Support for labels?

[lox]

Had you thought about the possibility of using container labels and dns?

[tianon]

Hmm, interesting idea. How do you envision this working? Some kind of rawdns-specific label for giving containers alternate names, especially multiple containers under the same name?

[josegonzalez]

This might be nice to do if we could specify something like the following:

{
	"docker.": {
		"type": "containers",
		"socket": "unix:///var/run/docker.sock",
                "label": "rawdns.hostname"
	}
}

Using this method, if we define two containers like so:

# container 1
docker run --label rawdns.hostname=web IMAGE
# container 2
docker run --name web IMAGE

If a user requests web.docker, the IP of container 1 would be returned (most specific one wins).

If we have two or more containers with the same label, the IPs for both would be returned.

[tianon]

One challenge with that is that the way rawdns works is that a DNS request is translated directly to what's essentially a docker inspect call on the specific container name requested -- dealing with labels makes that a more complicated lookup (and one which then has the potential to match multiple containers).

FWIW, I'm still very interested in exploring #26 which would make this easier for other folks to implement/play with (and I think the example linked there already supports something related to container labels, in fact).