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

Accepted Answer

False. Docker Desktop's WSL 2 backend uses a real Linux kernel inside a lightweight virtual machine, so it does require a Linux VM. Thus, the statement is false.

Question 3

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 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 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 8

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

Accepted Answer

True. Containers can run init systems like systemd if configured with privileged mode and proper cgroup mounts. This is not the default but is commonly done for testing or specific use cases.

Docker Trivia Questions