docker public ip

[sese]

You should consider also the new sintax to retrieve the public IP.

$ docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $INSTANCE_ID

I use Docker version 17.12.0-ce and the old method is not working anymore, returns null

$ docker inspect --format '{{ .NetworkSettings.IPAddress }}' $INSTANCE_ID

Please check Docker Docs