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JEAP 6 - Standalone 與 Domain Mode 兩種不同的管理模式?

在進入Cluster 之前,就會提到有兩種設定的方式,
必須要在這之前先說明這兩種有什麼不同,這樣在選擇Cluster 的管理方式也會有比較清楚的認識。

Standalone Mode 

並不是每個人都需要用到集中的管理模式,有許多小系統只需要跑在單一台instance 上即可,或是在本機開發程式時。使用Domain mode 好像有點殺雞用牛刀!

這裡要澄清的一點,Standalone 也可以設定為Cluster, 但它每個 Server instance 都是獨立的process, 所以管理的人員必須要自己去確認所有的 EAR, WAR 與設定在Cluster 的多個node上都是同步的.


Domain Mode

這是新的J老闆非常重要的里程碑,它終於開始支援統一集中的管理介面。以前也是可以做到,但是必須透過JON 才能做到,現在不用了!

它把一堆的Server定義成一個Domain, 透過一個單一的點,叫做Domain Controller 來管理上面所有的Server。 而Domain Controller 是透過 Host Controller 去管理每個Host 上面的server, 本身Domain Controller 也是經由指定Host Controller其中的一台選出來的!
這樣好像是繞口令, 還是用圖解的吧 !


Host 每個實體機器的都稱作Host
Server 每個單一的JBoss instance.
Host Controller 每當一個Host有任何一個JBoss 啓動的時候,就會生出一個Host Controller, 這個 Host Controller 負責去啓動跟關閉這台機器上的其他JBoss instance, 接收Domain Controller 的管理指令去管理那幾台Server. 
(設定的地方在 domain/configuration/host.xml)
















Domain Controller 簡單來說,就是單一的管理窗口!透過他跟其他的Host 聯絡設定部署的內容!這樣使用者就不需要一臺一臺的管理!他其實也只是一臺Host Controller 拿來兼差當總管理員!
(設定的地方在 domain/configuration/Domain.xml)


Server Group 每個server 都屬於一個server group,但如果兩台以上擁有相同的部署內容與設定,那這兩台就算同一個server group (咦?!好像Cluster, 沒錯,就是。) 一個domain 可以擁有無數個server group.

以下是jboss.org 官網的示意圖,我也覺得還蠻清楚的,供大家參考!

當被問到究竟要選擇什麼mode呢?

我想答案很簡單,如果你今天的環境只需要一臺,或是你正在自己的環境上開發,那Standalone mode 就是你的選擇了。
如果是production 環境,需要複雜的管理機制,很多台機器,甚至還有Cluster, 那Domain mode 就是你要的拉!



Comments

Samuel Liang said…
Dear Christian :
想請教文中最後一張圖的架構下,Host1的Domain Controller怎麼知道Host2~4有GroupA & GroupB需要被啟動呢?
Samuel Liang said…
自問自答好了,從這篇http://wei-meilin.blogspot.tw/2012/07/jeap-6-domain-mode.html
看來JBoss7的Cluster啟動方式是扮演Domain Controller的該Host要先啟動,隨後才是手動將其他受控的Host一一啟動後,整個Cluster才算啟動完畢,而非Domain Controller啟動來自動帶起其他的Host的。

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