[Linux-HA] Failback leaves processes running on the backup

[Andrew Beekhof]

On Nov 8, 2007, at 9:39 PM, Anders Brownworth wrote:

> Hi,
>
> I have a working linux-ha v2 setup managing 2 production IPs with a  
> service (OpenSER) using those IPs. The service is shared amongst two  
> servers (box01 and box02) in an active / standby configuration.  
> OpenSER and the production IPs prefer to run on box01 but will  
> migrate to box02 in the event of a box01 failure. All of this works  
> as expected.
>
> However, when OpenSER is running on the backup box (box02) and the  
> primary (box01) becomes available, the backup box releases the IPs  
> as expected but never shuts OpenSER down.

The only way I can think that might happen is if either:
  - the cluster didn't think it was running in the first place
  - the OpenSER RA ignored the stop command

Either way it would be the fault of the RA.
Have you tested it with ocf-tester ?

(Ok, yes it's possible there is a bug in the crm but this particular  
behavior is pretty solid.)

If you attach logs from the event and we'll know for sure.

> OpenSER is then running on both the primary and the backup box,  
> although of course the backup box never gets any requests because  
> the production IPs are gone. It makes for a confusing environment  
> though when you see the OpenSER processes running on the backup but  
> there seems to be no traffic.
>
> Am I wrong to expect that a service should be shut down when moving  
> away from a server? Clearly IPaddr2 yanks the production IPs away...
>
> In the constraints I score OpenSER to 100 so it prefers to live on  
> box01. I also tie IPAddr2 and OpenSER together at a score of  
> INFINITY so they stay together. I'm assuming this is the correct way  
> to keep IP and service together and have the service prefer box01.  
> Perhaps my implementation isn't stating what I am wanting to do?
>
> Below is my cib.xml. Any insight is greatly appreciated.
>
> -Anders
>
>
>
> <cib admin_epoch="1" have_quorum="true" num_peers="1"  
> cib_feature_revision="1.3" ignore_dtd="false" generated="true"  
> epoch="15" num_updates="367" cib-last-written="Thu Nov  8 19:08:20  
> 2007" ccm_transition="1" dc_uuid="9052abe5-87ee-4400-a008- 
> c5f13205e94b">
>  <configuration>
>    <crm_config>
>      <cluster_property_set id="cluster-property-set">
>        <attributes>
>          <nvpair id="short_resource_names"  
> name="short_resource_names" value="true"/>
>          <nvpair id="pe-input-series-max" name="pe-input-series-max"  
> value="-1"/>
>        </attributes>
>      </cluster_property_set>
>    </crm_config>
>    <nodes>
>      <node id="9052abe5-87ee-4400-a008-c5f13205e94b" uname="box01"  
> type="normal"/>
>      <node id="47658455-4da2-48d4-a8da-419b2f93f039" uname="box02"  
> type="normal"/>
>    </nodes>
>    <resources>
>      <group id="OpenSer_IPaddr2_group">
>        <primitive id="IPaddr2-10.1.53.235" class="ocf"  
> type="IPaddr2" provider="heartbeat">
>          <operations>
>            <op id="ipaddr2-10.1.53.235-monitor" name="monitor"  
> interval="5s" timeout="3s"/>
>          </operations>
>          <instance_attributes id="IPaddr2-10.1.53.235-attributes">
>            <attributes>
>              <nvpair id="ipaddr2-10.1.53.235-ip" name="ip"  
> value="10.1.53.235"/>
>              <nvpair id="ipaddr2-10.1.53.235-broadcast"  
> name="broadcast" value="10.1.53.255"/>
>              <nvpair id="ipaddr2-10.1.53.235-cidr_netmask"  
> name="cidr_netmask" value="24"/>
>            </attributes>
>          </instance_attributes>
>        </primitive>
>        <primitive id="IPaddr2-10.1.53.236" class="ocf"  
> type="IPaddr2" provider="heartbeat">
>          <operations>
>            <op id="ipaddr2-10.1.53.236-monitor" name="monitor"  
> interval="5s" timeout="3s"/>
>          </operations>
>          <instance_attributes id="IPaddr2-10.1.53.236-attributes">
>            <attributes>
>              <nvpair id="ipaddr2-10.1.53.236-ip" name="ip"  
> value="10.1.53.236"/>
>              <nvpair id="ipaddr2-10.1.53.236-broadcast"  
> name="broadcast" value="10.1.53.255"/>
>              <nvpair id="ipaddr2-10.1.53.236-cidr_netmask"  
> name="cidr_netmask" value="24"/>
>            </attributes>
>          </instance_attributes>
>        </primitive>
>        <primitive id="OpenSer" class="ocf" type="OpenSer"  
> provider="bandwidth.com">
>          <operations>
>            <op id="openser-start" name="start" timeout="5s"/>
>            <op id="openser-stop" name="stop" timeout="3s"/>
>            <op id="openser-monitor" name="monitor" interval="10s"  
> timeout="3s">
>              <instance_attributes id="monitor_10s">
>                <attributes>
>                  <nvpair id="openser-monitor-ip" name="ip"  
> value="127.0.0.1"/>
>                </attributes>
>              </instance_attributes>
>            </op>
>          </operations>
>        </primitive>
>      </group>
>    </resources>
>    <constraints>
>      <rsc_location id="IPaddr2_resource_location" rsc="IPaddr2">
>        <rule id="IPaddr2_rule" score="100">
>          <expression id="expression_1" attribute="#uname"  
> operation="eq" value="box01"/>
>        </rule>
>      </rsc_location>
>      <rsc_colocation id="same_openser_ip" from="IPaddr2"  
> to="OpenSer" score="INFINITY"/>
>    </constraints>
>  </configuration>
> </cib>
>
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