Build and Push Docker Image to Artifact

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This article describes how to build a Docker image in a pipeline and push it to an artifact registry.

Push to CNB Docker Artifact

CNB pipelines include built-in credentials of the triggerer, which can be used to log into the CNB Docker Artifact and push images directly.

Example configuration:

.cnb.yml
main:
  push:
    - services:
        - docker # After declaration, docker commands can be used directly in the pipeline
      stages:
        - name: set docker tag
          script: echo -n "${CNB_DOCKER_REGISTRY}/${CNB_REPO_SLUG_LOWERCASE}:latest"
          exports:
            info: IMAGE_TAG

        - name: docker build
          script: docker build -t $IMAGE_TAG .

        - name: push image
          script: docker push $IMAGE_TAG

Push to Third-party Docker Artifacts

To push to third-party Docker artifact registries, store Docker credentials in a secret repository, then import them into the pipeline via the imports syntax.

Example configuration:

.cnb.yml
main:
  push:
    - services:
        - docker # After declaration, docker commands can be used directly in the pipeline
      # Import Docker credentials from a secret repository into environment variables
      imports: https://cnb.cool/<your-repo-slug>/-/blob/main/xxx/docker-envs.yml
      stages:
        - name: set docker tag
          script: echo -n "${DOCKER_REGISTRY}/${DOCKER_GROUP}$/${DOCKER_REPO_NAME}$:$CNB_COMMIT_SHORT"
          exports:
            info: IMAGE_TAG

        - name: docker build
          script: docker build -t $IMAGE_TAG .

        - name: push image
          script: docker push $IMAGE_TAG

docker-envs.yml file content:

DOCKER_USER: user
DOCKER_PWD: password
DOCKER_REGISTRY: docker.io
DOCKER_GROUP: group_name
DOCKER_REPO_NAME: repo_name