Cron.weekly

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If I have multiple files in cron.weekly and one script takes hours to finish. Will it block other scripts in cron.weekly?

4 thoughts on - Cron.weekly

  • I doubt it, based on the results of this crontab on EL7:

    51 13 * * * echo start 1 ; sleep 2m ; echo end 1
    51 13 * * * echo start 2 ; sleep 2m ; echo end 2

    At 13:51, nothing appeared in my mail file. Two minutes later, two different messages appeared, each with the expected “echo” outputs. Thus, they must have run in parallel.

  • Yes. They’re run from “anacron -s” by default. If you need a job to run in parallel, configure it into /etc/cron.d at an adecuate time on sundays (as you surely know, you can’t use the script directly in cron.d).

  • Those are two distinct cron jobs. The scripts in /etc/cron.weekly are all run by the same cron job in /etc/crontab.

    47 6 * * 7 root test -x /usr/sbin/anacron || ( cd / && run-parts –report /etc/cron.weekly )

    I believe that run-parts runs each script in serial, and therefore a long-running weekly script will block.

    If you don’t care when you get the output, and have only one long-running script, you can rename it so that it runs last. Otherwise, you’d need to put the long-running job into its own cron entry.

    –keith

  • Matt,

    Keith answer applies to CentOS 5 and 6, mine to CentOS 7. In any case, scripts will exec one at a time in alphabetical order.

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