Removed sqlite from docs

Change-Id: I002606a43eae507c9f0b44db83a7d8994cad2cb5
Closes-Bug: #1357062

doc/source/userdoc/configuration.guide.rst

@@ -12,22 +12,14 @@ based on the basic sample, as most probably changing parameters listed here
 will be enough.
 
 First, edit ``connection`` parameter in the ``[database]`` section. The URL
-provided here should point to an empty database. In case of SQLite, if the
-database file does not exist, it will be automatically created
-by ``sahara-db-manage``. For instance, the following URL should work in
-most environments:
+provided here should point to an empty database. For instance, connection
+string for mysql database will be:
 
 .. sourcecode:: cfg
 
-    connection=sqlite:////tmp/sahara.db
+    connection=mysql://username:password@host:port/database
 ..
 
-Note that we recommend using MySQL or PostgreSQL backends for setups
-other than experimental. This is especially important if you plan to
-migrate later to a newer version of Sahara. With SQLite you will
-either have to start from scratch or migrate your DB to MySQL or
-PostgreSQL, which might be non-trivial.
-
 Switch to the ``[keystone_authtoken]`` section. The ``auth_uri`` parameter
 should point to the public Identity API endpoint. ``identity_uri`` should
 point to the admin Identity API endpoint. For example:

doc/source/userdoc/upgrade.guide.rst

@@ -28,9 +28,12 @@ old config opts with the new ones.
 * ``os_admin_tenant_name`` -> ``[keystone_authtoken]/admin_tenant_name``
 
 We've replaced oslo code from sahara.openstack.common.db by usage of oslo.db
-library. Default sqlite db name was changed as follows.
+library.
 
-* ``sahara.sqlite`` -> ``oslo.sqlite``
+Also sqlite database is not supported anymore. Please use MySQL or PostgreSQL
+db backends for Sahara. Sqlite support was dropped because it doesn't support
+(and not going to support, see http://www.sqlite.org/omitted.html) ALTER
+COLUMN and DROP COLUMN commands required for DB migrations between versions.
 
-You can find more info about config file options in sahara repository in file
+You can find more info about config file options in Sahara repository in file
 ``etc/sahara/sahara.conf.sample``.

sahara/db/api.py

@@ -27,7 +27,7 @@ interface.
               `sqlalchemy` is the only supported backend right now.
 
 :sql_connection:  string specifying the sqlalchemy connection to use, like:
-                  `sqlite:///var/lib/sahara/sahara.sqlite`.
+                  `mysql://user:password@localhost/sahara`.
 
 """