topic Re: Catch automatically new files in a particular folder in Operating System - Linux

Catch automatically new files in a particular folder

Leo The Cat — Wed, 25 Mar 2009 12:11:23 GMT

Hi Guys

I've another small affair.
How to catch any new core file in my folder /wrk/files ?

I'd like to trigger actions when core file is coming. Of course I can do this we a crontab and check if a new file is arrived from the last check but the problem is that in a minute many core will arrived and the risk is to missed some files ! The last core file is always overwriten and I want to have all files. So I need first to rename the file...

Any Idea ?

Bests Regards
Den

Re: Catch automatically new files in a particular folder

Ivan Ferreira — Wed, 25 Mar 2009 13:05:25 GMT

The first I can think is a versioning file system:

http://en.wikipedia.org/wiki/Versioning_file_system

Another very more complex option is to enable auditing. After an event for that file is detected, use swatch to trigger an action.

But remember, keep it simple and it will work.

Re: Catch automatically new files in a particular folder

smatador — Wed, 25 Mar 2009 15:51:46 GMT

Hi,

I never use for this task but maybe you could implement rsync daemon with some configuration tasks like backup for renaming your core file.

Re: Catch automatically new files in a particular folder

Thierry D — Thu, 26 Mar 2009 09:03:08 GMT

Hi Leo,

You could have a look at incron, which is a kind of cron but based on file system event and not time event.

http://inotify.aiken.cz/?section=incron&page=about〈=en

Cheers
Thierry

Re: Catch automatically new files in a particular folder

Dennis Handly — Sat, 28 Mar 2009 01:02:33 GMT

>How to catch any new core file in my folder /wrk/files?

Shouldn't you be trying to find why you have so many?
If linux had coreadm, you could have them moved elsewhere and with unique names.

Re: Catch automatically new files in a particular folder

Srimalik — Sat, 28 Mar 2009 04:28:15 GMT

you can use dnotify/inotify theese function allow you to monitor changes to your filesystem.

Not sure if a pre-written tool is available for which alllows you to directly specify directory names to monitor on command line.

You may have to write C program using these APIs

Thanks
Sri

Re: Catch automatically new files in a particular folder

Jeroen Peereboom — Sat, 28 Mar 2009 08:39:35 GMT

L.S.

not really an answer to your question, but I agree with Dennis: solve the problem or have it solved.

Why is it so important not to miss a single core file?

JP

Re: Catch automatically new files in a particular folder

Srimalik — Sat, 28 Mar 2009 08:44:09 GMT

you can set 1 in /proc/sys/kernel/core_uses_pid so that every core file is appended with the pid of the dumping process.

Re: Catch automatically new files in a particular folder

Jeroen Peereboom — Sun, 29 Mar 2009 08:45:06 GMT

Well,

that's a nice, easy solution of Srikrishan.

JP