Question 1

True or false: Docker Compose files can define multiple services, networks, and volumes in a single YAML file.

Accepted Answer

True. Compose allows you to orchestrate multi-container apps with all resources declared in one docker-compose.yml.

Question 2

True or false: Docker images are always smaller than their corresponding virtual machine images.

Accepted Answer

False. Images can be large if they include full OS layers; VMs with slimmed OS can sometimes be comparable or smaller.

Question 3

True or false: Docker containers share the host kernel, so you cannot run a Windows container on a Linux host.

Accepted Answer

True. Containers rely on the host OS kernel; Linux hosts lack the Windows kernel, making native Windows containers impossible.

Question 4

True or false: Docker containers are completely isolated from each other and cannot communicate unless explicitly configured.

Accepted Answer

False. By default, containers on the same Docker network can communicate; isolation is per network, not absolute.

Question 5

True or false: Docker images use copy-on-write layers, so running multiple containers from the same image shares the base layers.

Accepted Answer

True. Each container adds a thin writable layer on top of read-only image layers, saving disk space and speeding startup.

Question 6

True or false: Docker Desktop is free for all commercial use without any licensing restrictions.

Accepted Answer

False. Docker Desktop requires a paid subscription for commercial use in large enterprises (over 250 employees or $10M revenue).

Question 7

True or false: Docker containers can run on Windows without a Linux VM using Docker Desktop's WSL 2 backend.

Accepted Answer

True. Docker Desktop leverages WSL 2 on Windows to run Linux containers natively, no separate VM required.

Question 8

True or false: You can run Docker containers that have their own init system, like systemd, inside them.

Accepted Answer

False. Containers typically lack the privileges and cgroup setup for full init systems; it's possible but requires special flags and is not standard.

Docker Trivia Questions