[ClusterLabs] drbd clone not becoming master

[Dennis Jacobfeuerborn]

On 02.11.2017 23:08, Dennis Jacobfeuerborn wrote:
> Hi,
> I'm setting up a redundant NFS server for some experiments but almost
> immediately ran into a strange issue. The drbd clone resource never
> promotes either of the to clones to the Master state.
> 
> The state says this:
> 
>  Master/Slave Set: drbd-clone [drbd]
>      Slaves: [ nfsserver1 nfsserver2 ]
>  metadata-fs	(ocf::heartbeat:Filesystem):	Stopped
> 
> The resource configuration looks like this:
> 
> Resources:
>  Master: drbd-clone
>   Meta Attrs: master-node-max=1 clone-max=2 notify=true master-max=1
> clone-node-max=1
>   Resource: drbd (class=ocf provider=linbit type=drbd)
>    Attributes: drbd_resource=r0
>    Operations: demote interval=0s timeout=90 (drbd-demote-interval-0s)
>                monitor interval=60s (drbd-monitor-interval-60s)
>                promote interval=0s timeout=90 (drbd-promote-interval-0s)
>                start interval=0s timeout=240 (drbd-start-interval-0s)
>                stop interval=0s timeout=100 (drbd-stop-interval-0s)
>  Resource: metadata-fs (class=ocf provider=heartbeat type=Filesystem)
>   Attributes: device=/dev/drbd/by-res/r0/0 directory=/var/lib/nfs_shared
> fstype=ext4 options=noatime
>   Operations: monitor interval=20 timeout=40
> (metadata-fs-monitor-interval-20)
>               start interval=0s timeout=60 (metadata-fs-start-interval-0s)
>               stop interval=0s timeout=60 (metadata-fs-stop-interval-0s)
> 
> Location Constraints:
> Ordering Constraints:
>   promote drbd-clone then start metadata-fs (kind:Mandatory)
> Colocation Constraints:
>   metadata-fs with drbd-clone (score:INFINITY) (with-rsc-role:Master)
> 
> Shouldn't one of the clones be promoted to the Master state automatically?

I think the source of the issue is this:

Nov  2 23:12:03 nfsserver1 drbd(drbd)[4673]: ERROR: r0: Called
/usr/sbin/crm_master -Q -l reboot -v 10000
Nov  2 23:12:03 nfsserver1 drbd(drbd)[4673]: ERROR: r0: Exit code 107
Nov  2 23:12:03 nfsserver1 drbd(drbd)[4673]: ERROR: r0: Command output:
Nov  2 23:12:03 nfsserver1 lrmd[2163]:  notice:
drbd_monitor_60000:4673:stderr [ Error signing on to the CIB service:
Transport endpoint is not connected ]

It seems the drbd resource agent tries to use crm_master to promote the
clone but fails because it cannot "sign on to the CIB service". Does
anybody know what that means?

Regards,
  Dennis