Image to run generic cron tasks.
Included packages/software
dcron
curl
wget
git
rsync
ca-certificates
Crond
Image is designed to run crontabs as root. This means that your cron tab file needs to be placed in specific locations
crontab file locations:
- /etc/crontabs/root
- contains run-parts schedules
- /etc/cron.d/
- put in custom crontab files here
run-parts files:
- /etc/periodic/15min/
- /etc/periodic/hourly/
- /etc/periodic/daily/
- /etc/periodic/weekly/
- /etc/periodic/monthly/
run-parts files are basically sh files without the extension. Here are some tips when making these files:
- Make sure the script is executable (chmod a+x [scriptname])
- Make sure the first line of the script is: #!/bin/sh
- The file name cannot have an extension!
Example Run Command
docker run -d \
--name my-crond \
--restart="unless-stopped" \
--mount type=bind,source=/etc/localtime,target=/etc/localtime,readonly \
--mount type=bind,source=./myscript,target="/etc/periodic/15min/myscript",readonly \
wolfereign/crond:latest
The above command will bind mount a run-parts script/file to the containers directory that gets run every 15 minutes.
Example Script (myscript)
#!/bin/sh
echo "hello world!!" >> /root/myscript.log