On 07/04/2020 08:21, Ed Greshko wrote:
On 2020-04-07 14:07, Terry Barnaby wrote:
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 ?
I don't have an answer to your question. But wonder if using just
01 23 * * 1-5 root /src/bbackup/bbackup-beam
would help avoid the problem.
I assume the system is up 24/7?
_______________________________________________
Yes, server is up 24/7.
Well I could try that, but I already have a workaround.
The reason for asking is to find out if I am doing something wrong, if
this is a known "feature" or is a bug in Fedora31. It could be a nasty
little bug for some.
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