Date: Thu, 24 Feb 2005 13:12:00 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Paul Richards <paul.richards@gmail.com> Cc: questions@freebsd.org Subject: Re: Cleaning /tmp on boot Message-ID: <20050224131200.GA16494@gravitas.thebunker.net> In-Reply-To: <a1138db305022404423f7afde4@mail.gmail.com> References: <a1138db305022404423f7afde4@mail.gmail.com>
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On Thu, Feb 24, 2005 at 12:42:17PM +0000, Paul Richards wrote:
> Is there an easy way to have FreeBSD (RELEASE-5.3) clean /tmp on boot
> by means of setting a flag or something in /etc/rc.conf? I'd like to
> check before I start manually hacking up my boot scripts to get this
> done.
Add:
clear_tmp_enable=3D"YES"
to /etc/rc.conf. Also consider 'daily_clean_tmps_enable=3D"YES"' in
/etc/periodic.conf, which will enable a daily job to clean out old
files from temporary directories.
=20
> Alternatively, is there something similar to tmpfs from Linux
> available on FreeBSD? I've heard about mfs but it statically
> allocates memory from the VM, I'd prefer if allocation was done only
> as needed on demand.
Yes -- correct, it is called 'mdmfs' under 5.x -- but it isn't
necessarily true that it allocates memory out of VM: depending on the
arguments used when configuring the underlying md(4) device, the
memory can be swap or file backed. When it's used to provide a /tmp
filesystem, it is specifically swap backed. As is explained in the
mdmfs(8) man page. Add the following to /etc/rc.conf to enable using a
memory filesystem for /tmp:
tmpmfs=3D"YES"
tmpsize=3D"128m"
=20
Note that tmpsize should be smaller than the amount of swap space on
your machine -- preferably quite a bit smaller -- or you can end up
with a situation where any user can potentially DoS your server simply
by creating files under /tmp
Cheers,
Matthew =20
--=20
Dr Matthew J Seaman MA, D.Phil. 8 Dane Court Manor
School Rd
PGP: http://www.infracaninophile.co.uk/pgpkey Tilmanstone
Tel: +44 1304 617253 Kent, CT14 0JL UK
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