Write down Docker Compose file for Rust and MySQL application

Docker Compose file for a Rust app with a MySQL database. This example is for when you have a Rust app in a folder called rust_app with a Cargo.toml file, and you want to link it to a MySQL database.

docker-compose.yml:

version: '3'
services:
  rust_app:
    build:
      context: ./rust_app
    depends_on:
      - mysql
    ports:
      - "8080:8080"
    environment:
      - DATABASE_URL=mysql://root:password@mysql:3306/mydatabase
    networks:
      - my_network

  mysql:
    image: mysql:8.0
    environment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_DATABASE: mydatabase
    ports:
      - "3306:3306"
    networks:
      - my_network

networks:
  my_network:
    driver: bridge

In this Docker Compose file:

• The rust_app service makes the Rust app using the Dockerfile in the ./rust_app folder. It depends on the mysql service, and the app's HTTP port 8080 is linked to the host.

• The mysql service uses the official MySQL 8.0 image and sets environment variables for the root password and the database to be created.

• The networks part creates a custom bridge network called my_network. This lets the Rust app and the MySQL service talk to each other.

Dockerfile (inside the ./rust_app directory):

# Use the official Rust image as the base image
FROM rust:latest

# Set the working directory
WORKDIR /app

# Copy the application code into the container
COPY . .

# Build the Rust application
RUN cargo build --release

# Expose the port on which the Rust application will run
EXPOSE 8080

# Run the Rust application
CMD ["target/release/your_rust_app_binary"]

Change your_rust_app_binary to the real binary name from your Rust application. Also, remember to update the DATABASE_URL environment variable in the docker-compose.yml file so it matches your MySQL connection information.

To use this Docker Compose setup:

1. Place the docker-compose.yml file in the root directory of your project.

2. Create a Dockerfile in the ./rust_app directory with the content above.

3. Run the following commands in the terminal:

    docker-compose up
   

This will create and start both the Rust app and the MySQL database containers. Visit your Rust app at http://localhost:8080. The app will connect to the MySQL database set in the DATABASE_URL environment variable.