[Pacemaker] What exactly happen when a node joins a cluster ?

[Andrew Beekhof]

On Tue, Mar 1, 2011 at 11:22 PM, Thomas Baumann <bt047265 at gmail.com> wrote:
> Hello,
>
> They are  2 groups with identical resources, each group is assigned to
> its own node. Everything is fine for the first startup, but if one
> node stops or starts, the troubles starts.
>
> I guess my problem are the more or less identical resources, it looks
> like if a node joins the resources are started and to be sure they are
> stopped at the other nodes.

They might look started, but Pacemaker didn't do it.

When a node joins, we ask it the status of _every_ configured resource
- to be sure nothing was already running.
You're using lsb scripts though, so starting group_lb1 on a node makes
it look like group_lb2 is running too.
There's also a fair chance you've got these services being started
outside of the cluster when the node boots - also very bad.

Remove group_lb2 and clone group_lb1 instead.

>
> They are 2 loadbalancer with 2 application servers connected.  If
> everything is running application server 1 uses database of
> loadbalancer 1 (as2 uses lb2).  If loadbalcer 1 is not running, I need
> to startup application server 1
> with a different configuration, so it uses the databae od loadbalancer
> 2.  I can't use virtual IP's, I need to reconfigure the application
> servers.
>
> regards,
>
> Thomas
>
> Attached my configuration:
>
> <cib validate-with="pacemaker-1.0" crm_feature_set="3.0.1"
> have-quorum="1" dc-uuid="m-lab-prx-lb-1" admin_epoch="1" epoch="2900"
> num_updates="0" cib-last-written="Fri Feb 25 16:04:35 2011">
>  <configuration>
>    <crm_config>
>      <cluster_property_set id="cib-bootstrap-options">
>        <nvpair id="cib-bootstrap-options-dc-version"
> name="dc-version"
> value="1.0.10-da7075976b5ff0bee71074385f8fd02f296ec8a3"/>
>        <nvpair id="cib-bootstrap-options-cluster-infrastructure"
> name="cluster-infrastructure" value="openais"/>
>        <nvpair id="cib-bootstrap-options-expected-quorum-votes"
> name="expected-quorum-votes" value="4"/>
>        <nvpair id="cib-bootstrap-options-no-quorum-policy"
> name="no-quorum-policy" value="ignore"/>
>        <nvpair id="cib-bootstrap-options-stonith-enabled"
> name="stonith-enabled" value="false"/>
>      </cluster_property_set>
>    </crm_config>
>    <nodes>
>        <node id="m-lab-prx-lb-1" uname="m-lab-prx-lb-1" type="normal"/>
>      <node id="m-lab-prx-lb-2" uname="m-lab-prx-lb-2" type="normal"/>
>      <node id="m-lab-prx-as-1" uname="m-lab-prx-as-1" type="normal"/>
>      <node id="m-lab-prx-as-2" uname="m-lab-prx-as-2" type="normal"/>
>    </nodes>
>    <resources>
>    <group id="group_lb1">
>        <primitive id="res_mysqld_lb1-primitive" class="lsb" type="mysqld">
>                                <operations>
>                                        <op id="op_mysqld_lb1" name="monitor" interval="60s"
> timeout="30s" on-fail="restart"/>
>                                </operations>
>                        </primitive>
>                        <primitive id="res_ser_lb1-primitive" class="lsb" type="kamailio">
>                                <operations>
>                                        <op id="op_ser_lb1" name="monitor" interval="60s" timeout="30s"
> on-fail="restart"/>
>                                </operations>
>                        </primitive>
>                </group>
>                <group id="group_lb2">
>        <primitive id="res_mysqld_lb2-primitive" class="lsb" type="mysqld">
>                                <operations>
>                                        <op id="op_mysqld_lb2" name="monitor" interval="60s"
> timeout="30s" on-fail="restart"/>
>                                </operations>
>                        </primitive>
>                        <primitive id="res_ser_lb2-primitive" class="lsb" type="kamailio">
>                                <operations>
>                                        <op id="op_ser_lb2" name="monitor" interval="60s" timeout="30s"
> on-fail="restart"/>
>                                </operations>
>                        </primitive>
>                </group>
>                </resources>
>    <constraints>
>    <rsc_location id="loc_lb1" rsc="group_lb1">
>        <rule id="rule_loc_lb1" score="-INFINITY">
>          <expression attribute="#uname" id="expression_loc_lb1"
> operation="ne" value="m-lab-prx-lb-1"/>
>        </rule>
>    </rsc_location>
>    <rsc_location id="loc_lb2" rsc="group_lb2">
>        <rule id="rule_loc_lb2" score="-INFINITY">
>          <expression attribute="#uname" id="expression_loc_lb2"
> operation="ne" value="m-lab-prx-lb-2"/>
>        </rule>
>    </rsc_location>
>    </constraints>
>    <rsc_defaults/>
>    <op_defaults/>
>  </configuration>
> </cib>
>
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