[Pacemaker] Problem in Stonith configuration
Andreas Kurz
andreas at hastexo.com
Tue Oct 18 11:26:41 EDT 2011
On 10/18/2011 11:21 AM, neha chatrath wrote:
> Hello,
>> 1. If a resource fails, node should reboot (through fencing mechanism)
>> and resources should re-start on the node.
>
> Why would you want that? This would increase the service downtime
> considerable. Why is a local restart not possible ... and even if there
> is a good reason for a reboot, why not starting the resource on the
> other node?
> -In our system, there are some primitive, clone resources along with 3
> different master-slave resources.
> -All the masters and slaves of these resources are co-located i.e. all
> the 3 masters are co-located on a node and 3 slaves on the other node.
> -These 3 master-slaves resources are tightly coupled. There is a
> requirement that failure of even any one of these resources, restarts
> all the resources in the group
> -All these resources can be shifted to the other node but subsequently
> these should also be restarted as a lot of data/control plane synching
> is being done between the two nodes.
> e.g. If one of the resources running on node1 as a Master fails, then
> all these 3 resources are shifted to the other node i.e. node2 (with
> corresponding slave resources being promoted as master). On node1,
> these resources should get re-started as slaves.
>
> We understand that node restart will increase the downtime but since we
> could not find much on the option for group restart of master-slave
> resources, we are trying for node restart option.
Hmm ... then the definition of on-fail=fence on monitoring failure
should give you what you want.
Consequently you should define this for all MS resources because once a
node is in standby (on-fail=standby) it has to be manually put online
again ... or keep the default for the "less important" MS resources.
Regards,
Andreas
--
Need help with Pacemaker?
http://www.hastexo.com/now
>
> Thanks and regards
> Neha Chatrath
>
> ---------- Forwarded message ----------
> From: *Andreas Kurz* <andreas at hastexo.com <mailto:andreas at hastexo.com>>
> Date: Tue, Oct 18, 2011 at 1:55 PM
> Subject: Re: [Pacemaker] Problem in Stonith configuration
> To: pacemaker at oss.clusterlabs.org <mailto:pacemaker at oss.clusterlabs.org>
>
>
> Hello,
>
> On 10/18/2011 09:00 AM, neha chatrath wrote:
>> Hello,
>>
>> Minor updates in the first requirement.
>> 1. If a resource fails, node should reboot (through fencing mechanism)
>> and resources should re-start on the node.
>
> Why would you want that? This would increase the service downtime
> considerable. Why is a local restart not possible ... and even if there
> is a good reason for a reboot, why not starting the resource on the
> other node?
>
>> 2. If the physical link between the nodes in a cluster fails then that
>> node should be isolated (kind of a power down) and the resources should
>> continue to run on the other nodes
>
> That is how stonith works, yes.
>
> crm ra list stonith ... gives you a list of all available stonith plugins.
>
> crm ra info stonit:xxxx ... details for a specific plugin.
>
> Using external/ipmi is often a good choice because a lot of servers
> already have an BMC with IPMI on board or they are shipped with a
> management card supporting IMPI.
>
> Regards,
> Andreas
>
>
> On Tue, Oct 18, 2011 at 12:30 PM, neha chatrath <nehachatrath at gmail.com
> <mailto:nehachatrath at gmail.com>> wrote:
>
> Hello,
>
> Minor updates in the first requirement.
> 1. If a resource fails, node should reboot (through fencing
> mechanism) and resources should re-start on the node.
>
> 2. If the physical link between the nodes in a cluster fails then
> that node should be isolated (kind of a power down) and the
> resources should continue to run on the other nodes
>
> Apologies for the inconvenience.
>
>
> Thanks and regards
> Neha Chatrath
>
> On Tue, Oct 18, 2011 at 12:08 PM, neha chatrath
> <nehachatrath at gmail.com <mailto:nehachatrath at gmail.com>> wrote:
>
> Hello Andreas,
>
> Thanks for the reply.
>
> So can you please suggest what Stonith plugin should I use for
> the production release of my software. I have the following
> system requirements:
> 1. If a node in the cluster fails, it should be reboot and
> resources should re-start on the node.
> 2. If the physical link between the nodes in a cluster fails
> then that node should be isolated (kind of a power down) and the
> resources should continue to run on the other nodes.
>
> I have different types of resources e.g. primitive, master-slave
> and cone running on my system.
