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Top 8 Questions For Docker Interview In 2020

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By Author: Novel Vista
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You can easily conclude, by seeing this huge revenue, companies who haven’t used Docker till now, are thinking of using it as well. So if you already have knowledge about Docker, it will help you to crack your DevOps interview in a better way.
You might be again wondering, what are the Docker questions that you’ll come across in a DevOps interview?
Well, we have picked some for you. Check it out!

1. What is Docker?
Docker is a collection of PaaS software that binds your application and all its dependencies together in containers to make sure that your application works flawlessly in any environment including development, testing, or production.
Docker wraps anything that can be installed on a server as a guarantee that the software will always run the same, regardless of its environment.

2. What is a Docker Container?
Docker containers are made of the application and all of its dependencies. It shares the kernel with other containers while running as isolated processes in the user space of the host operating system. Docker containers are not limited to some specific infrastructure. They run on every operating system, infrastructure, and cloud. Docker containers are practically the runtime instances of Docker images.
3. What are Docker Images?
Docker image is the source of the Docker container. They are the main elements that are used to create containers. When a user runs a Docker image, it creates an instance of a container. Docker images are deployable to any Docker environment.
4. What is Docker Hub?
Docker images create docker containers. The registry where these docker images reside is called Docker Hub. Users can choose images from Docker Hub and use them to create customized containers. At present, the Docker Hub is the world’s largest public repository of image containers.
5. What is a Dockerfile?
A Dockerfile is a text document that delivers all the commands the user could call on the command line to assemble an image. Users can also create an automated build that executes several command-line instructions in succession by using Docker build.
6. Tell us something about Docker Compose.
Docker Compose is a YAML file that contains details about the services, networks, and volumes which are important to set up the Docker application. Docker Compose can be used to create separate containers, host them, and get them to communicate with each other where each container produces a port for communicating with other containers.
7. What is Docker Swarm?
Docker Swarm is native clustering for Docker that turns a pool of Docker hosts into a single, virtual Docker host. It serves the standard Docker API. Swarm can be used by any tool that already communicates with a Docker daemon for the purpose of transparent scaling to multiple hosts.
8. What is a Docker Namespace?
A namespace is an important concept of containers and a Linux feature. Namespace adds a layer of isolation in containers. Docker provides a number of namespaces to stay portable and not to affect the underlying host system Few examples of Namespaces are: PID, Mount, IPC, User, Network

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