# Day 21 Task: Docker Important interview Questions.

## **Docker Interview**

Docker is a good topic to ask in DevOps Engineer Interviews, mostly for freshers. One must surely try these questions in order to be better in Docker

## **Questions**

* What is the Difference between an Image, Container and Engine?
    
* What is the Difference between the Docker command COPY vs ADD?
    
* What is the Difference between the Docker command CMD vs RUN?
    
* How Will you reduce the size of the Docker image?
    
* Why and when to use Docker?
    
* Explain the Docker components and how they interact with each other.
    
* Explain the terminology: Docker Compose, Docker File, Docker Image, Docker Container?
    
* In what real scenarios have you used Docker?
    
* Docker vs Hypervisor?
    
* What are the advantages and disadvantages of using docker?
    
* What is a Docker namespace?
    
* What is a Docker registry?
    
* What is an entry point?
    
* How to implement CI/CD in Docker?
    
* Will data on the container be lost when the docker container exits?
    
* What is a Docker swarm?
    
* What are the docker commands for the following:
    
    * view running containers
        
    * command to run the container under a specific name
        
    * command to export a docker
        
    * command to import an already existing docker image
        
    * commands to delete a container
        
    * command to remove all stopped containers, unused networks, build caches, and dangling images?
        
* What are the common docker practices to reduce the size of Docker Image?