配置 Nginx 负载均衡监测节点状态

Posted 2020-09-21

淘宝技术团队开发了一个 Tengine ( nginx 的分支 ) 模块 nginx_upstream_check_module ，用于提供主动式后端服务器健康检查，通过它可以检测后端 realserver 的健康状态，如果后端 realserver 不可用，则所有的请求就不会转发到该节点上，需要通过打补丁的方式将该模块添加到 Nginx 中。

1、安装 nginx_upstream_check_module 模块

cd /usr/local/src
wget https://codeload.github.com/yaoweibin/nginx_upstream_check_module/zip/master
yum install -y unzip patch
upzip master
cd nginx-1.6.3
patch -p1 < ../nginx_upstream_check_module-master/check_1.5.12+.patch
./configure --prefix=/usr/local/nginx --user=nginx --group=nginx --with-http_ssl_module --with-http_stub_status_module --add-module=../nginx_upstream_check_module-master/
make
mv /usr/local/nginx/sbin/nginx{,.ori}
cp ./objs/nginx /usr/local/nginx/sbin/
/usr/local/nginx/sbin/nginx -t
/usr/local/nginx/sbin/nginx -V

 

2、配置 Nginx 健康检查

[[email protected] ~]# cat /usr/local/nginx/conf/nginx.conf
worker_processes  1;    
events {
    worker_connections  1024;
}
http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;
    
upstream static_pools {
    server 192.168.123.103:80 weight=1;
    server 192.168.123.104:80 weight=1;
    check interval=3000 rise=2 fall=5 timeout=1000 type=http;
}

# 上面配置的意思是：对 static_pools 这个负载均衡条目中的所有节点，每隔 3 秒检测一次，请求 2 次正常则标记 realserver 状态为 up ，如果检测 5 次都失败，则标记 realserver 状态为 down ，超时时间为 1 秒，检查的协议是 HTTP

upstream default_pools{
    server 192.168.123.103:80 weight=1;
}
    server {
        listen       80;
        server_name  bbs.abc.com;       
        location / {
            root   html/bbs;       
            index  index.html index.htm;
            proxy_pass http://default_pools;
            include proxy.conf;
        }
   
        location ~ .*.(gif|jpg|jpeg|png|bmp|swf|css|js)$ {
            proxy_pass http://static_pools;
            include proxy.conf;
        }

        location /status {
            check_status;
            access_log off;
        }
    }
}

[[email protected] conf]# cat proxy.conf
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_connect_timeout 60;
proxy_send_timeout 60;
proxy_read_timeout 60;
proxy_buffer_size 4k;
proxy_buffers 4 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;

# 重启 Nginx ，注意不是重新加载
/usr/local/nginx/sbin/nginx -t
/usr/local/nginx/sbin/nginx -s stop
/usr/local/nginx/sbin/nginx

 

3、查看结果