案例：一个朋友要用Nginx代理MySQL（MySQL局域网），不用NAT映射等，好吧，做个笔记。
Nginx版本：1.9.x（持tcp的负载均衡，nginx_tcp_proxy_module（姚伟斌阿里团队也可以实现））
Nginx官方模块： ngx_stream_core_module --with-stream_ssl_module（ssl协议支持，比如MySQL ssl）
官网：
1、查看现有编译
--user=nginx --group=nginx --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module --with-http_realip_module --with-http_flv_module --with-http_mp4_module --with-http_gzip_static_module
2、重新编译：
--user=nginx --group=nginx --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module --with-http_realip_module --with-http_flv_module --with-http_mp4_module --with-http_gzip_static_module --with-stream --with-stream_ssl_module
注意：--with-stream --with-stream_ssl_module
3、配置、检测、重启nginx：
配置：
stream {
upstream mysql {
zone myapp1 64k;
server localhost:3306 weight=1 max_fails=3 fail_timeout=30s;
#server 192.168.1.221:3306 weight=1 max_fails=2 fail_timeout=30s;
}
server {
listen 2188;
proxy_connect_timeout 1s;
proxy_timeout 3s;
proxy_pass mysql;
}
}
检测：
[root@autoCentOS67X64 conf]# nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
[root@autoCentos67X64 conf]#
启动：
[root@autoCentos67X64 conf]# netstat -atupn|grep nginx
tcp 0 0 0.0.0.0:2188 0.0.0.0:* LISTEN 2359/nginx
[root@autoCentos67X64 conf]#
4、验证：
[root@log~]# mysql -uroot -prenzhiyuan -h 192.168.1.11 -P2188
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.6.21-log MySQL Community Server (GPL)
Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>
注意：2188可是Nginx的端口，代理（负载）后端的MySQL。其它玩法大家可自己研究。
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