Linux下Nginx + Keepalived搭建负载均衡与高可用服务

user nginx;
worker_processes  auto;

error_log  /var/log/nginx/error.log warn;

pid        /var/run/nginx.pid;

events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;
    proxy_buffer_size 512k;
    proxy_buffers 32 512k;
    proxy_busy_buffers_size 512k;
    log_format  main  ‘$remote_addr - $remote_user [$time_local] "$request" ‘
                      ‘$status $body_bytes_sent "$http_referer" ‘
                      ‘"$http_user_agent" "$http_x_forwarded_for"‘;

    access_log  /var/log/nginx/access.log  main;
    sendfile        on;
    keepalive_timeout  65;
    
    #配置上游
    upstream loadBanlance{
        ip_hash;

　　　　 #把需要配置负载的服务器及服务监听端口加入进来
        server 192.168.1.110:8080;
        server 192.168.1.111:8080;
    }

　　 #配置监听
    server {
        listen       9000;
        server_name  localhost;

        location / {
            root   /opt/project/dist; #前端页面路径，根据实际情况填写
            index  index.html; #前端首页面
            client_max_body_size    500m;
            proxy_pass http://loadBanlance; #代理转发
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
}

service nginx reload

global_defs {
    notification_email {
        xxxxxxx@qq.com　　　　　　　　　　　 #通知邮箱
    }
    notification_email_from sns-lvs@gmail.com
    smtp_server smtp.hysec.com
    smtp_connection_timeout 30
    router_id  nginx_master              # 自定义唯一id，主服务器为nginx_master,从服务器为nginx_slave
}

vrrp_script chk_http_port {
    script "/etc/keepalived/check_nginx.sh"  #检测脚本位置
    interval 2                               #（检测脚本执行的间隔）
    weight 2
}

vrrp_instance VI_1 {
    state MASTER                        # 指定keepalived的角色，MASTER为主，BACKUP为从
    interface ens32                     # 当前进行vrrp通讯的网络接口卡(以实际环境为准)
    virtual_router_id 66                # 虚拟路由编号，主从要一致
    priority 100                        # 优先级，数值越大，获取处理请求的优先级越高
    advert_int 1                        # 检查间隔，默认为1s(vrrp组播周期秒数)
    authentication {
        auth_type PASS
        auth_pass 1111
    }

    track_script {
        chk_http_port                   #（调用检测脚本）
    }

    virtual_ipaddress {
        192.168.1.112                   # 定义虚拟ip(VIP)，可多设，每行一个
    }
}

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

fi

systemctl keepalived start