When using Docker, ESTABLISHED connections don't appear in netstat

Question

I have a docker container running on RHEL 7 with Docker 1.7.0. The program which running in this container listens for TCP connections on port 5000. In my Dockerfile I put t

Answer 1

You can either do:

docker exec  netstat -tan | grep ESTABLISHED

or if you don't have netstat in your docker image:

docker inspect -f '{{.State.Pid}}'  # note the PID
sudo nsenter -t  -n netstat | grep ESTABLISHED

nsenter is part of util-linux package. (plagiarized @larsks)