Deploying services in Swarm in Docker - Mini Project: Build & Apply

Deploying services in Swarm

📖 Scenario: You are managing a small web application that needs to run on multiple Docker nodes using Docker Swarm. You want to deploy a simple web service that can scale easily and be managed centrally.

🎯 Goal: Learn how to create a Docker Swarm service, configure its replicas, and verify the deployment status.

📋 What You'll Learn

Initialize Docker Swarm mode on your machine

Create a Docker service running the nginx image

Set the number of replicas for the service

Check the status of the deployed service

💡 Why This Matters

🌍 Real World

Docker Swarm is used to manage containerized applications across multiple machines, making it easier to deploy, scale, and maintain services.

💼 Career

Understanding how to deploy and manage services in Docker Swarm is essential for DevOps roles that involve container orchestration and cloud-native application management.

1

Initialize Docker Swarm

Run the command docker swarm init to initialize Docker Swarm mode on your machine.

Docker

# Run the command to initialize Docker Swarm
# Your code here

Need a hint?

Use the docker swarm init command to start Swarm mode on your local Docker engine.

2

Create a Docker service

Create a Docker service named webserver using the nginx:latest image with 3 replicas by running the command docker service create --name webserver --replicas 3 nginx:latest.

Docker

docker swarm init
# Create the webserver service with 3 replicas
# Your code here

Need a hint?

Use docker service create with the --name and --replicas options to deploy the service.

3

Check the service status

Run the command docker service ls to list all running services and verify that the webserver service is running with 3/3 replicas.

Docker

docker swarm init
docker service create --name webserver --replicas 3 nginx:latest
# Check the status of the webserver service
# Your code here

Need a hint?

Use docker service ls to see the list of services and their replica counts.

4

Display the service details

Run the command docker service ps webserver to display detailed information about the tasks of the webserver service.

Docker

docker swarm init
docker service create --name webserver --replicas 3 nginx:latest
docker service ls
# Show detailed task information for the webserver service
# Your code here

Need a hint?

Use docker service ps webserver to see the status of each replica task.