[ClusterLabs] DRBD 2-node M/S doesn't want to promote new master, Centos 8

[Brent Jensen]

FYI: I was using ELREPO's packages:
kmod-drbd90.x86_64               9.0.25-2.el8_3.elrepo
drbd90-utils.x86_64              9.13.1-1.el8.elrepo
drbd90-utils-sysvinit.x86_64     9.13.1-1.el8.elrepo

I just tried EPEL's packages (still needed elrepos's kmod) and nothing 
seemed to work there (the cluster couldn't seem to load DRBD) even 
though it worked manually.

drbd.x86_64 9.13.1-1.el8
drbd-pacemaker.x86_64            9.13.1-1.el8
drbd-udev.x86_64                 9.13.1-1.el8
drbd-utils.x86_64                9.13.1-1.el8
kmod-drbd90.x86_64               9.0.25-2.el8_3.elrepo

e.g. output:
pacemaker-execd[1702]: notice: drbd0_stop_0[2992] error output [ 
/usr/lib/ocf/resource.d/linbit/drbd: line 318: USAGE:: command not found ]
pacemaker-execd[1702]: notice: drbd0_stop_0[2992] error output [ 
/usr/lib/ocf/resource.d/linbit/drbd: line 320: Commands:: command not 
found ]
pacemaker-execd[1702]: notice: drbd0_stop_0[2992] error output [ 
/usr/lib/ocf/resource.d/linbit/drbd: line 321: primary: command not found ]
pacemaker-execd[1702]: notice: drbd0_stop_0[2992] error output [ 
/usr/lib/ocf/resource.d/linbit/drbd: line 322: secondary: command not 
found ]
pacemaker-execd[1702]: notice: drbd0_stop_0[2992] error output [ 
/usr/lib/ocf/resource.d/linbit/drbd: line 323: attach: command not found ]
pacemaker-execd[1702]: notice: drbd0_stop_0[2992] error output [ 
/usr/lib/ocf/resource.d/linbit/drbd: line 324: disk-options: command not 
found ]
pacemaker-execd[1702]: notice: drbd0_stop_0[2992] error output [ 
/usr/lib/ocf/resource.d/linbit/drbd: line 325: detach: command not found ]
pacemaker-execd[1702]: notice: drbd0_stop_0[2992] error output [ 
/usr/lib/ocf/resource.d/linbit/drbd: eval: line 326: syntax error near 
unexpected token `(' ]

Brent

On 1/16/2021 11:07 AM, Strahil Nikolov wrote:
> В 14:10 -0700 на 15.01.2021 (пт), Brent Jensen написа:
>>
>> Problem: When performing "pcs node standby" on the current master, 
>> this node demotes fine but the slave doesn't promote to master. It 
>> keeps  looping the same error including "Refusing to be Primary while 
>> peer is  not outdated" and "Could not connect to the CIB." At this 
>> point the old  master has already unloaded drbd. The only way to fix 
>> it is to start  drbd on the standby node (e.g. drbdadm r0 up). Logs 
>> contained herein are  from the node trying to be master.
>>
> In order to debug, stop the cluster and verify that drbd is running 
> properly. Promote one of the nodes, then demote and promote another one...
>> I have done this on DRBD9/Centos7/Pacemaker1 w/o any problems. So I 
>> don't know were the issue is (crm-fence-peer.9.sh 
>> <http://crm-fence-peer.9.sh>
>>
>> Another odd data point: On the slave if I do a "pcs node standby" & 
>> then unstandby, DRBD is loaded again; HOWEVER, when I do this on the 
>> master (which should then be slave), DRBD doesn't get loaded.
>>
>> Stonith/Fencing doesn't seem to make a difference. Not sure if 
>> auto-promote is required.
>>
> Quote from official documentation 
> (https://www.linbit.com/drbd-user-guide/drbd-guide-9_0-en/#s-pacemaker-crm-drbd-backed-service 
> <https://www.linbit.com/drbd-user-guide/drbd-guide-9_0-en/#s-pacemaker-crm-drbd-backed-service>):
> If you are employing the DRBD OCF resource agent, it is recommended 
> that you defer DRBD startup, shutdown, promotion, and demotion 
> /exclusively/ to the OCF resource agent. That means that you should 
> disable the DRBD init script:
> So remove the autopromote and disable the drbd service at all.
>
> Best Regards, Strahil Nikolov
>
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