[Pacemaker] Clone Set does not start its lsb service on all nodes

[Andrew Martin]

Hi Andreas, 


You are correct, the /etc/init.d/libvirt-bin pseudo-LSB script did not adhere to the LSB specification (e.g. returning exit code 3 when the "status" parameter is passed and the service is stopped) since it is just a legacy alias for the upstart job. I have upgraded to the version of pacemaker in the Ubuntu-HA ppa, which includes the upstart resource agent that I am using now. However, for anyone who does not have access to a version of pacemaker with the upstart resource agent, I developed this modification that could be added to the /etc/init.d script to make it LSB compliant: 

@@ -42,7 +42,13 @@ 
$ECHO 
$ECHO "Since the script you are attempting to invoke has been converted to an" 
$ECHO "Upstart job, you may also use the $COMMAND(8) utility, e.g. $COMMAND $JOB" 
- $COMMAND "$JOB" 
+ ### modification start - makes the output LSB compliant (if stopped exit code is 3) ### 
+ TEMPSTATUS=`mktemp` 
+ $COMMAND "$JOB" | tee $TEMPSTATUS 
+ if [ "`grep -q stop $TEMPSTATUS ; echo $?`" = "0" ]; then 
+ exit 3 
+ fi 
+ ### modification stop ### 
;; 
start|stop|restart) 
$ECHO 

Thanks, 


Andrew 

----- Original Message -----

From: "Andreas Ntaflos" <daff at pseudoterminal.org> 
To: "The Pacemaker cluster resource manager" <pacemaker at oss.clusterlabs.org>, amartin at xes-inc.com 
Sent: Wednesday, February 15, 2012 4:09:53 PM 
Subject: Re: [Pacemaker] Clone Set does not start its lsb service on all nodes 

On 2012-02-13 23:29, Andrew Martin wrote: 
> However, often the libvirt-bin daemon is not actually running (and thus 
> the VMs fail to migrate): 
> # service libvirt-bin status 
> libvirt-bin stop/waiting 

It seems the libvirt init script (which is actually an upstart job) 
either starts the daemon successfully and at some later point the daemon 
itself fails, or the init script doesn't actually start the libvirt 
daemon, even though it reports that it did. 

What happens when you start libvirt manually by means of the init script 
(after disabling the cluster or putting it into maintenance mode)? What 
does /var/log/libvirt/libvirtd.log say? 

Please also do the tests described in [1] to determine whether the 
libvirt init script/upstart job behaves according to LSB specifications. 

Also, to avoid any interferenc, you have to take care that only 
pacemaker and not upstart has full control over starting and stopping 
the libvirt daemon, i.e. making sure libvirt isn't started on system 
startup. Usually this is done by means of update-rc.d, but this doesn't 
work with upstart jobs. For Ubuntu 10.04 it means commenting the "start 
on ..." and possibly "stop on ..." lines at the beginning of 
/etc/init/libvirt-bin.conf. 

> This does not seem like the correct behavior for the clone - my 
> understanding is that a clone requires the resource to be running at all 
> nodes at all times. What can I try to ensure that libvirt-bin remains 
> running on all nodes? 

I don't think pacemaker is the problem here. It seems more like your 
libvirt daemons are misbehaving. 

Andreas 

[1] 
http://www.clusterlabs.org/doc/en-US/Pacemaker/1.0/html/Pacemaker_Explained/ap-lsb.html 


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