差異處
這裏顯示兩個版本的差異處。
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java:servicewrapper:wrapperactionserver [2017/10/11 20:53] tony [WrapperActionServer] |
java:servicewrapper:wrapperactionserver [2023/06/25 09:48] |
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| - | {{tag>java Java_Service_Wrapper}} | ||
| - | ====== WrapperActionServer ====== | ||
| - | ===== Problem ===== | ||
| - | 某天有個運氣很好的同事，測試某個功能時，發生Service自己異常中止的問題。 | ||
| - | ===== How to resolve? ===== | ||
| - | ==== Trace ==== | ||
| - | 經過初步trace，發現那台機器被[[https://www.tenable.com/products/nessus-vulnerability-scanner|Nessus]]掃瞄過後，JVM就異常中止了: | ||
| - | <code> | ||
| - | ERROR | wrapper | 2017/10/06 16:42:16 | JVM exited unexpectedly. | ||
| - | </code> | ||
| - | 於是我將wrapper log level改為DEBUG，並打開了wrapper ping jvm的log: | ||
| - | <code> | ||
| - | wrapper.logfile.loglevel=DEBUG | ||
| - | wrapper.ping.alert.loglevel=DEBUG | ||
| - | </code> | ||
| - | 最後發現訊息出現: | ||
| - | <code> | ||
| - | INFO | jvm 1 | 2017/10/06 16:42:13 | WrapperManager: WARNING: Making JVM appear to be hung... | ||
| - | </code> | ||
| - | 這個問題看起來是Nessus連線讓wrapper造成jvm hang住。 | ||
| - | ==== WrapperActionServer ==== | ||
| - | 從WrapperActionServer的javadoc中得知，它可以綁定某個port提供以下功能: | ||
| - | <code> | ||
| - | S : Shutdown cleanly. | ||
| - | H : Immediate forced shutdown. | ||
| - | R : Restart | ||
| - | D : Perform a Thread Dump | ||
| - | U : Unexpected shutdown. (Simulate a crash for testing) | ||
| - | V : Cause an access violation. (For testing) | ||
| - | G : Make the JVM appear to be hung. (For testing) | ||
| - | </code> | ||
| - | 預設情況下是disable的；但假如你都設為enable，就會發生我們所遇到的慘劇。所以怎麼解決? 只要enable需要的功能即可。\\ | ||
| - | \\ | ||
| - | 其實我個人並不推薦使用wrapper這個功能，因為有心人士很容易就把你系統給搞掛了。 | ||
| - | ===== Reference ===== | ||
| - | * [[https://www.tenable.com/products/nessus-vulnerability-scanner|Nessus]] | ||
| - | * [[https://wrapper.tanukisoftware.com/doc/english/example.html|Running the TestWrapper Example Application]] | ||
| - | * [[https://wrapper.tanukisoftware.com/doc/english/prop-jvm-kill-delay.html|thread dump的問題]] | ||
| - | * [[https://wrapper.tanukisoftware.com/jdoc/org/tanukisoftware/wrapper/WrapperActionServer.html|javadoc - WrapperActionServer]] | ||
| - | ===== ===== | ||
| - | ---- | ||
| - | \\ | ||
| - | ~~DISQUS~~ | ||
