Cron won't execute none of my commands on Ubuntu 21.10 impish-CodePudding

I'm trying to run a Docker container every other minute that is stopped via cron job but it seems not working.

What I've done is launch the command crontab -e and add the line

*/1 * * * * docker start sender >> /home/cronlog.log 2>&1

I've added the user group to Docker as explained here (in fact I can access docker from the terminal without sudo)

I have also tried to add the command into a script as below

*/1 * * * * /home/start_container.sh >> /home/cronlog.log 2>&1

with the script containing

#!/bin/sh
docker start sender

but still, nothing happens. The cron process is working tho as using the command ps -ef | grep cron I got

root         881       1  0 08:42 ?        00:00:00 /usr/sbin/cron -f -P
nicola     10905   10178  0 11:31 pts/0    00:00:00 grep --color=auto cron

Am I missing something? (Obviously, the commands work if launched manually from the terminal)

CodePudding user response：

Try using the docker path instead.

type the following command to get the path of docker.

$ where docker

/usr/bin/docker
/bin/docker

then try any one of the paths in the cron script

*/1 * * * * /bin/docker start sender >> /home/cronlog.log 2>&1

*/1 * * * * /usr/bin/docker start sender >> /home/cronlog.log 2>&1

CodePudding user response：

It turned out that, for some reason, the cron doesn't like the /home/ (at least, in this specific instance)

I've fixed using another path such as

*/1 * * * * docker start sender >> /tmp/cronlog.log 2>&1