[ClusterLabs] CentOS 8 & drbd 9, two drbd devices and colocation

Ken Gaillot kgaillot at redhat.com
Mon Jan 18 16:49:03 EST 2021 

On Mon, 2021-01-18 at 18:43 +0100, fatcharly at gmx.de wrote:
> Hi again,
> 
> I need some help to figure out how to let a two node cluster with two
> drbd-devices start the master-devices on the same node.
> How can I configure colocation to work that way ? I tried to bond one
> drbd-device with the other but that didn't work out quite well.

Once you have the DRBD itself working, you can create a colocation
constraint specifying just the master role. In pcs it's "pcs constraint
colocation add Master <rsc1> with Master <rsc2>".

Keep in mind that the dependent resource (<rsc1>'s master role in this
case) will not be able to start if the other resource is not active. 

> This is my config:
> > > I'm installing a 2 node pacemaker/drbd cluster on a CentOS 8.3.
> > > I'm using this versions:
> > > 
> > > kmod-drbd90-9.0.25-2.el8_3.elrepo.x86_64
> > > drbd90-utils-9.13.1-1.el8.elrepo.x86_64
> > > 
> > > pacemaker-cluster-libs-2.0.4-6.el8.x86_64
> > > pacemaker-cli-2.0.4-6.el8.x86_64
> > > pacemaker-schemas-2.0.4-6.el8.noarch
> > > pacemaker-2.0.4-6.el8.x86_64
> > > pacemaker-libs-2.0.4-6.el8.x86_64
> > > 
> > > clusternode-names are lisbon and susanne
> > > 
> > > Status of the cluster:
> > > Cluster Summary:
> > >   * Stack: corosync
> > >   * Current DC: lisbon (version 2.0.4-6.el8-2deceaa3ae) -
> > > partition with quorum
> > >   * Last updated: Mon Jan 18 16:30:21 2021
> > >   * Last change:  Mon Jan 18 16:30:17 2021 by root via cibadmin
> > > on lisbon
> > >   * 2 nodes configured
> > >   * 7 resource instances configured
> > > 
> > > Node List:
> > >   * Online: [ lisbon susanne ]
> > > 
> > > Active Resources:
> > >   * HA-IP_1     (ocf::heartbeat:IPaddr2):        Started susanne
> > >   * Clone Set: drbd_database-clone [drbd_database] (promotable):
> > >     * Masters: [ susanne ]
> > >     * Slaves: [ lisbon ]
> > >   * fs_database (ocf::heartbeat:Filesystem):     Started susanne
> > >   * Clone Set: drbd_logsfiles-clone [drbd_logsfiles]
> > > (promotable):
> > >     * Masters: [ susanne ]
> > >   * fs_logfiles (ocf::heartbeat:Filesystem):     Started susanne
> > > 
> > > drbdadm status
> > > 
> > > [root at susanne ~]# drbdadm status
> > > drbd1 role:Primary
> > >   disk:UpToDate
> > >   lisbon role:Secondary
> > >     peer-disk:UpToDate
> > > 
> > > drbd2 role:Primary
> > >   disk:UpToDate
> > >   lisbon connection:Connecting
> > > 
> > >  [root at lisbon ~]# drbdadm status
> > > drbd1 role:Secondary
> > >   disk:UpToDate
> > >   susanne role:Primary
> > >     peer-disk:UpToDate
> > > 
> > > 
> > > cluster-config:
> > > Cluster Name: mysql_cluster
> > > Corosync Nodes:
> > >  susanne lisbon
> > > Pacemaker Nodes:
> > >  lisbon susanne
> > > 
> > > Resources:
> > >  Resource: HA-IP_1 (class=ocf provider=heartbeat type=IPaddr2)
> > >   Attributes: cidr_netmask=24 ip=192.168.18.150
> > >   Operations: monitor interval=15s (HA-IP_1-monitor-interval-15s)
> > >               start interval=0s timeout=20s (HA-IP_1-start-
> > > interval-0s)
> > >               stop interval=0s timeout=20s (HA-IP_1-stop-
> > > interval-0s)
> > >  Clone: drbd_database-clone
> > >   Meta Attrs: clone-max=2 clone-node-max=1 notify=true
> > > promotable=true promoted-max=1 promoted-node-max=1
> > >   Resource: drbd_database (class=ocf provider=linbit type=drbd)
> > >    Attributes: drbd_resource=drbd1
> > >    Operations: demote interval=0s timeout=90 (drbd_database-
> > > demote-interval-0s)
> > >                monitor interval=20 role=Slave timeout=20
> > > (drbd_database-monitor-interval-20)
> > >                monitor interval=10 role=Master timeout=20
> > > (drbd_database-monitor-interval-10)
> > >                notify interval=0s timeout=90 (drbd_database-
> > > notify-interval-0s)
