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Re: /var tmpfs ?

On 22.10.18 15:37, Michael wrote:
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

e.g. /var/lib/mysql where mysql databases reside. don't remove.
also /var/lib/dpkg contains information about installed packages. Don't
remove unlesas you want to seriously break your system.

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

crontabs, mail queues, also something no to lose.

tmp		-> empty

fiels stored there are temporary, but to be preserved across reboots.

That leaves /var/lib as a main candidate for problems, because i don't know the usage of what is stored here.

every time you install a package, it may use /var for something you wouldn't
be happy wen losing.
Simply said, don't use tmpfs for /var. Maybe concrete separate
subdirectories, but better none than sorry.

Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
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