Update of /cvsroot/leaf/doc/guide/user-bering-uclibc
In directory sc8-pr-cvs6.sourceforge.net:/tmp/cvs-serv16181
Modified Files:
book.xml
Added Files:
bucu-ntp.xml
Log Message:
new chapter for openntpd
--- NEW FILE: bucu-ntp.xml ---
<?xml version="1.0" encoding="UTF-8"?>
<chapter id="bucu-ntp">
<title>Configure a timeserver on LEAF Bering-uClibc</title>
<section>
<title>Objective</title>
<para>This instructions explain, how to make shure, you have the exact
time (UTC) on your router and to act as a timeserver for the local net. We
use openntpd, a very small ntp package, to achieve that goals.</para>
<para>It is assumed, that you have a basic knowledge about how add
packages, edit and save files with Bering-uClibc.</para>
</section>
<section>
<title>Installing and configuring openntpd</title>
<para><citation>OpenNTPD is a FREE, easy to use implementation of the
Network Time Protocol. It provides the ability to sync the local clock to
remote NTP servers and can act as NTP server itself, redistributing the
local clock.</citation></para>
<para>The openntpd package has been provided on the ISO images and
packages page for quite a while. Beginning with Bering-uClibc v3.1
openntpd has been added to the floppy images as a feature-enhanced
replacement for rdate.</para>
<para>If you do not use a new floppy image, you'll have to add the
openntpd package to your boot media and add it to the packages list in
<filename>leaf.cfg</filename>. You can now either reboot and configure
later, or install the package (apkg -i), configure it and save the
configuration.</para>
<para>There are the two configuration files
<filename>/etc/default/openntpd</filename> and
<filename>/etc/openntpd/ntpd.conf.</filename></para>
<para>In the first file the start options of openntpd are defined. The
default for the Bering-uClibc package is "-s", which sets the time
immediately at startup if the local clock is off by more than 180 seconds.
Allows for an unusual large time correction.</para>
<para>All other start options are documented in the man page for ntpd,
available for online reading on the openntpd web pages.</para>
<para>In the second configuration file,
<filename>/etc/openntpd/ntpd.conf</filename>, you can define the server(s)
you take the time off and the network (adresses) the ntpd daemon listens
to (which means: the network (adresses) ntpd acts as server to requests by
clients asking for the exact time).</para>
<para>It's a good idea to sync the time with the pool of stratum 2
timeservers <ulink
url="http://twiki.ntp.org/bin/view/Servers/NTPPoolServers";>pool.ntp.org</ulink>.
This setting is default, and usually there is no need to change
it.<screen># use a random selection of 8 public stratum 2 servers
# see http://twiki.ntp.org/bin/view/Servers/NTPPoolServers
servers pool.ntp.org</screen></para>
<para>If you want to serve the exact time you get from pool.ntp.org (or
whatever time service you haven choosen) to your local network, you have
to add the ip address of the local interface in the with the keyword
"listen". <screen># Addresses to listen on (ntpd does not listen by default)
#listen on *
#listen on 127.0.0.1
#listen on ::1
listen 192.168.1.254</screen>You can add more than one interface if you have
more than one net you want to serve with time.</para>
</section>
<section>
<title>Open your firewall for time services</title>
<para>openntpd needs open ports for ntp from the firewall to the net, to
sync your router with the pool of stratum servers on the net, and to allow
a connection from your LAN clients to your timeserver on the
router.</para>
<para>The first one is open by default with recent versions of
Bering-uClibc, to allow access from the LAN to the firewall/router you
have to outcomment the according entry in
<filename>/etc/shorewall/rules.</filename></para>
<para><screen># timeserver (allow syncing with time servers (default:
pool.ntp.org))
NTP/ACCEPT fw net
# timeserver (allow LAN clients to sync with the time service on this machine) )
# NTP/ACCEPT loc fw</screen></para>
</section>
<section>
<title>Further readings</title>
<para>For more information see:<orderedlist>
<listitem>
<para><ulink url="http://www.ntp.org";>ntp.org</ulink> - the home of
the Network Time Protocol project with an extensive
documentation.</para>
</listitem>
<listitem>
<para><ulink url="http://www.ntp.org/ntpfaq/NTP-a-faq.htm";>The NTP
FAQ and HOWTO</ulink> - "A first try on a non-technical Mini-HOWTO
and FAQ on NTP"</para>
</listitem>
<listitem>
<para><ulink url="http://www.openntpd.org";>openntpd.org</ulink> -
the home of openntpd with some specific documentation (incl. the man
page).</para>
</listitem>
</orderedlist></para>
</section>
</chapter>
Index: book.xml
===================================================================
RCS file: /cvsroot/leaf/doc/guide/user-bering-uclibc/book.xml,v
retrieving revision 1.28
retrieving revision 1.29
diff -C2 -d -r1.28 -r1.29
*** book.xml 25 Nov 2006 04:15:34 -0000 1.28
--- book.xml 3 Feb 2007 17:56:49 -0000 1.29
***************
*** 10,13 ****
--- 10,15 ----
<xi:include href="bucu-ezipupd.xml"
xmlns:xi="http://www.w3.org/2001/XInclude"; />
+ <xi:include href="bucu-ntp.xml"
+ xmlns:xi="http://www.w3.org/2001/XInclude"; />
<xi:include href="bucu-ipv6.xml"
xmlns:xi="http://www.w3.org/2001/XInclude"; />
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