Technologies Coding Problems Bookmarks Learning Paths

Technologies Coding Problems Bookmarks Learning Paths

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Questions

4 of 11

1You need to deploy a Node.js application that uses a MongoDB database and a Redis cache. How would you set this up using Docker Compose?

2What's the difference between Docker Compose and Docker Swarm?

3How do you manage sensitive data like passwords and API keys?

4What problem does Docker Compose solve?

5How do you handle environment-specific configurations (dev, staging, production)?

6How do you scale a service using Docker Compose?

7What are the top-level sections in a docker-compose.yml file, and what does each do? (Demonstrates familiarity with the file's structure.)

8Write a docker-compose.yml file to set up a local development environment for a full-stack application (e.g., a React frontend, a Node.js/Express API, and a PostgreSQL database).

9How would you manage dependencies between services to ensure correct startup order?

10What's the difference between depends_on and links?

11How do you handle persistent storage for databases?

Docker

Volumes and Storage

04 / 11

What problem does Docker Compose solve?

Difficulty: 5/10

multi-container orchestration, service dependencies, environment configuration

Docker Compose solves the problem of running and managing multiple related containers together. With a single YAML file, it helps you define services, networks, and volumes so the entire application (e.g., DB, backend, frontend, cache) can be started, stopped, or reproduced consistently, making it ideal for development and CI workflows

Scenario Questions

0-2 years experience

1You need to run a simple web app that consists of a Python Flask container and a PostgreSQL container for a coding assignment. How would you set up Docker Compose for this, and what files would you create?
2If you execute `docker-compose up` and the database container fails to start, what steps would you take to troubleshoot the problem?
3After adding a new cache service to an existing docker‑compose.yml, you run `docker-compose up` again. What does Docker Compose do with the already‑running containers?

Follow-up Questions

How does Docker Compose differ from writing a series of Docker CLI commands in a script?
What limitations does Docker Compose have when you need to run at scale in production?
When would you choose Kubernetes or another orchestrator over Docker Compose?

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2-5 years experience

1Your team added a new microservice that depends on an existing API service. After updating docker‑compose.yml, the dependent service sometimes starts before its dependency is ready, causing failures. How would you resolve this ordering issue?
2In a CI pipeline, `docker-compose up` is rebuilding images on every run, making the pipeline slow. What strategies could you use to speed up the process while keeping the environment reproducible?
3You notice that environment variables defined under `environment:` in the compose file are not appearing inside the container. What could cause this and how would you fix it?

5-8 years experience

1Your CI system runs dozens of containers via Docker Compose on a shared server, and you’re hitting resource contention and flaky tests. Discuss the scalability and isolation challenges and propose architectural changes or tooling to handle the load more efficiently.
2Explain the trade‑offs of using Docker Compose for local development versus moving to a full orchestrator like Kubernetes for production. How would you design a migration path that preserves developer productivity?
3A legacy monolith is being split into several services, and the team wants to use Docker Compose for integration testing. What patterns would you put in the compose files to manage service versioning, network isolation, and persistent test data across runs?

8+ years experience

1Your organization is migrating from Docker Compose‑based development environments to a unified platform that supports both local development and production orchestration across many teams. What architectural considerations would you evaluate, and how would you design a migration plan that minimizes disruption while keeping the benefits Docker Compose gave you?
2Multiple product teams have diverged Docker Compose configurations, leading to drift and high maintenance overhead. Propose a strategy for standardizing Compose usage, including schema validation, shared base files, and governance, and discuss its impact on cross‑team collaboration.
3When scaling a microservices ecosystem, you need to decide whether to keep Docker Compose for some edge services or adopt a service mesh. How would you assess the decision criteria, and what hybrid approach could you recommend?

What problem does Docker Compose solve? | Compose | Docker Interview Questions | NextRound.in