Configuring the CRON job

The following parameters are available in the LANCOM for configuring CRON jobs:

LANconfig: Date & time / General / CRON table

WEBconfig: LCOS menu tree / Setup / Config / CRON table

• Entry active Activates or deactivates the entry.
  • Default: Active
• Time base The 'Time base' field determines whether time control is based on real time or on the device's operating time.
  • Real time: These rules evaluate all time/date information.
  • Operation time: These rules only evaluate the minutes and hours since the last time the device was started.
  • Default: Real time
• Minutes
• Hours
• Week days
• Month days
• Months The values 'minutes' to 'months' define the times when a command is to be executed. With no value entered, it is not included in the controlling. For each parameter, a comma-separated list of values can be entered, or alternatively a range of minimum and maximum values. The syntax of the 'Week day' field corresponds with the usual CRON interpretation:
  • 0: Sunday
  • 1: Monday
  • 2: Tuesday
  • 3: Wednesday
  • 4: Thursday
  • 5: Friday
  • 6: Saturday
• Command The command to be executed or a comma-separated list of commands. Any LANCOM command-line function can be executed.
• Owner An administrator defined in the device can be designated as owner of the CRON job. If an owner is defined, then the CRON job commands will be executed with the rights of the owner.
  • Default: root
• Variation This parameter specifies the maximum delay in minutes for the start of the CRON job after the set start time. The actual delay time is determined randomly and lies between 0 and the time entered here.
  • Default: 0
  • Values: 0 to 65535 seconds.
  • Particular values: With the variation set to zero the CRON job will be executed at the set time.
  Note: Real-time based rules can only be executed if the device has a time from a relevant source, e.g. via NTP.

Examples:

• The first entry cuts the connection to the internet provider every morning at 4 am (forced disconnection).
• The second entry sends an information mail every morning at 3:59 am (directly before the forced disconnection) to the admin.
• The third entry deletes on the first of every month the accounting table.
• The fourth entry builds up a connection to the headquarter every week day at 6 pm.