[Pacemaker] Re: Understanding rules: location, colocation, order. Using with Master/Slave

[Adrian Chapela]

> Hello!
>
> I am working on a cluster with a two Master/Slave instances.
>
> I have: 2 drbd Master/Slave instance, 1 pingd clone instance, 1 group 
> with Filesystem resource.
>
> ms-drbd0 is the first Master/Slave
> ms-drbd1 is the second Master/Slave
> mail_Group is the first group, it depends on ms-drbd0
> samba_Group is the second group, it depends on ms-drbd1
>
> I have the next rules:
>
> <rsc_order id="mail-drbd0_before_fs0" from="Montaxe_mail" 
> action="start" to="ms-drbd0" to_action="promote"/>
> <rsc_order id="samba-drbd1_before_fs0" from="Montaxe_samba" 
> action="start" to="ms-drbd1" to_action="promote"/>
> (starts Montaxe_mail when ms-drbd0 has been promoted, start 
> Montaxe_samba when ms-drbd1 has been promoted. These rules are ok, I 
> think)
>
> <rsc_colocation id="mail_Group_on_ms-drbd0" to="ms-drbd0" 
> to_role="master" from="mail_Group" score="INFINITY"/>
> <rsc_colocation id="samba_Group_on_ms-drbd1" to="ms-drbd1" 
> to_role="master" from="samba_Group" score="INFINITY"/>
> (Run mail_Group only on the master node, run samba_Group on the master 
> node)
>
> <rsc_location id="mail:drbd" rsc="ms-drbd0">
> <rule id="rule:ms-drbd0" role="master" score="100">
>     <expression  attribute="#uname" operation="eq" 
> value="debianquagga2"/>
> </rule>
> <rule id="mail_Group:pingd:rule" score="-INFINITY" boolean_op="or">
>      <expression id="mail_Group:pingd:expr:undefined" 
> attribute="pingd" operation="not_defined"/>
>      <expression id="mail_Group:pingd:expr:zero" attribute="pingd" 
> operation="lte" value="0"/>
> </rule>
> </rsc_location>
> <rsc_location id="samba:drbd" rsc="ms-drbd1">
> <rule id="rule:ms-drbd1" role="master" score="100">
>     <expression  attribute="#uname" operation="eq" 
> value="debianquagga2"/>
> </rule>
> <rule id="samba_Group:pingd:rule" score="-INFINITY" boolean_op="or">
>      <expression id="samba_Group:pingd:expr:undefined" 
> attribute="pingd" operation="not_defined"/>
>      <expression id="samba_Group:pingd:expr:zero" attribute="pingd" 
> operation="lte" value="0"/>
> </rule>
> </rsc_location>
> (Select debianquagga2 as Master and if the node lost its connection 
> take the score -INFINITY to do failover, it applies to ms-drbd0 and 
> ms-drbd1)
>
> With this rules all is working very well but the node selected as 
> master isn't "debianquagga2",   Why could be the reason ?
>
> I using Heartbeat 2.1.4
>

I have attached the cib xml file. If I delete two groups, Master is 
debianQuagga2, If not, Master is debianQuagga1.
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