>
> Thanks and regards
> Neha Chatrath
>
>
> Date: Mon, 17 Oct 2011 15:08:16 +0200
> From: Andreas Kurz <andreas at hastexo.com
> <mailto:andreas at hastexo.com>>
> To: pacemaker at oss.clusterlabs.org
> <mailto:pacemaker at oss.clusterlabs.org>
> Subject: Re: [Pacemaker] Problem in Stonith configuration
> Message-ID: <4E9C28C0.8070904 at hastexo.com
> <mailto:4E9C28C0.8070904 at hastexo.com>>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hello,
>
>
> On 10/17/2011 12:34 PM, neha chatrath wrote:
> > Hello,
> > I am configuring a 2 node cluster with following configuration:
> >
> > *[root at MCG1 init.d]# crm configure show
> >
> > node $id="16738ea4-adae-483f-9d79-
> b0ecce8050f4" mcg2 \
> > attributes standby="off"
> >
> > node $id="3d507250-780f-414a-b674-8c8d84e345cd" mcg1 \
> > attributes standby="off"
> >
> > primitive ClusterIP ocf:heartbeat:IPaddr \
> > params ip="192.168.1.204" cidr_netmask="255.255.255.0"
> nic="eth0:1" \
> >
> > op monitor interval="40s" timeout="20s" \
> > meta target-role="Started"
> >
> > primitive app1_fencing stonith:suicide \
> > op monitor interval="90" \
> > meta target-role="Started"
> >
> > primitive myapp1 ocf:heartbeat:Redundancy \
> > op monitor interval="60s" role="Master" timeout="30s"
> on-fail="standby" \
> > op monitor interval="40s" role="Slave" timeout="40s"
> on-fail="restart"
> >
> > primitive myapp2 ocf:mcg:Redundancy_myapp2 \
> > op monitor interval="60" role="Master" timeout="30"
> on-fail="standby" \
> > op monitor interval="40" role="Slave" timeout="40"
> on-fail="restart"
> >
> > primitive myapp3 ocf:mcg:red_app3 \
> > op monitor interval="60" role="Master" timeout="30"
> on-fail="fence" \
> > op monitor interval="40" role="Slave" timeout="40"
> on-fail="restart"
> >
> > ms ms_myapp1 myapp1 \
> > meta master-max="1" master-node-max="1" clone-max="2"
> clone-node-max="1"
> > notify="true"
> >
> > ms ms_myapp2 myapp2 \
> > meta master-max="1" master-node-max="1" clone-max="2"
> clone-node-max="1"
> > notify="true"
> >
> > ms ms_myapp3 myapp3 \
> > meta master-max="1" master-max-node="1" clone-max="2"
> clone-node-max="1"
> > notify="true"
> >
> > colocation myapp1_col inf: ClusterIP ms_myapp1:Master
> >
> > colocation myapp2_col inf: ClusterIP ms_myapp2:Master
> >
> > colocation myapp3_col inf: ClusterIP ms_myapp3:Master
> >
> > order myapp1_order inf: ms_myapp1:promote ClusterIP:start
> >
> > order myapp2_order inf: ms_myapp2:promote ms_myapp1:start
> >
> > order myapp3_order inf: ms_myapp3:promote ms_myapp2:start
> >
> > property $id="cib-bootstrap-options" \
> > dc-version="1.0.11-db98485d06ed3fe0fe236509f023e1bd4a5566f1" \
> > cluster-infrastructure="Heartbeat" \
> > stonith-enabled="true" \
> > no-quorum-policy="ignore"
> >
> > rsc_defaults $id="rsc-options" \
> > resource-stickiness="100" \
> > migration-threshold="3"
> > *
>
> > I start Heartbeat demon only one of the nodes e.g. mcg1. But
> none of the
> > resources (myapp, myapp1 etc) gets started even on this node.
> > Following is the output of "*crm_mon -f *" command:
> >
> > *Last updated: Mon Oct 17 10:19:22 2011
>
> > Stack: Heartbeat
> > Current DC: mcg1 (3d507250-780f-414a-b674-8c8d84e345cd)-
> partition with
> > quorum
> > Version: 1.0.11-db98485d06ed3fe0fe236509f023e1bd4a5566f1
> > 2 Nodes configured, unknown expected votes
> > 5 Resources configured.
> > ============
> > Node mcg2 (16738ea4-adae-483f-9d79-b0ecce8050f4): UNCLEAN
> (offline)
>
> The cluster is waiting for a successful fencing event before
> starting
> all resources .. the only way to be sure the second node runs no
> resources.
