[lxc-users] Nested containers (cont'd)

[Serge Hallyn]

Quoting Nels Nelson (nels.n.nelson at gmail.com):
> Serge, et al,-
> 
> I was able to get the inner container started after I did two things.
> 
> First, I set this option in every container config:
> 
>     lxc.mount.auto = cgroup

Excellent.

> Second, I create the directory /lib/var/lxc in each container in which I
> created another nested container.
> 
> There is still a strange issue where starting a nested container with a
> command like bash fails to put me into a functioning console.  The inner
> container seems to work at first, but then hangs when a command is entered.
> 
> # lxc-create -n outer -t minimal
> # lxc-start -n outer -- bash
> bash: cannot set terminal process group (-1): Inappropriate ioctl for device
> bash: no job control in this shell
> bash-4.2# mkdir /var/lib/lxc
> bash-4.2# lxc-create -n inner -t minimal
> bash-4.2# lxc-start -n inner -- bash
> bash: cannot set terminal process group (-1): Inappropriate ioctl for device
> bash: no job control in this shell
> bash-4.2# ls
> <seems to hang><enter key>
> lxc-start: Input/output error - failed to read
> <seems to hang>
> 
> To work-around this, I had to start each container as a daemon, and without
> a bash command.
> 
> # lxc-start -n outer -d
> # lxc-attach -n outer -- bash
> bash-4.2#
> 
> And then that weird "cannot set terminal process group (-1): Inappropriate
> ioctl for device" error stopped showing up.

That's expected.  If you want to just run a shell, use lxc-execute.

-serge