Update fedora.md

Docker-DCO-1.1-Signed-off-by: Alexander Shopov <ash@kambanaria.org> (github: alshopov)

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Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)

replaces #6478

Docker-DCO-1.1-Signed-off-by: Alexander Shopov <ash@kambanaria.org> (github: )

docs/sources/installation/fedora.md

@@ -48,6 +48,44 @@ Now let's verify that Docker is working.
 
     $ sudo docker run -i -t fedora /bin/bash
 
+## Granting rights to users to use Docker
+
+Fedora 19 and 20 shipped with Docker 0.11. The package has already been updated
+to 1.0 in Fedora 20. If you are still using the 0.11 version you will need to
+grant rights to users of Docker.
+
+The `docker` command line tool contacts the `docker` daemon process via a
+socket file `/var/run/docker.sock` owned by group `docker`. One must be 
+member of that group in order to contact the `docker -d` process.
+
+    $ usermod -a -G docker login_name
+
+Adding users to the `docker` group is *not* necessary for Docker versions 1.0
+and above.
+
+## HTTP Proxy
+
+If you are behind a HTTP proxy server, for example in corporate settings, 
+you will need to add this configuration in the Docker *systemd service file*.
+
+Edit file `/lib/systemd/system/docker.service`. Add the following to
+section `[Service]` :
+
+    Environment="HTTP_PROXY=http://proxy.example.com:80/"
+
+If you have internal Docker registries that you need to contact without
+proxying you can specify them via the `NO_PROXY` environment variable:
+
+    Environment="HTTP_PROXY=http://proxy.example.com:80/" "NO_PROXY=localhost,127.0.0.0/8,docker-registry.somecorporation.com"
+
+Flush changes:
+
+    $ systemctl daemon-reload
+    
+Restart Docker:
+
+    $ systemctl start docker
+
 ## What next?
 
 Continue with the [User Guide](/userguide/).