Docker inspect format retrieve port mapping

Question

I'd like to retrieve the port mapped to a container using docker inspect, I found something like that:

docker inspect --format=" {{ .NetworkSettings.Ports }} " containerid

Output:

map[1234/tcp:[map[HostIp:0.0.0.0 HostPort:49159]] 3306/tcp:<nil> 4444/tcp:<nil> 4567/tcp:<nil> 4568/tcp:<nil>]

But I'd like to have an output like this:

1234/tcp:49159

Is it possible ?

Answer 1

The docker port command may be more useful; it produces output like this:

$ docker port 0a7b4df54966
443/tcp -> 0.0.0.0:4430
80/tcp -> 0.0.0.0:8888

Answer 2

You can use index in your template:

--format '1234/tcp:{{ (index (index .NetworkSettings.Ports "1234/tcp") 0).HostPort }}'

Answer 3

See also my answer How to get ENV variable when doing Docker Inspect I guess you can adapt and get directly what you want