Docker Compose Support in Spring Boot 3.1.0
Updated: May 7, 2023
Compose and Docker compatibility matrix > docker -v,
Note: Check the docker compose & docker engine (desktop) compatibility
What is Docker Compose?
Docker Compose is a tool for defining and running multi-container Docker applications. A Docker Compose file is a YAML file that defines the services, networks, and volumes for a Docker application.
In a Spring Boot application, a Docker Compose file can be used to define and run the various containers required for the application to run. For example, a typical Spring Boot application may require a container for the application itself, a container for a database, and a container for a message queue.
The Docker Compose file can define these containers and their dependencies, allowing them to be started and stopped as a single unit. This makes it easier to manage the entire application stack and ensures that all the containers are started and stopped together.
For a Spring Boot application, the Docker Compose file may define the following:
The Docker images for the Spring Boot application, database, and message queue
The ports that should be exposed for each container
The environment variables required for each container, such as database connection details
The volumes that should be mounted for each container, such as a volume for persistent data storage
Overall, using a Docker Compose file with a Spring Boot application can simplify the deployment process and make it easier to manage the application's dependencies.
Here is an example of a Docker Compose file for a simple Spring Boot application that uses a MySQL database:
version: '3.9'
services:
app:
image: myapp:latest
ports:
- "8080:8080"
environment:
- SPRING_DATASOURCE_URL=jdbc:mysql://db/mydb
- SPRING_DATASOURCE_USERNAME=root
- SPRING_DATASOURCE_PASSWORD=example
depends_on:
- db
db:
image: mysql:8.0
ports:
- "3306:3306"
environment:
- MYSQL_ROOT_PASSWORD=example
- MYSQL_DATABASE=mydb
volumes:
- ./data:/var/lib/mysql
In this example, we have two services defined: app and db. The app service defines the image for the Spring Boot application, exposes port 8080, and sets the required environment variables for connecting to the MySQL database. The db service defines the image for the MySQL database, exposes port 3306, sets the required environment variables for creating the database, and defines a volume for storing the database data.
The depends_on option for the app service ensures that the db service is started before the app service. This ensures that the database is available before the application attempts to connect to it.
To use this Docker Compose file, you would run the command docker-compose up in the same directory as the file. This would start both services and allow you to access the Spring Boot application at http://localhost:8080.
The Docker Compose file in this example makes it easy to manage the entire application stack. You can start and stop the entire application with a single command, and the file ensures that all of the containers are started and stopped together.
Additionally, if you need to make changes to the application or the database, you can simply update the Docker Compose file and then rebuild the Docker images. This can simplify the deployment process and make it easier to manage the application over time.
Overall, using Docker Compose with a Spring Boot application can be a powerful tool for managing the application's dependencies and simplifying the deployment process.
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