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Docker Swarm & Orchestration Flashcards

7 cards from real DCA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What command initializes a Docker Swarm and makes the current node a manager?

    Answer: docker swarm init

    `docker swarm init` initializes a new Swarm on the current node and designates it as the first manager.

  2. Which TCP port does Docker Swarm use by default for manager-to-manager communication (Raft consensus)?

    Answer: 2377

    Port 2377 is reserved for Swarm cluster management communications between manager nodes.

  3. In Docker Swarm, what is a 'task'?

    Answer: A running container instance that is part of a service

    A task is the atomic scheduling unit in Swarm — it represents a single running container that belongs to a service.

  4. What command retrieves the join token needed to add a worker node to an existing Swarm?

    Answer: docker swarm join-token worker

    `docker swarm join-token worker` outputs the full `docker swarm join` command with the token required for a worker to join.

  5. What is the key difference between 'replicated' and 'global' service modes in Docker Swarm?

    Answer: Replicated services run a specified number of task copies; global services run exactly one task on every available node

    In replicated mode you define a desired replica count; in global mode, the Swarm schedules exactly one task per available node.

  6. Which command lists all nodes currently participating in a Docker Swarm?

    Answer: docker node ls

    `docker node ls` lists every node in the Swarm along with its role, status, and availability.

  7. How do you scale a replicated service named 'web' to 5 replicas in Docker Swarm?

    Answer: docker service scale web=5

    `docker service scale web=5` is the correct syntax, using `name=count` format to set the desired replica count.

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