系統總是頻繁更新，為了避免更新系統的時候領導看不到東西，打算用ngix做代理，后臺部署兩個tomcat做負載均衡，避免更新一臺就無法使用系統的問題，這兩天看了寫資料，把幾個關鍵點記錄在這里以便備忘。

環境：jdk,1.7,tomcat7,nginx1.5.8; 基于64位的windows配置

第一步：更改tomcat三個端口，保證同一臺機器上可以運行兩個tomcat，更改的端口包括server port，兩個connector port，xml配置參見下面，為了避免文件過大，刪除了注釋和無關的配置：

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1. <? xml? version= '1.0'? encoding= 'utf-8' ?>??
2. ???
3. < Server? port= "18005"? shutdown= "SHUTDOWN" >???
4. ?? < Listener? className= "org.apache.catalina.core.AprLifecycleListener"? SSLEngine= "on"? />??
5. ?? <!--Initialize?Jasper?prior?to?webapps?are?loaded.?Documentation?at?/docs/jasper-howto.html?-->??
6. ?? < Listener? className= "org.apache.catalina.core.JasperListener"? />??
7. ?? <!--?Prevent?memory?leaks?due?to?use?of?particular?java/javax?APIs-->??
8. ?? < Listener? className= "org.apache.catalina.core.JreMemoryLeakPreventionListener"? />??
9. ?? < Listener? className= "org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"? />??
10. ?? < Listener? className= "org.apache.catalina.core.ThreadLocalLeakPreventionListener"? />??
11. ??
12. ????
13. ?? < GlobalNamingResources >??
14. ????
15. ???? < Resource? name= "UserDatabase"? auth= "Container"??
16. ?????????????? type= "org.apache.catalina.UserDatabase"??
17. ?????????????? description= "User?database?that?can?be?updated?and?saved"??
18. ?????????????? factory= "org.apache.catalina.users.MemoryUserDatabaseFactory"??
19. ?????????????? pathname= "conf/tomcat-users.xml"? />??
20. ?? </ GlobalNamingResources >??
21. ??
22. ???
23. ?? < Service? name= "Catalina" >??
24. ??
25. ???
26. ???? < Connector? port= "8082"? protocol= "HTTP/1.1"??
27. ??????????????? connectionTimeout= "20000"??
28. ??????????????? redirectPort= "8443"? />??
29. ?????
30. ???? < Connector? port= "18009"? protocol= "AJP/1.3"? redirectPort= "8443"? />??
31. ??
32. ???
33. ?????。。。。。??
34. ?? </ Service >??
35. </ Server >??

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第二部，配置nginx（負載均衡）：

http節點下增加如下配置：

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1. upstream?localhost?{??????
2. ????????#針對不同ip的用戶請求分配固定的tomcat響應其請求。??????
3. ????????ip_hash;??
4. ????????????????#配置tomcat服務器的ip：端口，處理請求權重??
5. ????????server?localhost:8080?weight=5;???
6. ????????server?localhost:8082?weight=5;??
7. ????}??

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http的節點下更改location/節點配置：

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1. location?/?{??
2. ???????????#root???html;??
3. ???????????#index??index.html?index.htm;??
4. ????????proxy_connect_timeout???3;??
5. ????????proxy_send_timeout??????30;??
6. ????????proxy_read_timeout??????30;??
7. ????????proxy_pass?http://localhost;??
8. ???????}??

配置完畢后，啟動兩個tomcat，再啟動nginx，啟動ngix方式：進入dos命令窗口，切換至nginx主目錄，輸入命令nginx.exe即可，

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停止nginx可以使用nginx.exe -s stop

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了解更詳細的步驟參考下面兩個鏈接：

http://ari.iteye.com

http://www.blogjava.net/tunaic/archive/2009/11/30/304212.html

CentOS系統下做nginx和tomcat負載均衡