[Pacemaker] Question about Pacemaker master/slave and mysql replication

Thu Aug 18 13:57:29 UTC 2011

I don't use this resource in the production. But I think you may to do
experiments with *location *resource.
You also can see my cluster resource Mysql Ping (I use it in the production
for Mysql Master-Master HA)  https://github.com/Sov1et/ocf-mysqlping. And
some explain (in кussian). http://habrahabr.ru/blogs/sysadm/118925/

2011/8/18 Michael Szilagyi <mszilagyi at gmail.com>

> Thanks very much for the link.  The percona mysql script does pretty much
> exactly what I need in regards to master/slave promotion/demotion.  I did
> run into a couple of issues revolving around virtual IPs and how they should
> follow the master/slave(s) around.
>
> The problem that I'm now running into has to do with the grouping of my vip
> for writer/reader.  I'm trying to get it so that the vip_writer will stay
> with the Master sql server and the reader will stay with the Slaves.  I'll
> have N slaves and I only care about having 1 virtual IP for the slaves.  I
> don't care which slave pacemaker picks to have the vip, it just needs to
> pick one.  I've tried to setup some colocation types to map them together
> but I get into states where the Master sql server will be sitting with the
> reader_vip.  I've included my cib output and what the crm_mon is reporting
> my current status to be.  As you can see, the sql master and writer_vip are
> not lined up.
>
> Basically, I now have a cib that looks like this (crm configure show):
>
> node $id="0d6be727-1552-4028-ad8a-cf54b2766da0" three \
> attributes IP="172.17.0.130" standby="off"
> node $id="7deca2cd-9a64-476c-8ea2-372bca859a4f" four \
> attributes IP="172.17.0.131" standby="off"
> node $id="bb15cdbc-8bec-4f64-83bb-8bbd6d4ca1a7" seven \
>  attributes IP="172.17.0.134" standby="off"
> primitive p_sql ocf:percona:MySQL_replication \
> params reader_vip_prefix="reader_vip_"
> ms_replication_resource_name="ms_novaSQL" master_log_file="mysql-bin.000038"
> master_log_pos="106" promoted_coordinates="::" master_host="172.17.0.131" \
>  params super_db_user="root" super_db_password="nova" \
> params repl_db_user="novaSlave" repl_db_password="nova" allowed_sbm="10" \
>  params state_file="/var/run/heartbeat/novaSQL.state"
> recover_file="/var/run/heartbeat/novaSQL.recovery" \
> params p_replication_resource_name="p_sql" \
>  params heartbeat_table="ocf.heartbeat" \
> op monitor interval="10s" role="Master" \
>  op monitor interval="10s" role="Slave"
> primitive reader_vip_1 ocf:heartbeat:IPaddr2 \
> params ip="172.17.0.97" nic="eth0" \
>  meta target-role="Started"
> primitive writer_vip ocf:heartbeat:IPaddr2 \
>  params ip="172.17.0.96" nic="eth0" \
>  meta target-role="Started"
> ms ms_novaSQL p_sql \
> meta master-max="1" master-node-max="1" clone-max="3" clone-node-max="1"
> target-role="Master" notify="false" globally-unique="false"
> colocation reader_vip_coloc_slave inf: ms_novaSQL:Slave reader_vip_1
> colocation writer_vip_coloc_master inf: ms_novaSQL:Master writer_vip
> order order_writer_vip_after_master inf: ms_novaSQL:promote
> writer_vip:start
> property $id="cib-bootstrap-options" \
> dc-version="1.0.9-unknown" \
> cluster-infrastructure="Heartbeat" \
>  stonith-enabled="false" \
> no-quorum-policy="ignore" \
>  last-lrm-refresh="1313615481"
>
> Along with the output from crm_mon.  You can see that the Master sql server
> has the reader_vip and the slave has the writer_vip (which should be
> reversed).
>
> Node four (7deca2cd-9a64-476c-8ea2-372bca859a4f): online
>         p_sql:1 (ocf::percona:MySQL_replication) Master
>         reader_vip_1    (ocf::heartbeat:IPaddr2) Started
>  Node three (0d6be727-1552-4028-ad8a-cf54b2766da0): online
>         p_sql:0 (ocf::percona:MySQL_replication) Slave
>         writer_vip      (ocf::heartbeat:IPaddr2) Started
> Node seven (bb15cdbc-8bec-4f64-83bb-8bbd6d4ca1a7): online
>         p_sql:2 (ocf::percona:MySQL_replication) Slave
>
>
> As always, any ideas/suggestions are appreciated.
>
> -Mike.
>
>
> On Mon, Aug 15, 2011 at 1:04 PM, Viacheslav Biriukov <
> v.v.biriukov at gmail.com> wrote:
>
>> Hello.
>> Check it out https://code.launchpad.net/percona-prm.
>> And presentation:
>> http://www.percona.com/files/presentations/percona-live/nyc-2011/PerconaLiveNYC2011-MySQL-High-Availability-with-Pacemaker.pdf
>>
>> 2011/8/15 Michael Szilagyi <mszilagyi at gmail.com>
>>
>>> I'm already using the mysql RA file from
>>> https://github.com/ClusterLabs/resource-agents/blob/master/heartbeat/mysql(which also seems to have replication support in it).
>>>
>>> Basically what seems to be happening is that pacemaker detects that the
>>> master has dropped and promotes a slave up to master.  However, it is not
>>> properly reconfiguring the slaves with a CHANGE MASTER TO.  I can see some
>>> lines in the ocf file that relate to changing master but it isn't setting it
>>> up properly.  If I login to the slave and issue a CHANGE MASTER TO ... /
>>> START SLAVE then replication will start up normally again.
>>>
>>> Since I can see that the script does allow the master host to get set
