Introduction

Docker Swarm is a native clustering and orchestration tool for Docker containers. It allows you to create and manage a cluster of Docker hosts, making it easy to deploy and scale containerized applications. This tutorial will guide you through the process of installing Docker Swarm on Ubuntu 22.04.

Prerequisites

Before you begin, ensure you have:

1. An Ubuntu 22.04 server or desktop system
2. SSH access to the server (optional)
3. Root or sudo privileges

Step 1: Install Docker

Update the package repository and install Docker:

sudo apt update
sudo apt install -y docker.io

Start and enable the Docker service:

sudo systemctl start docker
sudo systemctl enable docker

Step 2: Initialize Docker Swarm

Initialize Docker Swarm on the manager node:

sudo docker swarm init

Make note of the token displayed in the output. You will need this token to join worker nodes to the swarm.

Step 3: Join Worker Nodes

To join worker nodes to the swarm, run the following command on each worker node:

sudo docker swarm join --token [your_token] [manager_ip]:2377

Replace [your_token] with the token obtained from the manager node and [manager_ip] with the IP address of the manager node.

Step 4: Verify Swarm Status

Verify the status of the Docker Swarm:

sudo docker node ls

You should see the manager and worker nodes listed.

Conclusion

Congratulations! You have successfully installed Docker Swarm on Ubuntu 22.04. You can now use Docker Swarm to manage and orchestrate containers across multiple nodes in your cluster.