Cron job not running

[kasperg]

Thanks for sharing this. I wanted to try this out for a project but I am having problems getting cron jobs working.

Expected Behavior

When I set CRON_COMMAND and CRON_SCHEDULE I expect the command to be executed as define by the schedule.

Current Behavior

When these commands are set the /etc/cron.d/generated_crontab file seems to be generated as expected but as far as I can tell the command is not executed.

I cannot tell why. Some form of logging might be helpful if possible.

Steps to Reproduce (for bugs)

1. Create a docker-compose.yml file:

version: '3'
services:
  my_app:
    image: thecodingmachine/php:7.2-v1-apache
    environment:
      CRON_SCHEDULE: '* * * * *'
      CRON_COMMAND: 'php -r "echo time();"'

2. Start the service docker-compose up
3. Notice the output from Apache startup sequence in the output as expected

22:42 $ docker-compose up
Creating network "tmp_default" with the default driver
Creating tmp_my_app_1 ... done
Attaching to tmp_my_app_1
my_app_1  | [Fri Apr 27 20:42:16.690672 2018] [mpm_prefork:notice] [pid 8] AH00163: Apache/2.4.25 (Debian) PHP/7.2.4 configured -- resuming normal operations
my_app_1  | [Fri Apr 27 20:42:16.690749 2018] [core:notice] [pid 8] AH00094: Command line: 'apache2 -D FOREGROUND'

4. I had expected there to be timestamps from the cron job in the output
5. In another terminal run docker-compose exec my_app cat /etc/cron.d/generated_crontab. Output seems sensible enough

* * * * * root (php -r "echo time();") | sed -e 's/^/[Cron] /' > /proc/7/fd/1 2>/proc/7/fd/2

Your Environment

• Version used: php:7.2-v1-apache and php:7.2-v1-cli
• Operating System and version: OSX 10.13.4 + Docker for Mac 18.03.0-ce-mac60 (23751)

[kasperg]

My original case turned out not to be working for a number of other reasons which caused the cron job to fail so I am closing this.

A lesson from this could perhaps be to make it easier to get error output from cron into the docker logs.

[moufmouf]

Hey @kasperg !

I'm reopening your issue. I wrote a quick test and it seems indeed that output from cron is sent to docker logs, but not errors from cron.

I'll look into it.

[moufmouf]

Ok, this was not as easy to solve as I had expected (https://github.com/thecodingmachine/docker-images-php/pull/28/files#diff-3799b1f42986a8b0c3012d9bbb330537R28), but that's solved.

Thanks for sharing your issue and taking the time to give some feedback!