如何使用Nginx搭建WCF集群！

1. 话不多说，一图胜千言，图中的服务器都是采用vmware虚拟化，如下图：

三台windows机器 ，两个WCF的windows服务器承载(192.168.23.187,192.168.23.188)，一台Client的服务器(192.168.23.1)

一台Centos机器，用来承载web复杂均衡nginx(192.168.23.190)。

在所有的Client的Hosts文件中增加host映射：【192.168.23.190 cluster.com】，方便通过域名的形式访问nginx所在服务器的ip地址。

既然是测试，肯定就是简单的程序，代码就不完全给出了。

public class HomeService : IHomeService
{
    public string DoWork(string msg)
    {
        var ip = Dns.GetHostAddresses(Dns.GetHostName()).FirstOrDefault(i => i.AddressFamily ==
                                                           AddressFamily.InterNetwork).ToString();
        return string.Format("当前 request 由 server={0} 返回", ip);
    }
}

App.Config代码

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
</startup>
<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior name="">
<serviceMetadata httpGetEnabled="true" httpsGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="false" />
</behavior>
</serviceBehaviors>
</behaviors>
<services>
<service name="WcfService.HomeService">
<endpoint address="/HomeService" binding="basicHttpBinding" contract="WcfService.IHomeService">
<identity>
<dns value="localhost" />
</identity>
</endpoint>
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
<host>
<baseAddresses>
<add baseAddress="http://192.168.23.187:8733" />
</baseAddresses>
</host>
</service>
</services>
</system.serviceModel>
</configuration>

因为windows的两台机器的ip地址是192.168.23.187，192.168.23.188，所以部署的时候注意一下config中的baseAddress地址。

nginx我想大家用的还是比较多的，去官网下载最新的就好【nginx-1.13.6】：http://nginx.org/en/download.html，下载之后，就是常规的三板斧安装!!!

[root@localhost nginx-1.13.6]# ./configure --prefix=/usr/myapp/nginx
[root@localhost nginx-1.13.6]# make && make install

然后在nginx的安装目录下面找到conf文件，修改里面的nginx.conf 配置。

详细配置如下，注意下面“标红”的地方，权重按照1：5的方式进行调用，关于其他的配置，大家可以在网上搜一下就可以了。

#user nobody;
worker_processes 1;
#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
#pid logs/nginx.pid;
events {
worker_connections 1024;
}
http {
include 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 logs/access.log main;
sendfile on;
#tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 65;
#gzip on;
upstream cluster.com{
server 192.168.23.187:8733 weight=1;
server 192.168.23.188:8733 weight=5;
}
server {
listen 80;
server_name localhost;
#charset koi8-r;
#access_log logs/host.access.log main;
location / {
root html;
index index.html index.htm;
proxy_pass http://cluster.com;
#设置主机头和客户端真实地址，以便服务器获取客户端真实IP
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Real-IP $remote_addr;
}
#error_page 404 /404.html;
# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
# proxy_pass http://127.0.0.1;
#}
# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ \.php$ {
# root html;
# fastcgi_pass 127.0.0.1:9000;
# fastcgi_index index.php;
# fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
# include fastcgi_params;
#}
# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
# deny all;
#}
}
# another virtual host using mix of IP-, name-, and port-based configuration
#
#server {
# listen 8000;
# listen somename:8080;
# server_name somename alias another.alias;
# location / {
# root html;
# index index.html index.htm;
# }
#}
# HTTPS server
#
#server {
# listen 443 ssl;
# server_name localhost;
# ssl_certificate cert.pem;
# ssl_certificate_key cert.key;
# ssl_session_cache shared:SSL:1m;
# ssl_session_timeout 5m;
# ssl_ciphers HIGH:!aNULL:!MD5;
# ssl_prefer_server_ciphers on;
# location / {
# root html;
# index index.html index.htm;
# }
#}
}

第一件事就是将 192.168.23.190 映射到本机的host中去，因为服务不提供给第三方使用，所以加host还是很轻松的。

192.168.23.190 cluster.com

然后就是client端程序添加服务引用，因为添加了host映射，所以服务引用地址就是"http://cluster.com"。 代码如下：

class Program
{
static void Main(string[] args)
{
for (int i = 0; i < 1000; i++)
{
HomeServiceClient client = new HomeServiceClient();
var info = client.DoWork("hello world!");
Console.WriteLine(info);
System.Threading.Thread.Sleep(1000);
}
Console.Read();
}

最后来执行以下程序，看看1000次循环中，是不是按照权重1:5 的方式对后端的wcf进行调用的???

看到没有，是不是很牛逼，我只需要通过cluster.com进行服务访问，nginx会自动给我复杂均衡，这就是我们开发中非常简单化的wcf复杂均衡。