Pacemaker Corosync
Восстановление Galera запущенной под PCS
Это заметка о том как восстанавливать разваленный кластер, что бы не потерять если еще раз понадобится.
На любом контроллере (в этом вом вопросе все контроллеры равнозначны):
pcs resource disable clone_p_mysqld
Дождаться пока все процессы mysqld будут остановлены
Убедиться что ресурс clone_p_mysql остановлен на всех контроллерах:
pcs status resources
На всех контроллерах зачистить (перенести или удалить) данные mysql:
mv /var/lib/mysql/* /tmp/mysql/
Выбрать один контроллер как основной для восстановления (это может быть любой контроллер), далее называем его
controller-x
Восстановить бекап (это конечно хорошо, если он есть) на controller-x:
cp -R /ext-volume/mysql-backup/* /var/lib/mysql/
Поправить права на controller-x:
chown -R mysql:mysql /var/lib/mysql
Для OCF скриптов нужны переменные окружения, их нужно установить перед запуском скрипта mysql-wss
,
После чего стартовать базу на выбранном контроллере controller-x.
Обратить внимание что первый (и только первый) контроллер запускается с параметром --wsrep-new-cluster
export OCF_RESOURCE_INSTANCE=p_mysqld export OCF_ROOT=/usr/lib/ocf export OCF_RESKEY_socket=/var/run/mysqld/mysqld.sock export OCF_RESKEY_master_timeout=10 export OCF_RESKEY_test_passwd=`crm_resource -r p_mysqld -g test_passwd` export OCF_RESKEY_test_user=`crm_resource -r p_mysqld -g test_user` export OCF_RESKEY_additional_parameters="--wsrep-new-cluster" /usr/lib/ocf/resource.d/fuel/mysql-wss start
Execute monitor operation on controller-x to update Galera GTID in Pacemaker cluster configuration:
/usr/lib/ocf/resource.d/fuel/mysql-wss monitor
Export variables for mysql-wss and start mysqld on all other controllers:
export OCF_RESOURCE_INSTANCE=p_mysqld export OCF_ROOT=/usr/lib/ocf export OCF_RESKEY_socket=/var/run/mysqld/mysqld.sock export OCF_RESKEY_master_timeout=10 export OCF_RESKEY_test_passwd=`crm_resource -r p_mysqld -g test_passwd` export OCF_RESKEY_test_user=`crm_resource -r p_mysqld -g test_user` /usr/lib/ocf/resource.d/fuel/mysql-wss start
From any controller in the cluster, enable MySQL resource in Pacemaker by running the following command:
pcs resource enable clone_p_mysqld
Verify that clone set clone_p_mysqld is running on all controllers:
pcs status resources
https://clusterlabs.org/pacemaker/doc/2.1/Pacemaker_Explained/html/nodes.html#tracking-node-health
2
All Controller services go down due to a full partition issue. Horizon Web Interface is down Cluster Public IP is unreachable Floating IPs are unreachable A "health_disk" red value change is traceable on the affected Controller /var/log/pacemaker.log file due to a filled partition.
