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Interview Questions & Answers for Docker and Containers

July 24, 2021 comments off

Table of Contents

Container

What is a Container? What is it used for?

How are containers different from virtual machines (VMs)?

In which scenarios would you use containers and in which you would prefer to use VMs?

Explain Podman or Docker architecture

Describe in detail what happens when you run podman/docker run hello-world?

What are dockerd, docker-containerd, docker-runc, docker-containerd-ctr, docker-containerd-shim ?

Describe difference between cgroups and namespaces

Describe in detail what happens when you run docker pull image:tag?

How do you run a container?

What podman commit does?. When will you use it?

How would you transfer data from one container into another?

What happens to data of the container when a container exists?

Explain what each of the following commands do:

  • docker run
  • docker rm
  • docker ps
  • docker pull
  • docker build
  • docker commit

How do you remove old, non running, containers?

Dockerfile

What is Dockerfile

What is the difference between ADD and COPY in Dockerfile?

What is the difference between CMD and RUN in Dockerfile?

Do you perform any checks or testing related to your Dockerfile?

Explain what is Docker compose and what is it used for

Describe the process of using Docker Compose

Explain Docker interlock

Where can you store Docker images?

What is Docker Hub?

What is the difference between Docker Hub and Docker cloud?

What is Docker Repository?

Explain image layers

What best practices are you familiar related to working with containers?

How do you manage persistent storage in Docker?

How can you connect from the inside of your container to the localhost of your host, where the container runs?

How do you copy files from Docker container to the host and vice versa?

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