CI with GitHub Actions, Docker Hub and Spring Boot

GitHub Actions

GitHub Actions is a continuous integration and continuous delivery (CI/CD) platform that allows you to automate your build, test, and deployment pipeline. You can create workflows that build and test every pull request to your repository, or deploy merged pull requests to production.

GitHub Actions provided several options to set up a workflow, in this case we used java with maven.

Click on Java with Maven Configure and set up this workflow. github/workflows/ directory, create a new file called ci.yml

Workflow file

A workflow is a configurable automated process made up of one or more jobs. You must create a YAML file to define your workflow configuration.

Specifies the trigger for this workflow. in this case push.

on:

  push:

    branches: [ "master" ]

  pull_request:

    branches: [ "master" ]

Groups together all the jobs that run in the workflow.

jobs:

Build Spring boot application with maven

- name: Set up JDK 17

        uses: actions/setup-java@v2

        with:

          java-version: '17'

          distribution: 'adopt'

          cache: maven

      - name: Build with Maven

        run: mvn -B package --file pom.xml

Build imagen and publish in Docker Hub, Set your dockerhubuser and dockerHubRepository.

I get yaml file from GitHub Docker build.

- name: Set up Docker Buildx

        uses: docker/setup-buildx-action@v1

      - name: Login to DockerHub

        uses: docker/login-action@v1

        with:

          username: ${{ secrets.DOCKERHUB_USERNAME }}

          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Build and push

        id: docker_build

        uses: docker/build-push-action@v2

        with:

          context: .    

          push: true

          tags: dockerhubuser/dockerHubRepository:${{github.run_number}}

GitHub secrets

DOCKERHUB_USERNAME And DOCKERHUB_TOKEN 

Docker Hub Token

Profile -> Account Settings -> Security -> New Access token.

Dockerfile

FROM openjdk:17-alpine
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} app.jar
ENTRYPOINT ["java","-jar","/app.jar"]

Spring boot with maven  and Docker Configuration:

name: Publish Docker Image

on:
  push:
    branches: [ "master" ]
  pull_request:
    branches: [ "master" ]

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Set up JDK 17
        uses: actions/setup-java@v2
        with:
          java-version: '17'
          distribution: 'adopt'
          cache: maven
      - name: Build with Maven
        run: mvn -B package --file pom.xml
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      - name: Login to DockerHub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      - name: Build and push
        id: docker_build
        uses: docker/build-push-action@v2
        with:
          context: .    
          push: true
          tags: dockerhubuser/dockerHubRepository:${{github.run_number}}

Running the Workflow

Source Code

Here on Github.

References:

https://www.youtube.com/watch?v=R8_veQiYBjI

https://github.com/docker/build-push-action

https://github.com/actions

https://docs.github.com/en/actions/learn-github-actions/understanding-github-actions

https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions

https://medium.com/@mamthamalar/ci-with-github-actions-publish-docker-images-de8f1f610fac