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Scaling a Docker Swarm Service

For the last six months, the Acme Anvil Corporation has been migrating some of their bare metal infrastructure to Docker containers. A schism has developed between the members of your team on whether to use Docker Swarm or Kubernetes. To settle the dispute, your manager has decided to create a series of challenges. You have been tasked with setting up a Docker swarm with 5 nodes: 2 masters and 3 workers. The masters are to be configured to act only as masters. Next, you will create an httpd service with 3 replicas. Finally, you will scale the service up to 5 replicas and then down to 2.

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Path Info

Clock icon Intermediate
Clock icon 1h 30m
Clock icon Nov 07, 2018

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Table of Contents

  1. Challenge

    Create a Swarm

    Create a swarm with 2 masters and 3 worker nodes.

    Initilize the swarm.

    docker swarm init

    Use the join command to add the 3 worker nodes.

    docker swarm join --token TOKEN IP_ADDRESS:2377

    Generate the master token.

    docker swarm join-token manager
  2. Challenge

    Drain the Masters

    Set the availability to drain for Master1.

    docker node update --availability drain MASTER1

    Set the availability to drain for Master2.

    docker node update --availability drain MASTER2
  3. Challenge

    Create a Service

    Create a service with 3 replicas.

    docker service create --name httpd -p 80:80 --replicas 3 httpd
  4. Challenge

    Scale the Service up to 5 Replicas

    Scale the httpd service up to 5 replicas.

    docker service scale httpd=5
  5. Challenge

    Scale the Service Down to 2 Replicas

    Scale the httpd service down to 2 replicas.

    docker service scale httpd=2

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