[Linux-HA] Re: start-delay for monitor operation not implemented?

[Andrew Beekhof]

On 10/19/06, Stephen Souness <sounie at hotmail.com> wrote:
> Dejan Muhamedagic wrote:
> > On Thu, Oct 19, 2006 at 01:16:46PM +0200, Andrew Beekhof wrote:
> >> On 10/19/06, Stephen Souness <sounie at hotmail.com> wrote:
> >>> [ Snip ]
> >>>
> >>> Is there a short answer to the question of whether or not heartbeat v2's
> >>> monitor operation utilizes start-delay?
> >>>
> >>> I have an OCF script which starts Tomcat, but Tomcat has not finished
> >>> its start-up sequence by the time heartbeat calls the OCF script with
> >>> "monitor".
> >> then your RA is broken.  it should not report "success" until it is
> >> actually succeeded.
> >>
> >> regardless of anything else, this is your biggest problem.
>
> I was being a bit lazy and letting the first monitor call would do the
> checking for me, but you're right.
>
> I'll modify my script so that it will check that the application is
> actually successfully started before returning.

hint: the easiest way is for your "start" operation to call your
"monitor" operation until it returns what you expect (namely that the
resource is properly active)

>
> >
> > Right. However, for some resources, it's really hard to say when
> > they are actually finished the initialization. Tomcat probably
> > belongs to the group. Not an expert on java, but probably the only
> > way to establish that it is really running is to try to use it
> > through a web interface. Some time ago, I posted a scheme on how
> > to do this, but so far there were no takers to test it.
> >
>
> I'll probably end up with a loop checking the result of a call to wget
> on a known URL for checking a successful start.  If I'm feeling pedantic
> then I may add a check to ensure that the Tomcat process is actually
> running as well.
>
>
> Can you re-post the scheme, or refer me to an archive of your post?
>
>
> --
> Stephen
>
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