[ClusterLabs] Antw: Re: Does anyone use clone instance constraints from pacemaker-next schema?

[Ulrich Windl]

BTW: Could be fix that "Master/slave resources need different monitoring intervals for master and slave" at this time?


>>> Jehan-Guillaume de Rorthais <jgdr at dalibo.com> schrieb am 11.01.2018 um 01:16 in
Nachricht <20180111011616.496a383b at firost>:
> On Wed, 10 Jan 2018 12:23:59 -0600
> Ken Gaillot <kgaillot at redhat.com> wrote:
> ...
>> My question is: has anyone used or tested this, or is anyone interested
>> in this? We won't promote it to the default schema unless it is tested.
>> 
>> My feeling is that it is more likely to be confusing than helpful, and
>> there are probably ways to achieve any reasonable use case with
>> existing syntax.
> 
> For what it worth, I tried to implement such solution to dispatch mulitple
> IP addresses to slaves in a 1 master 2 slaves cluster. This is quite time
> consuming to wrap its head around sides effects with colocation, scores and
> stickiness. My various tests shows everything sounds to behave correctly 
> now,
> but I don't feel really 100% confident about my setup.
> 
> I agree that there are ways to achieve such a use case with existing syntax.
> But this is quite confusing as well. As instance, I experienced a master
> relocation when messing with a slave to make sure its IP would move to the
> other slave node...I don't remember exactly what was my error, but I could
> easily dig for it if needed.
> 
> I feel like it fits in the same area that the usability of Pacemaker. Making 
> it
> easier to understand. See the recent discussion around the gocardless war 
> story.
> 
> My tests was mostly for labs, demo and tutorial purpose. I don't have a
> specific field use case. But if at some point this feature is promoted
> officially as preview, I'll give it some testing and report here (barring 
> the
> fact I'm actually aware some feedback are requested ;)).
> 
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