Hi, /var/lib contains a huge load of stuff that is not supposed to change between boots, like dpkg's state (package selections), the calibration constants for the clock, etc.
In general, these days, putting any system partitions besides /var and /home
(and maybe /boot) on a different device is just asking for problems without
benefit. And the benefits of /var are slim, as Debian doesn't really support
readonly rootfs well.
Cheers,
Sebastian
On Mon, Oct 22, 2018 at 03:37:45PM +0200, Michael wrote:
> Matus,
>
> I don't totally need to make /var a tmpfs, it's just out of curiosity, and
> for the simplicity of configuration. Since /var/cache and /var/log are
> already tmpfs for me, and this extendet tmpfs setup works fine since at least
> 2 years, it seems to be interesting to check the other top folders of /var
> for that option too.
>
> > On 22.10.18 10:02, Michael wrote:
> > >Recently made a lot of stuff tmpfs (like /tmp and /var/cache and
> > >$HOME/.cache) and i'm not sure about this ...:
> > >
> > >Is there any reason why /var cannot be completely tmpfs ?
> >
> > /var contains huge amount of data that keep changing but must not be lost.
>
> ok, but shouldn't /var contain no configuration-like files ? In other words,
> are these all files to read or are they just only re-created everytime, thus
> only to write ? If so, then perhaps could i live with some extra time for
> starting services / apps to re-create things (if it's only within a second).
>
> For example, here are my /var topfolders:
>
> apt -> empty
> backups -> write-only; and i did never need these in about 15 years, so
> i guess i can live without.
> cache -> already tmpfs
> lib -> don't know XXX
> local -> empty
> lock -> only a lockfile
> log -> already tmpfs for me (if i ever need persistent logs, for
> specific reason, i'll just revert it. It's a desktop machine, rarely
> problems.)
> mail -> don't need
> opt -> empty
> run -> already tmpf via Debian
> spool -> cron/anacron, cups .... i guess, no need for persistent
> tmp -> empty
> www -> not used here
>
> That leaves /var/lib as a main candidate for problems, because i don't know
> the usage of what is stored here.
>
>
>
> ps. About /var/cache/apt, it is mounted as separate 5G partition. /tmp
> already is made tmpfs.
>
--
Best regards, | Theoretische Physik 1, 02.573
Sebastian Kapfer | FAU Erlangen
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