7. Container Image build

This lab covers packaging the application by building a Container Image.

Task 7.1: Create Image build stage

Image builds are done inside a package stage.

Create a new job with the following configuration which runs inside the new package stage:

• job name: build_image
• image: diemobiliar.azurecr.io/dlp-cicd-dockercli-image:254
• Add a tag block to select a suitable Runner

  tags:
    - build
    - mobiliar
  

• Add a service block to enable the Docker in Docker builds

  services:
    - docker:dind
  

• before_script: docker info
• script:

  - docker build --no-cache -t $IMAGE_NAME .
  - IMAGE_PATH=$IMAGE_HOST/$IMAGE_REPOSITORY/$IMAGE_NAME:${CI_COMMIT_SHA:0:8}
  - echo "docker image path is - $IMAGE_PATH"
  - docker tag $IMAGE_NAME $IMAGE_PATH
  # - docker login -u ${DOCKER_USERNAME} -p ${DOCKER_PASSWORD} ${IMAGE_HOST}
  # - docker push $IMAGE_PATH
  

This Job builds the container image defined by the Dockerfile in your source code. In the real world, the resulting container image would now be pushed into a container registry for simplicity reasons, we skip this step in our pipeline.

Did you see the required variables inside the script? Also add the following variables to the variables block:

• IMAGE_HOST: ‘quay.io’
• IMAGE_REPOSITORY: ‘puzzle’
• IMAGE_NAME: ’example-spring-boot'

stages:
  - info
  - build
  - test
  - package

variables:
  GIT_STRATEGY: 'clone'
  COMPILE: 'false'
  IMAGE_HOST: 'quay.io'
  IMAGE_REPOSITORY: 'puzzle'
  IMAGE_NAME: 'example-spring-boot'

info:
  stage: info
  script:
    - echo "This is your first stage (ツ)"
    - echo "Username is ${USERNAME} with ${PASSWORD}"

build_application:
  stage: build
  tags:
    - build
    - mobiliar
  image: registry.access.redhat.com/ubi9/openjdk-17:latest
  script:
    - ./gradlew assemble

test_application:
  stage: test
  image: registry.access.redhat.com/ubi9/openjdk-17:latest
  script:
    - ./gradlew check
  artifacts:
    when: always
    reports:
      junit: build/test-results/test/**/TEST-*.xml

build_image:
  image: diemobiliar.azurecr.io/dlp-cicd-dockercli-image:254
  tags:
    - build
    - mobiliar
  services:
    - docker:dind
  stage: package
  before_script:
    - docker info
  script:
    - docker build --no-cache -t $IMAGE_NAME .
    - IMAGE_PATH=$IMAGE_HOST/$IMAGE_REPOSITORY/$IMAGE_NAME:${CI_COMMIT_SHA:0:8}
    - echo "docker image path is - $IMAGE_PATH"
    - docker tag $IMAGE_NAME $IMAGE_PATH
    # - docker login -u ${DOCKER_USERNAME} -p ${DOCKER_PASSWORD} ${IMAGE_HOST}
    # - docker push $IMAGE_PATH

Task 7.2: Check the pipeline

Go to your GitLab project and check the pipelines under Build –> Pipelines.

Check that the image build job was successful.