Scheduled tasks (cron) - Revision history

Haars0011: IA migration §8: rewrite around scrontab (SLURM cron); discourage login-node crontab; fix crontab -l/-e bug (via update-page on MediaWiki MCP Server)

2026-06-18T12:58:14Z

IA migration §8: rewrite around scrontab (SLURM cron); discourage login-node crontab; fix crontab -l/-e bug (via update-page on MediaWiki MCP Server)

@@ Line 1: / Line 1: @@
-== Using crontab ==
+{{Warning|Do not use a plain login-node <code>crontab</code> for recurring work. Anything scheduled with <code>crontab</code> runs on the login node, which is a shared access point not meant for computation, and the crontab is wiped when the login node reboots. Use <code>scrontab</code> instead.}}
-With crontab you can run jobs on a fixed time schedule.
+== Using scrontab ==
-To start an edit use '''crontab -l''' , the info on how that file should look can be found by using '''man 5 crontab'''.
+Edit your scrontab with:
-Be aware of the following :
+<syntaxhighlight lang="bash">
-The scripts will run on the login node, so do not use a lot of resources.
+Each entry has two parts: one or more <code>#SCRON</code> lines that set the SLURM options for the job (partition, time limit, resources, job name, …), followed by a normal crontab time specification and the command to run.
-The crontab entry will be wiped upon reboot !

Haars0011: Haars0011 moved page Running scripts on a fixed timeschedule (cron) to Scheduled tasks (cron): IA migration §8: rename Running scripts on a fixed timeschedule (cron) → Scheduled tasks (cron) (leaving redirect) (via move-page on MediaWiki MCP Server)

2026-06-18T12:58:04Z

Haars0011 moved page Running scripts on a fixed timeschedule (cron) to Scheduled tasks (cron): IA migration §8: rename Running scripts on a fixed timeschedule (cron) → Scheduled tasks (cron) (leaving redirect) (via move-page on MediaWiki MCP Server)

← Older revision	Revision as of 12:58, 18 June 2026
(No difference)

Haars001 at 13:24, 20 October 2020

2020-10-20T13:24:09Z

← Older revision		Revision as of 13:24, 20 October 2020
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	This means that you can e.g. download some data every day.		This means that you can e.g. download some data every day.

	To start an edit ~~with~~ '''crontab -l''' , the info on that file can be found by using '''man 5 crontab'''.		To start an edit use '''crontab -l''' , the info on how that file should look can be found by using '''man 5 crontab'''.

	Be aware of the following :		Be aware of the following :

	The scripts will run on the login node, so do not use a lot of resources		The scripts will run on the login node, so do not use a lot of resources.
	The crontab entry will be wiped upon reboot~~, so if you want to make sure that it is there, it wise to set that up.~~		The crontab entry will be wiped upon reboot !

Haars001 at 13:21, 20 October 2020

2020-10-20T13:21:49Z

← Older revision		Revision as of 13:21, 20 October 2020
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	== Using crontab ==		== Using crontab ==

	With crontab you can run jobs on a fixed ~~timeschedule~~.		With crontab you can run jobs on a fixed time schedule.

	This means that you can e.g. download some data every day.		This means that you can e.g. download some data every day.

Haars001: Created page with " == Using crontab == With crontab you can run jobs on a fixed timeschedule. This means that you can e.g. download some data every day. To start an edit with '''crontab -l'..."

2020-10-20T13:21:20Z

Created page with " == Using crontab == With crontab you can run jobs on a fixed timeschedule. This means that you can e.g. download some data every day. To start an edit with '''crontab -l'..."

New page

== Using crontab ==

With crontab you can run jobs on a fixed timeschedule.

This means that you can e.g. download some data every day.

To start an edit with '''crontab -l''' , the info on that file can be found by using '''man 5 crontab'''.

Be aware of the following :

The scripts will run on the login node, so do not use a lot of resources
The crontab entry will be wiped upon reboot, so if you want to make sure that it is there, it wise to set that up.