[Pacemaker] Cannot start VirtualDomain resource after restart

[emmanuel segura]

Thanks Phil

I readed the resource agent VirtualDomain and it's like that
====================================================
VirtualDomain_Start() {
    if VirtualDomain_Status; then
        ocf_log info "Virtual domain $DOMAIN_NAME already running."
        return $OCF_SUCCESS
    fi

    virsh $VIRSH_OPTIONS start ${DOMAIN_NAME}
    rc=$?
    if [ $rc -ne 0 ]; then
        ocf_log error "Failed to start virtual domain ${DOMAIN_NAME}."
        return $OCF_ERR_GENERIC
    fi

    while ! VirtualDomain_Monitor; do
        sleep 1
    done
    return $OCF_SUCCESS
}
============================================================

;-) Thank you very much

2012/6/20 Phil Frost <phil at macprofessionals.com>

> On 06/20/2012 10:11 AM, emmanuel segura wrote:
>
>> I don't know but see the fail it's in the operation lx0_monitor_0, so i
>> ask to someone with more experience then me, if pacemaker does a monitor
>> operation before start?
>>
>
> I'm just learning Pacemaker myself, so I could be wrong on some points. I
> don't have any specific solutions to give, but I can share some
> troubleshooting techniques that might give some deeper insight into what is
> happening.
>
> Firstly, I'd try running "crm_simulate -LS -D pacemaker.dot", then viewing
> the generated pacemaker.dot with graphviz [1] (specifically "dot". It might
> also be helpful to pass pacemaker.dot through "tred" first, to make it more
> readable). This asks crm_simulate to simulate what pacemaker would like to
> do (-S), given the current live state (-L). Probably it will tell you it
> would do nothing, because it's already running in the desired (by
> pacemaker, anyway) state. However, I have seen instances in testing where
> Pacemaker will be stuck in some start -> monitor -> timeout loop that's not
> immediately obvious in crm_mon. This will reveal that.
>
> You can also use crm_simulate to see what Pacemaker would do if you
> rebooted everything. This can give you some insight because it removes the
> current state of all your nodes from the equation. To do this, you have to
> generate a CIB dump without a status section. You can do that by manually
> editing the output of "cibadmin -Q", but an easier way is to run "crm
> configure show xml". Since there's no status section, crm_simulate will
> assume the nodes are offline, so you also have to use the "-u" option to
> tell it to simulate the nodes coming online. Putting that all together, you
> get something like this:
>
> crm configure show xml | crm_simulate -Sp -D pacemaker.dot -u node01 -u
> node02 [-u node03 ...]
>
> Of course you will have to adjust the node names to suit your environment.
> You should see Pacemaker wanting to start all your resources. If not,
> there's probably something in your configuration that prevents it from
> doing so. Coincidentally, you will also see here the answer to your
> question: Pacemaker does do a monitor of a resource on all nodes before
> starting it. This way, it can avoid starting it if it was already running
> but it didn't know about it.
>
> If all that proves unfruitful, you can continue to run other "what-if"
> tests by dumping the current CIB with "cibadmin -Q", editing it, and
> passing it into crm_simulate. In this way you can make some guesses about
> what's wrong and test your hypothesis.
>
> [1] http://www.graphviz.org/
>
>
>
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