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#1 2010-04-22 13:39:58
- jeffmikels
- Member
- Registered: 2007-04-19
- Posts: 37
crond spawns multiple copies of my script
Using:
Linux [FQDN] 2.6.33-ARCH #1 SMP PREEMPT Mon Apr 5 05:57:38 UTC 2010 i686 AMD Sempron(tm) Processor 3000+ AuthenticAMD GNU/Linux
dcron 4.4-2
I have the following script saved as 'backup' in my /etc/cron.daily directory:
#!/bin/bash
BACKUP=/var/scripts/backup2
nice $BACKUP --clean /etc /boot /share /srv/www /home /var/scripts /var/cache/pacman/pkg /var/lib/mysql /optMy backup2 script is a python script that does the following: (1) walks the directories passed to it on the command line. (2) backs up updated files to backup drive (3) maintains an archive of old versions.
The script has been working fine for me for two years and it is still working fine, but after my latest update to dcron, run-cron spawns nine copies of the script simultaneously. Every morning when I check the server, I have these nine processes running:
[jeff@adam log]$ ps aux |grep backup
root 4380 0.0 0.0 4544 412 ? S 03:52 0:00 /bin/bash /etc/cron.daily/backup
root 4381 2.1 0.2 7132 2400 ? DN 03:52 6:37 python /var/scripts/backup2 --clean /etc /boot /share /sr v/www /home /var/scripts /var/cache/pacman/pkg /var/lib/mysql /opt
root 4444 0.0 0.0 4544 412 ? S 04:02 0:00 /bin/bash /etc/cron.daily/backup
root 4445 2.1 0.2 7128 2596 ? DN 04:02 6:25 python /var/scripts/backup2 --clean /etc /boot /share /sr v/www /home /var/scripts /var/cache/pacman/pkg /var/lib/mysql /opt
root 4500 0.0 0.0 4544 424 ? S 04:12 0:00 /bin/bash /etc/cron.daily/backup
root 4501 2.1 0.2 7124 2588 ? DN 04:12 6:16 python /var/scripts/backup2 --clean /etc /boot /share /sr v/www /home /var/scripts /var/cache/pacman/pkg /var/lib/mysql /opt
root 4555 0.0 0.0 4544 436 ? S 04:22 0:00 /bin/bash /etc/cron.daily/backup
root 4556 2.2 0.2 7128 2380 ? RN 04:22 6:11 python /var/scripts/backup2 --clean /etc /boot /share /sr v/www /home /var/scripts /var/cache/pacman/pkg /var/lib/mysql /opt
root 4645 0.0 0.0 4544 444 ? S 04:32 0:00 /bin/bash /etc/cron.daily/backup
root 4646 2.2 0.2 7128 2392 ? DN 04:32 6:02 python /var/scripts/backup2 --clean /etc /boot /share /sr v/www /home /var/scripts /var/cache/pacman/pkg /var/lib/mysql /opt
root 4743 0.0 0.0 4544 436 ? S 04:41 0:00 /bin/bash /etc/cron.daily/backup
root 4744 2.2 0.2 7124 2364 ? DN 04:41 5:59 python /var/scripts/backup2 --clean /etc /boot /share /sr v/www /home /var/scripts /var/cache/pacman/pkg /var/lib/mysql /opt
root 4790 0.0 0.0 4544 452 ? S 04:51 0:00 /bin/bash /etc/cron.daily/backup
root 4791 2.4 0.2 7128 2284 ? DN 04:51 6:06 python /var/scripts/backup2 --clean /etc /boot /share /sr v/www /home /var/scripts /var/cache/pacman/pkg /var/lib/mysql /opt
root 4849 0.0 0.0 4544 460 ? S 05:01 0:00 /bin/bash /etc/cron.daily/backup
root 4850 2.4 0.2 7132 2376 ? DN 05:01 5:59 python /var/scripts/backup2 --clean /etc /boot /share /sr v/www /home /var/scripts /var/cache/pacman/pkg /var/lib/mysql /opt
jeff 7043 0.0 0.0 3832 840 pts/0 S+ 09:02 0:00 grep backupCan anyone tell me why crond is spawning multiple copies of the scripts in its daily directory? All the other scripts in the directory run quickly. If one script fails on an error, will run-cron reprocess the entire queue?
...using Arch as a home server since 2006.
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#2 2010-04-22 15:22:59
- ataraxia
- Member
- From: Pittsburgh
- Registered: 2007-05-06
- Posts: 1,553
Re: crond spawns multiple copies of my script
It's a bug in cron to run @daily, @hourly, etc jobs on wrong schedules. Jim is working on it.
If you want to work around it, either switch to using a manually-defined time instead of @daily, or put some locking in /etc/cron.daily/backup.
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#3 2010-04-22 22:32:42
- ngoonee
- Forum Fellow
- From: Between Thailand and Singapore
- Registered: 2009-03-17
- Posts: 7,362
Re: crond spawns multiple copies of my script
Ah, that would explain why pkgfile ran itself multiple times the other day... thanks ataraxia
Allan-Volunteer on the (topic being discussed) mailn lists. You never get the people who matters attention on the forums.
jasonwryan-Installing Arch is a measure of your literacy. Maintaining Arch is a measure of your diligence. Contributing to Arch is a measure of your competence.
Griemak-Bleeding edge, not bleeding flat. Edge denotes falls will occur from time to time. Bring your own parachute.
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#4 2010-04-23 13:36:41
- jeffmikels
- Member
- Registered: 2007-04-19
- Posts: 37
Re: crond spawns multiple copies of my script
Was this bug reported in the news feed? I didn't see it.
...using Arch as a home server since 2006.
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#5 2010-04-23 13:38:50
- jeffmikels
- Member
- Registered: 2007-04-19
- Posts: 37
Re: crond spawns multiple copies of my script
Here's my modified crontab:
# root crontab
# DO NOT EDIT THIS FILE MANUALLY! USE crontab -e INSTEAD
# man 1 crontab for acceptable formats:
# <minute> <hour> <day> <month> <dow> <tags and command>
# <@freq> <tags and command>
# SYSTEM DAILY/WEEKLY/... FOLDERS
#@hourly ID=sys-hourly /usr/sbin/run-cron /etc/cron.hourly
20 * * * * ID=sys-hourly /usr/sbin/run-cron /etc/cron.hourly
#@daily ID=sys-daily /usr/sbin/run-cron /etc/cron.daily
30 01 * * * ID=sys-daily /usr/sbin/run-cron /etc/cron.daily
#@weekly ID=sys-weekly /usr/sbin/run-cron /etc/cron.weekly
40 02 * * 00 ID=sys-weekly /usr/sbin/run-cron /etc/cron.weekly
#@monthly ID=sys-monthly /usr/sbin/run-cron /etc/cron.monthly
50 03 01 * * ID=sys-monthly /usr/sbin/run-cron /etc/cron.monthly...using Arch as a home server since 2006.
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