[Samba] Does CTDB run under LXC containers?

Peter Steele psteele at peaxy.net
Tue Aug 4 19:58:59 UTC 2015

I'm using libvirt_lxc and that has an XML based configuration. Based on 
what I've read, I think I need to add this to the ctdb container's config:

   <capabilities policy='default'>
     <sys_nice state='on'/>

That didn't do the trick though. I need to figure out how to turn on all 
caps to see if that does the job.


On 08/04/2015 10:27 AM, Ralph Böhme wrote:
> Hi Peter,
> On Tue, Aug 04, 2015 at 10:11:56AM -0700, Peter Steele wrote:
>> We're transitioning from a VM based environment to one that uses LXC based
>> containers running under CentOS 7. CTDB runs fine under our CentOS 7 VMs.
>> The same packages running under LXC however seem to have issues:
>> # systemctl start ctdb.service
>> Job for ctdb.service failed. See 'systemctl status ctdb.service' and
>> 'journalctl -xn' for details.
>> # systemctl status ctdb.service
>> ctdb.service - CTDB
>>     Loaded: loaded (/usr/lib/systemd/system/ctdb.service; disabled)
>>     Active: failed (Result: exit-code) since Tue 2015-08-04 10:09:06 PDT; 5s
>> ago
>>    Process: 9023 ExecStart=/usr/sbin/ctdbd_wrapper /run/ctdb/ctdbd.pid start
>> (code=exited, status=1/FAILURE)
>> Aug 04 10:09:04 pws-01 ctdbd[9031]: CTDB starting on node
>> Aug 04 10:09:04 pws-01 ctdbd[9032]: Starting CTDBD (Version 2.5.4) as PID:
>> 9032
>> Aug 04 10:09:04 pws-01 ctdbd[9032]: Created PID file /run/ctdb/ctdbd.pid
>> Aug 04 10:09:04 pws-01 ctdbd[9032]: Unable to set scheduler to SCHED_FIFO
>> (Operation not permitted)
> your container is dopping sys_nice cap, fix the container config. On
> my Fedora LXC host this is done in a global include that is pulled
> into all containers by default. I simply gave all caps to the
> containers intended for ctdb and then it worked just fine.
> -Ralph

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