1

./configure

make

make install

将keepalived做成启动脚务:

cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/

cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/

mkdir /etc/keepalived

cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/

cp /usr/local/sbin/keepalived /usr/sbin/

【service keepalived start 可启动，这里暂时不启动，等修改完配置文件以后再启动】

Keealived的配置文件修改..

vi /etc/keepalived/keepalived.conf

【主 的Keepalived 的配置文件设置】
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vrrp_script chk_http_port {
script "/opt/local/nginx/nginx_pid.sh" 监控脚本
interval 2 监控时间
weight 2
}
vrrp_instance VI_1 {
state MASTER 主
interface eth0 监控网卡
virtual_router_id 51 这个两台服务器必须一样
priority 101 权重值 高于 从
authentication {
auth_type PASS 加密
auth_pass 1111 与从想同
}
track_script {
chk_http_port 执行监控的服务
}
virtual_ipaddress {
123.123.123.123 VIP
}
}

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【从 的Keepalived 的配置文件设置】

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vrrp_script chk_http_port {
script "/opt/local/nginx/nginx_pid.sh" 监控脚本
interval 2 监控时间
weight 2
}
vrrp_instance VI_1 {
state BACKUP 从
interface eth0 监控网卡
virtual_router_id 51 这个两台服务器必须一样
priority 100 权重值 低于 主
authentication {
auth_type PASS 加密
auth_pass 1111 与从想同
}
track_script {
chk_http_port 执行监控的服务
}
virtual_ipaddress {
123.123.123.123 VIP
}
}

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【编写Nginx 的监控脚本】

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#!/bin/bash

A=`ps -C nginx --no-header |wc -l`

if [ $A -eq 0 ];then

/opt/local/nginx/sbin/nginx

sleep 3

if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then

killall keepalived

fi

fi

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WEB1 WEB2 分别启动...Nginx 与 Keepalived 测试一下...

# ip add list 查看 eth0 是否绑定 vip

关闭 主 Keepalived 查看是否 从 会 接管 VIP