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Remove ntpdate.

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Re-clarify servers' response section.

Submitted by: bjk, imp
Sponsored by: iXsystems
This commit is contained in:
Dru Lavigne 2014-02-03 21:47:48 +00:00
parent 29c61ac6da
commit 826e94e1fc
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=43740
1 changed files with 7 additions and 20 deletions
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27
en_US.ISO8859-1/books/handbook/network-servers/chapter.xml
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@ -5266,31 +5266,18 @@ Starting smbd.</screen>
<indexterm><primary>NTP</primary> <indexterm><primary>NTP</primary>
<secondary>ntp.conf</secondary> <secondary>ntp.conf</secondary>
<tertiary>ntpdate</tertiary>
</indexterm> </indexterm>
<para>To only synchronize the clock when a system boots, use <para>On &os;, the built-in <application>ntpd</application> can
&man.ntpdate.8;. This alone can be appropriate for desktops be used to synchronize a system's clock. To enable <application>ntpd</application> at boot time,
which are frequently rebooted. However, most systems should add <literal>ntpd_enable="YES"</literal> to
run <application>ntpdate</application> at boot time as well as
configure <application>ntpd</application>. This is because
<application>ntpd</application> changes the clock gradually,
whereas <application>ntpdate</application> sets the clock, no
matter how great the difference between a machine's current
clock setting and the correct time.</para>
<para>To enable <application>ntpdate</application> at boot time,
add <literal>ntpdate_enable="YES"</literal> to
<filename>/etc/rc.conf</filename>. To also enable
<application>ntpd</application>, add the
<literal>ntpd_enable="YES"</literal> entry to
<filename>/etc/rc.conf</filename>. Additional variables can <filename>/etc/rc.conf</filename>. Additional variables can
be specified in <filename>/etc/rc.conf</filename>. Refer to be specified in <filename>/etc/rc.conf</filename>. Refer to
&man.rc.conf.5;, &man.ntpdate.8;, and &man.ntpd.8; for &man.rc.conf.5; and &man.ntpd.8; for
details.</para> details.</para>
<para>Both applications read <filename>/etc/ntp.conf</filename> <para>This application reads <filename>/etc/ntp.conf</filename>
to determine which servers to query. Here is a simple example to determine which <acronym>NTP</acronym> servers to query. Here is a simple example
of an <filename>/etc/ntp.conf</filename>:</para> of an <filename>/etc/ntp.conf</filename>:</para>
<example> <example>
@ -5309,7 +5296,7 @@ driftfile /var/db/ntp.drift</programlisting>
entry includes <literal>prefer</literal>, that server is entry includes <literal>prefer</literal>, that server is
preferred over other servers. A response from a preferred preferred over other servers. A response from a preferred
server will be discarded if it differs significantly from server will be discarded if it differs significantly from
responses; otherwise it will be used. The other servers' responses; otherwise it will be used. The
<literal>prefer</literal> argument should only be used for <literal>prefer</literal> argument should only be used for
<acronym>NTP</acronym> servers that are known to be highly <acronym>NTP</acronym> servers that are known to be highly
accurate, such as those with special time monitoring accurate, such as those with special time monitoring