Re: Using /var/tmp instead of /tmp

[Jeff Morriss <jeff.morriss.ws () gmail com>]

Usually one uses TMPDIR to override the temporary directory.  Though that
doesn't work for setuid programs (as dumpcap often is).

On Fri, Jun 30, 2017 at 1:19 AM, Michał Łabędzki <
michal.tomasz.labedzki () gmail com> wrote:

> I also wonder why it is "/tmp" only. It should be configurable. It is
> not good idea Defaults to "/tmp".
> Or add option to easy start capture to destination file (not tmp file)
> - currently it is hidden in "capture options", but it may be more
> comfortable (in some cases) to have it available on capture start
> "click" I think about two buttons on toolbar? direct-tmp-file-version
> and ask-to-choose-file-before-start-version - also (text) field on
> welcome screen (to easy change save file name/path)?
>
> Why? Tmp file can be really big, it is easy to hurt OS (tmpfs).
>
> 2017-06-29 19:35 GMT+02:00 John Thacker <johnthacker () gmail com>:
> > On Thu, Jun 29, 2017 at 1:21 PM, Guy Harris <guy () alum mit edu> wrote:
> > > On Jun 29, 2017, at 3:48 AM, John Thacker <johnthacker () gmail com>
> wrote:
> > > > I believe the main reason is that Fedora defaults /tmp to tmpfs
> > > > (https://fedoraproject.org/wiki/Features/tmp-on-tmpfs) which thus
> limits it
> > > > to the size of RAM (half that, at default).
> > >
> > > Does Linux not have a *virtual* memory-based tmpfs, such as the one that
> > > Sun developed back in the late 1980's, allowing pages from temporary
> files
> > > either to be in memory or swap space?
> > Ah, to be correct, it is possible to set it to more than the amount of
> > physical RAM, and it will use swap at that point (see
> > https://www.kernel.org/doc/Documentation/filesystems/tmpfs.txt as well
> as
> > someone actually testing it
> > https://unix.stackexchange.com/questions/237030/how-safe-
> is-it-to-increase-tmpfs-to-more-than-physical-memory)
> > but it's set to a defined maximum at mount time and has to be remounted
> to
> > change. I've never actually set it to larger than my amount of RAM. I
> > suspect that Fedora simply found it easier to leave the default and then
> > change large files to use /var/tmp
> >
> > The Sun version was the inspiration; the old Linux ramfs that tmpfs
> replaced
> > was limited to the size of RAM, and thus not as flexible.
> >
> > John
> >
> > ____________________________________________________________
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>
> --
> Michał Łabędzki
> ____________________________________________________________
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