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10.6. Scheduling Geo-replication as a Cron Job

Cron is a daemon that can be used to schedule the execution of recurring tasks according to a combination of the time, day of the month, month, day of the week, and week. Cron assumes that the system is ON continuously. If the system is not ON when a task is scheduled, it is not executed. A script is provided to run geo-replication only when required or to schedule geo-replication to run during low I/O.
For more information on installing Cron and configuring Cron jobs, see https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html-single/System_Administrators_Guide/index.html#ch-Automating_System_Tasks
The script provided to schedule the geo-replication session, performs the following:
  1. Stops the geo-replication session, if started
  2. Starts the geo-replication session
  3. Sets the Checkpoint
  4. Checks the status of checkpoint until it is complete
  5. After the checkpoint is complete, stops the geo-replication session
Run geo-replication Session

To run a geo-reolication session only when required, run the following script: 

# python /usr/share/glusterfs/scripts/schedule_georep.py MASTERVOL SLAVEHOST SLAVEVOL
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For example, 
# python /usr/share/glusterfs/scripts/schedule_georep.py Volume1 example.com slave-vol
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Run the following command to view the help: 
# python /usr/share/glusterfs/scripts/schedule_georep.py --help
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Schedule a Cron Job

To schedule geo-replication to run automatically using Cron: 

minute hour day month day-of-week directory_and_script-to-execute MASTERVOL SLAVEHOST SLAVEVOL >> log_file_for_script_output
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For example, to run geo-replication daily at 20:30 hours, run the following: 
30 20 * * * root python /usr/share/glusterfs/scripts/schedule_georep.py --no-color Volume1 example.com slave-vol >> /var/log/glusterfs/schedule_georep.log 2>&1
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