Docker MCQ Questions with answers and solutions Page 47

Q. Which of the following commands demotes a manager to a worker?

(A) docker node demote
(B) docker swarm demote
(C) docker manager down
(D) docker node update --role worker

💬 Discuss

✅ Correct Answer: (A) docker node demote

Explanation: `docker node demote` is used to change a manager node to a worker.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:18 am in Docker

Q. How do you leave a Docker Swarm?

(A) docker swarm exit
(B) docker leave
(C) docker swarm leave
(D) docker node remove

💬 Discuss

✅ Correct Answer: (C) docker swarm leave

Explanation: `docker swarm leave` removes the current node from the swarm.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:18 am in Docker

Q. What happens if all manager nodes are lost in a Swarm?

(A) Worker nodes become managers
(B) Cluster state is lost unless a backup is available
(C) Docker automatically recreates managers
(D) Swarm switches to legacy mode

💬 Discuss

✅ Correct Answer: (B) Cluster state is lost unless a backup is available

Explanation: Without manager nodes and a backup of the key-value store, Swarm loses its cluster state.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:18 am in Docker

Q. What command promotes a worker to manager?

(A) docker promote node
(B) docker node promote
(C) docker swarm promote
(D) docker node manager

💬 Discuss

✅ Correct Answer: (B) docker node promote

Explanation: `docker node promote` is used to promote a worker node to manager status.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:18 am in Docker

Q. Which command shows whether the current Docker engine is part of an active Swarm?

(A) docker swarm status
(B) docker node ls
(C) docker info
(D) docker swarm inspect

💬 Discuss

✅ Correct Answer: (C) docker info

Explanation: The output of docker info includes a Swarm section indicating whether the engine is active, inactive, or pending.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:19 am in Docker

Q. What flag is used with docker swarm init to advertise the manager’s reachable address?

(A) --advertise-addr
(B) --listen-addr
(C) --manager-addr
(D) --announce

💬 Discuss

✅ Correct Answer: (A) --advertise-addr

Explanation: --advertise-addr tells other nodes which IP/port to use when joining the Swarm.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:19 am in Docker

Q. Which Swarm service mode ensures one task runs on every eligible node?

(A) replicated
(B) global
(C) constraint
(D) daemon

💬 Discuss

✅ Correct Answer: (B) global

Explanation: The global service mode schedules exactly one task on each node that meets the placement criteria.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:19 am in Docker

Q. What is the command to view the current join tokens for a Swarm?

(A) docker swarm token list
(B) docker node token
(C) docker swarm join-token
(D) docker service token

💬 Discuss

✅ Correct Answer: (C) docker swarm join-token

Explanation: docker swarm join-token worker|manager displays or rotates the join token required by new nodes.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:19 am in Docker

Q. Which update failure action rolls back a service to the previous version automatically?

(A) pause
(B) continue
(C) rollback
(D) shutdown

💬 Discuss

✅ Correct Answer: (C) rollback

Explanation: Setting --update-failure-action rollback reverts tasks to the previous image if an update fails.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:19 am in Docker

Q. Which scheduling filter pins a service to nodes with a specific label?

(A) affinity
(B) placement constraint
(C) spread
(D) preference

💬 Discuss

✅ Correct Answer: (B) placement constraint

Explanation: Placement constraints such as --constraint 'node.labels.region==us-east' restrict tasks to labeled nodes.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:19 am in Docker

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