xCAT uses the SQLite database (https://www.sqlite.org/) as the default database and it is initialized during xCAT installation of the Management Node. If using Service Nodes, SQLite cannot be used because Service Nodes require remote access to the xCAT database. One of the following databases should be used:
mysql_reference_labelpostgresql_reference_label
mysql_install.rst mysql_configure.rst mysql_using.rst mysql_remove.rst
postgres_install.rst postgres_configure.rst postgres_using.rst postgres_remove.rst