Rules

• Do not use production secrets.
• Justify every answer with Docker terminology.
• Separate observation, interpretation and action.
• Record cleanup steps whenever you mention resources.

Questions

Question 01: Engine

Describe a realistic Docker scenario for Engine. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 02: CLI

Describe a realistic Docker scenario for CLI. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 03: Images

Describe a realistic Docker scenario for Images. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 04: Container

Describe a realistic Docker scenario for Container. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 05: einfache Dockerfiles

Describe a realistic Docker scenario for einfache Dockerfiles. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 06: Netzwerke

Describe a realistic Docker scenario for Netzwerke. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 07: Volumes

Describe a realistic Docker scenario for Volumes. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 08: Engine

Describe a realistic Docker scenario for Engine. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 09: CLI

Describe a realistic Docker scenario for CLI. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 10: Images

Describe a realistic Docker scenario for Images. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 11: Container

Describe a realistic Docker scenario for Container. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 12: einfache Dockerfiles

Describe a realistic Docker scenario for einfache Dockerfiles. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 13: Netzwerke

Describe a realistic Docker scenario for Netzwerke. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 14: Volumes

Describe a realistic Docker scenario for Volumes. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 15: Engine

Describe a realistic Docker scenario for Engine. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 16: CLI

Describe a realistic Docker scenario for CLI. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 17: Images

Describe a realistic Docker scenario for Images. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 18: Container

Describe a realistic Docker scenario for Container. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 19: einfache Dockerfiles

Describe a realistic Docker scenario for einfache Dockerfiles. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 20: Netzwerke

Describe a realistic Docker scenario for Netzwerke. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 21: Volumes

Describe a realistic Docker scenario for Volumes. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 22: Engine

Describe a realistic Docker scenario for Engine. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 23: CLI

Describe a realistic Docker scenario for CLI. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 24: Images

Describe a realistic Docker scenario for Images. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 25: Container

Describe a realistic Docker scenario for Container. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 26: einfache Dockerfiles

Describe a realistic Docker scenario for einfache Dockerfiles. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 27: Netzwerke

Describe a realistic Docker scenario for Netzwerke. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 28: Volumes

Describe a realistic Docker scenario for Volumes. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 29: Engine

Describe a realistic Docker scenario for Engine. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 30: CLI

Describe a realistic Docker scenario for CLI. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 31: Images

Describe a realistic Docker scenario for Images. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 32: Container

Describe a realistic Docker scenario for Container. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 33: einfache Dockerfiles

Describe a realistic Docker scenario for einfache Dockerfiles. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 34: Netzwerke

Describe a realistic Docker scenario for Netzwerke. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 35: Volumes

Describe a realistic Docker scenario for Volumes. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 36: Engine

Describe a realistic Docker scenario for Engine. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 37: CLI

Describe a realistic Docker scenario for CLI. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 38: Images

Describe a realistic Docker scenario for Images. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 39: Container

Describe a realistic Docker scenario for Container. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Question 40: einfache Dockerfiles

Describe a realistic Docker scenario for einfache Dockerfiles. Which resource is affected, which command proves state, what risk appears and how would you safely clean up?

Practical Case Study

You inherit a team repository with a Dockerfile, a Compose file and unclear volumes. Build a review plan covering build context, base image, user, ports, volumes, networks, logs, secrets and cleanup.

