Hello all,
I have some questions about resource location and colocation constraints.
I'm trying to set up a proof of concept configuration with some multistate
resources using the Stateful RA. I'm currently using Linux HA 2.1.4.
The behavior I'd like to have is to for say, 5 servers to run 5 resources
with each resource consisting of 2 clones, one of which is master and the
other is slave (left in the started state). I'd like for these resources to
be distributed among nodes in a cluster to the best extent possible meaning
that each node should run the fewest number of resources possible while
always running 2 clones of each resource. I'd also like resources to be
redistributed when a server goes offline and comes back.
One more thing. I'd like for the CRM to promote a slave to a master and
reassign the slave role to another node in the event of a failure.
I've run into 3 problems:
1. I tried setting resource colocation constraints with negative
scores so that the CRM attempts to distribute resources among all the
servers. The problem is that the base weight score for each resource is 0
so when the negative score is applied, many of the resources cannot run
anywhere.
2. If a node running the master instance of a given resource dies, CRM
picks another server and starts the master resource on that server instead
of promoting the slave to be master and picking a new slave.
3. If a node goes offline and comes back, the CRM does not
redistribute resources to that server, despite setting resource_stickiness
to 0 on all of the resources.
Can you help me with these issues? Thanks in advance!
Here is my configuration:
<resources>
<master_slave id="ms_stateful_1">
<primitive id="stateful1" class="ocf" provider="heartbeat"
type="Stateful"/>
<instance_attributes id="params-stateful1">
<attributes>
<nvpair id="stateful1-clone-max" name="clone_max" value="2"/>
<nvpair id="stateful1-clone-node-max" name="clone_node_max"
value="1"/>
<nvpair id="stateful1-master-max" name="master_max" value="1"/>
<nvpair id="stateful1-master-node-max" name="master_node_max"
value="1"/>
<nvpair id="stateful1-resource-stickiness"
name="resource_stickiness" value="0"/>
</attributes>
</instance_attributes>
</master_slave>
<master_slave id="ms_stateful_2">
<primitive id="stateful2" class="ocf" provider="heartbeat"
type="Stateful"/>
<instance_attributes id="params-stateful2">
<attributes>
<nvpair id="stateful2-clone-max" name="clone_max" value="2"/>
<nvpair id="stateful2-clone-node-max" name="clone_node_max"
value="1"/>
<nvpair id="stateful2-master-max" name="master_max" value="1"/>
<nvpair id="stateful2-master-node-max" name="master_node_max"
value="1"/>
<nvpair id="stateful2-resource-stickiness"
name="resource_stickiness" value="0"/>
</attributes>
</instance_attributes>
</master_slave>
<master_slave id="ms_stateful_3">
<primitive id="stateful3" class="ocf" provider="heartbeat"
type="Stateful"/>
<instance_attributes id="params-stateful3">
<attributes>
<nvpair id="stateful3-clone-max" name="clone_max" value="2"/>
<nvpair id="stateful3-clone-node-max" name="clone_node_max"
value="1"/>
<nvpair id="stateful3-master-max" name="master_max" value="1"/>
<nvpair id="stateful3-master-node-max" name="master_node_max"
value="1"/>
<nvpair id="stateful3-resource-stickiness"
name="resource_stickiness" value="0"/>
</attributes>
</instance_attributes>
</master_slave>
<master_slave id="ms_stateful_4">
<primitive id="stateful4" class="ocf" provider="heartbeat"
type="Stateful"/>
<instance_attributes id="params-stateful4">
<attributes>
<nvpair id="stateful4-clone-max" name="clone_max" value="2"/>
<nvpair id="stateful4-clone-node-max" name="clone_node_max"
value="1"/>
<nvpair id="stateful4-master-max" name="master_max" value="1"/>
<nvpair id="stateful4-master-node-max" name="master_node_max"
value="1"/>
<nvpair id="stateful4-resource-stickiness"
name="resource_stickiness" value="0"/>
</attributes>
</instance_attributes>
</master_slave>
<master_slave id="ms_stateful_5">
<primitive id="stateful5" class="ocf" provider="heartbeat"
type="Stateful"/>
<instance_attributes id="params-stateful5">
<attributes>
<nvpair id="stateful5-clone-max" name="clone_max" value="2"/>
<nvpair id="stateful5-clone-node-max" name="clone_node_max"
value="1"/>
<nvpair id="stateful5-master-max" name="master_max" value="1"/>
<nvpair id="stateful5-master-node-max" name="master_node_max"
value="1"/>
<nvpair id="stateful5-resource-stickiness"
name="resource_stickiness" value="0"/>
</attributes>
</instance_attributes>
</master_slave>
</resources>
<constraints>
<rsc_colocation id="stateful1_2" from="ms_stateful_1" to="ms_stateful_2"
score="-1000"/>
<rsc_colocation id="stateful1_3" from="ms_stateful_1" to="ms_stateful_3"
score="-1000"/>
<rsc_colocation id="stateful1_4" from="ms_stateful_1" to="ms_stateful_4"
score="-1000"/>
<rsc_colocation id="stateful1_5" from="ms_stateful_1" to="ms_stateful_5"
score="-1000"/>
<rsc_colocation id="stateful2_1" from="ms_stateful_2" to="ms_stateful_1"
score="-1000"/>
<rsc_colocation id="stateful2_3" from="ms_stateful_2" to="ms_stateful_3"
score="-1000"/>
<rsc_colocation id="stateful2_4" from="ms_stateful_2" to="ms_stateful_4"
score="-1000"/>
<rsc_colocation id="stateful2_5" from="ms_stateful_2" to="ms_stateful_5"
score="-1000"/>
<rsc_colocation id="stateful3_1" from="ms_stateful_3" to="ms_stateful_1"
score="-1000"/>
<rsc_colocation id="stateful3_2" from="ms_stateful_3" to="ms_stateful_2"
score="-1000"/>
<rsc_colocation id="stateful3_4" from="ms_stateful_3" to="ms_stateful_4"
score="-1000"/>
<rsc_colocation id="stateful3_5" from="ms_stateful_3" to="ms_stateful_5"
score="-1000"/>
<rsc_colocation id="stateful4_1" from="ms_stateful_4" to="ms_stateful_1"
score="-1000"/>
<rsc_colocation id="stateful4_2" from="ms_stateful_4" to="ms_stateful_2"
score="-1000"/>
<rsc_colocation id="stateful4_3" from="ms_stateful_4" to="ms_stateful_3"
score="-1000"/>
<rsc_colocation id="stateful4_5" from="ms_stateful_4" to="ms_stateful_5"
score="-1000"/>
<rsc_colocation id="stateful5_1" from="ms_stateful_5" to="ms_stateful_1"
score="-1000"/>
<rsc_colocation id="stateful5_2" from="ms_stateful_5" to="ms_stateful_2"
score="-1000"/>
<rsc_colocation id="stateful5_3" from="ms_stateful_5" to="ms_stateful_3"
score="-1000"/>
<rsc_colocation id="stateful5_4" from="ms_stateful_5" to="ms_stateful_4"
score="-1000"/>
</constraints>
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