使用nginx的tcp负载解决exchange2016的客户端访问负载

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本文介绍Nginx 1.9.0版本新增的Stream模块，该模块用于实现四层协议的转发、代理及负载均衡等功能。文章通过具体配置示例展示了如何使用Stream模块进行TCP和UDP负载均衡配置。

前言

nginx从1.9.0开始，新增加了一个stream模块，用来实现四层协议的转发、代理或者负载均衡等。这完全就是抢HAproxy份额的节奏，鉴于nginx在7层负载均衡和web service上的成功，和nginx良好的框架，stream模块前景一片光明。

stream 模块编译

stream模块默认没有编译到nginx，编译nginx时候 ./configure –with-stream 即可

官网：http://nginx.org/en/docs/stream/ngx_stream_core_module.html

用法

stream模块用法和http模块差不多，关键的是语法几乎一致。熟悉http模块配置语法的上手更快
以下是一个配置了tcp负载均衡和udp(dns)负载均衡的例子, 有 server，upstream块，而且还有server，
hash， listen， proxy_pass等指令，如果不看最外层的stream关键字，还以为是http模块呢。

修改配置文件：

vim /etc/nginx/nginx.conf

具体内容如下：

# For more information on configuration, see:
# * Official English Documentation: http://nginx.org/en/docs/
# * Official Russian Documentation: http://nginx.org/ru/docs/

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /var/run/nginx.pid;

# Load dynamic modules. See /usr/share/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;

events {
worker_connections 1024;
}

http {
    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;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

include /etc/nginx/mime.types;
default_type application/octet-stream;

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;
}
#负载exchange2016前端的模块配置

stream {
    upstream mail {
        least_conn;//连接数进行负载
        server 172.20.224.136:443 max_fails=2 fail_timeout=10s;//被动检查服务器响应
        server 172.20.224.57:443 max_fails=2 fail_timeout=10s;
        }

    server {
        listen        443;
        proxy_pass    mail;
        proxy_timeout 3s;
        proxy_connect_timeout 1s;
    }

    upstream smtp {
        least_conn;
        server 172.20.224.136:25 max_fails=2 fail_timeout=10s;
        server 172.20.224.57:25 max_fails=2 fail_timeout=10s;
        }

    server {
        listen        25;
        proxy_pass    smtp;
        proxy_timeout 3s;
        proxy_connect_timeout 1s;
    }

    upstream pop {
        least_conn;
        server 172.20.224.136:110 max_fails=2 fail_timeout=10s;
        server 172.20.224.57:110 max_fails=2 fail_timeout=10s;
        }

    server {
        listen        110;
        proxy_pass    pop;
        proxy_timeout 3s;
        proxy_connect_timeout 1s;
    }

    upstream imap {
        least_conn;
        server 172.20.224.136:143 max_fails=2 fail_timeout=10s;
        server 172.20.224.57:143 max_fails=2 fail_timeout=10s;
        }

    server {
        listen        143;
        proxy_pass    imap;
        proxy_timeout 3s;
        proxy_connect_timeout 1s;
    }

    upstream pops {
        least_conn;
        server 172.20.224.136:995 max_fails=2 fail_timeout=10s;
        server 172.20.224.57:995 max_fails=2 fail_timeout=10s;
        }

    server {
        listen        995;
        proxy_pass    pops;
        proxy_timeout 3s;
        proxy_connect_timeout 1s;
    }
        upstream imaps {
        least_conn;
        server 172.20.224.136:993 max_fails=2 fail_timeout=10s;
        server 172.20.224.57:993 max_fails=2 fail_timeout=10s;
        }

    server {
        listen        993;
        proxy_pass    imaps;
        proxy_timeout 3s;
        proxy_connect_timeout 1s;
    }

    upstream smtps {
        least_conn;
        server 172.20.224.136:587 max_fails=2 fail_timeout=10s;
        server 172.20.224.57:587 max_fails=2 fail_timeout=10s;
        }

    server {
        listen        587;
        proxy_pass    smtps;
        proxy_timeout 3s;
        proxy_connect_timeout 1s;
    }

        upstream smtps1 {
        least_conn;
        server 172.20.224.136:465 max_fails=2 fail_timeout=10s;
        server 172.20.224.57:465 max_fails=2 fail_timeout=10s;
        }

    server {
        listen        465;
        proxy_pass    smtps1;
        proxy_timeout 3s;
        proxy_connect_timeout 1s;
    }

}

配置使用wq推出保存，在使用命令

cd /etc/nginx/nginx.d

nginx -s reload

重新加载服务之后就可以使用了