How to launch an app via Docker on every Pull Request?

I run Jenkins and my app is dockerized, i.e. when I run the container it exposes port 3000 and I can point my browser there. On every Github PR I would like to deploy that git commit to a running container somewhere and have Jenkins post back to the PR the link where it can be accessed. On any PR updates it gets auto re-deployed and on PR close/resolve it gets torn down.

I have looked at kubernetes and a little rancher, but what’s the easiest way to get this going assuming I can only deploy to one box?

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  • 3 Solutions collect form web for “How to launch an app via Docker on every Pull Request?”

    There is a jenkins plugin github-pullrequest can resolve your problem.

    Prerequisites:

    1. You have a jenkins server can access by internet if you want trigger your build by a webhook.
    2. Your have a github API token to access/admin your git repository, it can be generate by yourself in settings.

    Please follow the guide configuration to setup your jenkins integration with github.

    After configuration:

    • you can trigger your build by PR events: opened/commit changed/closed, or comment with specific pattern.
    • you can get a PR status via environment variable ${GITHUB_PR_STATE}, so you can start or stop a container on specific value.
    • you can publish a comment to a PR to tell the address of your web service after you started docker container.

    About expose port of cotainer with multi PR, your can just run container with -p 3000, it will auto expose a port in a range on the docker host, docker port <container> will show the specific port number, so for example:

    • container1 with address <host>:32667 for PR1
    • container2 with address <host>:35989 for PR2

    I think the simplest solution to this would be to create two different Jenkins Jobs, one which deploys and the other which nukes it. The trigger for this can be set 2 webhooks in GitHub one for PR create and one for PR resolve.

    As Sylvain GIROD pointed out:

    With only one box to run the application you need to change the port that is exposed. When a GitHub PR happens you deploy your application (docker run -p newport:containerport). If you are deploying services you change the target port.

    Then you send the link with this port back to the user (email?).

    Additionally you need some key-value store to remember which pod was created for which users so that you can decide on a new PR whether to destroy the old containers.

    I would also suggest giving the services a time to live and regularly cleaning up stale containers/services.

    Docker will be the best open platform for developers and sysadmins to build, ship, and run distributed applications.