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JEAP 6 - 使用mod_cluster 連接JBoss做Load Balance

先前版本的JBoss 大多用 mod_jk, 但是這個版本的J老闆已經開始支援更聰明的load balance 機制,mod_cluster.
mod_cluster 有什麼好處咧?他可以去判斷server的狀況來決定request 要導到哪一台server 上,如CPU的loading 啦~session 的數量等等。而先前的只有亂數丟,跟輪流丟這兩種方式而已。

在開始設定前,請先確定你的JBoss Cluster 環境已經建立起來了。

1. Standalone 啟動 Cluster
2. Domain 啟動 Cluster


首先,請自己去Apache 的官網下載 Apache 的 HTTP Server, 當然,如果你是Red Hat Enterprise Linux 的客戶,那應該內建就會有了。
如果你是JBoss Enterprise 的客戶,這時就幸運拉,因為安裝的紅帽都幫你準備好了!可以到JBoss EAP 6 的下載網頁裡面,下載最新的HTTP Server!

網路上到處是文章,這裡我就不再贅述Apache 的安裝與使用方式了。
首先,先確定你的 HTTP_INSTALL_PATH/modules 下,有這些so 檔案, 如果沒有,請自己找!當然如果你是JBoss Enterprise 的客戶,一樣可以粉方便地去下載!

請找 :jboss-eap-native-webserver-connectors-xxxxx

Apache 設定

開始設定config 檔案。
請到HTTP_INSTALL_PATH/conf 下,打開 httpd.conf

LoadModule proxy_cluster_module modules/
LoadModule slotmem_module modules/
LoadModule manager_module modules/
LoadModule advertise_module modules/

記得將下方的 檔案關閉,不然會有衝突。
#LoadModule proxy_balancer_module modules/


Listen {你的IP}:10001

#以下這行只有Linux 環境下需要加

MemManagerFile /var/cache/httpd   
<VirtualHost {你的IP}:10001>
  <Directory />
    Order deny,allow
    Allow from all
  <Location /mod_cluster-manager>
   SetHandler mod_cluster-manager
   Allow from all
  KeepAliveTimeout 60
  MaxKeepAliveRequests 0
  ManagerBalancerName myBalancer
  AdvertiseFrequency 5

重開Apache 這樣mod_cluster 就設定好了。

JBoss 設定
如果你是Standalone , 請參考先前的Cluster 設定。
如果你是Domain , 請參考先前的Cluster 設定。
以下的設定都是相同的,只是 standalone 模式請改在standalone-ha.xml 裡,
domain 模式的話,就改在domain.xml 你設定的profile中 (例如: ha, full-ha)
告訴JBoss 怎麼樣可以找到剛剛設定的Apache.


<subsystem xmlns="urn:jboss:domain:modcluster:1.1">
   <mod-cluster-config advertise-socket="modcluster" balancer="myBalancer" connector="ajp" proxy-list="Apache的IP:10001">
         <load-metric type="busyness"/>

之後啓動JBoss server這樣就完成拉!

確認是否成功,你可以到 http://Apache的IP:10001/mod_cluster-manager 看到以下的畫面拉!

然後,為了確定Cluster 是可以導頁,證明我沒有呼隆~
所以拿了一個自己寫的session test 來證明!
先登入網頁,可以看到Session 是在server four,

把server four 關掉,

重新load 剛剛的網頁,發現session 裡面的值,Christina 還在,
而且server 變成server three.


JEAP 6 native component內沒有包含這幾個so檔ㄟ, JEAP 5 native component才有ㄟ, 是不是沒包好
Christina Lin said…
那時抓圖沒抓好,應該是jboss-eap-native-webserver-connectors 我已經更正了!

Could u translate this in English...tq
請問一下如果有其中一台jboss發生錯誤,前端的apache仍會把session轉送至這台有問題的jboss,有辦法避免嗎? 謝謝!!

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