Nginx+tomcat负载均衡配置

a、配置2个tomcat。直接复制一份tomcat在同级目录下，看起来是这样：
D:\apache-tomcat-6.0.26
D:\apache-tomcat-6.0.26_2

b、配置“环境变量”，新建CATALINA_HOME，值是D:\apache-tomcat-6.0.26，再新建CATALINA2_HOME，值是D:\apache-tomcat-6.0.26_2；检查两个tomcat是否都能分别启动；

c、修改D:\apache-tomcat-6.0.26\conf\server.xml 3个端口号，分别是：

<Server port="8005" shutdown="SHUTDOWN">
改成
<Server port="18005" shutdown="SHUTDOWN">(端口号随便)


<Connector port="8080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />
改成
<Connector port="18080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />
               
               
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
改成
<Connector port="18009" protocol="AJP/1.3" redirectPort="8443" />

d、同样修改apache-tomcat-6.0.26_2\conf\server.xml 3个端口号，不同的是端口号要与18080不同，所以修改好之后应该是这个样子：

<Server port="18006" shutdown="SHUTDOWN">(端口号随便)

...........

<Connector port="18081" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />
        
...........        
               
<Connector port="18010" protocol="AJP/1.3" redirectPort="8443" />

apache-tomcat-6.0.26_2还要改个地方，apache-tomcat-6.0.26_2\bin下所有*.bat中的CATALINA_HOME改成CATALINA2_HOME。

至此2个tomcat可以同时运行了，分别打开各自的首页localhost:18080、localhost:18081

e、配置nginx就简单多了，修改D:\nginx-0.8.55\conf\nginx.conf文件2个地方：
1、在

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout 65;

   后面增加

upstream localhost {
        server localhost:18080;
        server localhost:18081;
        #ip_hash;
    }

2、在

location / {
            root   html;
            index  index.html index.htm;

   里面增加

    proxy_pass   http://localhost;
    proxy_redirect    off;
    proxy_set_header   Host $host;
    proxy_set_header   X-Real-IP $remote_addr;
    proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
    client_max_body_size   10m;
    client_body_buffer_size   128k;
    proxy_connect_timeout   15;
    proxy_send_timeout   15;
    proxy_read_timeout   15;
    proxy_buffer_size   8k;
    proxy_buffers   4 64k;
    proxy_busy_buffers_size   128k;
    proxy_temp_file_write_size  128k;

   整个看起来应该是：

location / {
          root   html;
          index  index.html index.htm;
          proxy_pass   http://localhost;
          proxy_redirect    off;
          proxy_set_header   Host $host;
          proxy_set_header   X-Real-IP $remote_addr;
          proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
          client_max_body_size   10m;
          client_body_buffer_size   128k;
          proxy_connect_timeout   15;
          proxy_send_timeout   15;
          proxy_read_timeout   15;
          proxy_buffer_size   8k;
          proxy_buffers   4 64k;
          proxy_busy_buffers_size   128k;
          proxy_temp_file_write_size  128k;       
      }

好了，全部搞定了，开启2个tomcat,在开启nginx，访问http://localhost，你会看到tomcat的首页，等等这样还没完，你随便关掉其中一个tomcat，再访问http://localhost也是可以看到tomcat的首页的，

这样，nginx+tomcat负载均衡就全部搞定了。

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nginx负载均衡配置

负载均衡