[ClusterLabs] Antw: Re: reboot node / cluster standby

Ulrich Windl Ulrich.Windl at rz.uni-regensburg.de
Thu Jul 6 07:21:56 UTC 2017


>>> Ken Gaillot <kgaillot at redhat.com> schrieb am 29.06.2017 um 21:15 in Nachricht
<44ee8b24-fe14-a204-f791-248546c2ff8c at redhat.com>:
> On 06/29/2017 01:38 PM, Ludovic Vaugeois-Pepin wrote:
>> On Thu, Jun 29, 2017 at 7:27 PM, Ken Gaillot <kgaillot at redhat.com> wrote:
>>> On 06/29/2017 04:42 AM, philipp.achmueller at arz.at wrote:
>>>> Hi,
>>>>
>>>> In order to reboot a Clusternode i would like to set the node to standby
>>>> first, so a clean takeover for running resources can take in place.
>>>> Is there a default way i can set in pacemaker, or do i have to setup my
>>>> own systemd implementation?
>>>>
>>>> thank you!
>>>> regards
>>>> ------------------------
>>>> env:
>>>> Pacemaker 1.1.15
>>>> SLES 12.2
>>>
>>> If a node cleanly shuts down or reboots, pacemaker will move all
>>> resources off it before it exits, so that should happen as you're
>>> describing, without needing an explicit standby.
>> 
>> This makes me wonder about timeouts. Specifically OS/systemd timeouts.
>> Say the node being shut down or rebooted holds a resource as a master,
>> and it takes a while for the demote to complete, say 100 seconds (less
>> than the demote timeout of 120s in this hypothetical scenario).  Will
>> the OS/systemd wait until pacemaker exits cleanly on a regular CentOS
>> or Debian?
> 
> Yes. The pacemaker systemd unit file uses TimeoutStopSec=30min.

>From crm ra info ocf:heartbeatSAPDatabase:
Operations' defaults (advisory minimum):

    start         timeout=1800
    stop          timeout=1800
    status        timeout=60
    monitor       timeout=60 interval=120
    methods       timeout=5


;-)

So your score may vary. The RA probably won't take that long, but we have VMs that need > 6 minutes to shut down. If you shut down 10 such VMs sequentially, you need to be patient (at least)...

> 
>> 
>> 
>>> Explicitly doing standby first would be useful mainly if you want to
>>> manually check the results of the takeover before proceeding with the
>>> reboot, and/or if you want the node to come back in standby mode next
>>> time it joins.
> 
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