I have a simple backup system that starts off a backup once per night
during the weekdays. There is a crontab file in /etc/cron.d with the
following entries:
################################################################################
# Beam Bbackup cron setup Backup to ...
################################################################################
#
# Min Hour Day Month WeekDay
# Perform incremental backup to every work day
01 23 * * 1 root /src/bbackup/bbackup-beam
01 23 * * 2 root /src/bbackup/bbackup-beam
01 23 * * 3 root /src/bbackup/bbackup-beam
01 23 * * 4 root /src/bbackup/bbackup-beam
01 23 * * 5 root /src/bbackup/bbackup-beam
This system has been in use for 10 years or more on various Fedora
versions. However about 18 months ago I have seen a problem where cron
will start two backups with identical start times occasionally.
I have had to add a file lock system in the bbackup-beam to cope with this.
Any idea on why cron might start the same job off twice at the same time
? Could there be a time change issue with chronyd ?
Terry
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