Docker MCQs – Docker and CI/CD

Docker plays a pivotal role in Continuous Integration and Continuous Deployment (CI/CD) pipelines, streamlining the software development lifecycle by enabling consistent, reliable, and fast deployments. Docker makes sure apps work the same way in development, testing, and production. Knowing how Docker works with CI/CD tools like Jenkins, GitLab CI/CD, and GitHub Actions is crucial for DevOps job interviews. This topic will help you understand how Docker makes CI/CD workflows easier.

1.) How does Docker simplify CI/CD pipelines?

A) By eliminating the need for orchestration tools
B) By replacing version control systems
C) By reducing the need for code reviews
D) By providing consistent environments for development, testing, and production

Answer: Option D

Explanation: Docker ensures that applications run consistently across different stages of development, reducing the “works on my machine” problem.

2.) Which of the following is a common tool for implementing CI/CD pipelines with Docker?

A) Jenkins
B) Kubernetes
C) Terraform
D) Docker Compose

Answer: Option A

Explanation: Jenkins is a popular tool for implementing CI/CD pipelines, and it integrates seamlessly with Docker.

3.) What is the primary benefit of using Docker in CI/CD?

A) Eliminates testing phases
B) Automatic code generation
C) Faster deployment cycles
D) Reduces the size of source code

Answer: Option C

Explanation: Docker containers enable faster deployment cycles by ensuring that environments are consistent and isolated.

4.) Which command is commonly used to build a Docker image in a CI/CD pipeline?

A) docker run
B) docker build
C) docker pull
D) docker ps

Answer: Option B

Explanation: The docker build command is used to create Docker images from a Dockerfile in CI/CD pipelines.

5.) What does the term “containerized CI/CD” mean?

A) Running CI/CD processes inside Docker containers
B) Automating code commits
C) Deploying containers without testing
D) Avoiding orchestration tools

Answer: Option A

Explanation: Containerized CI/CD means running CI/CD tools and processes within Docker containers for consistency and isolation.

6.) In a CI/CD pipeline, what is the purpose of the docker push command?

A) To run a container
B) To build a Docker image
C) To upload a Docker image to a container registry
D) To stop a running container

Answer: Option C

Explanation: The docker push command uploads Docker images to a registry, such as Docker Hub or a private registry.

7.) What does the docker-compose up command do in a CI/CD process?

A) Builds Docker images only
B) Starts and runs all services defined in a Compose file
C) Pulls images from the Docker registry
D) Stops all running containers

Answer: Option B

Explanation: The docker-compose up command starts and runs all services defined in a docker-compose.yml file, simplifying multi-container setups in CI/CD pipelines.

8.) What is the purpose of a Docker registry in a CI/CD workflow?

A) To orchestrate containers
B) To manage container networking
C) To monitor container logs
D) To store and distribute Docker images

Answer: Option D

Explanation: A Docker registry stores and distributes Docker images, which can then be used in CI/CD pipelines.

9.) Which command is used to pull a Docker image in a CI/CD pipeline?

A) docker build
B) docker pull
C) docker run
D) docker create

Answer: Option B

Explanation: The docker pull command retrieves a Docker image from a registry for use in CI/CD pipelines.

10.) What does the .dockerignore file do in a CI/CD process?

A) Automates deployment of containers
B) Lists the dependencies of the application
C) Specifies the image version to be used
D) Excludes files and directories from being added to a Docker image

Answer: Option D

Explanation: The .dockerignore file excludes unnecessary files and directories from being included in the Docker build context.

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