[Pacemaker] Make 2 nodes failover to each other

[Alister Wong]

Hi, 

 

I am new to Linux cluster, I have a question for 2 nodes cluster.

I want to make cluster with jakarta tomcat, the node will failover to each
other if error detected (e.g. gateway failed to ping)

However, in my current setting, once the node (A) is encountered error, it
will failover to another (B). Then if B encounter failed, it can't fail back
to A. 

Can anyone help me to let the resource failover around once it encountered
error? 

Do I have to do something to make a failed node to be ready to use again? If
it is, can anyone tell me how?

 

Below is my configure:

[root at nmc01-a ~]# crm configure show

node nmc01-a

node nmc01-b

primitive ClusterIP ocf:heartbeat:IPaddr2 \

        params ip="10.214.65.5" cidr_netmask="24" \

        op monitor interval="30s"

primitive Tomcat ocf:heartbeat:tomcat \

        operations $id="Tomcat-operations" \

        op monitor interval="30" timeout="30" \

        op start interval="0" timeout="70" \

        op stop interval="0" timeout="120" \

        params catalina_home="/opt/apache-tomcat-6.0.26"
java_home="/usr/java/jdk1.6.0_21" tomcat_user="nmc" \

        meta target-role="Started"

primitive pingd ocf:pacemaker:pingd \

        params host_list="10.214.65.254" multiplier="100" \

        op monitor interval="60s" timeout="50s" on_fail="restart" \

        op start interval="0" timeout="90" \

        op stop interval="0" timeout="100"

group nmc_web ClusterIP Tomcat

clone pingdclone pingd \

        meta globally-unique="false"

location nmc_web_connected_node nmc_web \

        rule $id="nmc_web_connected_node-rule" -inf: pingd lte 0

property $id="cib-bootstrap-options" \

        dc-version="1.0.9-89bd754939df5150de7cd76835f98fe90851b677" \

        cluster-infrastructure="openais" \

        expected-quorum-votes="2" \

        stonith-enabled="false" \

        no-quorum-policy="ignore" \

        last-lrm-refresh="1283167810"

rsc_defaults $id="rsc-options" \

        resource-stickiness="100"

 

By the way, from pingd example in clusterlab.org.

What does "not_defined pingd" mean in below rule setting?

crm(pingd)configure# location my_web_cluster_on_connected_node
my_web_cluster \

 rule -inf: not_defined pingd or pingd lte 0

 

When I included "not_defined pingd" in my cluster confgiure, if one of the
node hasn't started up. The pingd in that node won't be started and caused 

my other resources (Virtual IP and tomcat) couldn't start up.

 

Thank you.

 

Regards,

Alister

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