Review Checklist for Fundamentals Assessment

• 01. document context and desired state: record the affected Docker resource, the command that proves state and the rollback path.
• 02. explain the command before running it: record the affected Docker resource, the command that proves state and the rollback path.
• 03. prove current state with inspect: record the affected Docker resource, the command that proves state and the rollback path.
• 04. capture logs and exit code: record the affected Docker resource, the command that proves state and the rollback path.
• 05. sketch the network path: record the affected Docker resource, the command that proves state and the rollback path.
• 06. check the volume lifecycle: record the affected Docker resource, the command that proves state and the rollback path.
• 07. assess image provenance: record the affected Docker resource, the command that proves state and the rollback path.
• 08. distinguish tag and digest: record the affected Docker resource, the command that proves state and the rollback path.
• 09. explain build cache impact: record the affected Docker resource, the command that proves state and the rollback path.
• 10. write down rollback or cleanup path: record the affected Docker resource, the command that proves state and the rollback path.
• 11. name the security impact: record the affected Docker resource, the command that proves state and the rollback path.
• 12. rate the operational risk: record the affected Docker resource, the command that proves state and the rollback path.
• 13. document context and desired state: record the affected Docker resource, the command that proves state and the rollback path.
• 14. explain the command before running it: record the affected Docker resource, the command that proves state and the rollback path.
• 15. prove current state with inspect: record the affected Docker resource, the command that proves state and the rollback path.
• 16. capture logs and exit code: record the affected Docker resource, the command that proves state and the rollback path.
• 17. sketch the network path: record the affected Docker resource, the command that proves state and the rollback path.
• 18. check the volume lifecycle: record the affected Docker resource, the command that proves state and the rollback path.
• 19. assess image provenance: record the affected Docker resource, the command that proves state and the rollback path.
• 20. distinguish tag and digest: record the affected Docker resource, the command that proves state and the rollback path.
• 21. explain build cache impact: record the affected Docker resource, the command that proves state and the rollback path.
• 22. write down rollback or cleanup path: record the affected Docker resource, the command that proves state and the rollback path.
• 23. name the security impact: record the affected Docker resource, the command that proves state and the rollback path.
• 24. rate the operational risk: record the affected Docker resource, the command that proves state and the rollback path.
• 25. document context and desired state: record the affected Docker resource, the command that proves state and the rollback path.
• 26. explain the command before running it: record the affected Docker resource, the command that proves state and the rollback path.
• 27. prove current state with inspect: record the affected Docker resource, the command that proves state and the rollback path.
• 28. capture logs and exit code: record the affected Docker resource, the command that proves state and the rollback path.
• 29. sketch the network path: record the affected Docker resource, the command that proves state and the rollback path.
• 30. check the volume lifecycle: record the affected Docker resource, the command that proves state and the rollback path.
• 31. assess image provenance: record the affected Docker resource, the command that proves state and the rollback path.
• 32. distinguish tag and digest: record the affected Docker resource, the command that proves state and the rollback path.
• 33. explain build cache impact: record the affected Docker resource, the command that proves state and the rollback path.
• 34. write down rollback or cleanup path: record the affected Docker resource, the command that proves state and the rollback path.
• 35. name the security impact: record the affected Docker resource, the command that proves state and the rollback path.
• 36. rate the operational risk: record the affected Docker resource, the command that proves state and the rollback path.

Practice Appendix: Fundamentals Assessment

This appendix provides a backlog for longer trainings, reviews and repetition. Each task is deliberately small so it can be verified and discussed independently.

A001. Engine

• Task: document context and desired state and explicitly relate the observation to Engine.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A002. CLI

• Task: explain the command before running it and explicitly relate the observation to CLI.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A003. Images

• Task: prove current state with inspect and explicitly relate the observation to Images.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A004. Container

• Task: capture logs and exit code and explicitly relate the observation to Container.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A005. einfache Dockerfiles

• Task: sketch the network path and explicitly relate the observation to einfache Dockerfiles.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A006. Netzwerke

• Task: check the volume lifecycle and explicitly relate the observation to Netzwerke.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A007. Volumes

• Task: assess image provenance and explicitly relate the observation to Volumes.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A008. Docker Engine

• Task: distinguish tag and digest and explicitly relate the observation to Docker Engine.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A009. Docker CLI

• Task: explain build cache impact and explicitly relate the observation to Docker CLI.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A010. Docker Daemon

• Task: write down rollback or cleanup path and explicitly relate the observation to Docker Daemon.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A011. Image

• Task: name the security impact and explicitly relate the observation to Image.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A012. Container

• Task: rate the operational risk and explicitly relate the observation to Container.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A013. Dockerfile

• Task: document context and desired state and explicitly relate the observation to Dockerfile.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A014. Build Context

• Task: explain the command before running it and explicitly relate the observation to Build Context.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A015. Layer

• Task: prove current state with inspect and explicitly relate the observation to Layer.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A016. Tag and Digest

• Task: capture logs and exit code and explicitly relate the observation to Tag and Digest.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A017. Registry

• Task: sketch the network path and explicitly relate the observation to Registry.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A018. Network

