[ClusterLabs] 2 node mariadb-cluster - constraint-problems ?
fatcharly at gmx.de
fatcharly at gmx.de
Wed May 12 10:01:00 EDT 2021
Hi Andrei, Hi everybody,
> You need order fs_database after promote operation; and as I just found
> pacemaker also does not reverse it correctly and executes fs stop and
> drbd demote concurrently. So you need additional order constraint to
> first stop fs then demote drbd.
is there so good doku about this, I don't know how to archive a "after promote operation" and how can I tell the pcs to first dismount the filesystem mountpoint and then demote the drbd-device.
Sorry but this is new for me.
Best regards and take care
fatcharly
> Gesendet: Dienstag, 11. Mai 2021 um 17:19 Uhr
> Von: "Andrei Borzenkov" <arvidjaar at gmail.com>
> An: users at clusterlabs.org
> Betreff: Re: [ClusterLabs] 2 node mariadb-cluster - constraint-problems ?
>
> On 11.05.2021 17:43, fatcharly at gmx.de wrote:
> > Hi,
> >
> > I'm using a CentOS 8.3.2011 with a pacemaker-2.0.4-6.el8_3.1.x86_64 + corosync-3.0.3-4.el8.x86_64 and kmod-drbd90-9.0.25-2.el8_3.elrepo.x86_64.
> > The cluster consists of two nodes which are providing a ha-mariadb with the help of two drbd devices for the database and the logfiles. The corosync is working over two rings and both machines are virtual kvm-guests.
> >
> > Problem:
> > Node susanne is the active node and lisbon is changing from standby to active, susanna is trying to demote one drbd-device but is failling to. The cluster is working on properly, but the error stays.
> > This is the what happens:
> >
> > Cluster Summary:
> > * Stack: corosync
> > * Current DC: lisbon (version 2.0.4-6.el8_3.1-2deceaa3ae) - partition with quo rum
> > * Last updated: Tue May 11 16:15:54 2021
> > * Last change: Tue May 11 16:15:42 2021 by root via cibadmin on susanne
> > * 2 nodes configured
> > * 11 resource instances configured
> >
> > Node List:
> > * Online: [ lisbon susanne ]
> >
> > Active Resources:
> > * HA_IP (ocf::heartbeat:IPaddr2): Started susanne
> > * Clone Set: database_drbd-clone [database_drbd] (promotable):
> > * Masters: [ susanne ]
> > * Slaves: [ lisbon ]
> > * Clone Set: drbd_logsfiles-clone [drbd_logsfiles] (promotable):
> > * drbd_logsfiles (ocf::linbit:drbd): Demoting susanne
> > * fs_logfiles (ocf::heartbeat:Filesystem): Started susanne
>
> Presumably fs_logfiles is located on drbd_logfiles, so how comes it is
> active while drbd_logfiles is being demoted? Then drbdadm fails to
> change status to secondary and RA simply loops forever until timeout.
>
> > * fs_database (ocf::heartbeat:Filesystem): Started susanne
> > * mysql-server (ocf::heartbeat:mysql): Started susanne
> > * Clone Set: ping_fw-clone [ping_fw]:
> > * Started: [ lisbon susanne ]
> >
> > -------------------------------------------------------------------------------------------
> > after a few seconds it switches over:
> >
> > Cluster Summary:
> > * Stack: corosync
> > * Current DC: lisbon (version 2.0.4-6.el8_3.1-2deceaa3ae) - partition with quo rum
> > * Last updated: Tue May 11 16:17:59 2021
> > * Last change: Tue May 11 16:15:42 2021 by root via cibadmin on susanne
> > * 2 nodes configured
> > * 11 resource instances configured
> >
> > Node List:
> > * Online: [ lisbon susanne ]
> >
> > Active Resources:
> > * HA_IP (ocf::heartbeat:IPaddr2): Started susanne
> > * Clone Set: database_drbd-clone [database_drbd] (promotable):
> > * Masters: [ susanne ]
> > * Slaves: [ lisbon ]
> > * Clone Set: drbd_logsfiles-clone [drbd_logsfiles] (promotable):
> > * Masters: [ susanne ]
> > * Slaves: [ lisbon ]
> > * fs_logfiles (ocf::heartbeat:Filesystem): Started susanne
> > * fs_database (ocf::heartbeat:Filesystem): Started susanne
> > * mysql-server (ocf::heartbeat:mysql): Started susanne
> > * Resource Group: apache:
> > * httpd_srv (ocf::heartbeat:apache): Started susanne
> > * Clone Set: ping_fw-clone [ping_fw]:
> > * Started: [ lisbon susanne ]
> >
> > Failed Resource Actions:
> > * drbd_logsfiles_demote_0 on susanne 'error' (1): call=736, status='Timed Out'
> > , exitreason='', last-rc-change='2021-05-11 16:15:42 +02:00', queued=0ms, exec=9 0001ms
> > ----------------------------------------------------------------------------------------------
> >
>
> And what you see in logs?
>
> > I think it is a constraint-problem, but I can't find it.
