[ClusterLabs] Antw: [EXT] Re: resource management of standby node

[Ulrich Windl]

>>> Roger Zhou <zzhou at suse.com> schrieb am 09.12.2020 um 03:57 in Nachricht
<4859f848-3a4a-8996-a6c0-a43640d68931 at suse.com>:

> On 12/1/20 4:03 PM, Ulrich Windl wrote:
>>>>> Ken Gaillot <kgaillot at redhat.com> schrieb am 30.11.2020 um 19:52 in Nachricht
>> <f3c9daaca84fea2c0db99c5ae161e4785e75a802.camel at redhat.com>:
>> 
>> ...
>>>
>>> Though there's nothing wrong with putting all nodes in standby. Another
>>> alternative would be to set the stop-all-resources cluster property.
>> 
>> Hi Ken,
>> 
>> thanks for the valuable feedback!
>> 
>> I was looking for that, but unfortunately crm shell cannot set that from the 
> resource (or node) context; only from the configure context.
>> I don't know what a good syntax would be "resource stop all" / "resource 
> start all" or "resource stop-all" / "resource unstop-all"
>> (the asymmetry is that after a "stop all" you cannot start a singly resource 
> (I guess), but you'll have to use "start-all" (which, in turn, does not start 
> resources that have a stopped role (I guess).
>> 
>> So maybe "resource set stop-all" / "resource unset stop-all" / "resource 
> clear stop-all"
>> 
> 
> 1.
> Well, let `crm resource stop|start all` change the cluster property of 
> `stop-all-resources` might contaminate the syntax at the resources level 
> alone. 
> To avoid that, the user interface need be more carefully to deliver the 
> proper 
> information at the first place about the internals at some degree to avoid 
> the 
> potential misunderstanding or questions.
> 
> 2.
> On the other hand, people might naturally read `crm resource stop all` as 
> changing all resources `target-role=Stopped`. Well, technically this seems a 
> 
> bit awkward, but no obvious benefit comparing to stop-all-resources. And, 
> pacemaker developers could comment more internals around this.
> 
> 3.
> `resource set|unset` add more commands under `resource` and will confuse 
> some 
> users and should be avoided in my view.
> 
> I feel more discussion is expected, though my gut feeling approach 1 is a 
> better one.

Well, crm shell cannot fix the mess that accumulated in XML CIB ;-)

Rethinking about the confusion of "resource stop all" a somewhat inconsistent syntax "resource stop-all" could be thinkable too.
("start" the same way)

> 
> Anyway, good topic indeed. Feedback from more users would be useful to shape 
> 
> the better UI/UX. I can imagine some people may have idea to suggest "--all" 
> 
> even, btw.
> 
> Thanks,
> Roger