Lab
A Cloud Guru

Building a Docker Swarm

Docker swarm allows you to quickly move beyond simply using Docker to run containers. With swarm, you can easily set up a cluster of Docker servers capable of providing useful orchestration features. This lab will allow you to become familiar with the process of setting up a simple swarm cluster on a set of servers. You will configure a swarm master and two worker nodes, forming a working swarm cluster.

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Path Info

Level

Intermediate

Duration

1h 0m

Published

May 03, 2019

Challenge

Install Docker CE on all three nodes.

On all three servers, install Docker CE.

sudo apt-get update

sudo apt-get -y install 
   apt-transport-https 
   ca-certificates 
   curl 
   gnupg-agent 
   software-properties-common

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

sudo add-apt-repository 
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu 
   $(lsb_release -cs) 
   stable"

sudo apt-get update

sudo apt-get install -y docker-ce=5:18.09.5~3-0~ubuntu-bionic docker-ce-cli=5:18.09.5~3-0~ubuntu-bionic containerd.io

Add cloud_user to the Docker group so that you can run docker commands as cloud_user.

sudo usermod -a -G docker cloud_user

Log out each server, then log back in.

You can verify the installation on each server like so:

docker version

Challenge

Configure the swarm manager.
1. On the swarm manager server, initialize the swarm. Be sure to replace <swarm manager private IP> in this command with the actual Private IP of the swarm manager (NOT the public IP).
```
docker swarm init --advertise-addr <swarm manager private IP>
```
Challenge

Join the worker nodes to the cluster.
1. On the swarm manager, get a join command with a token:
```
docker swarm join-token worker
```
This should provide a command that begins docker swarm join .... Copy that command and run it on both worker servers.
1. Go back to the swarm manager and list the nodes.
```
docker node ls
```
Verify that you can see all three servers listed (including the manager). All three should have a status of READY. Once all three servers are ready, you have built your own Docker swarm cluster!

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!

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.