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FROM java:8

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COPY target/my-application.jar /app/my-application.jar

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CMD ["java", "-jar", "/app/my-application.jar"]

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docker build -t my-application .
docker push my-application

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docker swarm init --listen-addr <manager-ip>

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docker swarm join --token <join-token> <manager-ip>

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version: '3.8'

services:
  my-application:
    image: my-application
    deploy:
      replicas: 3
      restart_policy:
        condition: on-failure
    ports:
      - "8080:8080"

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docker stack deploy -c docker-stack.yml my-application

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@RestController
public class HelloController {

    @RequestMapping("/")
    public String index() {
        return "Hello, Docker!";
    }

}

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