34407477e2
Place hyperlinks only at the beginning of a chapter and where it makes sense, so as not to be distracted by redundant hyperlinks Signed-off-by: Alexander Zeidler <a.zeidler@proxmox.com>
100 lines
4.4 KiB
ReStructuredText
100 lines
4.4 KiB
ReStructuredText
.. _calendar-event-scheduling:
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Calendar Events
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===============
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Introduction and Format
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-----------------------
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Certain tasks, for example pruning and garbage collection, need to be
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performed on a regular basis. `Proxmox Backup`_ Server uses a format inspired
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by the systemd Time and Date Specification (see `systemd.time manpage`_)
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called `calendar events` for its schedules.
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`Calendar events` are expressions to specify one or more points in time.
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They are mostly compatible with systemd's calendar events.
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The general format is as follows:
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.. code-block:: console
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:caption: Calendar event
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[WEEKDAY] [[YEARS-]MONTHS-DAYS] [HOURS:MINUTES[:SECONDS]]
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Note that there either has to be at least a weekday, date or time part.
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If the weekday or date part is omitted, all (week)days are included.
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If the time part is omitted, the time 00:00:00 is implied.
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(e.g. '2020-01-01' refers to '2020-01-01 00:00:00')
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Weekdays are specified with the abbreviated English version:
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`mon, tue, wed, thu, fri, sat, sun`.
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Each field can contain multiple values in the following formats:
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* comma-separated: e.g., 01,02,03
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* as a range: e.g., 01..10
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* as a repetition: e.g, 05/10 (means starting at 5 every 10)
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* and a combination of the above: e.g., 01,05..10,12/02
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* or a `*` for every possible value: e.g., \*:00
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There are some special values that have a specific meaning:
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================================= ==============================
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Value Syntax
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================================= ==============================
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`minutely` `*-*-* *:*:00`
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`hourly` `*-*-* *:00:00`
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`daily` `*-*-* 00:00:00`
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`weekly` `mon *-*-* 00:00:00`
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`monthly` `*-*-01 00:00:00`
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`yearly` or `annually` `*-01-01 00:00:00`
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`quarterly` `*-01,04,07,10-01 00:00:00`
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`semiannually` or `semi-annually` `*-01,07-01 00:00:00`
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================================= ==============================
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Here is a table with some useful examples:
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======================== ============================= ===================================
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Example Alternative Explanation
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======================== ============================= ===================================
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`mon,tue,wed,thu,fri` `mon..fri` Every working day at 00:00
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`sat,sun` `sat..sun` Only on weekends at 00:00
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`mon,wed,fri` -- Monday, Wednesday, Friday at 00:00
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`12:05` -- Every day at 12:05 PM
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`*:00/5` `0/1:0/5` Every five minutes
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`mon..wed *:30/10` `mon,tue,wed *:30/10` Monday, Tuesday, Wednesday 30, 40 and 50 minutes after every full hour
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`mon..fri 8..17,22:0/15` -- Every working day every 15 minutes between 8 AM and 6 PM and between 10 PM and 11 PM
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`fri 12..13:5/20` `fri 12,13:5/20` Friday at 12:05, 12:25, 12:45, 13:05, 13:25 and 13:45
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`12,14,16,18,20,22:5` `12/2:5` Every day starting at 12:05 until 22:05, every 2 hours
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`*:*` `0/1:0/1` Every minute (minimum interval)
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`*-05` -- On the 5th day of every Month
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`Sat *-1..7 15:00` -- First Saturday each Month at 15:00
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`2015-10-21` -- 21st October 2015 at 00:00
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======================== ============================= ===================================
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Differences to systemd
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----------------------
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Not all features of systemd calendar events are implemented:
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* no Unix timestamps (e.g. `@12345`): instead use date and time to specify
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a specific point in time
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* no timezone: all schedules use the timezone of the server
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* no sub-second resolution
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* no reverse day syntax (e.g. 2020-03~01)
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* no repetition of ranges (e.g. 1..10/2)
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Notes on Scheduling
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-------------------
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In Proxmox Backup, scheduling for most tasks is done in the
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`proxmox-backup-proxy`. This daemon checks all job schedules
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every minute, to see if any are due. This means that even though
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`calendar events` can contain seconds, it will only be checked
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once per minute.
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Also, all schedules will be checked against the timezone set
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in the Proxmox Backup Server.
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