nginx负载均衡检测节点状态

 nginx需要打补丁的方式将该模块添加到nginx中，原生不支持.

1.官方地址

https://github.com/yaoweibin/nginx_upstream_check_module

2.安装nginx_upstream_check_module模块

 系统如果已经安装nginx，则需要采取打补丁的方式安装该模块

• 查看安装版本

  /application/nginx/sbin/nginx -v
  

• 下载补丁包

  wget https://codeload.github.com/yaoweibin/nginx_upstream_check_module/zip/master
  

• 解压下载的补丁包

   unzip master
  

• 重新编译nginx
  因为是对nginx打补丁，需要对应安装版本的软件包

   cd nginx-1.15.12
   patch -p1 < ../nginx_upstream_check_module-master/check_1.14.0+.patch 
  

  编译参数要和以前一样，最后加上 --add-module=…/nginx_upstream_check_module-master/

   ./configure  --user=www  --group=www  --prefix=/application/nginx-1.15.2  --with-http_ssl_module  --with-http_gzip_static_module  --with-http_stub_status_module --add-module=../nginx_upstream_check_module-master/
  

• 安装

  make
  

  如果是新增的nginx则继续执行make install，给已经安装的nginx系统打监控补丁则不需要执行make install。
  将打过补丁的nginx二进制程序复制到sbin目录下

   //备份
   mv /application/nginx/sbin/nginx{,.ori}
   //拷贝
   cp ./objs/nginx /application/nginx/sbin/
  

• 检查是否正常

   /application/nginx/sbin/nginx -t
  

  

   /application/nginx/sbin/nginx -V
  

  

3.配置健康检查

• 开启检查

    location /check{
        check_status;
        access_log  off;
     }
  

• 完整nginx配置

  http {
  include       mime.types;
  default_type  application/octet-stream;
  
  #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  logs/access.log  main;
  
  sendfile        on;
  #tcp_nopush     on;
  
  #keepalive_timeout  0;
  keepalive_timeout  65;
  
  #gzip  on;
  
  server {
      listen       80;
      server_name  localhost;
  
      location / {
          auth_basic           "study site";
          auth_basic_user_file /application/nginx/conf/htpasswd;
          root   html;
          index  index.html index.htm;
      }
  
      location /url {
         proxy_pass http://cluster;
      }
  
       
      location /status {
         stub_status on;
         access_log off;
      }
     
     location /check{
        check_status;
        access_log  off;
     }
    }
   upstream cluster {
  	server 192.168.0.1:80;
  	server 192.168.0.2:80;
  	check interval=5000 rise=1 fall=3 timeout=4000;
  	}
  }
  

4.效果图