PortMap

PortMap describes the mapping of container ports to host ports, using the
container's port-number and protocol as key in the format <port>/<protocol>,
for example, 80/udp.

If a container's port is mapped for both tcp and udp, two separate
entries are added to the mapping table.

{
    "2377/tcp": null,
    "443/tcp": [
        {
            "HostIp": "127.0.0.1",
            "HostPort": "4443"
        }
    ],
    "53/udp": [
        {
            "HostIp": "0.0.0.0",
            "HostPort": "53"
        }
    ],
    "80/tcp": [
        {
            "HostIp": "0.0.0.0",
            "HostPort": "80"
        },
        {
            "HostIp": "0.0.0.0",
            "HostPort": "8080"
        }
    ],
    "80/udp": [
        {
            "HostIp": "0.0.0.0",
            "HostPort": "80"
        }
    ]
}