Docker.

Container images, runtimes, and containerized workflows. Covers 10 sub-skills.

• Docker · 1 of 3

  Images, Containers & Registries

  Which command lists all running containers?

  Adocker lsBdocker listCdocker containersDdocker ps

• Docker · 2 of 3

  BuildKit & Buildx

  Which flag specifies target platforms in a Buildx build command?

  A--target-osB--multiarchC--arch-listD--platform

• Docker · 3 of 3

  Debugging Containers

  A dev runs docker stats for one workload; CPU% reads ~800% and they file a bug. The box has 8 vCPUs. What explains that figure?

  Athe figure is cumulative since first startBthe engine double-counts kernel steal for cgroupsCthe column is normalized per single-thread unitDchild PIDs are summed without de-duplicating tasks