[Pacemaker] Full API description for Fence Agent

[Lars Marowsky-Bree]

On 2013-06-15T08:26:33, Andrew Beekhof <andrew at beekhof.net> wrote:

> > (I'm not sure I get the second point. Even the "old" cluster-glue
> > scripts were executable from the commandline?)
> The RH ones are executable directly, not relying on separate command line utils.

Well, you can call the cluster-glue ones directly too; at least the
"external" scripts, which by now seem to be all of those that really
matter ;-)

> > Over the years, that has eroded more and more; nowadays, a lot of that
> > stuff no longer makes any sense.
> Yep. I know why things work that way, but reality got in the way :)

Yes, that tends to suck. My life would be much better if better
insulated against reality!

(And a previous obsession with run-time-loadable C plugins with silly
interfaces. Turns out C really sucks for interfacing with text-based
interfaces, surprise. And then they needed memory *anyway* for their
network calls and external programs ...)

> > Yes, I think the RH APIs might be better. I'm planning on adding a
> > fence_sbd wrapper for example, and wondering how much code pacemaker
> > could save if the cluster-glue ones were dropped?
> Code in Pacemaker?  Not much, just fence_legacy I think.

Sad, I was hoping it'd help simplify interfaces somewhere.

But there's still the gain of not maintaining certain modules twice,
getting access to those that are in the other, and a reduced admin/user
story. So I hope it's going to be worth it anyway.

> > (I'm assuming that fence-agents has most devices too; or that the agents
> > could be changed to conform with that interface.)
> I think most devices are covered.  Here is the install list (there may be more that we don't ship):

Yeah, another thing I like about fence-agents as shown there is how they
are broken out into sub-packages, so one doesn't pull in all those
dependencies in one go.


Regards,
    Lars

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Architect Storage/HA
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"Experience is the name everyone gives to their mistakes." -- Oscar Wilde