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What is Docker?
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Docker interview questions.
Only challenges
- 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 âdocker killâ or âdocker rm -fâ?
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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 âdocker runâ and âdocker createâ?
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- 9.
What is the difference between CMD and ENTRYPOINT in a Dockerfile?
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- 10.
Whatâs 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 (âdocker rmâ) 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?
Answer:
- 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?
Answer:
- 21.
What is virtualisation?
Answer:
- 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 âDockerized nodeâ? 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?
Answer:
- 30.
What is the difference between CMD and ENTRYPOINT in a Dockerfile?
Answer:
- 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 - âdocker rm -fâ or âdocker stopâ then followed by a âdocker rmâ?
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- 34.
What is the difference between âexposeâ and âpublishâ 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?
Answer:
- 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?
Answer:
- 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?
Answer:
- 51.
How does Docker run containers in non-Linux systems?
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- 52.
How containers works at low level?
Answer:
- 53.
Name some limitations of containers vs VM
Answer:
- 54.
Why did Docker jump from version 1.13 to 17.03?
Answer:
- 55.
How to use Docker with multiple environments?
Answer:
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