[Linux-HA] Master/Slave OCF script

[Andrew Beekhof]

On Mon, Mar 22, 2010 at 12:50 PM, Maciej Lotkowski
<maciej.lotkowski at gmail.com> wrote:
> On Fri, Mar 19, 2010 at 5:16 PM, Lars Ellenberg
> <lars.ellenberg at linbit.com> wrote:
>> On Fri, Mar 19, 2010 at 03:33:09PM +0100, Maciej Lotkowski wrote:
>>> Hi,
>>>
>>> I'm trying to write OCF script for Redis
>>> (http://code.google.com/p/redis/). I need two nodes and master-slave
>>> behavior. My cib.xml looks like this:
>>>
>>> <configuration>
>>>   <crm_config>
>>>     <cluster_property_set id="cib-bootstrap-options">
>>>       <nvpair id="cib-bootstrap-options-dc-version" name="dc-version"
>>> value="1.0.4-2ec1d189f9c23093bf9239a980534b661baf782d"/>
>>         ^^^^^
>>
>>>         <nvpair id="redis-target-role" name="target-role" value="Master"/>
>>                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>
>>> I set master-max to 1, so there should be only one master node, but
>>> after promoting first node Pacemaker keeps trying to promote second
>>> node.
>>
>> Known bug in that version with that target-role.
>> upgrade (or delete the target-role setting, and upgrade anyways).
>
> Thanks. I did upgrade and it works like a charm, but I have a new problem.
>
> I have an ip resource which follows master. In case of master failure,
> Pacemaker demotes and restarts failed Redis resource and then promotes
> a new master. It takes few minutes to start Redis and load a database,
> so for this period of time the ip is down, since there is no master.
> How can I define a rule, which would instruct Pacemaker to first
> promote and move ip resource to the second to node, and then restart
> failed "old" master. I was trying to came up with something, but I
> couldn't find way to specify rule regarding two different nodes.

Its not currently possible I'm afraid.

>
>
>  <configuration>
>    <crm_config>
>      <cluster_property_set id="cib-bootstrap-options">
>        <nvpair id="cib-bootstrap-options-dc-version"
> name="dc-version"
> value="1.0.7-6e1815972fc236825bf3658d7f8451d33227d420"/>
>        <nvpair id="cib-bootstrap-options-cluster-infrastructure"
> name="cluster-infrastructure" value="openais"/>
>        <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"/>
>        <nvpair id="cib-bootstrap-options-expected-quorum-votes"
> name="expected-quorum-votes" value="2"/>
>      </cluster_property_set>
>    </crm_config>
>    <nodes>
>      <node id="noc-test-10" uname="noc-test-10" type="normal"/>
>      <node id="noc-test-20" uname="noc-test-20" type="normal"/>
>    </nodes>
>    <resources>
>      <master id="redis">
>        <meta_attributes id="ms-drbd0-meta_attributes">
>          <nvpair id="ms-drbd0-meta_attributes-clone-max"
> name="clone-max" value="2"/>
>          <nvpair id="ms-drbd0-meta_attributes-notify" name="notify"
> value="false"/>
>          <nvpair id="ms-drbd0-meta_attributes-globally-unique"
> name="globally-unique" value="false"/>
>          <nvpair id="ms-drbd0-meta_attributes-target-role"
> name="target-role" value="Master"/>
>          <nvpair id="redis-unique-5" name="migration-threshold" value="0"/>
>        </meta_attributes>
>        <primitive class="ocf" id="redis-master" provider="linbit"
> type="redis-master">
>          <meta_attributes id="redis-meta-1">
>            <nvpair id="redis-unique-3" name="failure-timeout" value="1s"/>
>            <nvpair id="redis-unique-4" name="migration-threshold" value="0"/>
>          </meta_attributes>
>          <operations>
>            <op id="drbd0-monitor-59s" interval="10s" name="monitor"
> role="Master" timeout="10s" on-fail="block"/>
>            <op id="drbd0-monitor-60s" interval="9s" name="monitor"
> role="Slave" timeout="10s"/>
>            <op id="drbd0-o-2" name="start" interval="0" timeout="10m"/>
>            <op id="drbd0-o-3" name="stop" interval="0" timeout="10s"/>
>
>          </operations>
>        </primitive>
>      </master>
>      <primitive class="ocf" id="ip-lan-1" provider="heartbeat" type="IPaddr2">
>        <instance_attributes id="ip-instance_attributes">
>          <nvpair id="ip-instance_attributes-ip" name="ip" value="10.1.49.138"/>
>          <nvpair id="ip-instance_attributes-nic" name="nic" value="eth1"/>
>          <nvpair id="ip-instance_attributes-cidr_netmask"
> name="cidr_netmask" value="24"/>
>        </instance_attributes>
>        <operations>
>          <op id="ip-monitor-21s" interval="21s" name="monitor" timeout="5s"/>
>        </operations>
>      </primitive>
>    </resources>
>    <constraints>
>      <rsc_order first="redis" first-action="promote"
> id="ms-drbd0-before-storage" score="INFINITY" then="ip-lan-1"
> then-action="start"/>
>      <rsc_colocation id="storage-on-ms-drbd0" rsc="ip-lan-1"
> score="INFINITY" with-rsc="redis" with-rsc-role="Master"/>
>    </constraints>
>  </configuration>
>
>
> --
> Maciej Lotkowski
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