<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude" version="5.0" xml:id="ha-aa-controllers"> <info> <title>OpenStack controller nodes</title> </info> <simpara>OpenStack controller nodes contain:</simpara> <itemizedlist> <listitem> <simpara> All OpenStack API services </simpara> </listitem> <listitem> <simpara> All OpenStack schedulers </simpara> </listitem> <listitem> <simpara> Memcached service </simpara> </listitem> </itemizedlist> <xi:include href="./ha_aa_controllers/section_run_openstack_api_and_schedulers.xml"/> <xi:include href="./ha_aa_controllers/section_memcached.xml"/> </chapter>