This conponent is Obsoleted, try not use it!
mesosphere/marathon-lb
Marathon-lb is a service discovery & load balancing tool for DC/OS - mesosphere/marathon-lb
GitHubmesosphere

Marathon-lb is a tool for managing HAProxy, by consuming Marathon's app state. HAProxy is a fast, efficient, battle-tested, highly available load balancer with many advanced features which power a number of high-profile websites.

Deploy marathon-lb in docker way on marathon:

{
	"id": "marathon-lb",
	"instances": 3,
	"constraints": [
		["hostname", "UNIQUE"]
	],
	"container": {
		"type": "DOCKER",
		"docker": {
			"image": "docker.io/mesosphere/marathon-lb",
			"privileged": false,
			"network": "HOST"
		}
	},
	"args": ["sse", "-m", "http://mesos-master:8080", "-m", "http://mesos-agent:8080", "-m", "http://mesos-agent-1:8080", "--group", "external"]
}