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Creating Dockerfile
& Composing it
Defining multi-container applications with docker-compose
Learning Outcome(Slide2)
5
Understand the role of docker-compose.yml file
4
Use Docker Compose to manage multiple container
3
Understand multi-container application
2
Know why Docker Compose is require
1
Understand what Docker Compose i
Earlier,we learned
Docker runs applications inside container
But in real-world applications,
Multiple services are required to work together
One container usually runs one service
Database
To manage these together, Docker provides Docker Compose
Example
Web application
Backend Service
Docker Compose
Understanding the Concept
Think about a restaurant system
Kitchen prepares food
All parts work together to run the restaurant
Billing counter handles payment
Delivery sends food
To define, manage, and run multiple containers together,
Docker Compose works the same way by running multiple containers together as one application
Docker provides a tool called Docker Compose
To define, manage, and run multiple containers together,
Docker Compose works the same way by running multiple containers together as one application
Docker provides a tool called Docker Compose
What is Docker Compose?
Docker Compose is a tool used to
Define and run multi-container applications using a single configuration file
This file called
docker-compose.yml
Start all services together
Docker Compose allows us to
Stop all services together
Manage application easily
Why Docker Compose is Needed
Application setup becomes complex
Without Docker Compose
Each container must be started manually
Managing networking between containers is difficult
Why Docker Compose is Needed
Making application setup simple and repeatable
Docker Compose solves this by
Running all containers with one command
Automatically connecting containers
What is a Multi-Container Application?
A multi-container application is an application that uses more than one container
Database container
All work together as one system
Frontend container
Backend container
Each container does a specific job But,
Role of docker-compose.yml File
The docker-compose.yml file
Defines ports, networks, and volume
It acts as a blueprint for the entire application
Defines services
Defines images or build instructions
How Docker Compose Works
Application becomes ready
User writes docker-compose.yml
Defines all required services
Runs docker-compose up
Docker Compose starts all containers
Advantages of Docker Compose
Ideal for development and testing
Easy management of multi-container apps
Single command to start/stop application
Consistent setup across environments
Real-World Example
Database container stores data
Docker Compose runs all three containers together with one command
A web application:
Frontend container runs UI
Backend container handles logic
Summary
4
Widely used in development environments
3
Simplifies application setup and management
2
Uses a single YAML configuration file
1
Docker Compose manages multi-container applications
Quiz
What is Docker Compose mainly used for?
A. Running a single container
B. Monitoring Docker logs
C. Managing multi-container applications
D. Building Docker images
Answer
What is Docker Compose mainly used for?
A. Running a single container
B. Monitoring Docker logs
C. Managing multi-container applications
D. Building Docker images
DevOps-Defining multi-container applications with docker-compose
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