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Re: [Pulp-list] Avoid usage of '/tmp'



On 12/08/2011 06:17 AM, Jay Dobies wrote:
On 12/07/2011 03:11 PM, John Matthews wrote:
The issue of Grinder writing some data to /tmp/grinder and referring
to it in between runs came up during our SELinux policy rewrite. Dan
Walsh suggested we avoid using '/tmp/grinder' and instead switch to
'/var/run/grinder'. I wanted to share his blog post highlighting this
reason with the team.

http://danwalsh.livejournal.com/11467.html
<snippet from above>
"
Daemon developers should follow these rules:

/tmp is for users to store their stuff not for daemons or any process
that is started in the boot process.
If a daemon wants to communicate with a user then he should do it via
/var/run/DAEMON.
If you have a daemon that wants its temporarily files to survive a
reboot. consider using /var/cache/DAEMON
"

Pulp's BZ to fix this: https://bugzilla.redhat.com/show_bug.cgi?id=761173

What about making a new directory in /var/lib/pulp?

I don't want to break the conventions that Dan's mentioning, but we have
to think about situations where space on the root partition isn't
exactly in high availability.

Some of the cloud images we've seen have really small root partitions.
Some of the providers I've talked to have differences between the root
volume and the ones they've attached meant to serve Pulp content.

The RHUI installation conventions have been to mount a bunch of space at
/var/lib/pulp for repos. It'd be nice if we could have all of our space
requirements captured in that one case v. having to potentially have
them increase the availability for /var/run/pulp too (not sure the order
of magnitude of how much data grinder uses as temp space).

Both this and the SELinux compatibility question provide a strong rationale for using the Pulp-provided working directory in plugins rather than using /tmp directly.

I've created a corresponding BZ for PulpDist as well: https://bugzilla.redhat.com/show_bug.cgi?id=761257

Cheers,
Nick.

--
Nick Coghlan
Red Hat Engineering Operations, Brisbane


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