Docker Pipeline plugin in Jenkins - Mini Project: Build & Apply

Build and Push Docker Image Using Jenkins Docker Pipeline Plugin

📖 Scenario: You are working as a DevOps engineer. Your team wants to automate building and pushing Docker images using Jenkins. You will create a Jenkins pipeline script that uses the Docker Pipeline plugin to build a Docker image from a Dockerfile and push it to Docker Hub.

🎯 Goal: Build a Jenkins pipeline script that builds a Docker image named myapp with tag v1 from the current directory, then pushes it to Docker Hub repository yourdockerhubid/myapp:v1.

📋 What You'll Learn

Create a Docker image named myapp with tag v1 using the Docker Pipeline plugin

Use a variable dockerImage to hold the image object

Push the image to Docker Hub repository yourdockerhubid/myapp:v1

Print a message confirming the image push

💡 Why This Matters

🌍 Real World

Automating Docker image builds and pushes in Jenkins pipelines is common in continuous integration and continuous delivery (CI/CD) workflows.

💼 Career

DevOps engineers and automation specialists use Docker Pipeline plugin in Jenkins to streamline container image management and deployment.

1

Create Docker image variable

Create a variable called dockerImage that builds a Docker image named myapp:v1 from the current directory using docker.build.

Jenkins

# Your code here

Need a hint?

Use docker.build('myapp:v1') to build the image and assign it to dockerImage.

2

Add Docker Hub repository variable

Create a variable called dockerRepo and set it to the string 'yourdockerhubid/myapp:v1' to specify the Docker Hub repository and tag.

Jenkins

dockerImage = docker.build('myapp:v1')
# Your code here

Need a hint?

Assign the exact string 'yourdockerhubid/myapp:v1' to dockerRepo.

3

Tag and push Docker image

Use the dockerImage variable to tag the image with dockerRepo and push it to Docker Hub using dockerImage.push().

Jenkins

dockerImage = docker.build('myapp:v1')
dockerRepo = 'yourdockerhubid/myapp:v1'
# Your code here

Need a hint?

Use dockerImage.tag(dockerRepo) to tag and dockerImage.push() to push the image.

4

Print confirmation message

Print the message "Docker image pushed to yourdockerhubid/myapp:v1" using echo.

Jenkins

dockerImage = docker.build('myapp:v1')
dockerRepo = 'yourdockerhubid/myapp:v1'
dockerImage.tag(dockerRepo)
dockerImage.push()
# Your code here

Need a hint?

Use echo "Docker image pushed to yourdockerhubid/myapp:v1" to print the confirmation.