• Task: check the volume lifecycle and explicitly relate the observation to Network.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A019. Volume

• Task: assess image provenance and explicitly relate the observation to Volume.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A020. Bind Mount

• Task: distinguish tag and digest and explicitly relate the observation to Bind Mount.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A021. Compose

• Task: explain build cache impact and explicitly relate the observation to Compose.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A022. Rootless Mode

• Task: write down rollback or cleanup path and explicitly relate the observation to Rootless Mode.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A023. Socket

• Task: name the security impact and explicitly relate the observation to Socket.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A024. Engine

• Task: rate the operational risk and explicitly relate the observation to Engine.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A025. CLI

• Task: document context and desired state and explicitly relate the observation to CLI.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A026. Images

• Task: explain the command before running it and explicitly relate the observation to Images.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A027. Container

• Task: prove current state with inspect and explicitly relate the observation to Container.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A028. einfache Dockerfiles

• Task: capture logs and exit code and explicitly relate the observation to einfache Dockerfiles.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A029. Netzwerke

• Task: sketch the network path and explicitly relate the observation to Netzwerke.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A030. Volumes

• Task: check the volume lifecycle and explicitly relate the observation to Volumes.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A031. Docker Engine

• Task: assess image provenance and explicitly relate the observation to Docker Engine.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A032. Docker CLI

• Task: distinguish tag and digest and explicitly relate the observation to Docker CLI.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A033. Docker Daemon

• Task: explain build cache impact and explicitly relate the observation to Docker Daemon.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A034. Image

• Task: write down rollback or cleanup path and explicitly relate the observation to Image.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A035. Container

• Task: name the security impact and explicitly relate the observation to Container.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A036. Dockerfile

• Task: rate the operational risk and explicitly relate the observation to Dockerfile.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A037. Build Context

• Task: document context and desired state and explicitly relate the observation to Build Context.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A038. Layer

• Task: explain the command before running it and explicitly relate the observation to Layer.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A039. Tag and Digest

• Task: prove current state with inspect and explicitly relate the observation to Tag and Digest.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A040. Registry

• Task: capture logs and exit code and explicitly relate the observation to Registry.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A041. Network

• Task: sketch the network path and explicitly relate the observation to Network.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A042. Volume

• Task: check the volume lifecycle and explicitly relate the observation to Volume.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A043. Bind Mount

• Task: assess image provenance and explicitly relate the observation to Bind Mount.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A044. Compose

• Task: distinguish tag and digest and explicitly relate the observation to Compose.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A045. Rootless Mode

• Task: explain build cache impact and explicitly relate the observation to Rootless Mode.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A046. Socket

• Task: write down rollback or cleanup path and explicitly relate the observation to Socket.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A047. Engine

• Task: name the security impact and explicitly relate the observation to Engine.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A048. CLI

• Task: rate the operational risk and explicitly relate the observation to CLI.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A049. Images

• Task: document context and desired state and explicitly relate the observation to Images.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A050. Container

• Task: explain the command before running it and explicitly relate the observation to Container.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A051. einfache Dockerfiles

• Task: prove current state with inspect and explicitly relate the observation to einfache Dockerfiles.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A052. Netzwerke

• Task: capture logs and exit code and explicitly relate the observation to Netzwerke.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A053. Volumes

• Task: sketch the network path and explicitly relate the observation to Volumes.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A054. Docker Engine

• Task: check the volume lifecycle and explicitly relate the observation to Docker Engine.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A055. Docker CLI

• Task: assess image provenance and explicitly relate the observation to Docker CLI.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A056. Docker Daemon

• Task: distinguish tag and digest and explicitly relate the observation to Docker Daemon.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A057. Image

• Task: explain build cache impact and explicitly relate the observation to Image.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A058. Container

• Task: write down rollback or cleanup path and explicitly relate the observation to Container.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A059. Dockerfile

• Task: name the security impact and explicitly relate the observation to Dockerfile.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A060. Build Context

• Task: rate the operational risk and explicitly relate the observation to Build Context.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A061. Layer

• Task: document context and desired state and explicitly relate the observation to Layer.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A062. Tag and Digest

• Task: explain the command before running it and explicitly relate the observation to Tag and Digest.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A063. Registry

