[ClusterLabs] 2 node mariadb-cluster - constraint-problems ?
Andrei Borzenkov
arvidjaar at gmail.com
Tue May 11 11:19:21 EDT 2021
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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