- grep 'health_disk.*value="red"' /var/log/pacemaker.log
May 10 02:53:21 [9160] node-X.default.ltd cib: info: cib_perform_op: ++ /cib/status/node_state[@id='X']/transient_attributes[@id='X']/instance_attributes[@id='status-X']: <nvpair id="status-X-#health_disk" name="#health_disk" value="red"/> After the health disk change you will see a health strategy: "migrate-on-red" May 10 02:53:21 [9164] node-X.default.ltd pengine: info: apply_system_health: Applying automated node health strategy: migrate-on-red On a Cluster of only one Controller; all services leave the node and can't find a suitable node May 10 02:53:51 [9164] node-X.default.ltd pengine: info: determine_online_status: Node node-X.default.ltd is online May 10 02:53:51 [9164] node-X.default.ltd pengine: info: determine_op_status: Operation monitor found resource p_vrouter:0 active on node-X.default.ltd May 10 02:53:51 [9164] node-X.default.ltd pengine: info: apply_system_health: Applying automated node health strategy: migrate-on-red May 10 02:53:51 [9164] node-X.default.ltd pengine: info: apply_system_health: Node node-X.default.ltd has an combined system health of -1000000 May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_print: sysinfo_node-X.default.ltd (ocf::pacemaker:SysInfo): Stopped May 10 02:53:51 [9164] node-X.default.ltd pengine: info: clone_print: Clone Set: clone_p_vrouter [p_vrouter] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: short_print: Stopped: [ node-X.default.ltd ] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_print: vip__management (ocf::fuel:ns_IPaddr2): Stopped May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_print: vip__vrouter_pub (ocf::fuel:ns_IPaddr2): Stopped May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_print: vip__vrouter (ocf::fuel:ns_IPaddr2): Stopped May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_print: vip__public (ocf::fuel:ns_IPaddr2): Stopped May 10 02:53:51 [9164] node-X.default.ltd pengine: info: clone_print: Clone Set: clone_p_haproxy [p_haproxy] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: short_print: Stopped: [ node-X.default.ltd ] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: clone_print: Clone Set: clone_p_mysql [p_mysql] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: short_print: Stopped: [ node-X.default.ltd ] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: clone_print: Master/Slave Set: master_p_rabbitmq-server [p_rabbitmq-server] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: short_print: Stopped: [ node-X.default.ltd ] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: clone_print: Clone Set: clone_p_dns [p_dns] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: short_print: Stopped: [ node-X.default.ltd ] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: clone_print: Master/Slave Set: master_p_conntrackd [p_conntrackd] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: short_print: Stopped: [ node-X.default.ltd ] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: clone_print: Clone Set: clone_p_heat-engine [p_heat-engine] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: short_print: Stopped: [ node-X.default.ltd ] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: clone_print: Clone Set: clone_p_neutron-plugin-openvswitch-agent [p_neutron-plugin-openvswitch-agent] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: short_print: Stopped: [ node-X.default.ltd ] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: clone_print: Clone Set: clone_p_neutron-l3-agent [p_neutron-l3-agent] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: short_print: Stopped: [ node-X.default.ltd ] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: clone_print: Clone Set: clone_p_neutron-dhcp-agent [p_neutron-dhcp-agent] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: short_print: Stopped: [ node-X.default.ltd ] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: clone_print: Clone Set: clone_p_neutron-metadata-agent [p_neutron-metadata-agent] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: short_print: Stopped: [ node-X.default.ltd ] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: clone_print: Clone Set: clone_ping_vip__public [ping_vip__public] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: short_print: Stopped: [ node-X.default.ltd ] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: clone_print: Clone Set: clone_p_ntp [p_ntp] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: short_print: Stopped: [ node-X.default.ltd ] May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource sysinfo_node-X.default.ltd cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: rsc_merge_weights: clone_p_vrouter: Rolling back scores from clone_p_dns May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource p_vrouter:0 cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: rsc_merge_weights: clone_p_haproxy: Rolling back scores from vip__management May 10 02:53:51 [9164] node-X.default.ltd pengine: info: rsc_merge_weights: clone_p_haproxy: Rolling back scores from vip__public May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource p_haproxy:0 cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource vip__management cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: rsc_merge_weights: vip__vrouter_pub: Rolling back scores from master_p_conntrackd May 10 02:53:51 [9164] node-X.default.ltd pengine: info: rsc_merge_weights: vip__vrouter_pub: Rolling back scores from vip__vrouter May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource vip__vrouter_pub cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource vip__vrouter cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource vip__public cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource p_mysql:0 cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource p_rabbitmq-server:0 cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: master_color: master_p_rabbitmq-server: Promoted 0 instances of a possible 1 to master May 10 02:53:51 [9164] node-X.default.ltd pengine: notice: clone_rsc_colocation_rh: Cannot pair p_dns:0 with instance of clone_p_vrouter May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource p_dns:0 cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: p_conntrackd:0: Rolling back scores from vip__vrouter_pub May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource p_conntrackd:0 cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: master_color: master_p_conntrackd: Promoted 0 instances of a possible 1 to master May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource p_heat-engine:0 cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource p_neutron-plugin-openvswitch-agent:0 cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource p_neutron-l3-agent:0 cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource p_neutron-dhcp-agent:0 cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource p_neutron-metadata-agent:0 cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource ping_vip__public:0 cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: native_color: Resource p_ntp:0 cannot run anywhere May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave sysinfo_node-X.default.ltd (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave p_vrouter:0 (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave vip__management (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave vip__vrouter_pub (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave vip__vrouter (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave vip__public (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave p_haproxy:0 (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave p_mysql:0 (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave p_rabbitmq-server:0 (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave p_dns:0 (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave p_conntrackd:0 (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave p_heat-engine:0 (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave p_neutron-plugin-openvswitch-agent:0 (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave p_neutron-l3-agent:0 (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave p_neutron-dhcp-agent:0 (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave p_neutron-metadata-agent:0 (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave ping_vip__public:0 (Stopped) May 10 02:53:51 [9164] node-X.default.ltd pengine: info: LogActions: Leave p_ntp:0 (Stopped) EnvironmentThe characteristics of the issue that are not part of the problem (Product/s, Release, Version/s, Operating System, Component/s) Mirantis OpenStack 8.0, 9.2 Pacemaker HA Mode cluster with only 1 Controller ResolutionNumbered series of steps about how to fix the issue Determine the which of the partitions is full
- df -h / /var/log /var/lib/mysql
Clean up the partition that is full. Full partitions can have different causes, but the partitions that are most likely to get full are: /var/log and /var/lib/mysql /var/log - How to Clean up a full /var/log/ partition in a Controller on Mirantis OpenStack 8.0 /var/lib/mysql - How to purge MySQL binary logs to recover space on MySQL partition. Stop and Start Pacemaker
- service pacemaker stop
- service pacemaker start
CauseWhy the issue occurred – if known Mirantis OpenStack 8.0 utilizes a Pacemaker/Corosync feature not previously used in Mirantis OpenStack; the node-health-strategy=migrate-on-red is now setup by default.
- crm configure show cib-bootstrap-options
property cib-bootstrap-options: \ dc-version=1.1.12-561c4cf \ cluster-infrastructure=corosync \ no-quorum-policy=stop \ cluster-recheck-interval=190s \ stonith-enabled=false \ start-failure-is-fatal=false \ symmetric-cluster=false \ last-lrm-refresh=1461091450 \ node-health-strategy=migrate-on-red There are new Pacemaker/Corosync primitives that will monitor the node health; each Controller node should have a sysinfo_node-x primitive.
- crm configure show sysinfo_*
primitive sysinfo_node-1.default.tld ocf:pacemaker:SysInfo \ op monitor interval=15s \ params disks="/ /var/log /var/lib/mysql" min_disk_free=512M disk_unit=M There are 3 monitored partitions: / /var/log /var/lib/mysql The node health will change to red if the the minimum disk space of 512 MB is reached in any of the above partitions; triggering the node services to be evacuated to another node. The main issue in a Cluster of 1 node is that once the services are migrated, there is no additional node to evacuated the services to.
SHOW GLOBAL STATUS LIKE 'wsrep_%';
3
Validated External ProblemSymptoms of the problem being solved, objectives of the procedure or additional details about the question being asked that summarize what the customer is experiencing. MySQL is not running on one of the controller nodes
- pcs status
Clone Set: clone_p_mysql [p_mysql]
Started: [ b05-39-controller.domain.tld b06-39-controller.domain.tld ] Stopped: [ b05-38-controller.domain.tld ]
EnvironmentThe characteristics of the issue that are not part of the problem (Product/s, Release, Version/s, Operating System, Component/s) Mirantis OpenStack 7.0 and higher MySQL Pacemaker Galera ResolutionNumbered series of steps about how to fix the issue Make sure MySQL is stopped on problematic node
- ps -ef | grep mysql
root 14878 5566 0 14:33 pts/0 00:00:00 grep --color=auto mysql Edit the default timeout for start operation
- crm configure edit p_mysql
Note: for Mirantis OpenStack 9.0 and higher, run the following command:
- crm configure edit p_mysqld
Set the temporary timeout value for p_mysql-start-0 to be 1200
- pcs resource show p_mysql
Resource: p_mysql (class=ocf provider=fuel type=mysql-wss)
Attributes: test_user=wsrep_sst test_passwd=??? socket=/var/run/mysqld/mysqld.sock
Operations: monitor interval=60 timeout=55 (p_mysql-monitor-60)
start interval=0 timeout=1200 (p_mysql-start-0)
stop interval=0 timeout=120 (p_mysql-stop-0)
Cleanup the p_mysql resource
- crm resource cleanup p_mysql
Wait for 15-20 minutes for synchronization to be completed Run pcs status again to check mysql is back up and running on the problematic controller node
- pcs status
Clone Set: clone_p_mysql [p_mysql]
Started: [ b05-38-controller.domain.tld b05-39-controller.domain.tld b06-39-controller.domain.tld ]
Ensure that the cluster is synced again | wsrep_local_state_comment | Synced | | wsrep_cert_index_size | 899 | | wsrep_causal_reads | 0 | | wsrep_incoming_addresses | 10.128.0.133:3307,10.128.0.132:3307,10.128.0.134:3307