> > >                promote interval=0s timeout=90 (drbd_database-
> > > promote-interval-0s)
> > >                reload interval=0s timeout=30 (drbd_database-
> > > reload-interval-0s)
> > >                start interval=0s timeout=240 (drbd_database-
> > > start-interval-0s)
> > >                stop interval=0s timeout=100 (drbd_database-stop-
> > > interval-0s)
> > >  Resource: fs_database (class=ocf provider=heartbeat
> > > type=Filesystem)
> > >   Attributes: device=/dev/drbd1 directory=/mnt/clusterfs1
> > > fstype=ext4
> > >   Operations: monitor interval=20s timeout=40s (fs_database-
> > > monitor-interval-20s)
> > >               start interval=0s timeout=60s (fs_database-start-
> > > interval-0s)
> > >               stop interval=0s timeout=60s (fs_database-stop-
> > > interval-0s)
> > >  Clone: drbd_logsfiles-clone
> > >   Meta Attrs: clone-max=2 clone-node-max=1 notify=true
> > > promotable=true promoted-max=1 promoted-node-max=1
> > >   Resource: drbd_logsfiles (class=ocf provider=linbit type=drbd)
> > >    Attributes: drbd_resource=drbd2
> > >    Operations: demote interval=0s timeout=90 (drbd_logsfiles-
> > > demote-interval-0s)
> > >                monitor interval=20 role=Slave timeout=20
> > > (drbd_logsfiles-monitor-interval-20)
> > >                monitor interval=10 role=Master timeout=20
> > > (drbd_logsfiles-monitor-interval-10)
> > >                notify interval=0s timeout=90 (drbd_logsfiles-
> > > notify-interval-0s)
> > >                promote interval=0s timeout=90 (drbd_logsfiles-
> > > promote-interval-0s)
> > >                reload interval=0s timeout=30 (drbd_logsfiles-
> > > reload-interval-0s)
> > >                start interval=0s timeout=240 (drbd_logsfiles-
> > > start-interval-0s)
> > >                stop interval=0s timeout=100 (drbd_logsfiles-stop-
> > > interval-0s)
> > >  Resource: fs_logfiles (class=ocf provider=heartbeat
> > > type=Filesystem)
> > >   Attributes: device=/dev/drbd2 directory=/mnt/clusterfs2
> > > fstype=ext4
> > >   Operations: monitor interval=20s timeout=40s (fs_logfiles-
> > > monitor-interval-20s)
> > >               start interval=0s timeout=60s (fs_logfiles-start-
> > > interval-0s)
> > >               stop interval=0s timeout=60s (fs_logfiles-stop-
> > > interval-0s)
> > > 
> > > Stonith Devices:
> > > Fencing Levels:
> > > 
> > > Location Constraints:
> > > Ordering Constraints:
> > >   start drbd_database-clone then start fs_database
> > > (kind:Mandatory) (id:order-drbd_database-clone-fs_database-
> > > mandatory)
> > >   start drbd_logsfiles-clone then start fs_logfiles
> > > (kind:Mandatory) (id:order-drbd_logsfiles-clone-fs_logfiles-
> > > mandatory)
> > > Colocation Constraints:
> > >   fs_database with drbd_database-clone (score:INFINITY) (with-
> > > rsc-role:Master) (id:colocation-fs_database-drbd_database-clone-
> > > INFINITY)
> > >   fs_logfiles with drbd_logsfiles-clone (score:INFINITY) (with-
> > > rsc-role:Master) (id:colocation-fs_logfiles-drbd_logsfiles-clone-
> > > INFINITY)
> 
> ERROR:>>>>>  drbd_logsfiles-clone with drbd_database-clone
> (score:INFINITY) (with-rsc-role:Master) (id:colocation-
> drbd_logsfiles-clone-drbd_database-clone-INFINITY)
> > > Ticket Constraints:
> > > 
> > > Alerts:
> > >  No alerts defined
> > > 
> > > Resources Defaults:
> > >   No defaults set
> > > Operations Defaults:
> > >   No defaults set
> > > 
> > > Cluster Properties:
> > >  cluster-infrastructure: corosync
> > >  cluster-name: mysql_cluster
> > >  dc-version: 2.0.4-6.el8-2deceaa3ae
> > >  have-watchdog: false
> > >  last-lrm-refresh: 1610382881
> > >  stonith-enabled: false
> > > 
> > > Tags:
> > >  No tags defined
> > > 
> > > Quorum:
> > >   Options:
> 
> 
> 
> Any suggestions are welcome
> 
> stay safe and healty
> 
> fatcharly
> 
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-- 
Ken Gaillot <kgaillot at redhat.com>

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