Issue
I tried to run a cron job inside a docker container but nothing works for me.
My container has only cron.daily and cron.weekly files.
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crontab,cron.d,cron.hourly are absent in my container.
crontab -e is also not working.
My container runs with /bin/bash.
Solution
Here is how I run one of my cron containers.
Dockerfile:
FROM alpine:3.3
ADD crontab.txt /crontab.txt
ADD script.sh /script.sh
COPY entry.sh /entry.sh
RUN chmod 755 /script.sh /entry.sh
RUN /usr/bin/crontab /crontab.txt
CMD ["/entry.sh"]
crontab.txt
*/30 * * * * /script.sh >> /var/log/script.log
entry.sh
#!/bin/sh
# start cron
/usr/sbin/crond -f -l 8
script.sh
#!/bin/sh
# code goes here.
echo "This is a script, run by cron!"
Build like so
docker build -t mycron .
Run like so
docker run -d mycron
Add your own scripts and edit the crontab.txt and just build the image and run. Since it is based on alpine, the image is super small.
Answered By - Ken Cochrane Answer Checked By - Marilyn (WPSolving Volunteer)