8. Reset the timeout value for p_mysql-start-0 to default value.
4
The most frequently used CRM commands
Action Command Example Show cluster status crm status crm status Show status of resource crm resource status crm resource status Cleanup resource status crm resource cleanup <resource> crm resource cleanup p_neutron-dhcp-agent Start a resource crm resource start <resource> crm resource start p_neutron-dhcp-agent Stop a resource crm resource stop <resource> crm resource stop p_neutron-dhcp-agent Restart a resource crm resource restart <resource> crm resource restart p_neutron-dhcp-agent Put a resource into manage mode crm resource manage <resource> crm resource manage p_neutron-dhcp-agent Put a resource into unmanage mode crm resource unmanage <resource> crm resource unmanage p_neutron-dhcp-agent Migrate a resource to another node crm resource migrate <resource> [<node>] [<lifetime>] [force] crm resource migrate p_neutron-dhcp-agent
The frequently used PCS commands Action Command Example Show cluster status pcs status pcs status Show status of resource pcs status resources pcs status resources Cleanup resource status pcs resource cleanup resource_id pcs resource cleanup p_neutron-plugin-openvswitch-agent Put a resource into manage mode pcs manage <resource id> ... [resource n] Put a resource into unmanage mode pcs unmanage <resource id> ... [resource n] Saves the raw xml from the CIB into a file pcs cluster cib pcs cluster cib Display full cluster config pcs config pcs config Stopping Cluster Services Force stop pcs cluster stop [--all] [node] [...] pcs cluster kill pcs cluster stop node-1 Standby Mode The specified node is no longer able to host resources pcs cluster standby node | --all pcs cluster unstandby node | --all pcs cluster standby node-1 pcs cluster unstandby node-1 Enabling Cluster Resources pcs resource enable resource_id [--wait[=n]] pcs resource enable p_neutron-l3-agent Disabling Cluster Resources pcs resource disable resource_id [--wait[=n]] pcs resource disable p_neutron-l3-agent Prevent the resource id specified from running on the node pcs resource ban <resource id> [node] [--master] pcs resource ban p_neutron-plugin-openvswitch-agent node-1 Remove constraints created by move and/or ban on the specified resource pcs resource clear <resource id> [node] [--master] pcs resource clear p_neutron-plugin-openvswitch-agent node-1 Maintenance Mode tells the cluster to go to a "hands off" mode pcs property set maintenance-mode=[true|false] pcs property set maintenance-mode=true pcs property set maintenance-mode=false Move resource off current node (and optionally onto destination node) pcs move <resource id> [destination node] [--master] pcs resource move p_neutron-dhcp-agent node-1 Force the specified resource to start on this node ignoring the cluster recommendations and print the output from starting the resource pcs debug-start <resource id> [--full] pcs resource debug-start p_ceilometer-agent-central Show options specific resource pcs resource show <resource id> pcs resource show p_neutron-l3-agent Show current failcount for specified resource pcs failcount show <resource id> [node] pcs resource failcount show p_neutron-l3-agent Restart metadata-agent on a specific node pcs resource ban p_neutron-metadata-agent node-1.domain.tld pcs resource clear p_neutron-metadata-agent node-1.domain.tld
5
Cloud restoration how-to
This is brief document like step-by-step how to for restoration MOS–7.0 in case 2 of 3 controllers are down (hardware malfunction, power outage, etc). There is no quorum on pacemaker. Cloud is down. current state: 1 controller up or 1 controller healthy. 2 controllers down or not available or not functional Choose 1st controller – better will be controller with MySQL up and running. But on most cases, with such failures mysql is down on all nodes. node–1 – alive controller (mysql database should not be corrupted) we will back up this node node–2 – down or malfunction controller node–3 – down or malfunction controller Recover cloud on the one controller
