title: docker-proxy using port when no containers are running
body: <p>On a ubunty 1404 machine, docker-proxy is using port 6379, however there are no docker containers running.</p>
  
  <pre><code>$ sudo netstat -tulpn | grep docker    
  tcp6       0      0 :::6379                 :::*                    LISTEN      28438/docker-proxy
  tcp6       0      0 :::2376                 :::*                    LISTEN      28266/dockerd
  $ docker ps -all
  CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS       PORTS               NAMES
  $
  </code></pre>
  
  <p>After I stop docker service, this process is gone, and that port is available, however when I start docker back up, docker-proxy is still using that port even though there are no docker containers running.</p>
  
  <pre><code>$ docker info
  ## Output:
  Containers: 0
   Running: 0
   Paused: 0
   Stopped: 0
  Images: 0
  Server Version: 1.12.0
  Storage Driver: aufs
   Root Dir: /var/lib/docker/aufs
   Backing Filesystem: extfs
   Dirs: 0
   Dirperm1 Supported: true
  Logging Driver: json-file
  Cgroup Driver: cgroupfs
  Plugins:
   Volume: local
   Network: bridge null host overlay
  Swarm: inactive
  Runtimes: runc
  Default Runtime: runc
  Security Options: apparmor
  Kernel Version: 4.2.0-38-generic
  Operating System: Ubuntu 14.04.4 LTS
  OSType: linux
  Architecture: x86_64
  CPUs: 16
  Total Memory: 31.32 GiB
  Name: xxxxx
  ID: LILE:5WFT:2EPL:OXCN:GZG7:C4WE:AFCX:LNAT:TBMG:XQFP:QX7W:XLYK
  Docker Root Dir: /var/lib/docker
  Debug Mode (client): false
  Debug Mode (server): false
  Registry: https://index.docker.io/v1/
  WARNING: No swap limit support
  Insecure Registries:
   127.0.0.0/8
  </code></pre>