DOCKER INTERVIEW QUESTIONS AND ANSWERS – WHAT IS DOCKER

 

Docker Interview Questions And Answers: Explained

Docker, which was kicked off in 2013, got a boom in the IT industry by the end of 2017. In 2017, there was an exponential rise in the downloading of container image rates. With an increase in demand, it increased its recruitments subsequently. The employment rate got a strike, and the new job openings brought scopes for a better career. To crack the job and work with Docker, you need to pass the interview. And to pass the Docker interview questions and answers is definitely not a game of words. To make you achieve your goal with ease, we have listed down a few important Docker Interview questions and answers. So, here are the top interview questions that will help you out.

The Docker interview questions consist of a good rational question pattern. Starting from basics to advanced questions, the interviewer will test your ability and caliber to pass this by gradually advancing the level of the Docker Interview Questions. Usually, the interviewer goes from the basic level of the questions and then move towards the advanced one. Here are the Docker Interview Questions –

 Docker Interview Questions and answers– let's get started

 

 Docker Interview Questions

• What is Docker?

Answers. It is a tool of intermodal freight transfer port that uses ISO containers to pack applications and the dependencies together. It packs them in the form of containers and also ensures that your application is working effectively. The efficiency remains seamless in production or development or test or environment. The container covers software in a file system consisting of code, system tools, personalization, system library, run time, and other essentials that are required to run them. Along with that, it stores the capacity to wrap anything installed on the server.

 

Docker Interview Questions-  Part 1

• List some important features of Docker.

 

Answers:

• It has amazing operational efficiency.
• The best part is its easy modeling.
• It has good developer productivity 
• Affinity rate 

 

• What is Docker Container?

Answers. One of the critical questions related to Docker. It’s an ISO container that is used to pack the applications with the dependency. Container covers software in a file system that contains tools, code, etc. this Container can work in any computer or environment, in any infrastructure, in any cloud. It shares computing with other containers. Then it runs under an isolated process. This is done on the host OS in the userspace. It is formed by units of images.

 

• What are the states in which a Docker container is found to be?

Answers;

1. Running
2. Paused
3. Restarting 
4. Existed

 

• What is Docker image? 

 

Answers. The image is the building unit or source of the Docker container. These images can be brought into play in any Docker environment.

 

• What is Docker hub?

 

The images compile to create a Docker container. The registry where images live is called a hub. It is one of the largest public storehouses of image containers. Users are able to pick images and create their own containers and customized images.

 

• What do you mean by Hypervisor? 

 

Answers:  That is a regular one in Docker Interview questions when it comes to the Docker Interview. The hypervisor is software that enables Virtualization, and hence, it is also known as Virtual Machine Monitor. It allows the host system and then assigns its resources as required to each virtual segment. On a single host system, we can have multiple Operating Systems. 

Further, we have two kinds of Hypervisor 

 

1.  Native Hypervisor 

 

2. Hosted Hypervisor 

 

Native Hypervisor: This Hypervisor is also known as a Bare-metal Hypervisor. It works directly on the basal host system. So, it doesn’t need a base server OS.

Hosted Hypervisor: This Hypervisor computes the underlying host system. So, it is known as Hosted Hypervisor.

 

• What do you mean by Virtualization?

 

Answers: This Question has great potential in the Docker Interview. The process of developing a software-based virtual environment such as servers, applications, etc. is called Virtualization. In Virtualization, these virtual versions are formed of one physical hardware system. By using a software called Hypervisor, one system is splitter into many different sections. After splitting, each section works distinctly. This is done through Virtualization. The virtual version formed using hypervisor is known as a Virtual Machine. 

 

• What do you mean by containerization?

 

Answers: While developing software on one machine, there are possibilities of malfunction of the code developed in one computer. The code might not work properly, and then, to solve this problem, the containerization concept is used. An application that is developed and stuffed into a bundle with its configuration files and dependencies into a container. The container enabled will form a bug-free environment with any configurations and libraries bundled together. It is one of the best and famous containerization environment.

 

Docker Interview Questions can also include differences and comparisons. You need to answers \each of the questions wisely to shine in front of the interviewers.

 

• List the differences between Virtualization and containerization.

Answers: This can be an assured question in your interview. You need to answers on point and impress the interviewers with your knowledge.

Containers give an environment to run the application where the complete user space is extremely dedicated to the application. Every container functions distinctly. Even if changes are made in the container, it will never have an impact on the host or other distinctive working containers running under the same host. 

While, during Virtualization, a software called Hypervisor provides a virtual machine entirely to the guest

Each virtual machine is a physical machine, while each container is a different application.

Containers are extraction of the application layer, while virtual machines are extraction of the hardware layer.

 

• What is  Docker Architecture?

 

Answers. Docker Architecture has Docker Engine. It is a client-server application. This is one of the major questions that is regularly asked in the Interviews.

 

The major components of the Docker Engine are : 

• The server that is a long-running program called a daemon process
• REST API with coded programs that are used to interact with the daemon and instruct it what and when to do
• CLI – Command Line Interface client
• The Command Line Interface (CLI) uses Docker REST API to control and talk to Docker daemon by scripting, or direct Command Line Interface (CLI) commands. Many more Docker applications use REST API and CLI direct command.

 

• What does CNM stand for?

Answers. CNM is the abbreviation for Container Networking Model. It is the basis of container networking in the Docker version. You can answers this kind of Questions, in a small a contained sentence.

 

• What is Docker file?

Answers. It is known as the file that provides an introduction to Docker to form images by reading that information. This file is basically said to be a text document. It consists of all commands that a user would use on the command line to form an image. Users can create an automated build known as Docker build. This can execute different command-line instructions.

• What do you mean by Docker compose?

 

Answers. A -compose is a YAML file. It consists of crude details about services, networks, etc. This is used to set up the applications. By using this compose, one can create a distinct container and host them to get them so that they can communicate with each other. Each container has a port. This port is used to communicate with other containers.

 

• What is Docker Namespace?

Answers. In containers, the namespace adds an isolation layer. It is a Linux feature. To safeguard the underlying host system and make it portable, it provides many namespaces. PID, IPC, Mount, User, Network are the names of a few Namespace supported by Docker.

 

• State the lifecycle of a Docker Container.

 

1. Creation of a container 
2. Running of the container 
3. Pause the container 
4. Un-pause the container. If paused
5. Starting of the container
6. Stopping the container 
7. Restart the container 
8. Kill the container 
9. Finally, the destruction of the container 

 

• What is Docker Machine?

 

Answers. A tool that enables the user to install Docker Engine is called its Machine. This installation is done on a virtual host. These virtual hosts can be managed using commands from the machine. This machine also allows the provision of Swarm Clusters.

 

• What do you mean by the client? Continue Reading..