[ClusterLabs] Best way to create a floating identity file

[Andrei Borzenkov]

On Tue, Dec 15, 2020 at 4:58 PM Tony Stocker <akostocker at gmail.com> wrote:
>
> I'm trying to figure out the best way to do the following on our
> 2-node clusters.
>
> Whichever node is the primary (all services run on a single node) I
> want to create a file that contains an identity descriptor, e.g.
> /var/local/project/identity and the contents are "httpserver". This is
> so that we can utilize this file in cron scripts (and other programs)
> to determine on which system log files should get rotated, services
> should get HUP'd, etc. When the resource group moves between nodes,
> this file gets deleted on the (now) inactive node and written to on
> the active node.
>

You could simply query whether a specific resource (group) is active
on the node where your script runs. I used a similar approach in two
node cluster (in this case I simply needed to make sure only one node
runs cron job so I checked for CB master).

> Is there already a resource agent that does this? If so, could someone
> point me at it?
>
> If not, what's the best way to accomplish this? Is it necessary to
> write a complete resource agent script just to do this? Or is there a
> simpler way?
>
> Thanks for your help
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