Date: Fri, 30 Mar 2012 11:15:55 -0700 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: Chris Rees <crees@freebsd.org> Cc: freebsd-current@freebsd.org, "C. P. Ghost" <cpghost@cordula.ws>, sthaug@nethelp.no Subject: Re: Using TMPFS for /tmp and /var/run? Message-ID: <20120330181555.GA78451@troutmask.apl.washington.edu> In-Reply-To: <CADLo83-c3jNd9XAyCMhqrEP3x9nvX1=Q9j7foEB37zRy3QZWDA@mail.gmail.com> References: <4F746F1E.6090702@mail.zedat.fu-berlin.de> <4F74BCE8.2030802@vangyzen.net> <CACM2%2B-7Ahn6J=CTASe0g48%2BSD2vvLVd_hG3DRZmvO31QszG5Xw@mail.gmail.com> <20120330.151848.41706133.sthaug@nethelp.no> <CADGWnjXj5W_UCHPExNjxHgq3EZHP1GwocnK4kOHLch5y3gNG0A@mail.gmail.com> <CADLo83-c3jNd9XAyCMhqrEP3x9nvX1=Q9j7foEB37zRy3QZWDA@mail.gmail.com>
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On Fri, Mar 30, 2012 at 05:56:06PM +0000, Chris Rees wrote: > On 30 March 2012 17:31, C. P. Ghost <cpghost@cordula.ws> wrote: > > On Fri, Mar 30, 2012 at 3:18 PM, <sthaug@nethelp.no> 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. > >>> > > >>> This is a mistake. > >>> > >>> The default should be clear_tmp_enable="YES" > >>> if only to uncover those broken configurations that expect /tmp to be > >>> persistent. > >> > >> If you want to break POLA and make a lot of people angry, sure. > >> Otherwise no. > > > > I couldn't agree more. Not clearing /tmp on reboot has been > > the norm for way too long and it is too late to change now. > > It's not just POLA, it also involves deleting data of unaware > > users, and that should be avoided. > > > > Anyone willing to change policy w.r.t. /tmp can do so on their > > own machines. Nothing is preventing them from doing so. > > But by changing defaults, one should err on the side of > > caution and remain conservative, IMHO. Well stated. > > >From man hier: > > /tmp/ temporary files that are not guaranteed to persist across > system reboots There is also a difference between "not guaranteed to persist" and knowingly blowing the files away by explictly clearing /tmp. PS: How many users of FreeBSD know that hier(7) exists? How many new users even know about man pages? -- Steve
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