Getting “docker”: executable file not found in $PATH using marathon

I’m trying to launch an app on marathon, here’s it’s json:

    "id": "jackex",
    "container": {
        "docker": {
            "image": "ubuntu:14.04"
        "type": "DOCKER",
        "volumes": []
    "cmd": "while sleep 10; do date -u +%T; done",
    "cpus": 0.2,
    "mem": 200,
    "instances": 1

But I’m getting the following error on the tasks log:

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  • “docker”: executable file not found in $PATH

    Does anyone knows what’s the problem?

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