Re: [libvirt] What is the robust/recommended way to retrieve the PID of a VM's init process ?

On Mon, Jan 20, 2014 at 06:53:28PM +0100, Thierry Parmentelat wrote: > Hi > > Well if I need to run anything in the container context, short of entering > it through e.g. ssh - hoping this is properly set up - well, I can’t.. > > I am using libvirt / lxc to set up a build box; essentially every night > I would spawn a set of fresh VMs of some flavours (fedora18, ubuntu, > what not) and use this to rebuild my system from scratch > In this context it’s a real hassle to have to even set up ssh, there is > no good reason for the build VM to run an ssh service at all, and I am > concerned it might pull dependencies that I do not need/want > I’d much rather have a direct means to just run some command inside the container. > > Admittedly I’m brain-damaged after having used vservers for too long, and their > ‘vserver <container> exec command to run’ feature is in my genes now ;) > > Now maybe I am the one who is missing something and there already is something to do that ? > Using the trick below I essentially have what I need mind you, I’m just concerned that it > kind of works by accident :-) Yes, it already exists, albeit as a lxc specific custom command/api: $ virsh lxc-enter-namespace $CONTAINER /path/to/command/to/run arg1 arg2... There's a corresponding API in the libvirt-lxc.so library virDomainLxcEnterNamspace Eventually we'll turn this into a proper libvirt API with a less sucky virsh command name.