Nginx+tomcat負載均衡配置

a、配置2個tomcat。直接複製一份tomcat在同級目錄下，看起來是這樣：
D:\apache-tomcat-6.0.26
D:\apache-tomcat-6.0.26_2

b、配置「環境變量」，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；檢查兩個tomcat是否都能分別啓動；

c、修改D:\apache-tomcat-6.0.26\conf\server.xml 3個端口號，分別是：

<Server port="8005" shutdown="SHUTDOWN">
改爲
<Server port="18005" shutdown="SHUTDOWN">(端口號隨便)


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

d、一樣修改apache-tomcat-6.0.26_2\conf\server.xml 3個端口號，不一樣的是端口號要與18080不一樣，因此修改好以後應該是這個樣子：

<Server port="18006" shutdown="SHUTDOWN">(端口號隨便)

...........

<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還要改個地方，apache-tomcat-6.0.26_2\bin下全部*.bat中的CATALINA_HOME改爲CATALINA2_HOME。

至此2個tomcat能夠同時運行了，分別打開各自的首頁localhost:18080、localhost:18081


e、配置nginx就簡單多了，修改D:\nginx-0.8.55\conf\nginx.conf文件2個地方：
一、在
   

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout 65;

   
    後面增長
    

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

    
二、在
  

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

   
    裏面增長
     

    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;

    
    整個看起來應該是：
    
   

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，所有搞定了，開啓2個tomcat,在開啓nginx，訪問http://localhost，你會看到tomcat的首頁，等等這樣還沒完，你隨便關掉其中一個tomcat，再訪問http://localhost也是能夠看到tomcat的首頁的，

這樣，nginx+tomcat負載均衡就所有搞定了。   

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