[Pacemaker] how to find on which node the resource is located

[Janec, Jozef]

Hello All,

I'm trying configure solution where one resource will be able know where is the second located.
I have configured one easy resource

<primitive id="rs_ip_s2s" class="ocf" type="IPaddr" provider="heartbeat">
        <instance_attributes id="special-node1" score="5">
                <rule id="node1-special-case" score="INFINITY" >
                        <expression id="node1-special-case-expr" attribute="#uname" operation="eq" value="node1"/>
                </rule>
                <nvpair id="node1-special-case-rule_co" name="rule_co" value="1"/>
        </instance_attributes>
        <instance_attributes id="special-node2" score="4" >
                <rule id="node2-special-case" score="INFINITY">
                        <expression id="node2-special-case-expr" attribute="#uname" operation="eq" value="node2"/>
                </rule>
                <nvpair id="node2-special-case-rule_co" name="rule_co" value="2"/>
        </instance_attributes>
        <instance_attributes id="special-node3" score="3">
                <rule id="node3-special-case" score="INFINITY" >
                        <expression id="node3-special-case-expr" attribute="#uname" operation="eq" value="node3"/>
                </rule>
                <nvpair id="node3-special-case-rule_co" name="rule_co" value="3"/>
        </instance_attributes>
        <instance_attributes id="special-node4" score="2" >
                <rule id="node4-special-case" score="INFINITY">
                        <expression id="node4-special-case-expr" attribute="#uname" operation="eq" value="node4"/>
                </rule>
                <nvpair id="node4-special-case-rule_co" name="rule_co" value="4"/>
        </instance_attributes>
        <instance_attributes id="defaults" score="1" >
                        <nvpair id="rs_ip_s2s-instance_attributes-ip" name="ip" value="10.226.130.48"/>
             </instance_attributes>
</primitive>

But problem is that attribute rule_co isn't globally visible for another resources, I have location rule for second resource

<rsc_location id="M_Master2" rsc="rs_ip_usr">
                <rule id="M_Master2-rule"  boolean-op="and" score="-INFINITY">
                <rule id="M_Master2-rule1"  boolean-op="or" score="1">
                        <expression attribute="#uname" id="M_test2-1" operation="eq" value="node1"/>
                        <expression attribute="#uname" id="M_test2-2" operation="eq" value="node2"/>
                </rule>
                <rule id="M_Master2-rule2"  boolean-op="or" score="2">
                        <expression attribute="rule_co" id="test-31" operation="eq" value="3"/>
                        <expression attribute="rule_co" id="test-32" operation="eq" value="4"/>
                </rule>
                </rule>
</rsc_location>

<rsc_location id="M_Master" rsc="rs_ip_usr">
                <rule id="M_Master-rule"  boolean-op="and" score="-INFINITY">
                <rule id="M_Master-rule1"  boolean-op="or" score="1">
                        <expression attribute="#uname" id="M_test-1" operation="eq" value="node3"/>
                        <expression attribute="#uname" id="M_test-2" operation="eq" value="node4"/>
                </rule>
                <rule id="M_Master-rule2"  boolean-op="or" score="2">
                        <expression attribute="rule_co" id="test-21" operation="eq" value="2"/>
                        <expression attribute="rule_co" id="test-22" operation="eq" value="1"/>
                </rule>
                </rule>
</rsc_location>

But it can't see attribute "rule_co". Is there way how to get the value from the rule_co like rs_ip_s2s.rule_co, or define some global attribute which will be visible for all ?

I'm trying configure situation that the second resource will be able run only on two nodes which are in the same DC where is running resource1

Thanks

Jozef