[Lxc-users] [systemd-devel] Unable to run systemd in an LXC / cgroup container.

[Michael H. Warfield]

Adding in the lxc-devel list.

On Thu, 2012-10-25 at 22:59 -0400, Michael H. Warfield wrote:
> On Thu, 2012-10-25 at 15:42 -0400, Michael H. Warfield wrote:
> > On Thu, 2012-10-25 at 14:02 -0500, Serge Hallyn wrote:
> > > Quoting Michael H. Warfield (mhw at WittsEnd.com):
> > > > On Thu, 2012-10-25 at 13:23 -0400, Michael H. Warfield wrote:
> > > > > Hey Serge,
> > > > > 
> > > > > On Thu, 2012-10-25 at 11:19 -0500, Serge Hallyn wrote:
> > > > 
> > > > ...
> > > > 
> > > > > > Oh, sorry - I take back that suggestion :)
> > > > > 
> > > > > > Note that we have mount hooks, so templates could install a mount hook to
> > > > > > mount a tmpfs onto /dev and populate it.
> > > > > 
> > > > > Ok...  I've done some cursory search and turned up nothing but some
> > > > > comments about "pre mount hooks".  Where is the documentation about this
> > > > > feature and how I might use / implement it?  Some examples would
> > > > > probably suffice.  Is there a require release version of lxc-utils?
> > > > 
> > > > I think I found what I needed in the changelog here:
> > > > 
> > > > http://www.mail-archive.com/lxc-devel@lists.sourceforge.net/msg01490.html
> > > > 
> > > > I'll play with it and report back.
> > 
> > > Also the "Lifecycle management hooks" section in
> > > https://help.ubuntu.com/12.10/serverguide/lxc.html
> > 
> > This isn't working...
> > 
> > Based on what was in both of those articles, I added this entry to
> > another container (Plover) to test...
> > 
> > lxc.hook.mount = /var/lib/lxc/Plover/mount
> > 
> > When I run "lxc-start -n Plover", I see this:
> > 
> > [root at forest ~]# lxc-start -n Plover
> > lxc-start: unknow key lxc.hook.mount
> > lxc-start: failed to read configuration file
> > 
> > I'm running the latest rc...
> > 
> > [root at forest ~]# rpm -qa | grep lxc
> > lxc-0.8.0.rc2-1.fc16.x86_64
> > lxc-libs-0.8.0.rc2-1.fc16.x86_64
> > lxc-doc-0.8.0.rc2-1.fc16.x86_64
> > 
> > Is it something in git that hasn't made it to a release yet?

> nm...  I see it.  It's in git and hasn't made it to a release.  I'm
> working on a git build to test now.  If this is something that solves
> some of this, we need to move things along here and get these things
> moved out.  According to git, 0.8.0rc2 was 7 months ago?  What's the
> show stoppers here?

While the git repo says 7 months ago, the date stamp on the
lxc-0.8.0-rc2 tarball is from July 10, so about 3-1/2 months ago.
Sounds like we've accumulated some features (like the hooks) we are
going to need like months ago to deal with this systemd debacle.  How
close are we to either 0.8.0rc3 or 0.8.0?  Any blockers or are we just
waiting on some more features?

> > > Note that I'm thinking that having lxc-start guess how to fill in /dev
> > > is wrong, because different distros and even different releases of the
> > > same distros have different expectations.  For instance ubuntu lucid
> > > wants /dev/shm to be a directory, while precise+ wants a symlink.  So
> > > somehow the template should get involved, be it by adding a hook, or
> > > simply specifying a configuration file which lxc uses internally to
> > > decide how to create /dev.
> 
> > I agree this needs to be by some sort of convention or template that we
> > can adjust.
> > 
> > > Personally I'd prefer if /dev were always populated by the templates,
> > > and containers (i.e. userspace) didn't mount a fresh tmpfs for /dev.
> > > But that does complicate userspace, and we've seen it in debian/ubuntu
> > > as well (i.e. at certain package upgrades which rely on /dev being
> > > cleared after a reboot).
> > > 
> > > -serge
> > 
> > Regards,
> > Mike
-- 
Michael H. Warfield (AI4NB) | (770) 985-6132 |  mhw at WittsEnd.com
   /\/\|=mhw=|\/\/          | (678) 463-0932 |  http://www.wittsend.com/mhw/
   NIC whois: MHW9          | An optimist believes we live in the best of all
 PGP Key: 0x674627FF        | possible worlds.  A pessimist is sure of it!
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