Execute on schedule (cron)

OliveTin can execute actions on a schedule, and uses a cron format for configuration.

config.yaml

actions:
  - title: Say hello
    shell: echo "Hello!"
    execOnCron:
      - "@hourly"

  - title: Say goodbye
    shell: echo "Say Goodbye"
    execOnCron:
      - "*/5 * * * *" # Every 5 minutes

This is a fantastic website: https://cron.help/

Support for seconds in cron

The default cron format for OliveTin supports the Unix/Linux format - 5 fields, with no support for seconds. This is by far the most popular format that most people are used to.

If you need per-second resolution for your actions, this can be enabled in your config - meaning that your cronlines will support 6 columns. The first "new" column is seconds. For example, to execute date every 5 seconds;

config.yaml

cronSupportForSeconds: true

actions:
  title: Execute every 5 seconds
  shell: date
  execOnCron:
    - "*/5 * * * * *"

Cron and ACLs

If you have enabled ACL, cron tasks are run as the user cron, which means that your ACL needs to allow the cron user to execute the action. This is one possibilty:

config.yaml

accessControlLists:
  - name: "cron"
    matchUsernames:
      - cron
    permissions:
      exec: true
actions:
  - title: Say hello
    shell: echo "Hello!"
    execOnCron:
      - "@hourly"
    acls:
        - "cron"