Date: Thu, 29 Mar 2012 15:52:16 -0500 From: Eric van Gyzen <eric@vangyzen.net> To: David Wolfskill <david@catwhisker.org>, current@freebsd.org Subject: Re: Using TMPFS for /tmp and /var/run? Message-ID: <4F74CB80.2030207@vangyzen.net> In-Reply-To: <20120329195800.GH1709@albert.catwhisker.org> References: <4F746F1E.6090702@mail.zedat.fu-berlin.de> <4F74BCE8.2030802@vangyzen.net> <20120329195800.GH1709@albert.catwhisker.org>
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On 03/29/2012 14:58, David Wolfskill wrote: > On Thu, Mar 29, 2012 at 02:50:00PM -0500, Eric van Gyzen wrote: >> ... >> However, if you always want to use tmpfs instead of stable storage, >> please do not. Some people expect /tmp to be persistent. This is why >> /etc/defaults/rc.conf has clear_tmp_enable="NO". Changing this would >> break the POLA. >> ... > > Errr... I'm not sure why folks might have that misguided expectation; Because that's how the default installation has behaved for a long time. I'm not saying this expectation is /wise/; I'm just saying some people have formed that expectation by observing the behavior of the default system, and they would be astonished by this change. > from hier(7): > > /tmp/ temporary files that are not guaranteed to persist across sys- > tem reboots > > Foplks are welcome to do whatever they wish with their own machines, > but the FreeBSD default is as above. Respectfully, no. The default is to store /tmp in UFS, either in its own partition (with Auto Defaults) or in / (if no partition was created for it), and to refrain from clearing it at boot. Thus, although /tmp is not guaranteed to persist in theory, it is rather persistent in practice. My only point is: carefully consider the change in behavior of the default installation before breaking the POLA. Eric
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