[Lxc-users] Executing a command inside a running container?

Serge E. Hallyn serue at us.ibm.com
Sun Jan 31 21:15:48 UTC 2010

Quoting Michael H. Warfield (mhw at WittsEnd.com):
> On Sat, 2010-01-30 at 14:20 +0100, Dominik Schulz wrote: 
> > Hi,
> > 
> > I'm fairly new to LXC and I am looking for a way to execute a command inside a 
> > running container (a full blow one with its own rootfs and full isolation). 
> > lxc-execute doesn't seem to do the trick and lxc-console requires credential 
> > to login. I'm looking for a way to execute command w/o having to login via ssh 
> > or the lxc-console, so I can execute command directly inside the containers to 
> > shut them down properly.
> This is being worked on and looked at now through the use of some sort
> of daemon in the running container but is not currently possible.  More
> over, cgroups in the kernel does not currently support joining an active
> cgroup, and may never support it, so it would have to be done through

Just to be clear, it's the namespaces, not the cgroups, which don't
allow this.  We've floated 'sys_hijack' a few times as a way to create
a child which actually inherits its namespaces from a different specified
task, which would give you what you need, but it's a tough sell since
userspace can work around it.

> the mediation of some sort of daemon in the running container and
> communicating with the host.  There's been discussion on the -devel list
> over the optimal way to do it and there are some patches running around
> but AFAICT nothing has really been committed or committed to at this
> time.
> 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
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