[WBEL-users] tmpwatch command

Graham Purcocks grahamp@wsieurope.com
Wed, 15 Sep 2004 19:23:15 +0100

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If this uses RAM you are seriously in trouble of running out of memory 
if you write a lot to /tmp. I believe tmpfs was suggested for /var/run 
not /tmp. So be careful.

Kirby C. Bohling wrote:

> On Wed, Sep 15, 2004 at 11:35:17AM -0600, Jason Becker wrote:
>>Hi All,
>>My servers don't get rebooted very often but when they do I'd like /tmp 
>>to be cleared out. I really like the *BSD clear_tmp_enable (in rc.conf) 
>>method for doing this. Linux has tmpwatch. Would someone care to share 
>>there command line for a cron job?
> /etc/cron.daily/tmpwatch
> It's a standard part of most recent RedHat releases.
> If you really want to have it cleared, use tmpfs instead of a real
> filesystem (it'd be more real "UNIX" like from what I'm told).  I
> know someone just today replied with how well it works on the list.
> There is where I first read about it, it's written by the guy who
> started Gentoo:
> http://www-106.ibm.com/developerworks/library/l-fs3.html
> However, I'm told that tmpfs has caused weird problems in the past
> on several lists I'm on.  Essentially, using readdir while files are
> being added or removed might not work the way a standard filesystem
> does (the list isn't stable, so if a file "A" is removed, file "B"
> might show up via readdir twice, once before "A" was removed, and
> once after "A" was removed).  I'm not sure that it still exists, but
> I know that it caused problems for both BitKeeper and for
> Subversion.
> 	Don't ask, I don't get it.  I know that lots of people do this,
> but every once in a while it'll cause problems with applications.
> My personal best "/tmp", is that if /tmp is a softlink, on some
> versions of Linux Kernel/glibc you won't be able to change your
> crontab entry using vim as your editor.  There's some kind of race
> condition.  I've learned it's just best to just use a standard
> filesystem for it, and have a dedicate partition for it.
> 	Kirby
>>Jason Becker
>>Director & CEO
>>Coalescent Systems Inc.
>>Whitebox-users mailing list
> _______________________________________________
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> Whitebox-users@beau.org
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