多层NG代理4层探活转7层

多层NG代理4层探活转7层

1、前提

• nginx已经编译集成Lj2.1
• nginx已经编译集成nginx_upstream_check_module
• 多台nginx转发终端服务只能tcp探活，上游服务需要URL探活

2、4层upstream探活配置--nginx-B

upstream lama.member {
    server 127.0.0.1:8081 max_fails=3 fail_timeout=30s;
    server 127.0.0.2:8081 max_fails=3 fail_timeout=30s;
    server 127.0.0.3:8081 max_fails=3 fail_timeout=30s;
    check interval=2000 rise=3 fall=5 timeout=2000 type=tcp default_down=false;
}

3、nginx_upstream_check_module模块接口--nginx-B

    location /check_status {
        check_status;
        access_log   off;
    }

4、lua脚本检测列表--nginx-B

  listen 8088;
  
  location /tcpserver {
      content_by_lua_block {
        local res=ngx.location.capture("/check_status?format=csv&status=up")
        for val in string.gmatch(res.body,"[^%c]+") do
          if string.match(val,'127.0.0.[12]:8081') then
            ngx.say(val)
            ngx.status=ngx.HTTP_OK
            ngx.exit(200)
          end
        end
        ngx.status=ngx.HTTP_NOT_FOUND
        ngx.say('Error fond')
      }

    }

5、上游服务探活--nginx-A

upstream lama.member {
    server 127.0.0.5:8088 max_fails=3 fail_timeout=30s;
    server 127.0.0.4:8088 max_fails=3 fail_timeout=30s;
    check interval=2000 rise=3 fall=5 timeout=2000 type=tcp default_down=false;
    check_http_send "HEAD /tcpserver HTTP/1.0rnrn";
    check_http_expect_alive http_2xx http_3xx;

}