[Bug 1075717] Re: mounted-dev must not re-create consoles in a container
Stéphane Graber
stgraber at stgraber.org
Wed Jan 21 18:00:03 UTC 2015
This needs fixing in precise too. I just ran into that very problem with
current upstream LXC and a precise privileged container.
I'll upload a straight cherry-pick of the mounted-dev.conf job as we
have it nowadays (I confirmed that fixes it here).
** Also affects: lxc (Ubuntu Precise)
Importance: Undecided
Status: New
** Also affects: mountall (Ubuntu Precise)
Importance: Undecided
Status: New
** Changed in: lxc (Ubuntu Precise)
Status: New => Invalid
** Changed in: mountall (Ubuntu Precise)
Status: New => Triaged
** Changed in: mountall (Ubuntu Precise)
Assignee: (unassigned) => Stéphane Graber (stgraber)
** Changed in: mountall (Ubuntu Precise)
Importance: Undecided => High
** Description changed:
mounted-dev.conf always does MAKEDEV console. MAKEDEV doesn't just make
the devices, it first removes them.
When a container starts, it sets up /dev/console and /dev/lxc[1-4] as
bind mounts of ptys on the host, for use as lxc consoles. If mounted-
dev deletes and recreates those, then none of the lxc consoles work.
A simple patch which stops it from breaking lxc consoles is at lp
:~serge-hallyn/ubuntu/quantal/mountall/mountall-lxc . However looking
back at it, I think it would be ok to do a further check for whether
/dev/console exists. If it does not exist, then MAKEDEV console anyway.
This isn't necessary, just a thought.
+
+
+ == SRU ==
+ === Rationale ===
+ This bug was fixed in trusty but still affects precise LXC containers that are brought up with /dev mounted as something other than a devtmpfs (which is the case with LXC 1.1).
+
+ === Test case ===
+ - Install LXC 1.1 (from ppa:ubuntu-lxc/daily or in a few days, from vivid)
+ - sudo lxc-create -t download -n precise -- -d ubuntu -r precise -a amd64
+ - sudo lxc-start -n precise -F
+
+ That will hang at a blank screen even though the container is
+ functional.
+
+ - sudo lxc-attach -n precise -- apt-get dist-upgrade -y
+ - sudo lxc-attach -n precise -- reboot
+
+ And at that point, getty should show up fine in the lxc-start shell.
+
+ === Regression potential ===
+ Not expecting any, the change is straightforward and has been in Ubuntu since raring.
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https://bugs.launchpad.net/bugs/1075717
Title:
mounted-dev must not re-create consoles in a container
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