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https://github.com/cisagov/skeleton-docker
A skeleton project for quickly getting a new cisagov Docker container started.
https://github.com/cisagov/skeleton-docker
docker skeleton
Last synced: 3 months ago
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A skeleton project for quickly getting a new cisagov Docker container started.
- Host: GitHub
- URL: https://github.com/cisagov/skeleton-docker
- Owner: cisagov
- License: cc0-1.0
- Created: 2019-06-06T18:56:13.000Z (over 5 years ago)
- Default Branch: develop
- Last Pushed: 2024-06-07T14:36:48.000Z (5 months ago)
- Last Synced: 2024-06-08T00:41:07.702Z (5 months ago)
- Topics: docker, skeleton
- Language: Shell
- Size: 751 KB
- Stars: 14
- Watchers: 7
- Forks: 6
- Open Issues: 15
-
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Codeowners: .github/CODEOWNERS
Awesome Lists containing this project
README
# skeleton-docker 💀🐳 #
[](https://github.com/cisagov/skeleton-docker/actions/workflows/build.yml)
[](https://github.com/cisagov/skeleton-docker/actions/workflows/codeql-analysis.yml)
[](https://snyk.io/test/github/cisagov/skeleton-docker)
## Docker Image ##
[](https://hub.docker.com/r/cisagov/example)
[](https://hub.docker.com/r/cisagov/example)
[](https://hub.docker.com/r/cisagov/skeleton-docker/tags)
This is a Docker skeleton project that can be used to quickly get a
new [cisagov](https://github.com/cisagov) GitHub Docker project
started. This skeleton project contains [licensing
information](LICENSE), as well as [pre-commit hooks](https://pre-commit.com)
and [GitHub Actions](https://github.com/features/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:
```console
docker run cisagov/example:0.0.1
```
### Running with Docker Compose ###
1. Create a `docker-compose.yml` file similar to the one below to use [Docker Compose](https://docs.docker.com/compose/).
```yaml
---
version: "3.7"
services:
example:
image: cisagov/example:0.0.1
volumes:
- type: bind
source:
target: /var/log
environment:
- ECHO_MESSAGE="Hello from docker compose"
ports:
- target: 8080
published: 8080
protocol: tcp
```
1. Start the container and detach:
```console
docker compose up --detach
```
## Using secrets with your container ##
This container also supports passing sensitive values via [Docker
secrets](https://docs.docker.com/engine/swarm/secrets/). Passing sensitive
values like your credentials can be more secure using secrets than using
environment variables. See the
[secrets](#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:
```text
Better lock it in your pocket.
```
1. Then add the secret to your `docker-compose.yml` file:
```yaml
---
version: "3.7"
secrets:
quote_txt:
file: quote.txt
services:
example:
image: cisagov/example:0.0.1
volumes:
- type: bind
source:
target: /var/log
environment:
- ECHO_MESSAGE="Hello from docker compose"
ports:
- target: 8080
published: 8080
protocol: tcp
secrets:
- source: quote_txt
target: quote.txt
```
## Updating your container ##
### Docker Compose ###
1. Pull the new image from Docker Hub:
```console
docker compose pull
```
1. Recreate the running container by following the [previous instructions](#running-with-docker-compose):
```console
docker compose up --detach
```
### Docker ###
1. Stop the running container:
```console
docker stop
```
1. Pull the new image:
```console
docker pull cisagov/example:0.0.1
```
1. Recreate and run the container by following the [previous instructions](#running-with-docker).
## Image tags ##
The images of this container are tagged with [semantic
versions](https://semver.org) of the underlying example project that they
containerize. It is recommended that most users use a version tag (e.g.
`:0.0.1`).
| Image:tag | Description |
|-----------|-------------|
|`cisagov/example:1.2.3`| An exact release version. |
|`cisagov/example:1.2`| The most recent release matching the major and minor version numbers. |
|`cisagov/example:1`| The most recent release matching the major version number. |
|`cisagov/example:edge` | The most recent image built from a merge into the `develop` branch of this repository. |
|`cisagov/example:nightly` | A nightly build of the `develop` branch of this repository. |
|`cisagov/example:latest`| The most recent release image pushed to a container registry. Pulling an image using the `:latest` tag [should be avoided.](https://vsupalov.com/docker-latest-tag/) |
See the [tags tab](https://hub.docker.com/r/cisagov/example/tags) on Docker
Hub for a list of all the supported tags.
## Volumes ##
| Mount point | Purpose |
|-------------|----------------|
| `/var/log` | Log storage |
## Ports ##
The following ports are exposed by this container:
| Port | Purpose |
|------|----------------|
| 8080 | Example only; nothing is actually listening on the port |
The sample [Docker composition](docker-compose.yml) publishes the
exposed port at 8080.
## Environment variables ##
### Required ###
There are no required environment variables.
### Optional ###
| Name | Purpose | Default |
|-------|---------|---------|
| `ECHO_MESSAGE` | Sets the message echoed by this container. | `Hello World from Dockerfile` |
## Secrets ##
| Filename | Purpose |
|--------------|---------|
| `quote.txt` | Replaces the secret stored in the example library's package data. |
## Building from source ##
Build the image locally using this git repository as the [build context](https://docs.docker.com/engine/reference/commandline/build/#git-repositories):
```console
docker build \
--build-arg VERSION=0.0.1 \
--tag cisagov/example:0.0.1 \
https://github.com/cisagov/example.git#develop
```
## Cross-platform builds ##
To create images that are compatible with other platforms, you can use the
[`buildx`](https://docs.docker.com/buildx/working-with-buildx/) feature of
Docker:
1. Copy the project to your machine using the `Code` button above
or the command line:
```console
git clone https://github.com/cisagov/example.git
cd example
```
1. Create the `Dockerfile-x` file with `buildx` platform support:
```console
./buildx-dockerfile.sh
```
1. Build the image using `buildx`:
```console
docker buildx build \
--file Dockerfile-x \
--platform linux/amd64 \
--build-arg VERSION=0.0.1 \
--output type=docker \
--tag cisagov/example:0.0.1 .
```
## New repositories from a skeleton ##
Please see our [Project Setup guide](https://github.com/cisagov/development-guide/tree/develop/project_setup)
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`](CONTRIBUTING.md) for
details.
## License ##
This project is in the worldwide [public domain](LICENSE).
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](https://creativecommons.org/publicdomain/zero/1.0/).
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.