• Task: prove current state with inspect and explicitly relate the observation to Registry.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A064. Network

• Task: capture logs and exit code and explicitly relate the observation to Network.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A065. Volume

• Task: sketch the network path and explicitly relate the observation to Volume.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A066. Bind Mount

• Task: check the volume lifecycle and explicitly relate the observation to Bind Mount.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A067. Compose

• Task: assess image provenance and explicitly relate the observation to Compose.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A068. Rootless Mode

• Task: distinguish tag and digest and explicitly relate the observation to Rootless Mode.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A069. Socket

• Task: explain build cache impact and explicitly relate the observation to Socket.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A070. Engine

• Task: write down rollback or cleanup path and explicitly relate the observation to Engine.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A071. CLI

• Task: name the security impact and explicitly relate the observation to CLI.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A072. Images

• Task: rate the operational risk and explicitly relate the observation to Images.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A073. Container

• Task: document context and desired state and explicitly relate the observation to Container.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A074. einfache Dockerfiles

• Task: explain the command before running it and explicitly relate the observation to einfache Dockerfiles.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A075. Netzwerke

• Task: prove current state with inspect and explicitly relate the observation to Netzwerke.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

A076. Volumes

• Task: capture logs and exit code and explicitly relate the observation to Volumes.
• Evidence: Write down at least one Docker command, one expected result and one limit of that evidence.
• Operations question: What would a wrong assumption change in a CI runner, on a developer workstation and on a shared host?
• Security question: Which permission, secret or host path is most sensitive in this step?
• Cleanup: Describe which containers, images, networks, volumes or temporary files must be removed.

Official Sources and Scope

The material is aligned with public Docker documentation. When the workshop mentions external tools around Docker Engine, those tools are presented as adjacent operational practice, not as Docker Engine features.

• Docker Engine: https://docs.docker.com/engine/
• Dockerfile Reference: https://docs.docker.com/reference/dockerfile/
• Compose File Reference: https://docs.docker.com/reference/compose-file/
• Compose Specification: https://github.com/compose-spec/compose-spec/blob/master/spec.md
• Docker Engine Security: https://docs.docker.com/engine/security/
• Docker Rootless Mode: https://docs.docker.com/engine/security/rootless/
• Protect the Docker Daemon Socket: https://docs.docker.com/engine/security/protect-access/
• Docker Build Best Practices: https://docs.docker.com/build/building/best-practices/
• Docker Training: https://www.docker.com/trainings/

Additional Review Drills

Use these drills when the primary task is complete and the learner needs another pass over operational reasoning. They are intentionally evidence-oriented and can be answered without inventing platform behavior.

Drill 01: image provenance

• State which Docker object or host boundary is affected by image provenance.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.

Drill 02: build context

• State which Docker object or host boundary is affected by build context.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.

Drill 03: layer ordering

• State which Docker object or host boundary is affected by layer ordering.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.

Drill 04: container user

• State which Docker object or host boundary is affected by container user.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.

Drill 05: mounts and volumes

• State which Docker object or host boundary is affected by mounts and volumes.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.

Drill 06: bridge network

• State which Docker object or host boundary is affected by bridge network.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.

Drill 07: port publishing

• State which Docker object or host boundary is affected by port publishing.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.

Drill 08: Compose configuration

• State which Docker object or host boundary is affected by Compose configuration.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.

Drill 09: daemon socket

• State which Docker object or host boundary is affected by daemon socket.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.

Drill 10: registry access

• State which Docker object or host boundary is affected by registry access.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.

Drill 11: rootless mode

• State which Docker object or host boundary is affected by rootless mode.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.

Drill 12: seccomp and capabilities

• State which Docker object or host boundary is affected by seccomp and capabilities.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.

Drill 13: logs and events

• State which Docker object or host boundary is affected by logs and events.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.

Drill 14: cleanup and rollback

• State which Docker object or host boundary is affected by cleanup and rollback.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.

Drill 15: image provenance

• State which Docker object or host boundary is affected by image provenance.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.

Drill 16: build context

• State which Docker object or host boundary is affected by build context.
• Name one command that produces evidence and one field in the output that matters.
• Explain what can be concluded from that evidence and what cannot be concluded from it.
• Describe the safest cleanup path for a shared training host.