>>> when going through set/unset_master I'm hoping it's just something I'm
>>> missing and not a limitation of using Pacemaker to manage the sql
>>> replication cluster.
>>>
>>> Hopefully someone can point me at what I am missing.
>>>
>>> -Mike.
>>>
>>> On Mon, Aug 15, 2011 at 1:56 AM, Dan Frincu <df.cluster at gmail.com>wrote:
>>>
>>>> Hi,
>>>>
>>>> On Sat, Aug 13, 2011 at 2:53 AM, Michael Szilagyi <mszilagyi at gmail.com>
>>>> wrote:
>>>> > I'm new to Pacemaker and trying to understand exactly what it can and
>>>> can't
>>>> > do.
>>>> > I currently have a small, mysql master/slave cluster setup that is
>>>> getting
>>>> > monitored within Heartbeat/Pacemaker:  What I'd like to be able to do
>>>> (and
>>>> > am hoping Pacemaker will do) is to have 1 node designated as Master
>>>> and in
>>>> > the event of a failure, automatically promote a slave to master and
>>>> realign
>>>> > all of the existing slaves to be slaves of the newly promoted master.
>>>> >  Currently what seems to be happening, however, is heartbeat correctly
>>>> sees
>>>> > that a node goes down and pacemaker promotes it up to master but the
>>>> > replication is not adjusted so that it is now feeding everyone else.
>>>>  It
>>>> > seems like this should be possible to do from within Pacemaker but I
>>>> feel
>>>> > like I'm missing a part of the puzzle.  Any suggestions would be
>>>> > appreciated.
>>>>
>>>> You could try the mysql RA => from
>>>> https://github.com/fghaas/resource-agents/blob/master/heartbeat/mysql
>>>> Last I heard, it had replication support.
>>>>
>>>> HTH.
>>>>
>>>> >
>>>> > Here's an output of my crm configure show:
>>>> > node $id="7deca2cd-9a64-476c-8ea2-372bca859a4f" four \
>>>> > attributes 172.17.0.130-log-file-p_sql="mysql-bin.000013"
>>>> > 172.17.0.130-log-pos-p_sql="632"
>>>> > node $id="9b355ab7-8c81-485c-8dcd-1facedde5d03" three \
>>>> > attributes 172.17.0.131-log-file-p_sql="mysql-bin.000020"
>>>> > 172.17.0.131-log-pos-p_sql="106"
>>>> > primitive p_sql ocf:heartbeat:mysql \
>>>> > params config="/etc/mysql/my.cnf" binary="/usr/bin/mysqld_safe"
>>>> > datadir="/var/lib/mysql" \
>>>> > params pid="/var/lib/mysql/novaSQL.pid"
>>>> socket="/var/run/mysqld/mysqld.sock"
>>>> > \
>>>> > params max_slave_lag="120" \
>>>> > params replication_user="novaSlave" replication_passwd="nova" \
>>>> > params additional_parameters="--skip-external-locking
>>>> > --relay-log=novaSQL-relay-bin --relay-log-index=relay-bin.index
>>>> > --relay-log-info-file=relay-bin.info" \
>>>> > op start interval="0" timeout="120" \
>>>> > op stop interval="0" timeout="120" \
>>>> > op promote interval="0" timeout="120" \
>>>> > op demote interval="0" timeout="120" \
>>>> > op monitor interval="10" role="Master" timeout="30" \
>>>> > op monitor interval="30" role="Slave" timeout="30"
>>>> > primitive p_sqlIP ocf:heartbeat:IPaddr2 \
>>>> > params ip="172.17.0.96" \
>>>> > op monitor interval="10s"
>>>> > ms ms_sql p_sql \
>>>> > meta target-role="Started" is-managed="true"
>>>> > location l_sqlMaster p_sqlIP 10: three
>>>> > location l_sqlSlave1 p_sqlIP 5: four
>>>> > property $id="cib-bootstrap-options" \
>>>> > dc-version="1.0.9-unknown" \
>>>> > cluster-infrastructure="Heartbeat" \
>>>> > stonith-enabled="false" \
>>>> > no-quorum-policy="ignore" \
>>>> > last-lrm-refresh="1313187103"
>>>> >
>>>> > Thanks!
>>>> > -Mike.
>>>> > _______________________________________________
>>>> > Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>> > http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>> >
>>>> > Project Home: http://www.clusterlabs.org
>>>> > Getting started:
>>>> http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>> > Bugs:
>>>> >
>>>> http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
>>>> >
>>>> >
>>>>
>>>>
>>>>
>>>> --
>>>> Dan Frincu
>>>> CCNA, RHCE
>>>>
>>>> _______________________________________________
>>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>>
>>>> Project Home: http://www.clusterlabs.org
>>>> Getting started:
>>>> http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>> Bugs:
>>>> http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
>>>>
>>>
>>>
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>>>
>>> Project Home: http://www.clusterlabs.org
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>>> Bugs:
>>> http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
>>>
>>>
>>
>>
>> --
>> Viacheslav Biriukov
>> BR
>> http://biriukov.com
>>
>>
>> _______________________________________________
>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>
>> Project Home: http://www.clusterlabs.org
>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>> Bugs:
>> http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
>>
>>
>
> _______________________________________________
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> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>
> Project Home: http://www.clusterlabs.org
> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
> Bugs:
> http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
>
>

-- 
Viacheslav Biriukov
BR
http://biriukov.com
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