Marathon app definition demonstrating how to run a task inside a docker container with bridged networking.

bridged.json

{
  "id": "bridged-webapp",
  "cmd": "python3 -m http.server $PORT0",
  "cpus": 0.5,
  "mem": 64.0,
  "instances": 2,
  "container": {
    "type": "DOCKER",
    "docker": {
      "image": "python:3",
      "network": "BRIDGE",
      "portMappings": [
        { "containerPort": 8080, "hostPort": 0, "protocol": "tcp"},
        { "containerPort": 161, "hostPort": 0, "protocol": "udp"}
      ]
    }
  },
  "healthChecks": [
    {
      "protocol": "HTTP",
      "portIndex": 0,
      "path": "/",
      "gracePeriodSeconds": 5,
      "intervalSeconds": 20,
      "maxConsecutiveFailures": 3
    }
  ]
}