docker-proxy using port when no containers are running

Try:

sudo service docker stop sudo rm -f /var/lib/docker/network/files/local-kv.db

From this ticket.

This worked for me on Linux, and without having to delete any resources.

# Stop docker
sudo service docker stop

# Find your particular zombie proxy processes
sudo netstat -pna | grep docker-proxy
# tcp6       0      0 :::8025       :::*     LISTEN      <PID_A>/docker-proxy  
# tcp6       0      0 :::13306      :::*     LISTEN      <PID_B>/docker-proxy
# ...

# Kill them
sudo kill -9 PID_A PID_B ...

# restart
sudo service docker start