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JON - Security Token 不見怎麼辦!

這個算是FAQ了,安裝JON 的時候,有些東西要特別注意,以免日後要修改很困難,
如你的Agent 的名字,因為JON 會把兩邊的資料存在Agent 與 Server身上,
所以,如果你突然想換那麻煩就大條了。

出問題的地方,有些人重新安裝了Agent之後,出現了無法與Server聯結的問題。
如果,去看一下你的console上與Log中會看到類似以下的error,

The agent will now wait until it has registered with the server..


Cause: [org.rhq.core.clientapi.server.core.AgentRegistrationException:An agent is trying to register with an existing agent name [xxxx] without providing a valid security token. If you are attempting to re-register this agent, please consult an administrator to obtain the agent's proper security token and restart the agent with the option "-Drhq.agent.security-token=<the valid security token>"

這就是因為agent 身上的security token, 已經在重裝的時候被清掉了。
所以只要把token重新裝上去就好。如何安裝咧~

1. 先把Agent停下來。
2. 登入JON 的 server, 請記得這個登入的賬號要有安全設定的security 權限。
3. 按下最上方的Administrator, 左邊選單選擇Agent,找到你要重新安裝security token的agent名字。


4. 接下來的頁面就會有這個agent的資訊,請複製上面的security token.


5. 重新啓動你的agent, 執行的時候,加上  
-Drhq.agent.security-token=剛剛複製的securityToken


security token 就會重新安裝好了,以上。

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這個題目很多人叫我寫,可是這題目好大,這分明就是整死我咩~
所以我會分幾段慢慢寫。

JBoss 的 SubsystemDatasource WebWeb Service EJB Hibernate JMSJCAJVM 調校OS (作業系統)

先來看一下 DataSource Subsystem, DataSource 的部分主要是針對Connection Pool 做調校。

通常,程式都會需要跟資料庫界接,電腦在本機,尤其是在記憶體的運算很快,但是一旦要外部的資源連接,就是會非常的耗資源。所以現在的應用程式伺服器都會有個Pool 放一些先連接好的 資料庫connection,當程式有需要的時候就可以馬上提供,而不用花那些多餘的資源去連接資料庫。

這就是為什麼要針對Connection Pool 去做調校。

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Connection Pool 最多可以開啓的 connection 數量

prefill

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