[ClusterLabs] Pacemaker Fail Master-Master State

[damiano giuliani]

My question is:
Why you are pausing one VM?there is any specific scope in that?you should
never have 2 master resources, pausing one vm could make unexpected
behaviours.
If you are testing failovers or simulated faults you must configure a
fencing mechanism.
Dont expect your cluster is working properly without it.

On Sun, 21 Feb 2021, 07:29 İsmet BALAT, <bcalbatros at gmail.com> wrote:

> Sorry, I am in +3utc and was sleeping. I will try first fix node, then
> start cluster. Thank you
>
> On 21 Feb 2021 Sun at 00:00 damiano giuliani <damianogiuliani87 at gmail.com>
> wrote:
>
>> resources configured in a master/slave mode
>> If you got 2 masters something is not working right. You should never
>> have 2 node in master.
>> Disable pacemaker and corosync services to autostart on both nodes
>> systemctl disable corosync
>> Systemctl disable pacemaker
>>
>> You can start the faulty node using pcs cli:
>> pcs cluster start
>>
>> You can start the whole cluster using
>> pcs cluster start --all
>>
>> First of all configure a fencing mechanism to make the cluster
>> consistent. Its mandatory.
>>
>>
>>
>> On Sat, 20 Feb 2021, 21:47 İsmet BALAT, <bcalbatros at gmail.com> wrote:
>>
>>> I am not using fence. If I disable pacemaker,how node join cluster (for
>>> first example in video - master/slave changing)? So I need a check script
>>> for fault states :(
>>>
>>> And thank you for reply
>>>
>>> On 20 Feb 2021 Sat at 23:40 damiano giuliani <
>>> damianogiuliani87 at gmail.com> wrote:
>>>
>>>> Hi,
>>>>
>>>> Have you correcly configure a working fencing mechanism?without it you
>>>> cant rely on a safe and consistent environment.
>>>> My suggestion is to disable the autostart services (and so the autojoin
>>>> into the cluster) on both nodes.
>>>>  if there is a fault you have to investigate before you rejoin the old
>>>> fault master node.
>>>> Pacemaker (and paf if u are using it) as far i know,  doesnt support
>>>> the autoheal of the old master, so you should resync or pg_rewind eveythime
>>>> there is a fault.
>>>>
>>>>
>>>>
>>>> On Sat, 20 Feb 2021, 19:03 İsmet BALAT, <bcalbatros at gmail.com> wrote:
>>>>
>>>>> I am using Pacemaker with Centos 8 and Postgresql 12. Failover
>>>>> master/slave states successfully run. But if all nodes are masters,
>>>>> pacemaker can't repair its unlikely send command 'pcs resources cleanup'.
>>>>> Wheras I set 60s in resource config. How can I fix it?
>>>>>
>>>>> StackOverFlow link:
>>>>> https://stackoverflow.com/questions/66292304/pacemaker-postgresql-master-master-state
>>>>>
>>>>> Thanks
>>>>>
>>>>> İsmet BALAT
>>>>>
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