Marathon Task description for Python3 Docker container.

marathon-python3-docker.json

{
    "cmd": "env && python3 -m http.server $PORT0",
    "container": {
        "docker": {
            "image": "python:3"
        },
        "type": "DOCKER"
    },
    "cpus": 0.25,
    "healthChecks": [
        {
            "gracePeriodSeconds": 3,
            "intervalSeconds": 10,
            "maxConsecutiveFailures": 3,
            "path": "/",
            "portIndex": 0,
            "protocol": "HTTP",
            "timeoutSeconds": 5
        }
    ],
    "id": "python-app",
    "instances": 2,
    "mem": 50,
    "ports": [
        0
    ],
    "upgradeStrategy": {
        "minimumHealthCapacity": 0.5
    }
}