No way to differentiate between IPV4/IPV6 Port Mapptings

[vincentjames501]

Summary

Right now with the Task metadata endpoint version 4 API, there is no way to differentiate which Ports are for ipv4/ipv6.

References:
#2870
#3025

Description

We are now getting ipv4 & ipv6 ports when we were previously just getting ipv4.

We are now getting the following when querying the ECS task metadata endpoint:

$ curl http://169.254.170.2/v4/c8739a8c-7d64-44e0-8600-427ca273f031/task | jq

{
...
      "Ports": [
        {
          "ContainerPort": 8888,
          "Protocol": "tcp",
          "HostPort": 49832
        },
        {
          "ContainerPort": 8888,
          "Protocol": "tcp",
          "HostPort": 49825
        }
      ],
...
}

Note docker inspect will show the HostIp:

$ sudo docker inspect 8507b80d2320

{...
            "Ports": {
                "10000/tcp": null,
                "8888/tcp": [
                    {
                        "HostIp": "0.0.0.0",
                        "HostPort": "49832"
                    },
                    {
                        "HostIp": "::",
                        "HostPort": "49825"
                    }
                ]
            },
...
}

Expected Behavior

Ideally I'd love for there to be a way to differentiate these. Can we just expose HostIp such that this:

{
          "ContainerPort": 8888,
          "Protocol": "tcp",
          "HostPort": 49832
},

Would become:

{
          "ContainerPort": 8888,
          "Protocol": "tcp",
          "HostPort": 49832,
          "HostIp": "0.0.0.0"
},

This would give API clients the ability to differentiate easily between them.

Observed Behavior

There is no way to distinguish between the two via the task metadata endpoint v4.

Environment Details

ECS

"Version":"Amazon ECS Agent - v1.56.0 (174ace6d)"

Docker

Client:
 Version:           20.10.7

[mythri-garaga]

Hi @vincentjames501,

Thank you for reporting this, we will take a look at this.

[mythri-garaga]

Closing this issue as it is addressed in #3112.