[Pkg-net-snmp-devel] Bug#718702: dpkg: start-stop-daemon refuses to start on host when same process is running in a LXC container

[Guillem Jover]

Control: reassign -1 snmpd
Control: forcemerge 611668 -1

[ Sending through NNNN-submitter at b.d.o because your mail server
  rejected my initial reply… ]

On Sun, 2013-08-04 at 19:56:38 +0200, Guillem Jover wrote:
> Hi!
> 
> On Sun, 2013-08-04 at 16:28:15 +0100, Glen Pitt-Pladdy wrote:
> > Package: dpkg
> > Version: 1.16.10
> > Severity: normal
> 
> > I noticed services not starting at boot and failed to start when manually
> > started via init scripts. On further investigation this appears S-S-D
> > interacts badly with LXC containers.
> > 
> > To illistrate, when a daemon is running in an LXC container, S-S-D
> > believes it is already running on the host, hence when refuses to
> > start them. For example, manually executing (with --verbose) the
> > same as happens in the snmpd init script:
> 
> It believes so, because it's told to match only on the exec name,
> which it does and finds and operates on every and each instance of
> the executable found on the system. The init script should be more
> specific to avoid this kind of issue.
> 
> > # start-stop-daemon --verbose --start --oknodo --exec /usr/sbin/snmpd \
> >   -- -LS n d -Lf /dev/null -u snmp -g snmp -I -smux -p /var/run/snmpd.pid
> > /usr/sbin/snmpd already running.
> 
> Notice how the pid file is only passed to the daemon (after --), but
> not to s-s-d.
> 
> > While this may not affect a large proportion of users, it risks
> > crippling the host system if critical services start on a container
> > before the host at boot.
> 
> So, this is really not a problem with s-s-d, but with the specific
> init script. If that script is part of Debian, then we should reassign
> the bug report, otherwise if it's a local init script you'd need to
> fix that and I'd just close the bug report.

This problem exists in Debian, and has already been filed before,
reassigning.

Thanks,
Guillem