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8.12. Scheduling of Snapshots
8.12.1. Prerequisites
- To initialize snapshot scheduler on all the nodes of the cluster, execute the following command:
snap_scheduler.py init
This command initializes the snap_scheduler and interfaces it with the crond running on the local node. This is the first step, before executing any scheduling related commands from a node.Note
This command has to be run on all the nodes participating in the scheduling. Other options can be run independently from any node, where initialization has been successfully completed. - A shared storage named
gluster_shared_storage
is used across nodes to co-ordinate the scheduling operations. This shared storage is mounted at /var/run/gluster/shared_storage on all the nodes. For more information see, Section 11.12, “Setting up Shared Storage Volume” - All nodes in the cluster have their times synced using NTP or any other mechanism. This is a hard requirement for this feature to work.
- If you are on Red Hat Enterprise Linux 7.1 or later, set the
cron_system_cronjob_use_shares
boolean toon
by running the following command:# setsebool -P cron_system_cronjob_use_shares on
8.12.2. Snapshot Scheduler Options
Note
To enable snap scheduler, execute the following command:
snap_scheduler.py enable
Note
# snap_scheduler.py enable snap_scheduler: Snapshot scheduling is enabled
To enable snap scheduler, execute the following command:
snap_scheduler.py disable
# snap_scheduler.py disable snap_scheduler: Snapshot scheduling is disabled
To display the the current status(Enabled/Disabled) of the snap scheduler, execute the following command:
snap_scheduler.py status
# snap_scheduler.py status snap_scheduler: Snapshot scheduling status: Disabled
To add a snapshot schedule, execute the following command:
snap_scheduler.py add "Job Name" "Schedule" "Volume Name"
Example of job definition: .---------------- minute (0 - 59) | .------------- hour (0 - 23) | | .---------- day of month (1 - 31) | | | .------- month (1 - 12) OR jan,feb,mar,apr ... | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat | | | | | * * * * * user-name command to be executed
# snap_scheduler.py add "Job1" "* * * * *" test_vol snap_scheduler: Successfully added snapshot schedule
Note
Scheduled-Job1-test_vol_GMT-2015.06.19-09.47.01
To edit an existing snapshot schedule, execute the following command:
snap_scheduler.py edit "Job Name" "Schedule" "Volume Name"
Example of job definition: .---------------- minute (0 - 59) | .------------- hour (0 - 23) | | .---------- day of month (1 - 31) | | | .------- month (1 - 12) OR jan,feb,mar,apr ... | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat | | | | | * * * * * user-name command to be executed
# snap_scheduler.py edit "Job1" "*/5 * * * *" gluster_shared_storage snap_scheduler: Successfully edited snapshot schedule
To list the existing snapshot schedule, execute the following command:
snap_scheduler.py list
# snap_scheduler.py list JOB_NAME SCHEDULE OPERATION VOLUME NAME -------------------------------------------------------------------- Job0 * * * * * Snapshot Create test_vol
To delete an existing snapshot schedule, execute the following command:
snap_scheduler.py delete "Job Name"
# snap_scheduler.py delete Job1 snap_scheduler: Successfully deleted snapshot schedule