[lxc-users] How to recover from ERROR state

[Christian Brauner]

> Kees Bakker <keesb at ghs.com> hat am 11. September 2018 um 15:13 geschrieben:
> 
> 
> Hey,
> 
> Every now and then we have one or more containers in state ERROR.
> Is there a clever method to recover from that, other than
> rebooting the LXD server?
> 
> Killing the monitor and the forkstart does help. And also a kworker
> process (kworker/u16:0) is eating up one of the CPUs with 100% load.
> lxc info gives "error: Monitor is hung"

If I'm not mistaken this is usually caused by a hanging lxc-monitord
process which older LXC versions still use and which is removed in 
newer LXC versions.
Can you check whether you see a lxc-monitord process when such a hang
happens. If so, kill it. Afterwards things should work fine again.

> 
> I'm running Ubuntu 16.04 with BTRFS. The kernel is 4.15.0-33-generic


Cc stgraber since I don't have in mind what LXC version is used
and if it is one that has already gotten rid of lxc-monitord.

Christian