cisagov/example repository overview

⁠skeleton-docker 💀🐳

⁠Docker Image

This is a Docker skeleton project that can be used to quickly get a new cisagov⁠ GitHub Docker project started. This skeleton project contains licensing information⁠, as well as pre-commit hooks⁠ and GitHub Actions⁠ configurations appropriate for Docker containers and the major languages that we use.

⁠Running

⁠Running with Docker

To run the cisagov/example image via Docker:

docker run cisagov/example:1.0.0

⁠Running with Docker Compose

1. Create a compose.yml file similar to the one below to use Docker Compose⁠.

   ---
   name: skeleton-docker
   
   services:
     example:
       environment:
         - ECHO_MESSAGE="Hello from Docker Compose"
       image: cisagov/example:1.0.0
       ports:
         - protocol: tcp
           published: "8080"
           target: 8080
       volumes:
         - source: <your_log_dir>
           target: /var/log
           type: bind
   

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2. Start the container and detach:

   docker compose up --detach
   

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⁠Using secrets with your container

This container also supports passing sensitive values via Docker secrets⁠. Passing sensitive values like your credentials can be more secure using secrets than using environment variables. See the secrets⁠ section below for a table of all supported secret files.

1. To use secrets, create a quote.txt file containing the values you want set:

   Better lock it in your pocket.
   

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2. Then add the secret to your compose.yml file:

   ---
   name: skeleton-docker
   
   secrets:
     quote_txt:
       file: quote.txt
   
   services:
     example:
       environment:
         - ECHO_MESSAGE="Hello from Docker Compose"
       image: cisagov/example:1.0.0
       ports:
         - protocol: tcp
           published: "8080"
           target: 8080
       secrets:
         - source: quote_txt
           target: quote.txt
       volumes:
         - source: <your_log_dir>
           target: /var/log
           type: bind
   

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⁠Updating your container

⁠Docker Compose

1. Pull the new image from Docker Hub:

   docker compose pull
   

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2. Recreate the running container by following the previous instructions⁠:

   docker compose up --detach
   

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⁠Docker

1. Stop the running container:

   docker stop <container_id>
   

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2. Pull the new image:

   docker pull cisagov/example:1.0.0
   

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3. Recreate and run the container by following the previous instructions⁠.

⁠Updating Python dependencies

This image uses Pipenv⁠ to manage Python dependencies using a Pipfile⁠. Both updating dependencies and changing the Pipenv⁠ configuration in src/Pipfile will result in a modified src/Pipfile.lock file that should be committed to the repository.

⁠Updating dependencies

If you want to update existing dependencies you would run the following command in the src/ subdirectory:

pipenv lock

⁠Modifying dependencies

If you want to add or remove dependencies you would update the src/Pipfile file and then update dependencies as you would above.

⁠Image tags

The images of this container are tagged with semantic versions⁠ of the underlying example project that they containerize. It is recommended that most users use a version tag (e.g. :1.0.0).

See the tags tab⁠ on Docker Hub for a list of all the supported tags.

⁠Volumes

⁠Ports

The following ports are exposed by this container:

The sample Docker composition⁠ publishes the exposed port at 8080.

⁠Environment variables

⁠Required

There are no required environment variables.

⁠Optional

⁠Secrets

⁠Building from source

Build the image locally using this git repository as the build context⁠:

docker build \
  --tag cisagov/example:1.0.0 \
  https://github.com/cisagov/skeleton-docker.git#v1.0.0

⁠Cross-platform builds

To create images that are compatible with other platforms, you can use the buildx⁠ feature of Docker:

1. Copy the project to your machine using the Code button above or the command line:

   git clone https://github.com/cisagov/skeleton-docker.git
   cd skeleton-docker
   

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2. Create the Dockerfile-x file with buildx platform support:

   ./buildx-dockerfile.sh
   

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3. Build the image using buildx:

   docker buildx build \
     --file Dockerfile-x \
     --platform linux/amd64 \
     --output type=docker \
     --tag cisagov/example:1.0.0 .
   

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⁠New repositories from a skeleton

Please see our Project Setup guide⁠ for step-by-step instructions on how to start a new repository from a skeleton. This will save you time and effort when configuring a new repository!

⁠Contributing

We welcome contributions! Please see CONTRIBUTING.md⁠ for details.

⁠License

This project is in the worldwide public domain⁠.

This project is in the public domain within the United States, and copyright and related rights in the work worldwide are waived through the CC0 1.0 Universal public domain dedication⁠.

All contributions to this project will be released under the CC0 dedication. By submitting a pull request, you are agreeing to comply with this waiver of copyright interest.