Building Docker images in pipeline in Jenkins - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of building Docker images in a Jenkins pipeline?

Building Docker images in a Jenkins pipeline automates the creation of container images from your application code, ensuring consistent and repeatable builds for deployment.

beginner

Which Jenkins plugin is commonly used to interact with Docker during pipeline execution?

The 'Docker Pipeline' plugin allows Jenkins pipelines to build, run, and manage Docker containers and images.

beginner

What is the basic Jenkins pipeline syntax to build a Docker image named 'myapp' with tag 'v1'?

docker.build('myapp:v1')

intermediate

Why should you use a Jenkins agent with Docker installed when building Docker images in a pipeline?

Because Docker commands require the Docker engine, the Jenkins agent must have Docker installed to build and manage images during the pipeline run.

intermediate

How can you push a Docker image to a registry within a Jenkins pipeline after building it?

After building the image, use the 'docker.withRegistry' block to authenticate and then call 'image.push()' to upload the image to the registry.

Which Jenkins pipeline step builds a Docker image?

A docker.build()

B docker.run()

C docker.push()

D docker.pull()

The 'docker.build()' step creates a Docker image from a Dockerfile.

What must be installed on the Jenkins agent to build Docker images?

A Maven

B Docker engine

C Git

D Kubernetes

Docker engine is required to run Docker commands like building images.

How do you tag a Docker image as 'latest' in Jenkins pipeline?

A docker.build('myimage:latest')

B docker.build('myimage')

C docker.tag('latest')

D docker.push('latest')

Tagging is done by specifying the tag in the build step like 'myimage:latest'.

Which block helps authenticate to a Docker registry in Jenkins pipeline?

A docker.connect()

B docker.login()

C docker.authenticate()

D docker.withRegistry()

'docker.withRegistry()' wraps steps that require registry authentication.

What is the main benefit of building Docker images in a pipeline?

A Removes the need for Dockerfiles

B Runs containers faster

C Automates and standardizes image creation

D Avoids using version control

Pipelines automate and standardize the image build process for consistency.

Explain the steps to build and push a Docker image in a Jenkins pipeline.

Think about building, logging in, and pushing.

Why is it important to have Docker installed on the Jenkins agent when building images?

Consider what runs the Docker commands.