Mistral workflows and schedulers
...
| Code Block |
|---|
openstack workflow execution create cinder_volume_backup_rotation \
'{"volume_id":"<volume_id>", "backup_name":"bkp1", "max_full_backups":2, "max_incremental_backups":5}' |
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:
| Code Block |
|---|
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:
| Parameter | Description |
|---|
<trigger_name> | Name of the cron trigger. |
cinder_volume_backup_rotation | Workflow name to execute. |
{"volume_id": ..., "backup_name": ..., ...} | JSON data containing workflow input parameters. |
--pattern "0 * * * *" | Cron pattern defining the schedule. |
Cron Pattern Format:
The cron pattern follows the format:
| Code Block |
|---|
* * * * *
| | | | |
| | | | +---- 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:
| Cron Pattern | Schedule |
|---|
0 * * * * | Every hour |
0 2 * * * | Every day at 2:00 AM |
0 2 * * 1 | Every Monday at 2:00 AM |
*/15 * * * * | Every 15 minutes |
0 0 1 * * | First day of every month at midnight |
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.
