Docker Swarm is a container orchestration tool that simplifies managing containers across multiple hosts. It turns a group of Docker nodes into a virtual system, enabling you to deploy and scale services effortlessly.

📌 Key Concepts

  • Swarm Mode: Enables clustering capabilities with docker swarm init
  • Nodes: Worker nodes execute tasks; manager nodes handle orchestration
  • Services: Define how to run containers (e.g., docker service create)
  • Stacks: Deploy multiple services with docker stack deploy

🧰 Step-by-Step Guide

  1. Install Docker
    Ensure Docker is installed on all nodes: Docker Installation Guide

  2. Initialize Swarm 

    docker swarm init --advertise-addr <MANAGER_IP>

    Cluster Management

  3. Join Worker Nodes
    Run docker swarm join --token <TOKEN> <MANAGER_IP>:2377 on worker machines

    Swarm Architecture

  4. Deploy a Service 

    docker service create --name my_web_app -p 80:80 nginx

    Service Status

  5. Manage Services
    Use docker service ls to view running services

    Service List

  6. Use Overlay Networks
    Create networks with docker network create -d overlay my_network

    Overlay Network

🌐 Extend Your Knowledge

For advanced topics like swarm security and load balancing, check out: /en/tutorials/docker_swarm_advanced

Let me know if you'd like to explore specific use cases or configurations! 😊