Nginx基于TCP的负载均衡的配置例子
原文：https://blog.csdn.net/bigtree_3721/article/details/72833955
nginx-1.9.0 已发布，该版本增加了 stream 模块用于一般的 TCP 代理和负载均衡。
The ngx_stream_core_module module is available since version 1.9.0. This module is not built by default, it should be enabled with the --with-stream configuration parameter.
ngx_stream_core_module 这个模块在1.90版本后将被启用。但是并不会默认安装，需要在编译时通过指定 --with-stream 参数来激活这个模块。
其他改进包括：
Change: 删除过时的 aio 和 rtsig 事件处理方法
Feature: 可在 upstream 块中使用 "zone" 指令
Feature: 流模块，支持 TCP 代理和负载均衡
Feature: ngx_http_memcached_module 支持字节范围
Feature: Windows 版本支持使用共享内存，带随机化地址空间布局.
Feature: "error_log" 指令可在 mail 和 server 级别
Bugfix: the "proxy_protocol" parameter of the "listen" directive did not work if not specified in the first "listen" directive for a listen socket.
编译安装：略
最后贴一下官方分享的stream模块的简单配置demo：
http://nginx.org/en/docs/stream/ngx_stream_core_module.html
worker_processes auto;
error_log /var/log/nginx/error.log info;
events {
worker_connections 1024;
}
stream {
upstream backend {
hash $remote_addr consistent;
server backend1.example.com:12345 weight=5;
server 127.0.0.1:12345 max_fails=3 fail_timeout=30s;
server unix:/tmp/backend3;
}
server {
listen 12345;
proxy_connect_timeout 1s;
proxy_timeout 3s;
proxy_pass backend;
}
server {
listen [::1]:12345;
proxy_pass unix:/tmp/stream.socket;
}
}
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在此我做了一个tcp反向解析的小实验
背景：125.208.14.177:3306 数据库1
125.208.14.177:3306 数据库2
218.78.186.162 nginx服务器
配置文件
worker_processes auto;
error_log /var/log/nginx/error.log info;
events {
worker_connections 1024;
}
stream {
upstream backend {
hash $remote_addr consistent;
server 125.208.14.177:3306 weight=5 max_fails=3 fail_timeout=30s;
server 125.208.14.177:3307 weight=4 max_fails=3 fail_timeout=30s;
}
server {
listen 12345;
proxy_connect_timeout 1s;
proxy_timeout 3s;
proxy_pass backend;
}
}
测试：
[root@iZ236mlq2naZ ~]# mysql -uroot -p'******' -P12345 -h218.78.186.162 -e "select * from test" test
Warning: Using a password on the command line interface can be insecure.
+-----------------------------+
| t |
+-----------------------------+
| this is 125.208.14.177:3306 |
+-----------------------------+
[root@iZ236mlq2naZ ~]# mysql -uroot -p'*****' -P12345 -h218.78.186.162 -e "select * from test" test
Warning: Using a password on the command line interface can be insecure.
^[[A+-----------------------------+
| t |
+-----------------------------+
| this is 125.208.14.177:3307 |
+-----------------------------+
[root@iZ236mlq2naZ ~]# mysql -uroot -p'*****' -P12345 -h218.78.186.162 -e "select * from test" test
Warning: Using a password on the command line interface can be insecure.
+-----------------------------+
| t |
+-----------------------------+
| this is 125.208.14.177:3306 |
+-----------------------------+
[root@iZ236mlq2naZ ~]# mysql -uroot -p'******' -P12345 -h218.78.186.162 -e "select * from test" test
Warning: Using a password on the command line interface can be insecure.
+-----------------------------+
| t |
+-----------------------------+
| this is 125.208.14.177:3306 |
+-----------------------------+
再做一个读写分离的实验：
配置文件
worker_processes auto;
error_log /var/log/nginx/error.log info;
events {
worker_connections 1024;
}
stream {
upstream readdb {
hash $remote_addr consistent; ---作为read库
server 125.208.14.177:3306 weight=5 max_fails=3 fail_timeout=30s;
server 125.208.14.177:3307 weight=4 max_fails=3 fail_timeout=30s;
}
server {
listen 12345;
proxy_connect_timeout 1s;
proxy_timeout 3s;
proxy_pass readdb;
}
upstream writedb{
hash $remote_addr consistent;
server 125.208.14.177:3308 max_fails=3 fail_timeout=30s; ---作为write库
}
server {
listen 23456;
proxy_connect_timeout 1s;
proxy_timeout 3s;
proxy_pass writedb;
}
}
注意下：绿色stream就是表示该nginx使用了tcp来负载均衡，而以前的是基于http的负载均衡。http负载均衡在配置文件中在绿色stream地方要用http来替换，见本博的另外一篇关于nginx http负载均衡的例子。
最后可以将http负载与tcp负载写一起达到多重目的。
