20 October 2020

#Docker

#Docker

Key Concepts


S.No Topic Sub-Topics
1 Introduction to Docker What is Docker, Containers vs VMs, Docker architecture, Docker use cases, Installation on OS
2 Docker CLI Basics docker --version, docker info, docker help, basic commands, docker run hello-world
3 Docker Images Docker Hub, Pulling images, Listing images, Removing images, Inspecting images
4 Docker Containers docker run, docker ps, docker stop, docker start, docker rm
5 Docker Volumes Creating volumes, Listing volumes, Mounting volumes, Volume management, Persisting data
6 Docker Networks Bridge network, Host network, Overlay network, Creating custom networks, Connecting containers
7 Dockerfile Basics Dockerfile syntax, FROM instruction, RUN instruction, COPY/ADD, CMD vs ENTRYPOINT
8 Building Docker Images docker build, Tagging images, Building from Dockerfile, Contexts, Best practices
9 Container Management docker exec, docker logs, docker attach, Inspect container, Restart policies
10 Docker Compose Basics docker-compose.yml structure, Services, Volumes, Networks, Running multi-container apps
11 Advanced Docker Compose Environment variables, Build vs Image, Depends_on, Scaling services, Compose commands
12 Docker Registry Docker Hub, Private registry, Pushing images, Pulling images, Managing tags
13 Docker Security User permissions, Namespaces, Capabilities, Image scanning, Secrets management
14 Docker Logging Logging drivers, docker logs, Custom logging, Log rotation, Centralized logging
15 Docker Monitoring docker stats, Container metrics, Prometheus integration, cAdvisor, Alerts
16 Docker Storage Bind mounts, Volumes, tmpfs, Storage drivers, Performance considerations
17 Docker Networking Advanced Port mapping, Exposing ports, Network isolation, DNS, Service discovery
18 Multi-stage Docker Builds Reducing image size, Multiple FROM, Cache optimization, Build args, Practical example
19 Docker Environment Variables Passing env vars, .env files, ENV instruction, Secrets vs env vars, Overriding
20 Docker Health Checks HEALTHCHECK instruction, Monitoring container health, Restart policies, Alerts, Practical example
21 Docker Swarm Basics Swarm mode, Nodes, Services, Replicas, Scaling
22 Docker Swarm Advanced Overlay networks, Load balancing, Secrets, Rolling updates, Stack deploy
23 Docker for CI/CD Integrating with Jenkins, GitHub Actions, GitLab CI, Building pipelines, Automated testing
24 Docker Logging & Monitoring Advanced ELK stack, Fluentd, Prometheus + Grafana, Centralized logs, Alerts
25 Docker Performance Tuning Resource limits, CPU & memory, Storage optimization, Networking tuning, Image size optimization
26 Docker Troubleshooting Common errors, Logs analysis, Network issues, Volume issues, Debugging containers
27 Docker Best Practices Small images, Security best practices, Versioning, Labels, Automated builds
28 Docker Integration with Kubernetes Container orchestration, Pods vs Containers, Deployment files, kubectl basics, Docker images in K8s
29 Docker Projects Build a web app container, Multi-container app, CI/CD pipeline, Database + App, Volume persistence
30 Final Project End-to-end project: Dockerized multi-service app, CI/CD integration, Monitoring & logging setup, Deployment, Documentation

Interview question

Basic

  1. What is Docker and why is it used?
  2. Difference between Docker and Virtual Machines?
  3. What is a Docker container?
  4. What is a Docker image?
  5. How do you create a Docker container?
  6. What is the use of docker run command?
  7. What is the difference between docker run and docker start?
  8. How do you list all running Docker containers?
  9. How do you stop a running container?
  10. What is the purpose of the Dockerfile?
  11. Explain the layers in a Docker image.
  12. What is the role of the Docker Engine?
  13. What is a Docker registry?
  14. Difference between Docker Hub and a private registry?
  15. What does the docker ps -a command do?
  16. How do you remove an image in Docker?
  17. How do you delete all stopped containers?
  18. What is the difference between docker exec and docker attach?
  19. How do you check container logs?
  20. Explain the purpose of the .dockerignore file.
  21. How do you build a Docker image from a Dockerfile?
  22. What is the command to pull an image from Docker Hub?
  23. How do you export and import a Docker container?
  24. Explain the difference between COPY and ADD in Dockerfile.
  25. What is the default network driver in Docker?