For restoring node–1 as a single controller we need: Fix pacemaker quorum policy Fix MySQL server Fix RabbitMQ service Fix other core services (Neutron, Nova, heat, etc) Pacemaker
Switch node–2 and node–3 to maintenance/unmanage state. just for make sure they will not interrupt restoring process. $ crm node maintenance node-2 $ crm node maintenance node-3 Check: $ pcs cluster cib |grep maint <nvpair id="nodes-1-maintenance" name="maintenance" value="off"/> <nvpair id="nodes-2-maintenance" name="maintenance" value="on"/> <nvpair id="nodes-3-maintenance" name="maintenance" value="on"/> $ pcs status Disable mysql on node–1, if that node is not donor from pacemaker prospective we need manually start it as donor. Also we need disable zabbix (in case it installed). High load on MySQL can caused problem during replication or even break replication process. $ pcs resource disable clone_p_mysql $ pcs resource disable p_zabbix-server $ pcs status Switch no-quorum-policy to ignore. We need that for start all pacemaker’s services without quorum. Usually, this step is restoring RabbitMQ. $ crm configure property no-quorum-policy=ignore $ crm configure show $ pcs cluster cib |grep no-quorum $ pcs status RabbitMQ
Restart rabbitmq messaging service. In some cases it is mandatory, for make sure that service is up, running and operational. Stop p_rabbitmq-server on pacemaker $ crm resource stop p_rabbitmq-server Ensure that rabbitmq down and kill it if necessary. If you are using murano please do not kill murano rabbit: kill only rabbit with line like 'pluginsexpanddir "/var/lib/rabbitmq/mnesia/rabbit@node-1-plugins-expand". $ ps -ef|grep rabbit Start p_rabbitmq-server by pacemaker $ crm resource start p_rabbitmq-server $ pcs status Ensure that rabbitmq running $ rabbitmqctl status $ rabbitmqctl cluster_status MySQL
Ensure that there is no MySQL is running and kill it if necessary. $ ps -ef|grep mysql Start MySQL as donor for galera cluster. $ export OCF_RESOURCE_INSTANCE=p_mysql $ export OCF_ROOT=/usr/lib/ocf $ export OCF_RESKEY_socket=/var/run/mysqld/mysqld.sock $ export OCF_RESKEY_additional_parameters="--wsrep-new-cluster" $ /usr/lib/ocf/resource.d/fuel/mysql-wss start Check mysql in a couple of minutes $ mysql -e "show status like 'wsrep_%';" Create mysql backup just in case (if necessary) $ mkdir /tmp/db-backup; \
innobackupex --no-timestamp --socket=/var/run/mysqld/mysqld.sock /tmp/db-backup; \ innobackupex --use-memory=1G --lock-wait-query-type=all --apply-log --socket=/var/run/mysqld/mysqld.sock /tmp/db-backup
You can specify just some special list of tables, Excluding zabbix. please refer to Percona Partial Backups. For example backup without zabbix we will have: $ mysql -e "SELECT CONCAT(table_schema,'.',table_name) FROM information_schema.tables WHERE table_schema not like 'zabbix'; " > db-tables.txt $ innobackupex --tables-file=db-tables.txt --socket=/var/run/mysqld/mysqld.sock /tmp/db-backup Ceph
We have one controller with ceph monitor. There is no quorum, and ceph is not operational. We need remove 2 other monitors from down controllers. Stop ceph monitor: $ stop ceph-mon-all Dump monitor map: $ mkdir ./ceph-mon-dump $ ceph-mon -i node-1 --extract-monmap ./ceph-mon-dump/monmap $ cp ./ceph-mon-dump/monmap ./ceph-mon-dump/monmap.bak Remove node–2 and node–3 from monitor-map $ monmaptool ./ceph-mon-dump/monmap --rm node-2 $ monmaptool ./ceph-mon-dump/monmap --rm node-3 Inject updated monitor map with one monitor: $ ceph-mon -i node-1 --inject-monmap ./ceph-mon-dump/monmap Starting and checking ceph $ start ceph-mon-all $ ceph -s Restart ceph osd on ceph-osd nodes if necessary Neutron and nova services
Now we have MySQL, RabbitMQ and ceph running. Check and restore pacemaker services on controller, and neutron and nova services on computes. $ pcs status $ . openrc $ nova service-list $ neutron agent-list $ neutron agent-list |grep -i xxx After that cloud should be operational. Node–2 restoration
