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 Docker Images

CNB pipelines include built-in credentials of the triggerer, which can be used to log into CNB Docker Artifact and push images directly. To push to third-party registries, add imports for credentials and a docker login step.

Push to CNB Artifact

.cnb.yml
main:
  push:
    - services:
        - docker
      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 Registry

.cnb.yml
main:
  push:
    - services:
        - docker
      imports: https://cnb.cool/<your-repo-slug>/-/blob/main/xxx/docker-envs.yml
      stages:
        - name: docker login
          script: echo "${DOCKER_PWD}" | docker login -u ${DOCKER_USER} --password-stdin ${DOCKER_REGISTRY}
        - name: set docker tag
          script: echo -n "${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

The docker-envs.yml file content (must be placed in the xxx/ directory, matching the imports path):

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