If you’re creating a web backend, that would mean one container to provide your web server and another which runs cron in the foreground. Wherever possible, you should run your cron tasks in a separate container to your application. Ideally, each container should provide one specific unit of functionality. Your containers end up with two responsibilities – firstly, to provide the application’s functionality, and secondly, to keep cron alive and run the scheduled tasks. This still results in mixing of concerns though. Adding the cron daemon to the containers that serve your application ensures anyone consuming your Docker image will have scheduled tasks setup automatically. Implementing the setup described in the preceding section provides a more robust solution than relying on the host’s crontab. RELATED: How to Install Docker and Docker Compose on Linux Separating Cron From Your Application’s Services ENTRYPOINT ) and add service cron start as a command within that file. This will launch a new Docker container and run. If you need to keep another process in the foreground, such as a web server, you should create a dedicated entrypoint script (e.g. Go ahead and give the following command a try: docker run -p 5900:5900 -e VNCSERVERPASSWORDpassword -user apps -privileged local/chrome:0.0.1. If your container’s only task is to run cron – which we’ll discuss more below – you can add ENTRYPOINT to your Dockerfile to launch it as the foreground process. The service would be started within the ephemeral container used to build the layer, not the final containers running the completed image. You can’t achieve this with a RUN stage in your Dockerfile because these are transient steps which don’t persist beyond the image’s build phase. To complete this setup, you’ll need to amend your image’s command or entrypoint to start the cron daemon when containers begin to run.
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