[Linux-HA] Master / Slave resource

[Andrew Beekhof]

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 :-(  )

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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