Thanks for submitting this bug. The problem is due to /run/shm not
existing in the cloud images.
The ubuntu-cloud image fixes the /dev/shm by doing:
if [ ! -L $rootfs/dev/shm ] && [ -d $rootfs/run/shm ] && [ -e
$rootfs/dev/shm ]; then
mv $rootfs/dev/shm $rootfs/dev/shm.bak
ln -s /run/shm $rootfs/dev/shm
fi
The second test fails because $rootfs/run/shm does not exist.
Since /run/shm will be created at runtime, I see no reason not to drop the
second part
of the test. I'll suggest that to the list - there may be reasons I'm not
considering.
** Summary changed:
- Permission denied when creating semaphore in container
+ Permission denied when creating semaphore in ubuntu-cloud container
** Changed in: lxc (Ubuntu)
Importance: Undecided => High
** Changed in: lxc (Ubuntu)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/1353734
Title:
Permission denied when creating semaphore in ubuntu-cloud container
Status in “lxc” package in Ubuntu:
Triaged
Bug description:
Deployed a precise host on canonistack, then a precise container inside that
host:
andreas@nsn7:~$ juju status
environment: andreas-canonistack2
machines:
"0":
agent-state: started
agent-version: 1.20.3
dns-name: 10.55.32.177
instance-id: b898eee8-9aef-4e6c-9749-dce73f490dc6
instance-state: ACTIVE
series: precise
containers:
0/lxc/0:
agent-state: started
agent-version: 1.20.3
dns-name: 10.0.3.118
instance-id: juju-machine-0-lxc-0
series: precise
hardware: arch=amd64
hardware: arch=amd64 cpu-cores=1 mem=1024M root-disk=10240M
state-server-member-status: has-vote
services:
ubuntu-precise:
charm: cs:precise/ubuntu-4
exposed: false
units:
ubuntu-precise/0:
agent-state: started
agent-version: 1.20.3
machine: 0/lxc/0
public-address: 10.0.3.118
Test script:
andreas@nsn7:~$ juju ssh ubuntu-precise/0 'python -c "from multiprocessing
import synchronize; synchronize.Lock()"'
Warning: Permanently added '10.55.32.177' (ECDSA) to the list of known hosts.
Warning: Permanently added '10.0.3.118' (ECDSA) to the list of known hosts.
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib/python2.7/multiprocessing/synchronize.py", line 147, in
__init__
SemLock.__init__(self, SEMAPHORE, 1, 1)
File "/usr/lib/python2.7/multiprocessing/synchronize.py", line 75, in
__init__
sl = self._semlock = _multiprocessing.SemLock(kind, value, maxvalue)
OSError: [Errno 13] Permission denied
Connection to 10.0.3.118 closed.
ERROR subprocess encountered error code 1
On the precise host:
root@juju-andreas-canonistack2-machine-0:~# ls -la /dev/shm
lrwxrwxrwx 1 root root 8 Aug 6 21:51 /dev/shm -> /run/shm
root@juju-andreas-canonistack2-machine-0:~# grep shm /proc/mounts
none /run/shm tmpfs rw,nosuid,nodev,relatime 0 0
root@juju-andreas-canonistack2-machine-0:~# dpkg-query -W sysvinit-utils lxc
lxc 1.0.0~alpha1-0ubuntu14.1~ctools0
sysvinit-utils 2.88dsf-13.10ubuntu11.1
On the precise container:
root@juju-machine-0-lxc-0:~# ls -la /dev/shm
total 8
drwxr-xr-x 2 root root 4096 Jul 17 07:05 .
drwxr-xr-x 6 root root 4096 Aug 6 22:19 ..
root@juju-machine-0-lxc-0:~# grep shm /proc/mounts
none /run/shm tmpfs rw,nosuid,nodev,relatime 0 0
root@juju-machine-0-lxc-0:~#
Both are precise 12.04.5. The host was image b898eee8-9aef-
4e6c-9749-dce73f490dc6 from canonistack's lcy02 region.
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