Is it possible that "virsh destroy" does not stop a domain ?

[Lentes, Bernd]

Hi,

Is it possible that "virsh destroy" does not stop a domain ?
I'm asking because i have some domains running in a two-node HA-Cluster (pacemaker).
And sometimes one node get fenced (killed) because it couldn't stop a domain.
That's very ugly.

This is also the reason why i asked before what "virsh destroy" really does ?
IIRC a kill -9 can't terminate a process which is in "D" state (uninterruptible sleep).
So if the process of the domain is in "D" state, it can't be finished. Right ?

Pacemaker tries to shutdown or destroy a domain with a resource agent, which is a shell script, similar 
to an init script.

Here is an excerp from the resource agent for virtual domains:

force_stop()
{
        local out ex translate
        local status=0

        ocf_log info "Issuing forced shutdown (destroy) request for domain ${DOMAIN_NAME}."
        out=$(LANG=C virsh $VIRSH_OPTIONS destroy ${DOMAIN_NAME} 2>&1)              # hier wird die domain destroyed
        ex=$?
        translate=$(echo $out|tr 'A-Z' 'a-z')
        echo >&2 "$translate"
        case $ex$translate in
                *"error:"*"domain is not running"*|*"error:"*"domain not found"*|\
                *"error:"*"failed to get domain"*)
                        : ;; # unexpected path to the intended outcome, all is well   sucess
                [!0]*)
                        ocf_exit_reason "forced stop failed"   # <============ fail of destroy seems to be possible
                        return $OCF_ERR_GENERIC ;;     
                0*)
                        while [ $status != $OCF_NOT_RUNNING ]; do
                                VirtualDomain_status
                                status=$?
                        done ;;
        esac
        return $OCF_SUCCESS
}

The function force_stop is responsible for stop/destroy the domain.
And it cares about a non-working "virsh destroy".
Is there a developer who can explain what "virsh destroy" really does ?
Or is there another ML for the developers ?

Bernd

-- 

Bernd Lentes 
Systemadministration 
Institute for Metabolism and Cell Death (MCD) 
Building 25 - office 122 
HelmholtzZentrum München 
bernd.lentes at helmholtz-muenchen.de 
phone: +49 89 3187 1241 
phone: +49 89 3187 3827 
fax: +49 89 3187 2294 
http://www.helmholtz-muenchen.de/mcd 

stay healthy
Helmholtz Zentrum München

Helmholtz Zentrum München