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宁夏网站制作|nginx+keepalive达成双机热备

发表日期:2024-10-24   作者来源:www.sjnhun.com   浏览:0   标签:网站制作    

Keepalived介绍

Keepalived是一个基于VRRP协议来达成的服务高可用策略,可以借助其来防止IP单点问题。但它一般不会单独出现,而是与其它负载均衡技术(如nginx)一块工作来达到集群的高可用。

安装nginx和keepalived命令

yum install nginx -y

yum install keepalived -y

配置nginx服务器

master宁夏网站制作|nginx+keepalive达成双机热备192.168.1.11

修改 文件 /usr/share/nginx/html/index.html 内容为nginx:192.198.1.11

测试nginx脚本

Vim /opt/chk_nginx.sh

#!/bin/bash

counter=$(ps -C nginx --no-heading|wc -l)

if [ "${counter}" = "0" ]; then

/usr/local/nginx/sbin/nginx

sleep 2

counter=$(ps -C nginx --no-heading|wc -l)

if ["${counter}" = "0" ]; then

/etc/init.d/keepalived sTOP

fi

fi

配置keepalived服务

修改master(192.168.1.10)配置文件 /etc/keepalived/keepalived.conf:

vrrp_script chk_http_port {

script "/opt/chk_nginx.sh"

interval 2

weight -5

fall 2

rise 1

}

vrrp_instance VI_1 {

state MASTER

interface em1

mcast_src_ip 192.168.1.10

virtual_router_id 51

priority 101

advert_int 1

virtual_ipaddress {

192.168.1.20

}

track_script {

chk_http_port

}

}

修改slave(192.168.1.11)配置文件 /etc/keepalived/keepalived.conf:

vrrp_script chk_http_port {

script "/opt/chk_nginx.sh"

interval 2

weight -5

fall 2

rise 1

}

vrrp_instance VI_1 {

state BACKUP

interface em1

mcast_src_ip 192.168.1.11

virtual_router_id 51

priority 100

advert_int 1

virtual_ipaddress {

192.168.1.20

}

track_script {

chk_http_port

}

}

启动服务

在两台服务器上运行如下命令

/usr/local/nginx/sbin/nginx

/etc/init.d/keepalived start

在浏览器中打开 http://192.168.1.20,内容为nginx:192.198.1.10

停止master(192.168.1.10)上的nginx,

再在浏览器中打开 http://192.168.1.20,内容为nginx:192.198.1.11

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