[Pacemaker] [Linux-HA] Better way to change master in 3 node pgsql cluster

[Andrew Beekhof]

On 13 Jan 2014, at 8:32 pm, Andrey Rogovsky <a.rogovsky at gmail.com> wrote:

> Hi
> 
> I have 3 node postgresql cluster.
> It work well. But I have some trobule with change master.
> 
> For now, if I need change master, I must:
> 1) Stop PGSQL on each node and cluster service
> 2) Start Setup new manual PGSQL replication
> 3) Change attributes on each node for point to new master
> 4) Stop PGSQL on each node
> 5) Celanup resource and start cluster service
> 
> It take a lot of time. Is it exist better way to change master?

Newer versions support:

   crm_resource --resource msPostgresql --ban --master --host a.geocluster.e-autopay.com

> 
> 
> 
> This is my cluster service status:
> Node Attributes:
> * Node a.geocluster.e-autopay.com:
>    + master-pgsql:0                   : 1000
>    + pgsql-data-status               : LATEST
>    + pgsql-master-baseline           : 000000002F000090
>    + pgsql-status                     : PRI
> * Node c.geocluster.e-autopay.com:
>    + master-pgsql:0                   : 1000
>    + pgsql-data-status               : SYNC
>    + pgsql-status                     : STOP
> * Node b.geocluster.e-autopay.com:
>    + master-pgsql:0                   : 1000
>    + pgsql-data-status               : SYNC
>    + pgsql-status                     : STOP
> 
> I was use http://clusterlabs.org/wiki/PgSQL_Replicated_Cluster for my 3
> nodes cluster without hard stik.
> Now I got strange situation all nodes stay slave:
> ============
> Last updated: Sat Dec  7 04:33:47 2013
> Last change: Sat Dec  7 12:56:23 2013 via crmd on a
> Stack: openais
> Current DC: c - partition with quorum
> Version: 1.1.7-ee0730e13d124c3d58f00016c3376a1de5323cff
> 5 Nodes configured, 3 expected votes
> 4 Resources configured.
> ============
> 
> Online: [ a c b ]
> 
> Master/Slave Set: msPostgresql [pgsql]
>     Slaves: [ a c b ]
> 
> My config is:
> node a \
> attributes pgsql-data-status="DISCONNECT"
> node b \
> attributes pgsql-data-status="DISCONNECT"
> node c \
> attributes pgsql-data-status="DISCONNECT"
> primitive pgsql ocf:heartbeat:pgsql \
> params pgctl="/usr/lib/postgresql/9.3/bin/pg_ctl" psql="/usr/bin/psql"
> pgdata="/var/lib/postgresql/9.3/main" start_opt="-p 5432" rep_mode="sync"
> node_list="a b c" restore_command="cp /var/lib/postgresql/9.3/pg_archive/%f
> %p" master_ip="192.168.10.200" restart_on_promote="true"
> config="/etc/postgresql/9.3/main/postgresql.conf" \
> op start interval="0s" timeout="60s" on-fail="restart" \
> op monitor interval="4s" timeout="60s" on-fail="restart" \
> op monitor interval="3s" role="Master" timeout="60s" on-fail="restart" \
> op promote interval="0s" timeout="60s" on-fail="restart" \
> op demote interval="0s" timeout="60s" on-fail="stop" \
> op stop interval="0s" timeout="60s" on-fail="block" \
> op notify interval="0s" timeout="60s"
> primitive pgsql-master-ip ocf:heartbeat:IPaddr2 \
> params ip="192.168.10.200" nic="peervpn0" \
> op start interval="0s" timeout="60s" on-fail="restart" \
> op monitor interval="10s" timeout="60s" on-fail="restart" \
> op stop interval="0s" timeout="60s" on-fail="block"
> group master pgsql-master-ip
> ms msPostgresql pgsql \
> meta master-max="1" master-node-max="1" clone-max="3" clone-node-max="1"
> notify="true"
> colocation set_ip inf: master msPostgresql:Master
> order ip_down 0: msPostgresql:demote master:stop symmetrical=false
> order ip_up 0: msPostgresql:promote master:start symmetrical=false
> property $id="cib-bootstrap-options" \
> dc-version="1.1.7-ee0730e13d124c3d58f00016c3376a1de5323cff" \
> cluster-infrastructure="openais" \
> expected-quorum-votes="3" \
> no-quorum-policy="ignore" \
> stonith-enabled="false" \
> crmd-transition-delay="0" \
> last-lrm-refresh="1386404222"
> rsc_defaults $id="rsc-options" \
> resource-stickiness="100" \
> migration-threshold="1"
> _______________________________________________
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> Linux-HA at lists.linux-ha.org
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> See also: http://linux-ha.org/ReportingProblems

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