Re: [SLE] cron.daily

From: Ken Schneider (suse-list_at_bout-tyme.net)
Date: 03/05/05

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    To: SLE <suse-linux-e@suse.com>
Date: Fri, 04 Mar 2005 23:22:14 -0500

    On Fri, 2005-03-04 at 21:26, Carlos E. R. wrote:
    > The Friday 2005-03-04 at 13:46 +0100, Anders Johansson wrote:
    >
    > > On Friday 04 March 2005 13:33, Richard Bos wrote:
    > > > Does anyone know when the scripts in /etc/cron.daily are being executed?
    > > > It is of course once a day, but just when. Are the scripts examined every
    > > > minuted by /usr/bin/cron? If so does it mean that the scripts
    > > > in /etc/cron.daily could be executed just after booting? Just wondering.
    > >
    > > Have a look at /etc/crontab, that's where it's run from.
    > ...
    > > so it gets run at 4.15 in the morning
    >
    > Actually, it is a bit more complex than that :-)
    >
    > The first line found in crontab is:
    >
    > -*/15 * * * * root test -x /usr/lib/cron/run-crons && /usr/lib/cron/run-crons >/dev/null 2>&1
    >
    > The main script gets run every 15 minutes. Then, it does some math to see

    NO math is performed, cron runs when instructed.

    > when each section (hourly, daily, etc) was run - and if the proper
    > interval has passed, all the scripts in the corresponding directory are
    > executed.
    >
    >
    > 59 * * * * root rm -f /var/spool/cron/lastrun/cron.hourly
    > 14 4 * * * root rm -f /var/spool/cron/lastrun/cron.daily
    > 29 4 * * 6 root rm -f /var/spool/cron/lastrun/cron.weekly
    > 44 4 1 * * root rm -f /var/spool/cron/lastrun/cron.monthly
    >
    > This ensures that each flag file is deleted, if the machine is running at
    > that time. For example, the hourly flag is deleted at the 59th minute of
    > each hour; the daily at 4:14, the weekly at 4:29, the monthly at 4:44...
    >
    > Those will be the hours they run, I think, if the machine is on
    > continuously - well, when the next 15 minutes interval completes, I think.
    >
    > If the machine is not on 24*7, the run-crons script runs 15 minutes after
    > booting.

    Wrong. It runs every 15 minutes starting at the top of the hour. If you
    boot your machine at 8:10 run-crons will still run at 8:15 -not- at
    8:25, 15 minutes after you booted.

    > The daily section will run then if it hasn't run in the previous
    > 24 hours,

    Incorrect it will -only- run at 4:15am if the machine is on. The only
    way it will run at some other time is if you shut the machine down after
    4:14am, when the daily check file has been deleted and before the 4:15am
    run of run-crons.

    > and then again sometime after 4:14 if it still on ... or
    > something of the sort, I'm to sleepy to think. I'm off! O:-)
    >
    > --
    > Cheers,
    > Carlos Robinson 

    -- 
Ken Schneider
UNIX  since 1989, linux since 1994, SuSE  since 1998
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