mirror of
https://github.com/redhat-actions/buildah-build.git
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160 lines
4.9 KiB
Markdown
160 lines
4.9 KiB
Markdown
# buildah-action
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[](https://github.com/redhat-actions/buildah-action/tags)
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[](./LICENSE)
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[](./dist)
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Buildah is a GitHub Action for building OCI-compatible (Docker- and Kubernetes-compatible) images quickly and easily.
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Buildah action works only on Linux distributions, and it is not supported on Windows or Mac platforms at this time.
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Note that GitHub's [Ubuntu Environments](https://github.com/actions/virtual-environments#available-environments) (ubuntu-20.04 and ubuntu-18.04) come with buildah 1.17.0 installed. So, if you are not using those Ubuntu environments you need to make sure to install buildah tool in an early step.
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## Action Inputs
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<table>
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<thead>
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<tr>
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<th>Input</th>
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<th>Required</th>
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<th>Description</th>
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</tr>
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</thead>
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<tr>
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<td>image</td>
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<td>Yes</td>
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<td>Name to give to the image that will be eventually created.</td>
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</tr>
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<tr>
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<td>tag</td>
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<td>No</td>
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<td>Tag to give to the image that will be eventually created (default: latest)</td>
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</tr>
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<tr>
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<td>base-name</td>
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<td>No</td>
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<td>The base image to use to create the initial container. If not specified, the action will try to pick one automatically. (N.B: At this time the action is only able to auto select Java base image)</td>
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</tr>
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<tr>
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<td>dockerfiles</td>
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<td>No</td>
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<td>The list of Dockerfile paths to perform a build using docker instructions. This is a multiline input to add multiple values.</td>
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</tr>
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<tr>
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<td>context</td>
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<td>No</td>
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<td>The path of the directory to use as context (default: .)</td>
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</tr>
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<tr>
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<td>content</td>
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<td>No</td>
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<td>The content to copy inside the container to create the final image. This is a multiline input to allow you to copy more than one file/directory. For example - <br> content: | <br> target/spring-petclinic-2.3.0.BUILD-SNAPSHOT.jar</td>
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</tr>
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<tr>
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<td>entrypoint</td>
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<td>No</td>
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<td>The entry point to set for the container. This is a multiline input to add multiple values. For example - <br> entrypoint: | <br> java <br> -jar <br> spring-petclinic-2.3.0.BUILD-SNAPSHOT.jar</td>
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</tr>
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<tr>
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<td>port</td>
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<td>No</td>
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<td>The port to expose when running the container.</td>
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</tr>
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<tr>
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<td>working-dir</td>
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<td>No</td>
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<td>The working directory to use within the container.</td>
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</tr>
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<tr>
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<td>envs</td>
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<td>No</td>
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<td>The environment variables to be set when running the container. This is a multiline input to add multiple environment variables.For example - <br> envs: | <br> GOPATH=/root/buildah</td>
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</tr>
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</table>
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## Build an image using Dockerfile or from scratch
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One of the advantages of using the `buildah` action is that you can decide the way you want to build your image.
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If you have been using Docker and have some existing Dockerfiles, `buildah` is able to build images by using them.
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In this case the inputs needed are just `image`, `dockerfiles` and `content`.
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An example below
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```yaml
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name: Build Image using Dockerfile
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on: [push]
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jobs:
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build:
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name: Build image
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runs-on: ubuntu-latest
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steps:
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- name: Checkout
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uses: actions/checkout@v2
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- name: Buildah Action
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uses: redhat-actions/buildah-action@v1
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with:
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image: awesome-name:v1
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dockerfiles: |
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./Dockerfile
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```
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On the other hand, a build from scratch may require more inputs as it needs to execute a series of steps that can be summarized in:
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- Create a new container by using the base image (input: `base-image`)
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- Copy all files/directories inside the newly-created container (input: `content`)
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- Set up the image configuration values (inputs: `entrypoint`,`port`,`envs`)
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- Build an optimized image
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Example of building a Spring Boot Java app image below
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```yaml
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name: Build Image
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on: [push]
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jobs:
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build:
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name: Build image
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runs-on: ubuntu-latest
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steps:
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- name: Checkout
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uses: actions/checkout@v2
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- name: Maven
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run: mvn package
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- name: Build Action
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uses: redhat-actions/buildah-action@v1
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with:
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image: awesome-name:v1
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content: |
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target/spring-petclinic-2.3.0.BUILD-SNAPSHOT.jar
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entrypoint: |
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java
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-jar
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spring-petclinic-2.3.0.BUILD-SNAPSHOT.jar
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port: 8080
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```
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## Contributing
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This is an open source project open to anyone. This project welcomes contributions and suggestions!
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## Feedback & Questions
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If you discover an issue please file a bug in [GitHub issues](https://github.com/redhat-actions/buildah/issues) and we will fix it as soon as possible.
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## License
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MIT, See [LICENSE](https://github.com/redhat-actions/buildah/blob/main/LICENSE.md) for more information.
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