>
> Since you are using suicide pluging this will never happen if
> Heartbeat
> is not started on that node. If this is only a _test_setup_ go
> with ssh
> or even null stonith plugin ... never use them on production
> systems!
>
> Regards,
> Andreas
>
>
> On Mon, Oct 17, 2011 at 4:04 PM, neha chatrath
> <nehachatrath at gmail.com <mailto:nehachatrath at gmail.com>> wrote:
>
> Hello,
> I am configuring a 2 node cluster with following configuration:
>
> *[root at MCG1 init.d]# crm configure show
>
> node $id="16738ea4-adae-483f-9d79-b0ecce8050f4" mcg2 \
> attributes standby="off"
>
> node $id="3d507250-780f-414a-b674-8c8d84e345cd" mcg1 \
> attributes standby="off"
>
> primitive ClusterIP ocf:heartbeat:IPaddr \
> params ip="192.168.1.204" cidr_netmask="255.255.255.0"
> nic="eth0:1" \
>
> op monitor interval="40s" timeout="20s" \
> meta target-role="Started"
>
> primitive app1_fencing stonith:suicide \
> op monitor interval="90" \
> meta target-role="Started"
>
> primitive myapp1 ocf:heartbeat:Redundancy \
> op monitor interval="60s" role="Master" timeout="30s"
> on-fail="standby" \
> op monitor interval="40s" role="Slave" timeout="40s"
> on-fail="restart"
>
> primitive myapp2 ocf:mcg:Redundancy_myapp2 \
> op monitor interval="60" role="Master" timeout="30"
> on-fail="standby" \
> op monitor interval="40" role="Slave" timeout="40"
> on-fail="restart"
>
> primitive myapp3 ocf:mcg:red_app3 \
> op monitor interval="60" role="Master" timeout="30"
> on-fail="fence" \
> op monitor interval="40" role="Slave" timeout="40"
> on-fail="restart"
>
> ms ms_myapp1 myapp1 \
> meta master-max="1" master-node-max="1" clone-max="2"
> clone-node-max="1" notify="true"
>
> ms ms_myapp2 myapp2 \
> meta master-max="1" master-node-max="1" clone-max="2"
> clone-node-max="1" notify="true"
>
> ms ms_myapp3 myapp3 \
> meta master-max="1" master-max-node="1" clone-max="2"
> clone-node-max="1" notify="true"
>
> colocation myapp1_col inf: ClusterIP ms_myapp1:Master
>
> colocation myapp2_col inf: ClusterIP ms_myapp2:Master
>
> colocation myapp3_col inf: ClusterIP ms_myapp3:Master
>
> order myapp1_order inf: ms_myapp1:promote ClusterIP:start
>
> order myapp2_order inf: ms_myapp2:promote ms_myapp1:start
>
> order myapp3_order inf: ms_myapp3:promote ms_myapp2:start
>
> property $id="cib-bootstrap-options" \
> dc-version="1.0.11-db98485d06ed3fe0fe236509f023e1bd4a5566f1" \
> cluster-infrastructure="Heartbeat" \
> stonith-enabled="true" \
> no-quorum-policy="ignore"
>
> rsc_defaults $id="rsc-options" \
> resource-stickiness="100" \
> migration-threshold="3"
> *
> I start Heartbeat demon only one of the nodes e.g. mcg1. But
> none of the resources (myapp, myapp1 etc) gets started even
> on this node.
> Following is the output of "*crm_mon -f *" command:
>
> *Last updated: Mon Oct 17 10:19:22 2011
> Stack: Heartbeat
> Current DC: mcg1 (3d507250-780f-414a-b674-8c8d84e345cd)-
> partition with quorum
> Version: 1.0.11-db98485d06ed3fe0fe236509f023e1bd4a5566f1
> 2 Nodes configured, unknown expected votes
> 5 Resources configured.
> ============
> Node mcg2 (16738ea4-adae-483f-9d79-b0ecce8050f4): UNCLEAN
> (offline)
> Online: [ mcg1 ]
> app1_fencing (stonith:suicide):Started mcg1
>
> Migration summary:
> * Node mcg1:
> *
> When I set "stonith_enabled" as false, then all my resources
> comes up.
>
> Can somebody help me with STONITH configuration?
>
> Cheers
> Neha Chatrath
> KEEP SMILING!!!!
>
>
>
>
>
>
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