[ClusterLabs] Antw: Re: Set a node attribute for multiple nodes with one command

[Kostiantyn Ponomarenko]

Ken,
Thank you for the explanation.
I will try this low-level way of shadow cib creation tomorrow.
PS: I will sleep much better with this excellent news/idea. =)

Thank you,
Kostia

On Tue, Nov 22, 2016 at 10:53 PM, Ken Gaillot <kgaillot at redhat.com> wrote:

> On 11/22/2016 04:39 AM, Kostiantyn Ponomarenko wrote:
> > Using "shadow cib" in crmsh looks like a good idea, but it doesn't work
> > with node attributes set into "status" section of Pacemaker config.
> > I wonder it it is possible to make it work that way.
>
> Forgot to mention -- the shadow CIB is probably the best way to do this.
> I don't know if there's a way to do it in crmsh, but you can use it with
> the low-level commands crm_shadow and crm_attribute --lifetime=reboot.
>
> > Ken,
> >>> start dampening timer
> > Could you please elaborate more on this. I don't get how I can set this
> > timer.
> > Do I need to set this timer for each node?
> >
> >
> > Thank you,
> > Kostia
> >
> > On Mon, Nov 21, 2016 at 9:30 AM, Ulrich Windl
> > <Ulrich.Windl at rz.uni-regensburg.de
> > <mailto:Ulrich.Windl at rz.uni-regensburg.de>> wrote:
> >
> >     >>> Ken Gaillot <kgaillot at redhat.com <mailto:kgaillot at redhat.com>>
> >     schrieb am 18.11.2016 um 16:17 in Nachricht
> >     <d6f449da-64f8-12ad-00be-e772d8e382ca at redhat.com
> >     <mailto:d6f449da-64f8-12ad-00be-e772d8e382ca at redhat.com>>:
> >     > On 11/18/2016 08:55 AM, Kostiantyn Ponomarenko wrote:
> >     >> Hi folks,
> >     >>
> >     >> Is there a way to set a node attribute to the "status" section
> for few
> >     >> nodes at the same time?
> >     >>
> >     >> In my case there is a node attribute which allows some resources
> to
> >     >> start in the cluster if it is set.
> >     >> If I set this node attribute for say two nodes in a way - one and
> then
> >     >> another, than these resources are not distributed equally between
> these
> >     >> two nodes. That because Pacemaker picks the first node to with
> this
> >     >> attribute is set and immediately starts all allowed resources on
> it. And
> >     >> this is not the behavior i would like to get.
> >     >>
> >     >> Thank you,
> >     >> Kostia
> >     >
> >     > Not that I know of, but it would be a good feature to add to
> >     > attrd_updater and/or crm_attribute.
> >
> >     With crm (shell) you don't have transactions for node attributes,
> >     but for the configuration. So if you add a location restriction
> >     preventing any resources on your nodes, then enable the nodes, and
> >     then delete the location restrictions in one transaction, you might
> >     get what you want. It's not elegant, but itt ill do.
> >
> >     To the crm shell maintainer: Is is difficult to build transactions
> >     to node status changes? The problem I see is this: For configuration
> >     you always have transactions (requiring "commit), but for nodes you
> >     traditionally have non (effects are immediate). So you'd need a
> >     thing like "start transaction" which requires a "commit" or some
> >     kind of abort later.
> >
> >     I also don't know whether a "shadow CIB" would help for the original
> >     problem.
> >
> >     Ulrich
> >
> >     >
> >     > You can probably hack it with a dampening value of a few seconds.
> If
> >     > your rule checks for a particular value of the attribute, set all
> the
> >     > nodes to a different value first, which will write that value and
> >     start
> >     > the dampening timer. Then set all the attributes to the desired
> value,
> >     > and they will get written out together when the timer expires.
>
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