en-US/hypervisor-host-install-prepare-os.xml

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<section id="hypervisor-host-install-prepare-os">
    <title>Prepare the Operating System</title>
    <para>The OS of the Host must be prepared to host the &PRODUCT; Agent and run KVM instances.</para>
    <orderedlist>
        <listitem><para>Log in to your OS as root.</para></listitem>
        <listitem>
            <para>Check for a fully qualified hostname.</para>
            <programlisting language="Bash"><command>$ hostname --fqdn</command></programlisting>
            <para>This should return a fully qualified hostname such as "kvm1.lab.example.org".  If it does not, edit /etc/hosts so that it does.</para>
        </listitem>
        <listitem>
            <para>Make sure that the machine can reach the Internet.</para>
            <programlisting language="Bash"><command>$ ping www.cloudstack.org</command></programlisting>
        </listitem>
        <listitem>
            <para>Turn on NTP for time synchronization.</para>
            <note><para>NTP is required to synchronize the clocks of the servers in your cloud. Unsynchronized clocks can cause unexpected problems.</para></note>
                <orderedlist numeration="loweralpha">
                    <listitem><para>Install NTP</para>
                        <para condition="community">On RHEL or CentOS:</para>
                        <programlisting language="Bash"><command>$ yum install ntp</command></programlisting>
                        <para condition="community">On Ubuntu:</para>
                        <programlisting language="Bash"><command>$ apt-get install openntpd</command></programlisting>
                    </listitem>
                </orderedlist>
        </listitem>
        <listitem><para>Repeat all of these steps on every hypervisor host.</para></listitem>
    </orderedlist>
</section>