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## Compose sample application
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### Use with Docker Development Environments
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You can open this sample in the Dev Environments feature of Docker Desktop version 4.12 or later.
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[Open in Docker Dev Environments <img src="../open_in_new.svg" alt="Open in Docker Dev Environments" align="top"/>](https://open.docker.com/dashboard/dev-envs?url=https://github.com/docker/awesome-compose/tree/master/react-java-mysql)
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### React application with a Spring backend and a MySQL database
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Project structure:
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```
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.
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├── backend
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│ ├── Dockerfile
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│ ...
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├── db
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│ └── password.txt
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├── compose.yaml
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├── frontend
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│ ├── ...
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│ └── Dockerfile
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└── README.md
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```
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[_compose.yaml_](compose.yaml)
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```
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services:
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backend:
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build: backend
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...
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db:
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# We use a mariadb image which supports both amd64 & arm64 architecture
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image: mariadb:10.6.4-focal
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# If you really want to use MySQL, uncomment the following line
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#image: mysql:8.0.27
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...
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frontend:
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build: frontend
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ports:
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- 3000:3000
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...
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```
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The compose file defines an application with three services `frontend`, `backend` and `db`.
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When deploying the application, docker compose maps port 3000 of the frontend service container to port 3000 of the host as specified in the file.
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Make sure port 3000 on the host is not already being in use.
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> ℹ️ **_INFO_**
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> For compatibility purpose between `AMD64` and `ARM64` architecture, we use a MariaDB as database instead of MySQL.
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> You still can use the MySQL image by uncommenting the following line in the Compose file
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> `#image: mysql:8.0.27`
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## Deploy with docker compose
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```
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$ docker compose up -d
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Creating network "react-java-mysql-default" with the default driver
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Building backend
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Step 1/17 : FROM maven:3.6.3-jdk-11 AS builder
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...
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Successfully tagged react-java-mysql_frontend:latest
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WARNING: Image for service frontend was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
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Creating react-java-mysql-frontend-1 ... done
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Creating react-java-mysql-db-1 ... done
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Creating react-java-mysql-backend-1 ... done
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```
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## Expected result
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Listing containers must show three containers running and the port mapping as below:
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```
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$ docker ps
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ONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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a63dee74d79e react-java-mysql-backend "java -Djava.securit…" 39 seconds ago Up 37 seconds react-java-mysql_backend-1
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6a7364c0812e react-java-mysql-frontend "docker-entrypoint.s…" 39 seconds ago Up 33 seconds 0.0.0.0:3000->3000/tcp react-java-mysql_frontend-1
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b176b18fbec4 mysql:8.0.19 "docker-entrypoint.s…" 39 seconds ago Up 37 seconds 3306/tcp, 33060/tcp react-java-mysql_db-1
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```
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After the application starts, navigate to `http://localhost:3000` in your web browser to get a colorful message.
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Stop and remove the containers
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```
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$ docker compose down
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Stopping react-java-mysql-backend-1 ... done
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Stopping react-java-mysql-frontend-1 ... done
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Stopping react-java-mysql-db-1 ... done
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Removing react-java-mysql-backend-1 ... done
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Removing react-java-mysql-frontend-1 ... done
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Removing react-java-mysql-db-1 ... done
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Removing network react-java-mysql-default
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```
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