Mistral workflows and schedulers

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• Creates a full backup and incremental backups based on defined rotation policy.
• Allows you to set limits on the number of full and incremental backups.
• Automatically deletes all incremental backups and creates a new full backup when the incremental backup limit is reached.
• Automatically deletes the oldest full backup when the full backup limit is reached.
• To run workflow provide the following arguments:
  • volume_id – ID of the volume to back up.
  • backup_name – Name of the backup.
  • max_full_backups – Maximum number of full backups to keep.
  • max_incremental_backups – Maximum number of incremental backups to keep per full backup.

Running Mistral Workflow Using Horizon

• Log in to the Horizon Dashboard.
• Navigate to Workflows → Workflows.
• Find the workflow you want to run (e.g., cinder_volume_backup_full, cinder_volume_backup_full_incremental, or cinder_volume_backup_rotation).
• In the Actions column, click "Execute" next to the desired workflow.
• In the Parameters field, enter the required arguments.

Running Mistral workflow using CLI

To use the openstack workflow command, you need to install the python-mistralclient library:

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openstack workflow execution create cinder_volume_backup_rotation \
  '{"volume_id":"<volume_id>", "backup_name":"bkp1", "max_full_backups":2, "max_incremental_backups":5}'

Checking Workflow Status in Horizon

• Navigate to Workflows → Workflow Executions.
• The status of the workflow will be displayed under the State column:
  • SUCCESS – Workflow completed successfully.
  • RUNNING – Workflow is still executing.
  • FAILED – Workflow execution failed (check logs for details).
• Click on the workflow execution ID to see detailed information about the execution.

Creating a Cron Trigger in Mistral

You can automate volume backups by setting up a cron trigger in Mistral. Cron triggers allow you to schedule Mistral workflows to run at specific times or intervals using cron expressions.

Creating a Cron Trigger

To create a cron trigger for volume backups using the openstack cron trigger create command:

openstack cron trigger create <trigger_name> cinder_volume_backup_rotation \

  '{"volume_id":"<volume_id>","backup_name":"<backup_name>","max_full_backups":2,"max_incremental_backups":5}' \

  --pattern "0 * * * *"

Explanation:

<trigger_name>

Cron Pattern Format:

The cron pattern follows the format:

* * * * * 
| | | | |
| | | | +---- Day of the week (0-7, Sunday=0 or 7)
| | | +------ Month (1-12)
| | +-------- Day of the month (1-31)
| +---------- Hour (0-23)
+------------ Minute (0-59)

Examples:

Key Notes

• Mistral cron triggers are ideal for automating backups at regular intervals.
• The cron pattern follows standard Linux cron format.
• Ensure that the python-mistralclient package is installed before creating a cron trigger.
• You can manage cron triggers using the openstack cron trigger commands.