docs: move a sysadmin-focused topic out of the basic usage manual and into installation docs (setting up a user group for non-root access)

docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)

docs/sources/installation/binaries.rst

@@ -57,6 +57,28 @@ Run the docker daemon
     # start the docker in daemon mode from the directory you unpacked
     sudo ./docker -d &
 
+
+.. _dockergroup:
+
+Giving non-root access
+----------------------
+
+The ``docker`` daemon always runs as the root user, and since Docker version
+0.5.2, the ``docker`` daemon binds to a Unix socket instead of a TCP port. By
+default that Unix socket is owned by the user *root*, and so, by default, you
+can access it with ``sudo``.
+
+Starting in version 0.5.3, if you (or your Docker installer) create a
+Unix group called *docker* and add users to it, then the ``docker``
+daemon will make the ownership of the Unix socket read/writable by the
+*docker* group when the daemon starts. The ``docker`` daemon must
+always run as the root user, but if you run the ``docker`` client as a user in
+the *docker* group then you don't need to add ``sudo`` to all the
+client commands.  
+
+.. warning:: The *docker* group is root-equivalent.
+
+
 Upgrades
 --------
 

docs/sources/installation/ubuntulinux.rst

@@ -167,7 +167,43 @@ Type ``exit`` to exit
 
 **Done!**, now continue with the :ref:`hello_world` example.
 
-Upgrades
+
+Giving non-root access
+----------------------
+
+The ``docker`` daemon always runs as the root user, and since Docker version
+0.5.2, the ``docker`` daemon binds to a Unix socket instead of a TCP port. By
+default that Unix socket is owned by the user *root*, and so, by default, you
+can access it with ``sudo``.
+
+Starting in version 0.5.3, if you (or your Docker installer) create a
+Unix group called *docker* and add users to it, then the ``docker``
+daemon will make the ownership of the Unix socket read/writable by the
+*docker* group when the daemon starts. The ``docker`` daemon must
+always run as the root user, but if you run the ``docker`` client as a user in
+the *docker* group then you don't need to add ``sudo`` to all the
+client commands.  
+
+.. warning:: The *docker* group is root-equivalent.
+
+**Example:**
+
+.. code-block:: bash
+
+  # Add the docker group if it doesn't already exist.
+  sudo groupadd docker
+
+  # Add the connected user "${USER}" to the docker group.
+  # Change the user name to match your preferred user.
+  # You may have to logout and log back in again for
+  # this to take effect.
+  sudo gpasswd -a ${USER} docker
+
+  # Restart the docker daemon.
+  sudo service docker restart
+
+
+Upgrade
 --------
 
 To install the latest version of docker, use the standard ``apt-get`` method:

docs/sources/use/basics.rst

@@ -18,10 +18,10 @@ your docker install, run the following command:
     docker info
 
 If you get ``docker: command not found`` or something like
-``/var/lib/docker/repositories: permission denied`` you have an incomplete
-docker installation. Please refer to :ref:`installation_list` for installation
-instructions.
+``/var/lib/docker/repositories: permission denied`` you may have an incomplete
+docker installation or insufficient privileges to access docker on your machine.
 
+Please refer to :ref:`installation_list` for installation instructions.
 
 Download a pre-built image
 --------------------------
@@ -52,42 +52,6 @@ Running an interactive shell
   # use the escape sequence Ctrl-p + Ctrl-q
   sudo docker run -i -t ubuntu /bin/bash
 
-.. _dockergroup:
-
-The sudo command and the docker Group
--------------------------------------
-
-The ``docker`` daemon always runs as the root user, and since Docker version
-0.5.2, the ``docker`` daemon binds to a Unix socket instead of a TCP port. By
-default that Unix socket is owned by the user *root*, and so, by default, you
-can access it with ``sudo``.
-
-Starting in version 0.5.3, if you (or your Docker installer) create a
-Unix group called *docker* and add users to it, then the ``docker``
-daemon will make the ownership of the Unix socket read/writable by the
-*docker* group when the daemon starts. The ``docker`` daemon must
-always run as the root user, but if you run the ``docker`` client as a user in
-the *docker* group then you don't need to add ``sudo`` to all the
-client commands.  
-
-.. warning:: The *docker* group is root-equivalent.
-
-**Example:**
-
-.. code-block:: bash
-
-  # Add the docker group if it doesn't already exist.
-  sudo groupadd docker
-
-  # Add the connected user "${USER}" to the docker group.
-  # Change the user name to match your preferred user.
-  # You may have to logout and log back in again for
-  # this to take effect.
-  sudo gpasswd -a ${USER} docker
-
-  # Restart the docker daemon.
-  sudo service docker restart
-
 .. _bind_docker:
 
 Bind Docker to another host/port or a Unix socket