Describes sample architectures

Subsequent patches should try to write to those architectures.

Fixes typo.

Change-Id: I9a1c3697f81237fbc352fae767123356e356dcaa

doc/install-guide/ch_basics.xml

@@ -247,7 +247,7 @@ hwclock -w</programlisting>
     <title>OpenStack Packages</title>
 
     <para>
-      Distributions releases and OpenStack releases are independend of
+      Distributions releases and OpenStack releases are independent of
       each other and thus you might need to add some extra steps to access
       the latest OpenStack release after installation of the machine before
       installation of any OpenStack packages.

doc/install-guide/ch_overview.xml

@@ -16,7 +16,60 @@
   </section>
 
   <section xml:id="overview-architecture">
-    <title>Sample Architecture</title>
-   <para> <!-- FIXME --></para>
+    <title>Sample Architectures</title>
+   <para>This guide is written so that you can choose your own
+      OpenStack adventure. Because OpenStack is highly configurable to
+      meet different use cases, with many storage choices and
+      underlying software-defined networking scenarios, this guide
+      offers these main examples with the intention of expanding on
+      each: </para>
+    <itemizedlist>
+      <listitem>
+        <para>Example architecture for simplicity:  the most basic
+   architecture you can have: one node to run the "control" services, such
+   as database, message queue and API services for the Identity Service,
+   Image Service and Compute Service; and a second node to be our
+   Compute node that runs the hypervisor where our virtual machines will live.</para>
+  <figure xml:id="basic-architecture">
+  <title>Basic Architecture</title>
+  <mediaobject>
+    <imageobject>
+      <imagedata contentwidth="6in" fileref="figures/basic-architecture.svg"/>
+    </imageobject>
+  </mediaobject>
+  </figure>
+         <para os="fedora;rhel;centos">Technical details: Compute with KVM,
+          local ephemeral storage, nova-networks in multi-host flatDHCP,
+          MySQL, nova-api, default scheduler, Qpid for messaging,
+          Identity with SQL backend, Image with local storage,
+          Dashboard (optional extra). Use as many default options as possible.
+          </para>
+         <para os="ubuntu;debian;opensuse">Technical details: Compute with KVM,
+          local ephemeral storage, nova-networks in multi-host flatDHCP,
+          MySQL, nova-api, default scheduler, RabbitMQ for messaging,
+          Identity with SQL backend, Image with local storage, Dashboard (optional extra).
+          Use as many default options as possible.
+          </para>
+      </listitem>
+      <listitem>
+        <para>Example architecture from the OpenStack Operations
+          Guide: Same as above but with Block Storage backend
+          LVM/iSCSI, nova-network in multi-host with FlatDHCP, Live
+          Migration backend shared storage with NFS, and Object
+          Storage. One controller node and multiple compute
+          nodes.</para>
+      </listitem>
+      <listitem>
+        <para>Example architecture with Identity and Object Storage
+          only (no Dashboard): Five node installation with Identity on
+          the proxy node and three replications of object servers.
+          Dashboard does not support this configuration so examples
+          are with CLI.</para>
+      </listitem>
+      <listitem>
+        <para>Example architecture with OpenStack Networking
+          (Neutron)</para>
+      </listitem>
+    </itemizedlist>
   </section>
 </chapter>