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## Compose sample application
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### Java Spark application with 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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└── 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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ports:
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- 8080:8080
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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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```
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The compose file defines an application with two services `backend` and `db`.
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When deploying the application, docker compose maps port 8080 of the backend service container to port 80 of the host as specified in the file.
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Make sure port 8080 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 "sparkjava-mysql_default" with the default driver
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Building backend
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...
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Successfully tagged sparkjava-mysql_backend:latest
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WARNING: Image for service backend 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 sparkjava-mysql_db_1 ... done
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Creating sparkjava-mysql_backend_1 ... done
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```
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## Expected result
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Listing containers must show two containers running and the port mapping as below:
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```
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$ docker ps
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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ee1e4f05d9f6 sparkjava-mysql_backend "/bin/sh -c 'java -j…" 44 seconds ago Up 43 seconds 0.0.0.0:8080->8080/tcp sparkjava-mysql_backend_1
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716025ddf65b mysql:8.0.19 "docker-entrypoint.s…" 44 seconds ago Up 43 seconds 3306/tcp, 33060/tcp sparkjava-mysql_db_1
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```
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After the application starts, run:
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```
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$ curl localhost:8080
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["Blog post #0","Blog post #1","Blog post #2","Blog post #3","Blog post #4"]
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```
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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 sparkjava-mysql_backend_1 ... done
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Stopping sparkjava-mysql_db_1 ... done
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Removing sparkjava-mysql_backend_1 ... done
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Removing sparkjava-mysql_db_1 ... done
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Removing network sparkjava-mysql_default
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```
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