## Compose sample application ### Spark Java Project structure: ``` . ├── docker-compose.yaml ├── README.md └── sparkjava ├── Dockerfile └── ... ``` [_docker-compose.yaml_](docker-compose.yaml) ``` version: "3.7" services: sparkjava: build: sparkjava ports: - 8080:8080 ``` The compose file defines an application with one service `sparkjava`. When deploying the application, docker-compose maps port 8080 of the sparkjava service container to port 8080 of the host as specified in the file. Make sure port 8080 on the host is not already being in use. ## Deploy with docker-compose ``` $ docker-compose up -d Creating network "sparkjava_default" with the default driver Building sparkjava Step 1/11 : FROM maven:3.6.3-jdk-11 AS build 3.6.3-jdk-11: Pulling from library/maven ... Successfully tagged sparkjava_sparkjava:latest WARNING: Image for service sparkjava 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_sparkjava_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 5af94cb25394 sparkjava_sparkjava "/bin/sh -c 'java -j…" 20 seconds ago Up 19 seconds 0.0.0.0:8080->8080/tcp sparkjava_sparkjava_1 ``` After the application starts, navigate to `http://localhost:8080` in your web browser or run: ``` $ curl localhost:8080 Hello from Docker! ``` Stop and remove the containers ``` $ docker-compose down Stopping sparkjava_sparkjava_1 ... done Removing sparkjava_sparkjava_1 ... done Removing network sparkjava_default ```