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Docker

Building the container

In the base PrairieLearn directory run:

docker build -t prairielearn .

Running the container

See the installation page.

docker run primer

Here's what the various parts of the docker run commands mean.

The basic format is docker run [OPTIONS] IMAGE [COMMAND], with the parts in brackets being optional.

Options

  • -it means "run this container interactively."
  • --rm means "delete this container when I'm done with it." Unless you have a reason to keep a container, you should always use this flag.
  • -p 3000:3000 means "forward port 3000 on the host to port 3000 in the container."
  • -v /path/to/course:/course means "mount /path/to/course on the host as /course in the container."
  • --name pl gives the container a human-friendly name.

Useful commands

In all of these commands, IMAGE refers to a docker image; if you built the image manually (with docker build), then you should use prairielearn. If you downloaded it (following the installation guide), use prairielearn/prairielearn.

Most of these should be run from the root of your course directory.

  • List running containers:

      docker ps

  • Run a specific command in the container:

      docker run -it --rm -p 3000:3000 -v /path/to/course:/course IMAGE COMMAND

    E.g.,

      docker run -it --rm -p 3000:3000 -v /path/to/course:/course IMAGE ls -lah /course

  • Start an interactive shell session:

      docker run -it --rm -p 3000:3000 -v /path/to/course:/course IMAGE /bin/bash

  • Run a command in an existing container:

      docker exec -it CONTAINER_NAME COMMAND

    E.g., to start a shell in a container started with --name pl:

      docker exec -it pl /bin/bash

Docker Hub

Docker Hub automatically (re)builds the prairielearn/prairielearn image whenever a commit is pushed to master.

If you need to publish a local build, here's how:

Pushing to Docker Hub

List images:

docker images

Tag the correct one by ID:

docker tag 7d9495d03763 prairielearn/prairielearn:latest

Login to Docker Hub:

docker login

Push the image:

docker push prairielearn/prairielearn

Checking a push was successful

Delete all local versions:

docker rmi -f 7d9495d03763

Pull and run the new version:

docker run -it -p 3000:3000 -v ~/git/pl-tam212:/course prairielearn/prairielearn