[Linux-HA] Master / Slave resource

[Andrew Beekhof]

On 10/18/06, Keisuke MORI <kskmori at intellilink.co.jp> wrote:
> Hi Andrew,
>
> "Andrew Beekhof" <beekhof at gmail.com> writes:
>
> > This may help you http://linux-ha.org/v2/Concepts/MultiState
> > particularly section 6
> >
> > (  yes i know the docs are generally hopeless and hard to navigate :-(  )
>
> Sorry but I've already read the docs and have been trying to make it work,
> and still have the questions in my previous mail.
>
> My understanding from the doc regarding to my question 1,
> using "notify" is mandatory

where does it say that?
the example has notifications turned off so i don't know why you'd think this.

> and "post start" should be notified
> to the RA, but as long as I tried the notification didn't come.

Did you configure the CRM to send them?

> I have no idea whether it is because of my config's fault or the
> RA's fault or a Heartbeat's bug or the design issue.

Neither do I since your config was not included ;-)

>
> Regarding to my Q.4 and 5, I could not find related descriptions
> on the docs. Please point me out if I'm missing.

Q4: you cant.  master/slave resources can contain groups but not the
other way around

Q5 : http://linux-ha.org/v2/Concepts/MultiState#head-e5d5a9318a3fdb0dffab64280c0fa0840a721b19

you'd need update the CIB and change the preference for one of the
other instances

>
> Thanks,
>
> >
> > On 10/17/06, Keisuke MORI <kskmori at intellilink.co.jp> wrote:
> >> Hi,
> >>
> >> I'm trying to use master/slave feature with heartbeat 2.0.7.
> >>
> >> I know that the master/slave is not yet ready to use "out of the box"
> >> according to some articles from the ML archive, but I would like
> >> to know how is it designed to work, what the current status of
> >> the implementation and what the rest things to do.
> >>
> >> For my testing, I configured OCF drbd RA which comes with 2.0.7
> >> on two nodes. When I start heartbeat, slave resources start on
> >> each node but none of them get promoted.
> >>
> >> My questions are:
> >>
> >> 1. The drbd OCF RA apparently expects to get "post start"
> >>    notification to issue crm_master command, but I never see the
> >>    "pre/post start" notification in the log (see the attached
> >>    log for details).
> >>
> >> 2. If the RA is wrong, how should it be fixed?
> >>
> >> 3. In my real application, I expect to work as the following sequence.
> >>    Is it possible?
> >>    i)  the heatbeat starts the resources on all nodes as "slave" state.
> >>    ii) after all resources have launched, the heartbeat choose
> >>        which one should be the master (determined by a config. anyhow)
> >>        and issue promote to it.
> >>
> >> 4. How can I make a group of m/s resources?
> >>    What I want is to let some resources (typically Filesystem or IP)
> >>    failover along with the master resource.
> >>    The DTD says that <master_slave> can contain <group> but I'm
> >>    not sure if it's meant for it.
> >>
> >> 5. How can I manually move the master?
> >>    (i.e. crm_resource -M for master resource)
> >>
> >>
> >> Any help or advice is appreciated.
> >> Thank you.
> >> --
> >> Keisuke MORI
> >> NTT DATA Intellilink Corporation
> >>
> >> _______________________________________________
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> >> Linux-HA at lists.linux-ha.org
> >> http://lists.linux-ha.org/mailman/listinfo/linux-ha
> >> See also: http://linux-ha.org/ReportingProblems
> >>
> > _______________________________________________
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>
> --
> Keisuke MORI
> NTT DATA Intellilink Corporation
>
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>