Now we have: cloud – operational, up and running. node–1 – Single controller. up and running. node–2 – down or malfunction controller. let’s start this node. node–3 – down or malfunction controller Start node–2, if it down. For restoring node 2 we have the same sequence, except rabbitmq: adding second node to the rabbitMQ cluster by pacemaker causes rabbitMQ service interruption for a 1–5 min. Node–2 still unmanageable and marked as “maintenance” in the pacemaker. Restoring MySQL on node–2
ssh to node–2. On node–2: Stop mysql by pacemaker script if running: $ export OCF_RESOURCE_INSTANCE=p_mysql $ export OCF_ROOT=/usr/lib/ocf $ export OCF_RESKEY_socket=/var/run/mysqld/mysqld.sock $ /usr/lib/ocf/resource.d/fuel/mysql-wss stop Ensure that mysql is down and no mysql process exist. This is mandatory. Kill the MySQL process if it still running or stucked. Clean up the MySQL directory and run MySQL by pacemaker. $ rm -R /var/lib/mysql/* $ /usr/lib/ocf/resource.d/fuel/mysql-wss start In a 5 minutes or so replication started. In a some time depends of the data amount and network speed replication completed and mysql started. Check the /var/log/mysqld.log for details. Check mysql cluster status after mysql started as galera cluster member. $ mysql -e "show status like 'wsrep_%';" Return back to node–1. Adding node–2 to pacemaker cluster
Now we need restore pacemaker cluster management for node–2. Please make sure that we will not start rabbitMQ on the node. $ pcs resource ban p_rabbitmq-server node-2 $ crm node ready node-2 $ pcs status Adding node–2 to the ceph map
Stop ceph monitor on node–2 $ ssh node-2 stop ceph-mon-all re-add monitor on node-2 node. $ ceph mon remove node-2 $ ceph mon add node-2 <ip addr of node-2 from management network> $ ceph-deploy --overwrite-conf mon create node-2 Check ceph status $ ceph -s As result you will set two monitors in the ceph cluster. Nova and neutron services.
Check and restore (if necessary) nova and neutron services on node–2
$ nova service-list $ neutron agent-list $ neutron agent-list |grep -i xxx
Node–3 restoration
Now we have: cloud – operational, up and running. node–1 – 1st controller. up and running. node–2 – 2nd controller. up and running. node–3 – down or malfunction controller. Start node–3, if it down. Restoring node–3 is similar to restoting node–2, with the same exception for rabbitmq: adding second node to the rabbitMQ cluster by pacemaker causes rabbitMQ service interruption for a 1–5 min. Node–3 still is unmanageable and marked as “maintenance” in the pacemaker. Perform all steps similar to restore node-2 Restoring quorum policy
Restore quorum policy $ crm configure property no-quorum-policy=stop Check pacemaker config and status $ crm configure show $ pcs cluster cib |grep no-quorum $ pcs status Post-recovering tasks.
This is task assigned to the maintenances because some service interruption expected. Restoring mysql managing by pacemaker
This step is not cause mysql restart. It is safe to do during business time, but we recommend shift this step to the maintenance. $ pcs resource clear p_mysql node-2 $ pcs resource clear p_mysql node-3 $ pcs resource enable clone_p_mysql $ pcs status Starting zabbix monitoring service.
Start zabbix service $ pcs resource enable p_zabbix-server In 2-5 minutes please check zabbix status in the pacemaker dashboard $ pcs status Restoring rabbitmq cluster managing by pacemaker. Service interruption for 1–5 min.
Return to pacemaker managing of rabbitmq $ pcs resource clear p_rabbitmq-server node-2 $ pcs resource clear p_rabbitmq-server node-3 In a 3-5 minutes check rabbitmq cluster status by rabbitmqctl: $ rabbitmqctl cluster_status Check by pacemaker: $ pcs status p_rabbitmq-server Ensure that cluster name is the same on master node from pacemaker prospective.
