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## Compose sample application
### Java Spark application with MySQL database
Project structure:
```
.
├── backend
│ ├── Dockerfile
│ └── ...
├── db
│ └── password.txt
├── docker-compose.yaml
└── README.md
```
[_docker-compose.yaml_ ](docker-compose.yaml )
```
version: "3.7"
services:
backend:
build: backend
ports:
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- 8080:8080
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db:
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image: mysql:8.0.19
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...
```
The compose file defines an application with two services `backend` and `db` .
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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## Deploy with docker-compose
```
$ docker-compose up -d
Creating network "sparkjava-mysql_default" with the default driver
Building backend
...
Successfully tagged sparkjava-mysql_backend:latest
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` .
Creating sparkjava-mysql_db_1 ... done
Creating sparkjava-mysql_backend_1 ... done
```
## Expected result
Listing containers must show two containers running and the port mapping as below:
```
$ docker ps
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
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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```
After the application starts, run:
```
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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 "]
```
Stop and remove the containers
```
$ docker-compose down
Stopping sparkjava-mysql_backend_1 ... done
Stopping sparkjava-mysql_db_1 ... done
Removing sparkjava-mysql_backend_1 ... done
Removing sparkjava-mysql_db_1 ... done
Removing network sparkjava-mysql_default
```