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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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Level

Intermediate

Duration

1h 30m

Published

Nov 07, 2018

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
```
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
```

Challenge

Create a Service

Create a service with 3 replicas.

docker service create --name httpd -p 80:80 --replicas 3 httpd

Challenge

Scale the Service up to 5 Replicas
Scale the httpd service up to 5 replicas.
```
docker service scale httpd=5
```
Challenge

Scale the Service Down to 2 Replicas
Scale the httpd service down to 2 replicas.
```
docker service scale httpd=2
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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Scaling a Docker Swarm Service

Path Info

Table of Contents

Create a Swarm

Drain the Masters