[ClusterLabs] Request for ideas: Cluster node summary in 14 characters

[Klaus Wenninger]

On Thu, Mar 17, 2022 at 4:16 PM Ulrich Windl <
Ulrich.Windl at rz.uni-regensburg.de> wrote:

> Hi!
>
> I had the idea to display the status of a cluster node on the 14-character
> LCD display of a Dell PowerEdge server; preferably displaying the hostname
> at least partially, too ;-)
>
> Now, what would you display, and how would you display it?
>
> (Actually I already have something (e.g. "h18:T[3Q_]P8V"), but I'd like to
> get your ideas)
>

hmm ... that isn't even enough for a bit.ly-link ;-)


>
> BTW, I also wanted to write a pseudo fencing agent that displays
> "Fencing..." on the LCD when the node is being fenced (hopefully it will
> stay there during reboot), but I realized that the documentation is rather
> incomplete. Most of all I don't really have a fencing-test environment...
>

Something like
https://github.com/ClusterLabs/fence-agents/blob/main/agents/heuristics_ping/fence_heuristics_ping.py
to be used with a fencing-topology?
With a simple client on the node to be fenced and always returning success
...
Unfortunately it probably won't work in most of the interesting cases as
either the to
be fenced node isn't gonna be alive enough or connectivity is gone.
Or is it possible to make the remote-management (aka fencing-device) talk
to the
display somehow to display a configurable text.
Going with an alert agent or registering for fence-history (history would
be reported
on all nodes - thus no need for additional communication) probably isn't
gonna be
helpful either as I think you can't see partial success on a topology -
just when it
is reported to be finally killed - well to late then to do something on the
node to be killed :-(

Klaus

>
> Regards,
> Ulrich
>
>
>
> _______________________________________________
> Manage your subscription:
> https://lists.clusterlabs.org/mailman/listinfo/users
>
> ClusterLabs home: https://www.clusterlabs.org/
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.clusterlabs.org/pipermail/users/attachments/20220317/9849a0f0/attachment.htm>