[lxc-users] /proc lost in some containers

[Tomasz Chmielewski]

On 2018-11-09 11:19, Stéphane Graber wrote:
> On Fri, Nov 09, 2018 at 04:29:46AM +0900, Tomasz Chmielewski wrote:
>> LXD 3.6 from a snap on an up-to-date Ubuntu 18.04 server:
>> 
>> lxd   3.6        9510  stable    canonical✓  -
>> 
>> 
>> Suddenly, some (but not all) containers lost their /proc filesystem:
>> 
>> # ps auxf
>> Error: /proc must be mounted
>>   To mount /proc at boot you need an /etc/fstab line like:
>>       proc   /proc   proc    defaults
>>   In the meantime, run "mount proc /proc -t proc"
>> 
>> #
>> 
>> 
>> I think I've seen something similar like this in the past.
>> Can it be attributed to some not-so-well automatic snap upgrades?
> 
> That can either be a lxcfs crash or lxcfs bug of some kind.
> 
> Can you show "ps fauxww | grep lxcfs" on the host.

Hmm, running twice?

root      85202  0.0  0.0 382524  1236 ?        S<l  Sep24   9:37 lxcfs 
/var/snap/lxd/common/var/lib/lxcfs -p /var/snap/lxd/common/lxcfs.pid
root      19414  0.0  0.0 530260  1716 ?        S<l  Oct05   3:03 lxcfs 
/var/snap/lxd/common/var/lib/lxcfs -p /var/snap/lxd/common/lxcfs.pid


> And then inside an affected container run "grep lxcfs /proc/mounts" and
> for each of the /proc path listed, attempted to read them with "cat",
> that should let you check if it's just one lxcfs file that's broken or
> all of them.

Unfortunately I've already stopped / started all affected containers.


Tomasz Chmielewski
https://lxadm.com