Re: [gentoo-user] lxc filling /dev

[William Kenworthy]

Thank Rich,

    It seems to be tty12 (console logging) - I think disabling it in
syslog-ng will be easiest but will do some testing first.

The recursive switch shows tty12 regularly ticking up.

BillK


On 17/2/20 10:13 am, Rich Freeman wrote:
> On Sun, Feb 16, 2020 at 7:57 PM William Kenworthy <billk@×××××××××.au> wrote:
>> 2 ~ # lxc-attach -n mail -- bash -c "df -h"
>> none                            492K  320K  172K  66% /dev
>> du and ls -al do not give any clues, the host /dev is normal and all
>> running lxc instances do it, but at different rates
> Are you running ls -al from INSIDE the container?  If you're running
> it on the host you won't see anything because it is almost certainly
> in a separate mount namespace, and so it is invisible from the host.
> In particular, any files you see in rootdir/dev from the host are NOT
> visible in the container, and vice-versa.
>
> I don't use lxc, but if I had to take a wild guess your /dev isn't
> being properly initialized inside, and some typical device node is
> being created as a regular file and stuff like "echo foo > /dev/null"
> is actually writing to a real file there, filling up the tmpfs.
>
> Try:
> lxc-attach -n mail -- bash -c "ls -l --recursive /dev"
>
> Or launch an interactive shell inside the container and just poke
> around in there.  I have no idea what the "lxc way" to launch a shell
> is, but you can always use:
> nsenter --target <pid> --all /bin/bash
> (where <pid> is the pid on the host of a process inside the container)
>
> nsenter is part of util-linux
>