Crontab on Linux Webapp Container

Question

Hi.

I'm running a Laravel Application in my container and require the scheduler to run a command every minute as seen here.
https://laravel.com/docs/7.x/scheduling#introduction I'm quite new with container and docker as well as Azure Services.

I'm building my application trough a deployment slot on my container using Azure Dev-ops, this uses the docker file to build my application container and run it then deploy to the slot. currently stuck with being able to run my scheduler trough a cron-job or command.

Hoping you might be able to assist me.

Kind Regards

Answer 1

Thanks for asking question!

For Custom Containers you may follow below steps.

1. Enable CRON job for custom containers:
2. To Enable cron, add the following line to Dockerfile: RUN apt-get install -yqq cron
3. And following line in the container init script (init_container.sh)
   (crontab -l && echo "* * * * * echo 'hello from cron' >> /home/site/wwwroot/cron1.txt")|crontab
4. In this case we will write “hello from cron” to file /home/site/wwwroot/cron1.txt every minute. You can replace this with anything else you wish to run periodically.
5. echo 'hello from cron' >> /home/site/wwwroot/cron1.txt
6. for crontab syntax please refer to:
7. List item

https://www.adminschoice.com/crontab-quick-reference

https://crontab-generator.org/

•For Blessed Images:

1. Create a script file in /home directory of the App Service and trigger it via the startup command under Configuration blade.
2. A test script which installs cron as well as create a CRON job:

   !/bin/sh

apt-get update -qq && apt-get install cron -yqq

service cron start

mkdir /home/BackupLogs

(crontab -l 2>/dev/null; echo "*/5 * * * * cp /home/LogFiles/*.log /home/BackupLogs")|crontab

Hope this helps!

Answer 2

I don't know if you resolved this, or find any other challenges, but i couldn't make the scheduler work. Using Linux Web app, added a script to install cron and configure it and didn't work.

until... i added the full php path.

• • • • • /usr/bin/local/php /home/site/wwwroot/artisan schedule:run

Answer 3

When running on blessed images (PHP 8 in linux app service) you need to use the following path

/usr/local/bin/php

Not the

/usr/bin/local/php mentioned above.

So for laravel artisan it's

E.G. /usr/local/bin/php /home/site/wwwroot/artisan migrate