[pkg-lxc-devel] Bug#824779: container getty-static.service causes lxcfs high cpu usage

[Martin Pitt]

Hello Michael, Evgeni,

Evgeni Golov [2016-07-18  7:25 +0200]:
> > > There is no point in even wasting four getty processes on tty1-4 in
> > > LXC -- containers are not meant to have gettys on ttys in the first
> > > place. I committed a fix to git for that.
> > > (ConditionVirtualization=!container)
> 
> this will break lxc-console, but more later :)

console-getty.service suffices for that -- this is running in
containers. Interestingly I also have container-getty@{0,..3}.service
running. "lxc-start -n mycontainer -F" also works, i. e. you see the
boot messages.

> > I just created a test jessie lxc container (using lxc 2.0.0-3~bpo8+1) on
> > jessie host system (using lxc-create -t download)
> 
> -t debian please, -t download will download an image from
> linuxcontainers.org, which might or might not be the same as -t debian.
> (AFAIK it is almost identical, but please don't file bugs if it isn't
> ;))

The "download" images are built from the exact same templates. Using
the "debian" template will do the exact same things, check
/usr/share/lxc/templates/lxc-debian . This has those modifications.

I do remember that Stèphane Graber (LXC upstream) was bugging me about
fixing sigpwr.target in systemd proper
(https://lists.linuxcontainers.org/pipermail/lxc-users/2015-May/009279.html
and https://launchpad.net/bugs/1457321), the udev stuff isn't
necessary at all as udev will already not start in LXC due to
ConditionPathIsReadWrite=/sys, and the getty modifications should now
be obsolete too.

The lxc-ubuntu template does none of these modifications, and it works
fine. So indeed they should be dropped from the lxc-debian template as
well. (This should be done upstream).

Martin

-- 
Martin Pitt                        | http://www.piware.de
Ubuntu Developer (www.ubuntu.com)  | Debian Developer  (www.debian.org)