一、环境准备

192.168.113.11	Nginx+Keepalive(Master)
192.168.113.22	Nginx+keepalive(Backup)
192.168.113.33	Nginx(web服务器)
192.168.113.44	Nginx(服务器）

二、环境搭建准备

2.1 Nginx源码编译安装

参考作责之前发布《Nginx源码编译安装》https://blog.csdn.net/m0_55213400/article/details/147066230?spm=1001.2014.3001.5501

2.2 Nginx配置负载均衡反向代理

192.168.113.11

192.168.113.22

    在http{ }模块定义地址池upstream releserver {server 192.168.113.33:80;server 192.168.113.44:80;}server {listen       80;server_name  localhost;#charset koi8-r;#access_log  logs/host.access.log  main;location / {proxy_set_header Host $host;proxy_set_header X-Real-IP $remote_addr;proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;proxy_set_header X-Forwarded-Proto $scheme;proxy_connect_timeout 5s;proxy_read_timeout 30s;proxy_send_timeout 10s;proxy_pass http://releserver; 调用地址池}

2.3 web服务器配置

192.168.113.33

192.168.113.44

站点目录：自定义

        location / {#allow 0.0.0.0/24;  # 公司内网#allow 10.0.0.0/8;      # 内部服务器#deny all;              # 拒绝其他所有IPproxy_set_header Host $host;proxy_set_header X-Real-IP $remote_addr;proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;proxy_set_header X-Forwarded-Proto $scheme;proxy_connect_timeout 5s;proxy_read_timeout 30s;proxy_send_timeout 10s;root   /usr/local/nginx/html/laoshi/admin;index  index.html index.htm;}

2.3 Keepalive编译安装

keepalive官网下载链接https://www.keepalived.org/download.htmlhttps://www.keepalived.org/download.html

编译步骤如下


yum install -y gcc gcc-c++ make automake autoconf libtooltar -zxvf keepalived-2.3.4.tar.gzcd keepalived-2.3.4/./configure   --prefix=/usr/local/keepalived   --sysconfdir=/etc   --with-init=systemd   --with-openssl   --with-snmpmake && make installcd /etc/keepalived/cp keepalived.conf.sample keepalived.conf

2.4 设置允许虚拟IP

主备都需要

echo 'net.ipv4.ip_nonlocal_bind = 1' >> /etc/sysctl.conf && sysctl -p

2.5 开始配置keepalive 主备都需要配置（重点）

virtual_router_id 51 必须与主备保持一致

priority 100 如果主为100 则备低于100

auth_type PASS 必须主备保持一致
auth_pass 1111 必须主备保持一致

! Configuration File for keepalivedglobal_defs {router_id 192.168.113.11
}vrrp_script check_nginx {script "/usr/local/bin/check_nginx.sh"interval 2 #每隔2S执行脚本weight -20}vrrp_instance VI_1 {state MASTERinterface ens33virtual_router_id 51priority 100advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.113.100 #定义虚拟IP}track_script {check_nginx}# Allow packets addressed to the VIPs above to be receivedaccept
}

判断Nginx运行状态脚本

#!/bin/bash
#检查Nginx状态是否存在
if [ $(ps -C nginx --no-header | wc -l) -eq 0 ];then#Nginx不存在systemctl restart nginxsleep 3#以防万一再次尝试重启一下nginxif [ $(ps -C nginx --no-header | wc -l) -eq 0 ];then#重启失败 强制停止keepalived服务systemctl stop keepalivedexit 1fi
fi
exit 0