Comments (7)
An alternative syntax for your use case would be something like 0 0,12 * * *
from docker-volume-backup.
This looks as if your setup somehow triggers two concurrent invocations of the backup procedure and the second invocation fails because it cannot acquire the exclusive lock that guarantees no concurrent invocations are happening.
My initial suspicion would be that Busybox's cron
does not like your cron expression, but then again, I'm not sure why, docs themselves are rather stiff lipped:
crontab
crontab [-c DIR] [-u USER] [-ler]|[FILE]
-c Crontab directory
-u User
-l List crontab
-e Edit crontab
-r Delete crontab
FILE Replace crontab by FILE ('-': stdin)
Could you try using a super simple cron expression like 0 12 * * *
and check whether the issue persists?
from docker-volume-backup.
Thanks, I'll try to use the latter (0 0,12 * * *)
and I'll let you know in a couple of days
from docker-volume-backup.
I confirm, It's working : (0 0,12 * * *)
from docker-volume-backup.
Good to know and thanks for the feedback. I'll add a note to the README about the cron syntax being limited in strange ways.
from docker-volume-backup.
So it seems busybox should support the syntax you have been using:
/ # crontab -l
# do daily/weekly/monthly maintenance
# min hour day month weekday command
*/15 * * * * run-parts /etc/periodic/15min
0 * * * * run-parts /etc/periodic/hourly
0 2 * * * run-parts /etc/periodic/daily
0 3 * * 6 run-parts /etc/periodic/weekly
0 5 1 * * run-parts /etc/periodic/monthly
which makes me wonder if someone expands that *
in the expression when creating the crontab entry. I'll need to do some further investigation on this.
from docker-volume-backup.
It seems this is caused by the 00
in your example. Not sure why, but I cannot repro the issue when using single 0
s in any way.
from docker-volume-backup.
Related Issues (20)
- "Page not found" error when using with balena HOT 9
- Hard to understand error message during exec HOT 3
- archive-pre is triggered on each container backup instead of just container with exec-label HOT 3
- Health Check HOT 6
- Notifications Delay HOT 1
- Replace Log line feeds with HTML <br> tag HOT 3
- Backup the entire content without directory HOT 4
- Backup to subfolders HOT 2
- Resolve date in AWS_S3_PATH HOT 1
- Can't get stop during backup working HOT 2
- Remove local backup after upload to S3 HOT 3
- Invalid memory address crash when running a backup HOT 16
- Fail to configure cron schedule HOT 3
- Docker swarm error HOT 5
- "swarm exec" support HOT 1
- "input/output error" when copying file to NFS mount HOT 4
- Azure storage: Support access tier HOT 2
- schedule the docker-volume-backup? HOT 1
- [Feature] Automated backups of all named volumes HOT 6
- [FR] upgrade `shoutrrr` to v0.8.0 to support custom fields in calls to Generic Webhooks HOT 3
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from docker-volume-backup.