问题描述
我想知道是否有任何方法可以从OOM杀手那里捕获Sigkill.我有一个任务队列，而且经常创建一个庞大的任务，该任务被OOM杀死.这个:
I was wondering if there was any way to catch the sigkill from the OOM killer. I have a task queue, and every so often a mammoth task is created that is killed by OOM. This:
catch Exception as ex:
# clean up!
不起作用，因为无法捕获SIGKILL.所以........ SIGKILL之后有什么策略可以清理吗?我可以分叉，并观察子进程吗?如果是这样，父进程必须事先知道子进程打开的任何资源?或者我可以做一些版本的
does not work, as SIGKILL can't be caught. So........is there ANY strategy to clean up after a SIGKILL? Can I fork, and watch the child process? If so, any resources opened by the child process would have to be known in advance by the parent? Or could I just do some version of
ps -ef | grep <child pid> | xargs kill -9 (you get the idea...)
当前，如果我在杀死OOM之后没有清理，我会留下很多子进程和其他事情，这些事情只会在重试任务时使情况变得更糟，并且很快，服务器将无法访问.
Currently, if I don't clean up after an OOM kill, I leave behind plenty of child processes and other things that just make it worse when the task is retried, and soon enough, the server is unreachable.
最后，只需这样做就可以了:
Finally, is it enough to just do:
kill -9 <process id>
要测试这种确切情况?
非常感谢！
推荐答案
SIGKILL本质上不能被捕获.
SIGKILL by its very nature cannot be trapped.
请参见 http://en.wikipedia.org/wiki/Unix_signal#SIGKILL :
SIGKILL信号被发送到进程以使其终止 立即(杀死).与SIGTERM和SIGINT相比，此信号不能 被捕获或忽略，并且接收过程无法执行任何操作 收到该信号后进行清理.
The SIGKILL signal is sent to a process to cause it to terminate immediately (kill). In contrast to SIGTERM and SIGINT, this signal cannot be caught or ignored, and the receiving process cannot perform any clean-up upon receiving this signal.
最好的做法是下次启动进程时，查找需要清理的所有内容.
The best thing to do is the next time your process launches, look for anything that needs to be cleaned up.
是的，kill -9 <pid>将向该进程发送一个SIGKILL. (确切地说，它发送第9个信号-恰巧SIGKILL在几乎每个系统上都具有数字9.您也可以编写kill -KILL <pid>，它使您可以通过名称而不是通过便携式方式通过数字来指定信号)
And yes, kill -9 <pid> will send a SIGKILL to the process. (To be precise, it sends the 9th signal - it just happens that SIGKILL has the number 9 on pretty much every system. You could alternatively write kill -KILL <pid>, which lets you specify the signal by name instead of by number in a portable way.)
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