Docker Interview Questions and Answers

Last updated on Feb 06, 2023
  • Share
Docker Interview Questions

Docker hit the IT industry and enterprises in the year 2013. By the end of last year, it almost hit 10 billion container images and so is the demand for Docker and its professionals are increasing enormously. This has also resulted in an exponential rise in job openings for the same. If you want to be on top of the pre-race preparation in Docker software it is advisable to go through the advanced set of Docker interview questions. These will not only assure success whether you will achieve a supreme position amongst other competitors. So go ahead and take advantage of the below-mentioned question and answers set.

Most significant features of Docker from other competitive technologies are-

  • The Docker container can be run on PC as well as the company's or Enterprise's IT system.
  • As Docker is a repository of containers it can be deployed and downloaded on all the applications from a centralized location
  • The applications can be shared actively with all the containers that were created earlier.

Most Frequently Asked Docker Interview Questions

Here in this article, we will be listing frequently asked Docker Interview Questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

Q1. What do you understand by ‘Hypervisor’?

Hypervisor refers to software which has a tendency to make virtualizations possible and it is also known as virtual machine monitor. The hypervisor also segments the host system by allocating the resources to the individual virtual environment. With this utility, the user can have various operating systems on a single host system.

Type of hypervisors are-
  • Type 1: It is known as a native hypervisor or bare-metal hypervisor which runs directly under the host system.
  • Type 2: It utilizes the underlying host operating system it is also known as a hosted hypervisor.
Q2. What do you understand by Docker?

Note: As we are going through Docker interview questions and answers it is very important to have a brief over what is Docker.

Docker presents a containerization platform packaging applications along with its dependencies together in a container form. It is yours that the applications work seamlessly under any environment (no matter if it is a test, development of production). The Docker containers wrap the piece of software in an entire file system containing the essentials like code, runtime, system libraries, system tools and many more. It also wraps everything which is installed on a server guaranteeing its run time regardless of the environment.

Q3. What is the life cycle of a Docker?
The lifecycle of a Docker is as follows-
  • Create a container
  • Run the Docker container
  • Pause container
  • Unpause container
  • Start container
  • Stop container
  • Restart container
  • Kill container
  • Destroy container
Q4. Can you explain the Docker container?

The application and its dependencies are included in Docker containers. It can also share the kernel with various other containers running on individual processes in user space on any of the host operating systems. These containers are not bound to any defined specific infrastructure or any computer or infrastructure. They are compatible with the cloud and runtime instances of images.

Q5. Explain in brief what are Docker images?

A docker image is the fundamental source of Docker container it is better to say that they are used to create the Docker containers. When the user runs these images corresponding instance for the container is developed automatically in it. These images can be used for any other Docker environment as well.

Q6. Explain the concept of virtualization?

Virtualization is a process of creating the virtual session of computer storage, service or applications which are software-based. This virtual environment is created from a single segment of the physical hardware system and through it, you can split one system into various other sections acting like a separate and distinguishable system. With the help of hypervisor, this splitting is executable and the virtual session created by this medium is known as a virtual machine.

Q7. Explain the constituents of Docker architecture?

The Docker architecture majorly consists of an engine which refers to a client-server application having three major components, these components are-

  • A server which represents the long-running program type known as a daemon process (Docker command)
  • A REST API which defines the interface used in the program to talk to the daemon and then follow the instructions
  • A command-line interface client
  • CLI utilizes the Docker REST API to organize or control Damon with scripting or direct commands.
Q8. Provide a brief note for Docker Hub.

It is justified in Docker that the containers are made up of Docker images. These Docker images are defined in a separate registry which is known as Docker Hub. From this defined registry it is easy for the users to pick images and use them to create containers and customized images. At present Docker Hub is the world's largest public repository for image containers.

Q9. Explain what are Docker objects and namespaces?

Docker objects: The Docker objects refer to the Docker images, containers and services. A Docker image is a read-only template having the configuration and runtime instructions for Docker instructions. Under the service instruction scaling of the containers across multiple Docker, daemons are allowed. All this together works as Swarm.

Docker namespaces: It refers to a technology that provides individual and isolated workspaces known as containers. Docker namespaces also provide a layer of isolation for containers.

Q10. Can you name a few of the important commands in Docker?

The most important commands in Docker are-

  • Docker- It is used to launch the Docker daemon
  • Build- It is used to build image files in Docker
  • Create- It is used to create a new container
  • Kill- It is used to kill the container
  • Commit- It is used to create a new image from the container modifications.

It is no longer difficult to fulfill your passion being in Docker software with the help of best Docker interview questions and answers. As they will completely assist you by providing the knowledge and specifications of the field. The set of questions and answers are also provided in an organized way considering the levels and increasing the chances of your selection.

Reviewed and verified by Best Interview Question
Best Interview Question

With our 10+ experience in PHP, MySQL, React, Python & more our technical consulting firm has received the privilege of working with top projects, 100 and still counting. Our team of 25+ is skilled in...