Just drop your cronfile into /etc/cron.d/ see
https://help.ubuntu.com/community/CronHowto#Two_Other_Types_of_Crontab

On Aug 10, 2017 20:43, "Stan Svec" <stan.x.s...@gmail.com> wrote:

> I'm trying to install crontab on an AMI image using the shell provisioner
> like this:
> {
>   "type": "shell",
>   "skip_clean": true,
>   "inline": [
>     "some commands above and here and then..",
>     "(crontab -l 2> /dev/null; echo '0 03 * * * 
> /home/ec2-user/cron/some-script.sh')
> | crontab -"
>   ]
> }
> SSH username in the builder is set to *ec2-user*. The problem is that
> when I create an instance from the image and log in I cannot see any cron
> installed by checking with *crontab -l*. However when I keep the script
> on the image by setting *skip_clean* to *true* and execute the script
> again manually (as ec2-user) then the cron entry is set up. That seems
> strange to me, because all other commands in the inline sections execute
> just fine. Any thoughts please?
>
> Thanks,
>
> Stan
>
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