flask.json

{
    "project": "$PROJECT",
    "services": [
        {
            "id": "frontend",
            "apps": [
                {
                    "id": "nginx",
                    "domain": {
                        "uri": "$URI"
                    },
                    "port_mappings": [
                        {
                            "container_port": 80
                        }
                    ],
                    "mem": 256,
                    "image": "sloppy/nginx",
                    "instances": 1,
                    "env": {
                        "URI": "$URI",
                        "URIBACKEND": "flask.backend.$PROJECT"
                    },
                    "dependencies": [
                        "../backend/flask"
                    ],
                    "health_checks": [
                        {
                            "timeout_seconds": 10,
                            "interval_seconds": 10,
                            "max_consecutive_failures": 2,
                            "path": "/",
                            "type": "HTTP",
                            "grace_period_seconds": 3
                        }
                    ]
                }
            ]
        },
        {
            "id": "backend",
            "apps": [
                {
                    "id": "flask",
                    "mem": 128,
                    "image": "sloppy/flask",
                    "instances": 1,
                    "env": {
                        "URIBACKEND": "flask.backend.$PROJECT",
                        "MESSAGE": "Hello world on sloppy.io"
                    }
                }
            ]
        }
    ]
}