> > This is my config:
> > [root at susanne pacemaker]# pcs config show Cluster Name: mysql_cluster Corosync Nodes:
> > susanne lisbon
> > Pacemaker Nodes:
> > lisbon susanne
> >
> > Resources:
> > Resource: HA_IP (class=ocf provider=heartbeat type=IPaddr2)
> > Attributes: cidr_netmask=24 ip=192.168.18.154
> > Operations: monitor interval=15s (HA_IP-monitor-interval-15s)
> > start interval=0s timeout=20s (HA_IP-start-interval-0s)
> > stop interval=0s timeout=20s (HA_IP-stop-interval-0s)
> > Clone: database_drbd-clone
> > Meta Attrs: clone-max=2 clone-node-max=1 notify=true promotable=true promoted-max=1 promoted-node-max=1
> > Resource: database_drbd (class=ocf provider=linbit type=drbd)
> > Attributes: drbd_resource=drbd1
> > Operations: demote interval=0s timeout=90 (database_drbd-demote-interval-0s)
> > monitor interval=20 role=Slave timeout=20 (database_drbd-monitor-interval-20)
> > monitor interval=10 role=Master timeout=20 (database_drbd-monitor-interval-10)
> > notify interval=0s timeout=90 (database_drbd-notify-interval-0s)
> > promote interval=0s timeout=90 (database_drbd-promote-interval-0s)
> > reload interval=0s timeout=30 (database_drbd-reload-interval-0s)
> > start interval=0s timeout=240 (database_drbd-start-interval-0s)
> > stop interval=0s timeout=100 (database_drbd-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)
> > 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)
> > Resource: mysql-server (class=ocf provider=heartbeat type=mysql)
> > Attributes: additional_parameters=--bind-address=0.0.0.0 binary=/usr/bin/mysqld_safe config=/etc/my.cnf datadir=/mnt/clusterfs1/mysql pid=/var/lib/mysql/run/mariadb.pid socket=/var/lib/mysql/mysql.sock
> > Operations: demote interval=0s timeout=120s (mysql-server-demote-interval-0s)
> > monitor interval=20s timeout=30s (mysql-server-monitor-interval-20s)
> > notify interval=0s timeout=90s (mysql-server-notify-interval-0s)
> > promote interval=0s timeout=120s (mysql-server-promote-interval-0s)
> > start interval=0s timeout=60s (mysql-server-start-interval-0s)
> > stop interval=0s timeout=60s (mysql-server-stop-interval-0s)
> > Group: apache
> > Resource: httpd_srv (class=ocf provider=heartbeat type=apache)
> > Attributes: configfile=/etc/httpd/conf/httpd.conf statusurl=http://127.0.0.1/server-status
> > Operations: monitor interval=10s timeout=20s (httpd_srv-monitor-interval-10s)
> > start interval=0s timeout=40s (httpd_srv-start-interval-0s)
> > stop interval=0s timeout=60s (httpd_srv-stop-interval-0s)
> > Clone: ping_fw-clone
> > Resource: ping_fw (class=ocf provider=pacemaker type=ping)
> > Attributes: dampen=10s host_list=192.168.18.1 multiplier=1000
> > Operations: monitor interval=10s timeout=60s (ping_fw-monitor-interval-10s)
> > start interval=0s timeout=60s (ping_fw-start-interval-0s)
> > stop interval=0s timeout=20s (ping_fw-stop-interval-0s)
> >
> > Stonith Devices:
> > Fencing Levels:
> >
> > Location Constraints:
> > Resource: mysql-server
> > Constraint: location-mysql-server
> > Rule: boolean-op=or score=-INFINITY (id:location-mysql-server-rule)
> > Expression: pingd lt 1 (id:location-mysql-server-rule-expr)
> > Expression: not_defined pingd (id:location-mysql-server-rule-expr-1)
> > Ordering Constraints:
> > start mysql-server then start httpd_srv (kind:Mandatory) (id:order-mysql-server-httpd_srv-mandatory)
> > start database_drbd-clone then start drbd_logsfiles-clone (kind:Mandatory) (id:order-database_drbd-clone-drbd_logsfiles-clone-mandatory)
> > start drbd_logsfiles-clone then start fs_database (kind:Mandatory) (id:order-drbd_logsfiles-clone-fs_database-mandatory)
>
> You need order fs_database after promote operation; and as I just found
> pacemaker also does not reverse it correctly and executes fs stop and
> drbd demote concurrently. So you need additional order constraint to
> first stop fs then demote drbd.
>
> > start fs_database then start fs_logfiles (kind:Mandatory) (id:order-fs_database-fs_logfiles-mandatory)
> > start fs_logfiles then start mysql-server (kind:Mandatory) (id:order-fs_logfiles-mysql-server-mandatory)
> > Colocation Constraints:
> > fs_logfiles with drbd_logsfiles-clone (score:INFINITY) (with-rsc-role:Master) (id:colocation-fs_logfiles-drbd_logsfiles-clone-INFINITY)
> > fs_database with database_drbd-clone (score:INFINITY) (with-rsc-role:Master) (id:colocation-fs_database-database_drbd-clone-INFINITY)
> > drbd_logsfiles-clone with database_drbd-clone (score:INFINITY) (rsc-role:Master) (with-rsc-role:Master) (id:colocation-drbd_logsfiles-clone-database_drbd-clone-INFINITY)
> > HA_IP with database_drbd-clone (score:INFINITY) (rsc-role:Started) (with-rsc-role:Master) (id:colocation-HA_IP-database_drbd-clone-INFINITY)
> > mysql-server with fs_database (score:INFINITY) (id:colocation-mysql-server-fs_database-INFINITY)
> > httpd_srv with mysql-server (score:INFINITY) (id:colocation-httpd_srv-mysql-server-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_3.1-2deceaa3ae
> > have-watchdog: false
> > last-lrm-refresh: 1620742514
> > stonith-enabled: FALSE
> >
> > Tags:
> > No tags defined
> >
> > Quorum:
> > Options:
> >
> >
> >
> >
> >
> > Any suggestions are welcome
> >
> > best regards stay safe, take care
> >
> > fatcharly
> >
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>
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