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Basics of Docker
- What is Docker, and what problems does it solve?
- Explain the difference between a Docker container and a virtual machine.
- What is Docker Hub, and how is it used?
- How does Docker handle containerization?
- What are the key components of Docker architecture?
- Describe the role of a Dockerfile.
- How do you create a Docker image from a Dockerfile?
- What is the purpose of the
docker run command? - How do you list all running Docker containers?
- Explain the difference between
docker ps and docker ps -a.
Docker Images and Containers
- What is the Docker image lifecycle?
- How do you remove a Docker image?
- What are Docker container volumes, and how do they differ from Docker container bind mounts?
- How do you create and use Docker volumes?
- What is the purpose of Docker tags?
- How do you manage Docker container networking?
- Explain how to build a Docker image using a multi-stage build.
- How do you inspect the contents of a Docker image?
- What is the difference between
COPY and ADD in a Dockerfile? - How do you update an existing Docker image?
Docker Networking
- What are the different Docker network types (bridge, host, overlay)?
- How do you create a custom Docker network?
- Explain the concept of Docker network aliases.
- How do you troubleshoot network issues within Docker containers?
- What is the role of Docker Compose in managing multi-container applications?
- How do you connect Docker containers to an external network?
- What are Docker network drivers, and how do they work?
- How do you use Docker networking to link containers?
- Explain the concept of network isolation in Docker.
- How do you expose Docker container ports to the host system?
Docker Compose
- What is Docker Compose, and why is it used?
- How do you define services in a
docker-compose.yml file? - What are the key components of a
docker-compose.yml file? - How do you scale services using Docker Compose?
- How do you manage environment variables with Docker Compose?
- Explain how to use Docker Compose for a development environment.
- What is the purpose of the
docker-compose up command? - How do you define build contexts in Docker Compose?
- What are Docker Compose overrides, and how do you use them?
- How do you use Docker Compose to manage persistent data?
Docker Swarm and Kubernetes
- What is Docker Swarm, and how does it compare to Kubernetes?
- How do you initialize a Docker Swarm cluster?
- Explain the role of a Docker Swarm manager and worker node.
- What are Docker Swarm services, and how do you create them?
- How do you update a Docker Swarm service?
- What is the purpose of Docker Swarm stack files?
- Describe how Docker Swarm handles service scaling and load balancing.
- How do you perform a rolling update in Docker Swarm?
- What is Kubernetes, and how does it relate to Docker?
- How do you deploy a Docker container to a Kubernetes cluster?
Docker Security
- What are best practices for securing Docker containers?
- How do you manage Docker container secrets and environment variables securely?
- What is Docker Content Trust, and how is it used?
- Explain the role of Docker security scanning tools.
- How do you use Docker Bench for Security?
- What are some common vulnerabilities in Docker containers?
- How do you harden Docker daemon configurations?
- What is the principle of least privilege in Docker container security?
- How do you secure Docker images?
- What is the purpose of Docker’s user namespace support?
Docker Performance and Optimization
- How do you optimize Docker image build times?
- What are Docker image layers, and how do they impact performance?
- How do you reduce the size of Docker images?
- What is Docker’s storage driver, and how does it affect performance?
- How do you monitor Docker container performance?
- What tools can you use to analyze Docker container performance?
- How do you troubleshoot Docker container performance issues?
- What are the best practices for optimizing Docker container startup times?
- How do you manage and clean up unused Docker images and containers?
- What are the implications of using different Docker storage drivers?
Advanced Docker Usage
- How do you handle logging in Docker containers?
- What is Docker Healthcheck, and how do you use it?
- How do you integrate Docker with CI/CD pipelines?
- Explain the concept of Docker container orchestration.
- How do you use Docker for building and testing applications?
- What is Docker Machine, and how is it used?
- How do you manage Docker container lifecycle events?
- What are Docker plugins, and how can they be used?
- How do you use Docker for local development environments?
- What is the role of Docker Daemon, and how do you configure it?
Troubleshooting and Maintenance
- How do you diagnose and fix issues with Docker containers?
- What steps do you take to recover from a Docker container crash?
- How do you perform a system-wide Docker cleanup?
- How do you handle Docker container logs?
- What is Docker’s approach to backup and restore operations?
- How do you troubleshoot Docker networking issues?
- What are common Docker errors, and how do you resolve them?
- How do you update Docker to a new version?
- What are Docker’s health check mechanisms, and how do they work?
- How do you handle Docker container data persistence?
Real-World Scenarios
- Can you describe a situation where Docker significantly improved a project?
- How do you handle multi-environment deployments using Docker?
- What challenges have you faced with Docker in production, and how did you overcome them?
- How do you approach Dockerizing legacy applications?
- Explain a scenario where you had to optimize Docker container performance.
- What strategies do you use for managing Docker in a large-scale environment?
- How do you manage Docker container dependencies?
- Describe a situation where Docker Compose was particularly useful.
- How do you handle Docker container security updates in production?
- What are your best practices for Docker image versioning and tagging?
