[Pacemaker] MySQL HA with pacemaker and DRBD - How to monitor mysql service
Andreas Kurz
andreas at hastexo.com
Thu Mar 22 10:48:18 EDT 2012
On 03/22/2012 03:23 PM, coma wrote:
> Thank you for your responses,
>
> I have added the migration-treshold on my mysqld ressource, when i kill
> or manually stop mysql on one node, there is not failover on the second
> node.
> Also, when i look crm_mon --failcounts, i can see "mysqld:
> migration-threshold=1000000 fail-count=1000000", so i don"t anderstand
> why migration-threshold not equal 2?
>
> Migration summary:
> * Node node1:
> mysqld: migration-threshold=1000000 fail-count=1000000
> * Node node2:
>
> Failed actions:
> mysqld_monitor_10000 (node=node1, call=90, rc=7, status=complete):
> not running
> mysqld_stop_0 (node=node1, call=93, rc=1, status=complete): unknown
> error
The lsb init script you are using seems to be not LSB compliant ...
looks like it returns an error on stopping an already stopped mysql.
http://clusterlabs.org/doc/en-US/Pacemaker/1.1/html-single/Pacemaker_Explained/index.html#ap-lsb
Fix the script ... or better use the ocf resource agent.
Regards,
Andreas
--
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>
>
>
> configuration:
>
> node node1 \
> attributes standby="off"
> node node2 \
> attributes standby="off"
> primitive Cluster-VIP ocf:heartbeat:IPaddr2 \
> params ip="x.x.x.x" broadcast="x.x.x.x" nic="eth0"
> cidr_netmask="21" iflabel="VIP1" \
> op monitor interval="10s" timeout="20s" \
> meta is-managed="true"
> primitive datavg ocf:heartbeat:LVM \
> params volgrpname="datavg" exclusive="true" \
> op start interval="0" timeout="30" \
> op stop interval="0" timeout="30"
> primitive drbd_mysql ocf:linbit:drbd \
> params drbd_resource="drbd-mysql" \
> op monitor interval="15s"
> primitive fs_mysql ocf:heartbeat:Filesystem \
> params device="/dev/datavg/data" directory="/data" fstype="ext3"
> primitive mysqld lsb:mysqld \
> op monitor interval="10s" timeout="30s" \
> op start interval="0" timeout="120" \
> op stop interval="0" timeout="120" \
> meta target-role="Started" migration-threshold="2"
> failure-timeout="20s"
> group mysql datavg fs_mysql Cluster-VIP mysqld
> ms ms_drbd_mysql drbd_mysql \
> meta master-max="1" master-node-max="1" clone-max="2"
> clone-node-max="1" notify="true"
> location master-prefer-node-1 Cluster-VIP 25: node1
> colocation mysql_on_drbd inf: mysql ms_drbd_mysql:Master
> order mysql_after_drbd inf: ms_drbd_mysql:promote mysql:start
> property $id="cib-bootstrap-options" \
>
> dc-version="1.1.5-1.1.el5-01e86afaaa6d4a8c4836f68df80ababd6ca3902f" \
> cluster-infrastructure="openais" \
> expected-quorum-votes="2" \
> stonith-enabled="false" \
> no-quorum-policy="ignore" \
> last-lrm-refresh="1332425337"
> rsc_defaults $id="rsc-options" \
> resource-stickiness="100"
>
>
>
> 2012/3/22 Andreas Kurz <andreas at hastexo.com <mailto:andreas at hastexo.com>>
>
> On 03/22/2012 01:51 PM, coma wrote:
> > Ah yes thank you, the service status mysql is now monitored, but the
> > failover is not performed?
>
> As long as local restarts are successful there is no need for a failover
> ... there is migration-treshold to limit local restart tries.
>
> Regards,
> Andreas
>
> --
> Need help with Pacemaker?
> http://www.hastexo.com/now
>
> >
> >
> >
> > 2012/3/22 emmanuel segura <emi2fast at gmail.com
> <mailto:emi2fast at gmail.com> <mailto:emi2fast at gmail.com
> <mailto:emi2fast at gmail.com>>>
> >
> > sorry
> > I think you missed the op monitor operetion in your primitive
> definition
> >
> >
> >
> > Il giorno 22 marzo 2012 11:52, emmanuel segura
> <emi2fast at gmail.com <mailto:emi2fast at gmail.com>
> > <mailto:emi2fast at gmail.com <mailto:emi2fast at gmail.com>>> ha
> scritto:
> >
> > I think you missed the op monitor operetion you primitive
> definition
> >
> > Il giorno 22 marzo 2012 11:33, coma <coma.inf at gmail.com
> <mailto:coma.inf at gmail.com>
> > <mailto:coma.inf at gmail.com <mailto:coma.inf at gmail.com>>>
> ha scritto:
> >
> > Hello,
> >
> > I have a question about mysql service monitoring into a
> > MySQL HA cluster with pacemaker and DRBD,
> > I have set up a configuration to allow a failover between
> > two nodes, it work fine when a node is offline (or
> standby),
> > but i want to know if it is possible to monitor the mysql
> > service to perform a failover if mysql is stopped or
> > unavailable?
> >
> > Thank you in advance for any response.
> >
> > My crm configuration:
> >
> > node node1 \
> > attributes standby="off"
> > node node2 \
> > attributes standby="off"
> > primitive Cluster-VIP ocf:heartbeat:IPaddr2 \
> > params ip="x.x.x.x" broadcast="x.x.x.x" nic="eth0"
> > cidr_netmask="21" iflabel="VIP1" \
> > op monitor interval="10s" timeout="20s" \
> > meta is-managed="true"
> > primitive datavg ocf:heartbeat:LVM \
> > params volgrpname="datavg" exclusive="true" \
> > op start interval="0" timeout="30" \
> > op stop interval="0" timeout="30"
> > primitive drbd_mysql ocf:linbit:drbd \
> > params drbd_resource="drbd-mysql" \
> > op monitor interval="15s"
> > primitive fs_mysql ocf:heartbeat:Filesystem \
> > params device="/dev/datavg/data" directory="/data"
> > fstype="ext3"
> > primitive mysqld lsb:mysqld
> > group mysql datavg fs_mysql Cluster-VIP mysqld
> > ms ms_drbd_mysql drbd_mysql \
> > meta master-max="1" master-node-max="1"
> > clone-max="2" clone-node-max="1" notify="true"
> > location master-prefer-node-1 Cluster-VIP 25: node1
> > colocation mysql_on_drbd inf: mysql ms_drbd_mysql:Master
> > order mysql_after_drbd inf: ms_drbd_mysql:promote
> mysql:start
> > property $id="cib-bootstrap-options" \
> >
> >
> dc-version="1.1.5-1.1.el5-01e86afaaa6d4a8c4836f68df80ababd6ca3902f"
> > \
> > cluster-infrastructure="openais" \
> > expected-quorum-votes="2" \
> > stonith-enabled="false" \
> > no-quorum-policy="ignore" \
> > last-lrm-refresh="1332254494"
> > rsc_defaults $id="rsc-options" \
> > resource-stickiness="100"
> >
> >
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> >
> >
> > --
> > esta es mi vida e me la vivo hasta que dios quiera
> >
> >
> >
> >
> > --
> > esta es mi vida e me la vivo hasta que dios quiera
> >
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