While I was setting up a new Image for running a app in a Rancher (v1.6) Cluster I had a real annoying problem.
I’m using a php:apache to run a default Laravel app. The CI/CD Pipeline will deploy all stages like dev, master and feature branches on separate instances. When a Container will be deployed Laravel should also migrate its Database automatically. For this I wanted to run php artisan migrate after it’s start.
The simplest solution was to add a command: php artisan migrate to my docker-compose.yml based on the image.
Finally I came up with this solution:
I added this as file to /usr/local/bin/entrypoint-wrapper.
Then I created a custom Image like the following:
COPY entrypoint-wrapper /usr/local/bin/
RUN chmod 775 /usr/local/bin/entrypoint-wrapper
ENTRYPOINT [ "entrypoint-wrapper" ]
The wrapper will run the given command then run the default entrypoint with the default argument as define in the base Image https://github.com/docker-library/php/blob/master/7.2/stretch/apache/Dockerfile#L252.
- At the time the command is executed, Apache has not yet started.
- This will be executed for each container start, so don’t run commands that can’t be multiple times.
(Internally it will run https://github.com/docker-library/php/blob/master/7.2/stretch/apache/docker-php-entrypoint runs with parameter https://github.com/docker-library/php/blob/master/7.2/stretch/apache/apache2-foreground.)
UPDATE: I changed the script to never start apache in foreground if its executed in a CI/CD Pipeline. Otherwise the Job will run till the run timeout is reached.