Docker MCQs with answers Page - 53

Dear candidates you will find MCQ questions of Docker here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
Share your questions by clicking Add Question

📊 Docker
Q. Which role has access to secrets on a Docker Swarm manager node?
  • (A) Any Docker user
  • (B) Only root
  • (C) Only the Docker daemon
  • (D) Docker group users
💬 Discuss
✅ Correct Answer: (C) Only the Docker daemon

Explanation: Only the Docker daemon has access to secrets stored on a Swarm manager node.

📊 Docker
Q. How do you provide multiple secrets to a service in Docker?
  • (A) Use a comma-separated list
  • (B) Add multiple `--secret` flags
  • (C) Use a secrets bundle
  • (D) Use a YAML config file
💬 Discuss
✅ Correct Answer: (B) Add multiple `--secret` flags

Explanation: Each secret is added to a service using a separate `--secret` flag.

📊 Docker
Q. Can secrets be shared across multiple services in Docker?
  • (A) Yes, without restriction
  • (B) Only if they are redefined
  • (C) Yes, if explicitly attached to each service
  • (D) No, secrets are service-specific
💬 Discuss
✅ Correct Answer: (C) Yes, if explicitly attached to each service

Explanation: Secrets can be reused by different services if explicitly attached to each.

📊 Docker
Q. Can secrets be accessed by a non-root user inside the container?
  • (A) Yes, if the user has read permission
  • (B) No, secrets are always root-only
  • (C) Yes, via environment variables
  • (D) No, they must be copied manually
💬 Discuss
✅ Correct Answer: (A) Yes, if the user has read permission

Explanation: Secrets have 0400 permission, so any user who can read the file may access it.

📊 Docker
Q. What file system do secrets use inside containers?
  • (A) ext4
  • (B) tmpfs
  • (C) overlay2
  • (D) aufs
💬 Discuss
✅ Correct Answer: (B) tmpfs

Explanation: Docker secrets are mounted using a tmpfs in-memory filesystem for security.

📊 Docker
Q. Which YAML section in Docker Compose is used to declare secrets?
  • (A) configs
  • (B) volumes
  • (C) secrets
  • (D) files
💬 Discuss
✅ Correct Answer: (C) secrets

Explanation: In Docker Compose, secrets are declared in the `secrets` section.

📊 Docker
Q. How do you assign a secret to a service in Docker Compose?
  • (A) Under the `volumes` key
  • (B) Under the `env_file` key
  • (C) Under the `secrets` key inside the service
  • (D) With the `command` key
💬 Discuss
✅ Correct Answer: (C) Under the `secrets` key inside the service

Explanation: You assign secrets under the `secrets` key inside a service definition.

📊 Docker
Q. What is the main advantage of Docker secrets over environment variables?
  • (A) They use more memory
  • (B) They are easier to manage
  • (C) They are encrypted and not exposed via `docker inspect`
  • (D) They are visible in logs
💬 Discuss
✅ Correct Answer: (C) They are encrypted and not exposed via `docker inspect`

Explanation: Unlike environment variables, secrets are secure and not visible in container inspection output.

📊 Docker
Q. What is the purpose of Docker configs?
  • (A) To store encrypted passwords
  • (B) To manage application source code
  • (C) To store non-sensitive configuration data
  • (D) To log container output
💬 Discuss
✅ Correct Answer: (C) To store non-sensitive configuration data

Explanation: Docker configs are used to manage non-sensitive configuration data like config files and settings.

📊 Docker
Q. Which Docker mode is required to use Docker configs?
  • (A) Standalone mode
  • (B) Compose mode
  • (C) Swarm mode
  • (D) Bridge mode
💬 Discuss
✅ Correct Answer: (C) Swarm mode

Explanation: Docker configs are only available when running services in Docker Swarm mode.

Programming Categories

📱 Download Our App

Learn MCQs on the go with our easy-to-use Android app

Get it on Google Play