[Lxc-users] Permissions on devpts in container

[John]

> Having further investigated this I agree it's a problem that lies
> outside LXC. I know this because I have reproduced the same problem on a
> test rig host (outside any containers). Thanks for replying to my
> question Serge.
Well I have found the problem and it is LXC-related (kind-of).

I have one container on my system that uses init instead of systemd, so 
its configuration is quite old. In its container config it still has 
explicit mounts for the system mounts:

lxc.mount.entry = none /srv/lxc/mycontainer/dev/pts devpts defaults 0 0
lxc.mount.entry = none /srv/lxc/mycontainer/dev/shm tmpfs defaults 0 0
lxc.mount.entry = none /srv/lxc/mycontainer/proc proc defaults 0 0
lxc.mount.entry = none /srv/lxc/mycontainer/sys sysfs defaults 0 0

I found that the container didn't work with these commented out, so I 
changed the devpts one to

lxc.mount.entry = none /srv/lxc/mycontainer/dev/pts devpts 
defaults,gid=5,mode=620,ptmxmode=000 0 0

and now it works but, at some point, I will update this container to use 
systemd.

Its interesting that this wasn't an issue before I updated but I think 
that has something to do with Arch Linux's adoption of glibc 2.18, whch 
removes pt_chown (but that's getting into stuff I don't know much about).

I am still puzzled how a container can effect changes on the host 
though... Is there some configuration that I should be doing to prevent 
this, but am perhaps not?
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