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Docker interview questions

Docker interview questions.

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  • 1.

    What is Docker?

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  • 2.

    What is the difference between a Docker image and a container?

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  • 3.

    What is the difference between the COPY and ADD commands in a Dockerfile?

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  • 4.

    What is Docker hub?

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  • 5.

    What are the various states that a Docker container can be in at any given point in time?

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  • 6.

    When would you use ‘docker kill’ or ‘docker rm -f’?

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  • 7.

    Is there a way to identify the status of a Docker container?

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  • 8.

    What is the difference between ‘docker run’ and ‘docker create’?

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  • 9.

    What is the difference between CMD and ENTRYPOINT in a Dockerfile?

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  • 10.

    What’s the difference between a repository and a registry?

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  • 11.

    Do I lose my data when the Docker container exits?

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  • 12.

    Can you remove (‘docker rm’) a container that is paused?

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  • 13.

    What is Build Cache in Docker?

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  • 14.

    How to build envrionment-agnostic systems with Docker?

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  • 15.

    How to link containers?

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  • 16.

    What type of applications - Stateless or Stateful are more suitable for Docker Container?

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  • 17.

    What is Docker image?

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  • 18.

    What is Docker container?

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  • 19.

    What are the most common instructions in Dockerfile?

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  • 20.

    How do I transfer a Docker image from one machine to another one without using a repository, no matter private or public?

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  • 21.

    What is virtualisation?

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  • 22.

    What happens if you add more than one CMD instruction to a Dockerfile?

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  • 23.

    Can you create containers wihout their own PID namespace?

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  • 24.

    How will you monitor Docker in production?

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  • 25.

    What exactly do you mean by “Dockerized node”? Can this node be on-premises or in the cloud?

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  • 26.

    Explain basic Docker usage workflow

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  • 27.

    What is Docker Swarm?

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  • 28.

    What is the difference between Docker Image and Layer?

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  • 29.

    Docker Compose vs. Dockerfile - which is better?

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  • 30.

    What is the difference between CMD and ENTRYPOINT in a Dockerfile?

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  • 31.

    Could you explain what is Emulation?

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  • 32.

    How can we control the startup order of services in Docker compose?

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  • 33.

    What is the preferred way of removing containers - ‘docker rm -f’ or ‘docker stop’ then followed by a ‘docker rm’?

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  • 34.

    What is the difference between “expose” and “publish” in Docker?

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  • 35.

    Should I use Vagrant or Docker for creating an isolated environment?

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  • 36.

    What is the purpose of EXPOSE command in Dockerfile?

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  • 37.

    What is the default CPU limit set for a container?

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  • 38.

    What is Hypervisor?

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  • 39.

    What is the difference between Docker RUN, CMD and ENTRYPOINT?

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  • 40.

    Can you explain dockerfile ONBUILD instruction?

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  • 41.

    What is Paravirtualization?

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  • 42.

    When you limit the memory for a container, does it reserve (guarantee) the memory?

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  • 43.

    What is an orphant volume and how to remove it?

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  • 44.

    How is Docker different from a virtual machine?

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  • 45.

    What are the different kinds of namespaces available in a Container?

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  • 46.

    How virtualization works at low level?

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  • 47.

    Is it possible to generate a Dockerfile from an image?

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  • 48.

    Can you run Docker containers natively on Windows?

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  • 49.

    Is it good practice to run stateful applications on Docker? What are the scenarios where Docker best fits in?

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  • 50.

    Why Docker compose does not wait for a container to be ready before moving on to start next service in dependency order?

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  • 51.

    How does Docker run containers in non-Linux systems?

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  • 52.

    How containers works at low level?

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  • 53.

    Name some limitations of containers vs VM

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  • 54.

    Why did Docker jump from version 1.13 to 17.03?

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  • 55.

    How to use Docker with multiple environments?

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