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Powering a build pipeline with Docker and Jenkins

Powering a build pipeline with Docker and Jenkins

Continuous Delivery is key to delivering software fast and frequently. Jenkins 2 has made great strides in providing a solution for modeling a build pipeline as code. In addition, Docker invoked from a Gradle build can help with implementing certain aspects of your pipeline. Let's combine the benefits of these tools to implement a streamlined and bullet-proof process.

In this demo-driven talk, you will learn how to construct and operate a declarative pipeline with Jenkins. We'll take a Spring Boot application all the way through the pipeline from building the Docker image, pushing the image to a registry, using it for integration testing and finally deploying the application to a Docker Swarm.

Benjamin Muschko

October 26, 2018
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  1. Agenda Typical Continuous Delivery uses cases How can Docker help?

    Show me some code! The glue as code in Jenkins
  2. Dockerfile for Spring Boot app FROM openjdk:jre-alpine
 COPY todo-webservice-1.0.jar \

    /app/todo-webservice-1.0.jar
 ENTRYPOINT ["java"]
 CMD ["-jar", "/app/todo-webservice-1.0.jar"]
 HEALTHCHECK CMD wget --quiet --tries=1 --spider \ http://localhost:8080/actuator/health || exit 1
 EXPOSE 8080
  3. Building and running image # Build image from Dockerfile
 docker

    build -t my-todo-web-service:1.0.0 .
 
 # Run built image in container
 docker run -d -p 8080:8080 my-todo-web-service:1.0.0
  4. Building the image plugins {
 id 'java'
 id 'org.springframework.boot' version

    '2.0.6.RELEASE'
 id 'com.bmuschko.docker-java-application' version '4.0.1'
 } $ ./gradlew dockerBuildImage
  5. Providing a health check dockerCreateDockerfile {
 instruction 'HEALTHCHECK CMD wget

    --quiet --tries=1 \ --spider http://localhost:8080/actuator/health || exit 1'
 }
  6. Pushing image # Log into Docker Hub
 docker login --username=bmuschko

    \ [email protected]
 
 # Tag the image
 docker tag bb38976d03cf bmuschko/todo-web-service:1.0.0
 
 # Push image to Docker registry
 docker push bmuschko/todo-web-service
  7. Pushing the image to Docker Hub docker {
 registryCredentials {


    username = 'bmuschko'
 password = System.getenv('DOCKER_PASSWORD')
 email = '[email protected]'
 }
 springBootApplication {
 tag = 'bmuschko/todo-web-service'
 }
 } $ ./gradlew dockerPushImage
  8. Pull image and start/stop container # Pull image from Docker

    registry
 docker pull bmuschko/todo-web-service:latest
 
 # Start container
 docker run -d -p 8080:8080 -name todo-web-service \ my-todo-web-service:latest
 
 # Stop container
 docker container stop todo-web-service
 
 # Remove container
 docker container rm todo-web-service
  9. Using container for tests task createContainer(type: DockerCreateContainer) {
 dependsOn dockerBuildImage


    targetImageId dockerBuildImage.imageId
 portBindings = ['8080:8080']
 autoRemove = true
 }
 
 task startContainer(type: DockerStartContainer) {
 dependsOn createContainer
 targetContainerId createContainer.containerId
 }
 
 task startAndWaitOnHealthyContainer(type: DockerWaitHealthyContainer) {
 dependsOn startContainer
 timeout = 60
 targetContainerId createContainer.containerId
 }
 
 task stopContainer(type: DockerStopContainer) {
 targetContainerId createContainer.containerId
 }
 
 functionalTest {
 dependsOn startAndWaitOnHealthyContainer
 finalizedBy stopContainer
 } $ ./gradlew functionalTest
  10. Functional test with JUnit 5 public class ToDoWebServiceFunctionalTest {
 @Test


    @DisplayName("can retrieve all items before and after inserting new ones")
 void retrieveAllItems() {
 String allItems = getAllItems();
 assertEquals("[]", allItems);
 
 ToDoItem toDoItem = new ToDoItem();
 toDoItem.setName("Buy milk");
 toDoItem.setCompleted(false);
 insertItem(toDoItem);
 
 allItems = getAllItems();
 assertEquals("[{\"id\":1,\"name\":\"Buy milk\",\"completed\":false}]", allItems);
 } } HTTP calls to running container
  11. Docker Compose definition version: "3.7"
 services:
 web-service: ...
 database: ...


    networks:
 todo-net:
 
 volumes:
 todo-vol: web-service:
 image: "bmuschko/todo-web-service:latest"
 environment:
 - SPRING_PROFILES_ACTIVE=dev
 ports:
 - 8080:8080
 networks:
 - todo-net
 volumes:
 - type: volume
 source: todo-vol
 target: /code
 depends_on:
 - database
 healthcheck:
 test: wget --quiet --tries=1 --spider \ http://localhost:8080/actuator/health || exit 1
 interval: 10s
 timeout: 5s
 retries: 3
  12. Running a multi-container app # Start composed apps
 docker-compose up


    
 # Stop composed apps
 docker-compose down
  13. Using container for tests plugins {
 id 'com.avast.gradle.docker-compose' version '0.8.8'


    }
 
 dockerCompose {
 useComposeFiles = ['docker-compose.yml']
 isRequiredBy(project.tasks.integrationTest)
 exposeAsSystemProperties(project.tasks.integrationTest)
 } $ ./gradlew integrationTest
  14. Integration test with JUnit 5 @ExtendWith(SpringExtension.class)
 @SpringBootTest
 public class ToDoServiceImplIntegrationTest

    {
 @Autowired
 private ToDoService toDoService;
 
 @Test
 public void canCreateNewItemAndRetrieveIt() {
 ToDoItem newItem = newItem("Buy milk");
 assertNull(newItem.getId());
 toDoService.save(newItem);
 assertNotNull(newItem.getId());
 ToDoItem retrievedItem = toDoService.findOne(newItem.getId());
 assertEquals(newItem, retrievedItem);
 } } Calls web service endpoint
  15. Rolling out services to Swarm # Create a new service


    docker service create --name todo-web-service \ --publish 8080:8080 --replicas 5 --secret db-password \ --env SPRING_PROFILES_ACTIVE=prod \ bmuschko/todo-web-service:latest
 
 # Update an existing service from Swarm Leader
 docker service update --image \ bmuschko/todo-web-service:latest todo-web-service
  16. Creating a Docker secret # Login into Swarm Leader
 ssh

    swarm1 
 # Create a password
 printf "prodpwd" | docker secret create db-password -
  17. Calling Gradle from stages pipeline { stages { stage('Compile &

    Unit Tests') { steps { gradlew('clean', 'test') } } } ... } def gradlew(String... args) { sh "./gradlew ${args.join(' ')} -s" }
  18. Injecting credentials & env vars stage('Push Image') { environment {

    DOCKER_USERNAME = "${env.DOCKER_USERNAME}" DOCKER_PASSWORD = credentials('DOCKER_PASSWORD') DOCKER_EMAIL = "${env.DOCKER_EMAIL}" } steps { gradlew('dockerPushImage') } }
  19. Manual deployment to Swarm stage('Deploy to Production') { steps {

    timeout(time: 1, unit: 'DAYS') { input 'Deploy to Production?' } sshagent(credentials: ['ee8346e0-a000-4496-88aa-49977fd97154']) { sh "ssh -o StrictHostKeyChecking=no \ ${env.DOCKER_SWARM_MANAGER_USERNAME}@${env.DOCKER_SWARM_MANAGER_IP} \ docker service update --image bmuschko/todo-web-service:latest \ todo-web-service" } } }