[ClusterLabs] Antw: Re: Antw: [EXT] Preventing a resource from migrating to / starting on a node

[Ulrich Windl]

>>> Ken Gaillot <kgaillot at redhat.com> schrieb am 29.11.2022 um 20:41 in
Nachricht
<23873b16397171f0880ee691a0aef5a6e3ef39a4.camel at redhat.com>:
> The use case here is for external code (DRBD) to ban a resource from a
> node. While DRBD could add/remove location constraints, it's better to
> have permanent (rule‑based) location constraints in the configuration,
> and let DRBD just set or unset a node attribute to trigger the
> constraint.
> 
> As a general rule, it's best to avoid automated configuration changes
> (via resource agents, crons, DRBD, etc.) other than node attributes.
> There's just more room for something to go wrong.

I think setting the wrong node attributes (combined with the "right" rules)
can be just as desastous as adding bad location constraints.

...

Regards,
Ulrich