Adding Fabric overview and example

docs/scenarios/admin.rst

@@ -4,7 +4,41 @@ Systems Administration
 Fabric
 ------
 
-.. todo:: Write about Fabric
+Fabric is a library for simplifying system administration tasks. While Chef
+and Puppet tend to focus on managing servers and system libraries,
+fabric is more focused on application level tasks such as deployment.
+
+Install Fabric:
+
+::
+
+    pip install fabric
+
+The following code will ssh into both of our servers, cd to our project
+directory, activate the virtual environment, pull the newest codebase,
+and restart the application server.
+
+::
+
+    from fabric.api import env, cd, run, prefix
+
+    env.hosts = ['my_server1', 'my_server2']
+
+    def deploy():
+        with cd('/var/www/project-env/project'):
+            with prefix('. ../bin/activate'):
+                run('git pull')
+                run('touch app.wsgi')
+
+With the previous code saved in a file named fabfile.py, we merely need to run
+the following command to deploy our application to both of our servers.
+
+::
+
+    $ fab deploy
+
+Additional features include parallel execution, interaction with remote
+programs, and host grouping.
 
 Chef
 ----