需求， 后端有websokcer 通信，

目标： 实现通过nginx 监听 8193 转发到后端。

主要参考 stream 模块，它跟http 是同一级别的。

user  nginx;
worker_processes  auto;
error_log  /var/log/nginx/error.log notice;
pid        /var/run/nginx.pid;
events {
worker_connections  1024;
}
http {
include       /etc/nginx/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  /var/log/nginx/access.log  main;
sendfile        on;
#tcp_nopush     on;
keepalive_timeout  65;
#gzip  on;
client_header_buffer_size 16k;
large_client_header_buffers 4 32k;
include /etc/nginx/conf.d/.conf;
include /etc/nginx/conf.d/uat/.conf;
include /etc/nginx/conf.d/uat2/.conf;
include /etc/nginx/conf.d/uat/one/.conf;

}
stream {
log_format basic '$remote_addr [$time_local] '
                 '$protocol $status $bytes_sent $bytes_received '
                 '$session_time';
upstream tcp_proxy {
hash $remote_addr consistent; #远程地址做个hash
server 192.168.1.209:31005;
}
server {
listen 8193;
proxy_connect_timeout 1s; #后端链接空闲超时断开
proxy_timeout 10s; #后端连接超时时间
proxy_pass tcp_proxy;


access_log  /var/log/nginx/uat-cloudservice2.kattgatt.com.log basic;
#error_log  /var/log/nginx/uat-cloudservice2.kattgatt.com.error.log;
}
}