Technologies Coding Problems Bookmarks Learning Paths

Technologies Coding Problems Bookmarks Learning Paths

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Questions

1 of 6

1What is a Docker container?

2How is a container different from a virtual machine?

3What are cgroups and how does Docker use them?

4How do you list running containers?

5How do you stop a running container?

6How do you run a container from an image?

Docker

Volumes and Storage

01 / 06

What is a Docker container?

Difficulty: 4/10

isolation, image layering, runtime configuration

Containers are isolated environments for running code. A Docker container is like a box that holds your app and everything it needs to run — no more 'it works on my machine' problems.

A Docker container is a lightweight, standalone, and executable package that includes:

1
Your application code
2
All its dependencies, libraries, binaries
3
And even runtime (like Node.js, Python, etc.)

Scenario Questions

0-2 years experience

1How would you run a simple web app inside a Docker container on your laptop? Walk me through the steps.
2If you build an image, tag it as `myapp:latest`, and then run `docker run myapp`, what happens under the hood?

2-5 years experience

1Your CI pipeline builds a Docker image, but the tests fail only when the container starts. How would you troubleshoot the issue?

Follow-up Questions

Can you give an example of a situation where you had to choose between a slim base image and a more feature‑rich one?
What metrics would you monitor to ensure containers stay healthy in production?
How would you handle secret management for containers in a CI/CD pipeline?

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2We need to reduce the size of our Docker images for faster deployments. What trade‑offs would you consider when choosing a base image and layering?

5-8 years experience

1Our microservice architecture runs hundreds of containers per node. How would you design the container runtime configuration to balance resource isolation and density?
2During a rolling update, some containers start failing due to a mismatch between the host kernel and the container's expectations. How would you detect and mitigate such compatibility problems at scale?

8+ years experience

1We are planning to migrate a legacy monolith that currently runs on VMs to a container‑first platform across multiple data centers. What architectural changes and governance processes would you put in place to ensure a smooth transition?
2How would you design a shared Docker image registry strategy that satisfies security, compliance, and performance requirements for dozens of teams in a large organization?

What is a Docker container? | Container | Docker Interview Questions | NextRound.in