Modify doc from victor's comments

docs/source/guides/admin-guides/large_clusters/databases/mysql_configure.rst

@@ -11,11 +11,15 @@ The following utility is provided to migrate an existing xCAT database from SQLi
 
 If you need to update the database at a later time to give access to your service nodes, you can use the ``mysqlsetup -u -f`` command.  A file needs to be provided with all the hostnames and/or IP addresses of the servers that need to access the database on the Management node. Wildcards can be used. ::
 
-        cat /path/to/file1
-          service1
-          10.1.1.1 
+        mysqlsetup -u -f /tmp/servicenodes
 
-        mysqlsetup -u -f /path/to/file1
+where the /tmp/servicenodes contains a host per line: ::
+
+    cat /tmp/servicenodes
+      node1
+      1.115.85.2
+      10.%.%.%
+      node2.cluster.net
 
 **While not recommended**, if you wish to manually migrate your xCAT database, see the following documentation: 
 `Manually set up MySQL <https://sourceforge.net/p/xcat/wiki/Setting_Up_MySQL_as_the_xCAT_DB/#configure-mysql-manually>`_

docs/source/guides/admin-guides/large_clusters/databases/mysql_remove.rst

@@ -1,39 +1,43 @@
 Removing ``xcatdb`` from MySQL/MariaDB
 ======================================
 
-To remove ``xcatdb`` completely from the MySQL/MariaDB database:
+For some reason, if you do not want to use MySQL/MariaDB to maintain ``xcatdb``, and like to switch to PostgreSQL or just default SQLite ( **Note:** SQLite does not support xCAT Hierarchy (has service nodes)), you can always to do that with the xCAT command.
 
-#. Run a backup of the database to save any information that is needed: ::
+*  Run a backup of the database to save any information that is needed (optional): ::
 
       mkdir -p ~/xcat-dbback
       dumpxCATdb -p ~/xcat-dbback
 
-#. Stop the ``xcatd`` daemon on the management node.  
-   **Note:** If you are using *xCAT Hierarchy (service nodes)* and removing ``xcatdb`` from MySQL/MariaDB, hierarchy will no longer work. You will need to configure another database which supports remote database access to continue using the hierarchy feature. ::
-
-      service xcatd stop
-
-#. Remove the ``xatdb`` from MySQL/MariaDB: :: 
-
-     /usr/bin/mysql -u root -p 
-
-   drop the xcatdb: ::
-
-      mysql> drop database xcatdb;
-
-   remove the xcatadm database owner : ::
-
-      mysql> drop user xcatadm;
-
-#. Move, or remove, the  ``/etc/xcat/cfglog`` file as it points xCAT to MySQL/MariaDB.  (without this file, xCAT defaults to SQLite): ::
-   
-      mv /etc/xcat/cfgloc /etc/xcat/cfglog.mysql
-
-#. Restore the MySQL/MariaDB database into SQLite: ::
+   If you want to restore this database: ::
 
       XCATBYPASS=1 restorexCATdb -p ~/xcat-dbback
 
-#. Restart ``xcatd``: ::
+*  Change to PostgrSQL, please follow link https://xcat-docs.readthedocs.org/en/latest/guides/admin-guides/large_clusters/databases/postgres_install.html
+
+
+*  Change to default SQLite (**Note**:  xCAT Hierarchy cluster will no longer work)
+
+  #. Stop the ``xcatd`` daemon on the management node. :: 
+
+      service xcatd stop
+
+  #. Remove the ``xatdb`` from MySQL/MariaDB (optional): :: 
+
+      /usr/bin/mysql -u root -p 
+
+     drop the xcatdb: ::
+
+       mysql> drop database xcatdb;
+
+     remove the xcatadm database owner : ::
+
+       mysql> drop user xcatadm;
+
+  #. Move, or remove, the  ``/etc/xcat/cfglog`` file as it points xCAT to MySQL/MariaDB.  (without this file, xCAT defaults to SQLite): ::
+   
+      rm /etc/xcat/cfgloc 
+
+  #. Restart ``xcatd``: ::
 
       service xcatd start 
 

docs/source/guides/admin-guides/large_clusters/databases/mysql_using.rst

@@ -20,8 +20,8 @@ Start/Stop MySQL/MariaDB service
     service mysql stop
 
 
-Basic mysql commands 
---------------------------------------
+Basic MySQL/MariaDB commands 
+-----------------------------
 
 Refer to `<https://www.mariadb.org/>`_ for the latest documentation.