Intermediate

  1. Explain the concept of Docker volumes.
  2. Difference between bind mounts and volumes?
  3. How do you share data between containers?
  4. How do you persist data in Docker?
  5. What is a multi-stage build in Docker?
  6. Explain Docker networking modes.
  7. Difference between bridge, host, and none networks?
  8. What is Docker Compose?
  9. How do you define services in Docker Compose?
  10. Difference between Docker Compose and Docker Swarm?
  11. How do you scale services in Docker Compose?
  12. How do you pass environment variables into Docker containers?
  13. Explain the purpose of the ENTRYPOINT instruction.
  14. Difference between ENTRYPOINT and CMD?
  15. What is the use of docker inspect command?
  16. How do you check the resource usage of a container?
  17. Explain how Docker handles container isolation.
  18. What is the difference between an image tag and digest?
  19. How do you configure health checks for a container?
  20. Explain the concept of overlay networks.
  21. How do you update a running container?
  22. Difference between restarting and recreating a container?
  23. How do you use Docker secrets?
  24. How do you secure communication between Docker containers?
  25. What are some best practices for writing a Dockerfile?

Advanced

  1. Explain the architecture of Docker.
  2. How does Docker use namespaces and cgroups?
  3. What is the difference between Docker Swarm and Kubernetes?
  4. How do you deploy a Dockerized application in production?
  5. What are Docker service discovery mechanisms?
  6. How does Docker handle inter-container communication?
  7. Explain the concept of service mesh in relation to Docker.
  8. How do you configure resource limits (CPU/memory) for a container?
  9. How do you troubleshoot a container that keeps crashing?
  10. Explain the purpose of Docker overlay storage drivers.
  11. Difference between AUFS, OverlayFS, and Btrfs in Docker?
  12. How does Docker caching work in builds?
  13. How do you optimize Docker images for production?
  14. How do you reduce Docker image size?
  15. Explain the concept of immutable infrastructure with Docker.
  16. How do you migrate containers from one host to another?
  17. How do you integrate Docker with CI/CD pipelines?
  18. How do you implement zero-downtime deployment with Docker?
  19. Explain blue-green deployment using Docker.
  20. What are sidecar containers?
  21. How do you enable TLS for Docker daemon?
  22. What is Docker Content Trust (DCT)?
  23. How do you scan Docker images for vulnerabilities?
  24. How do you manage secrets in Docker Swarm?
  25. How do you use Docker in hybrid cloud environments?

Expert

  1. Explain in detail how Docker uses Union File System.
  2. What are the security risks with Docker containers?
  3. How do you harden Docker containers for security?
  4. What is seccomp in Docker?
  5. Explain AppArmor and SELinux in Docker security.
  6. How do you isolate sensitive workloads in Docker?
  7. How do you implement role-based access control (RBAC) in Docker?
  8. How do you monitor Docker containers at scale?
  9. What tools do you use for Docker logging?
  10. How do you set up centralized log management with Docker?
  11. Explain Docker swarm manager and worker roles.
  12. How does Raft consensus work in Docker Swarm?
  13. How do you troubleshoot Docker networking issues?
  14. How do you debug a container that is not starting?
  15. Explain overlay networks with encryption.
  16. How do you configure persistent storage in Swarm mode?
  17. What is the difference between global and replicated services in Swarm?
  18. How do you handle stateful applications in Docker?
  19. How do you integrate Docker with Kubernetes?
  20. Explain how container orchestration works.
  21. How do you manage multi-cloud deployments with Docker?
  22. How does Docker integrate with service meshes like Istio?
  23. Explain the concept of rootless Docker.
  24. How do you design a secure Docker-based architecture?
  25. Predict the future trends of Docker and containerization.

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