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--- user:ryoung12:portfolio:ntp:client [2010/05/20 20:21] – ryoung12
+++ user:ryoung12:portfolio:ntp:client [2010/05/21 20:58] (current) – ryoung12
@@ Line 1: / Line 1: @@
+=====Configuring a NTP Client on a Virtual Machine=====
+<html><p style="margin:0em; padding:0em;">Again, you need to edit <span style="font-style:italic; font-weight:bold;">/etc/ntp.conf</span> using the editor of your choice to tailor things to your needs.</p></html>
+<cli>
+sudo vim /etc/ntp.conf
+</cli>
+<html><p style="margin:0em; padding:0em;">The ntp.conf file on our client is as follows:</p></html>
+<code bash>
+# /etc/ntp.conf
+# Disable the panic threshold to allow irregular clock offsets
+tinker panic 0
+# Local clock oscillation file
+driftfile /var/lib/ntp/ntp.drift
+# Allow statistics to be logged.
+statsdir /var/log/ntpstats/
+# Logging configuration
+statistics loopstats peerstats clockstats
+filegen loopstats file loopstats type day enable
+filegen peerstats file peerstats type day enable
+filegen clockstats file clockstats type day enable
+# Access control configuration
+restrict default kod nomodify notrap nopeer noquery # Deny everybody by default
+restrict 127.0.0.1                                  # Allow unrestricted access to self
+# NTP servers to syncronise with
+server vmserver03.student.lab
+</code>
+<html><p style="margin:0em; padding:0em;"> The main difference between our client and our server ntp.conf files is that the client file does not have a restrict directive that allows it to serve time to other systems. It also does not look to itself as a server.<br />
+We need to do some additional configuration before we restart the NTP service to apply the changes on our virtual macines.</p></html>
+====Special Settings for Virtual Machines====
+<html><p style="margin:0em; padding:0em;">Because the NTP clients for the purposes of this portfolio will be used on Xen Virtual  Machines, a few special configuration enhancements need to be made. The first, is the line <span style="font-style:italic;">tinker panic 0</span> from our client version of the ntp.conf. This allows the NTP client to update from the NTP server, regardless of differences in current system time -- there are instances where the VM will begin adjusting it's clock automatically due to various system errors. The other requirement is to create a <span style="font-style:italic; font-weight:bold;">step-tinkers</span> file and place it in <span style="font-style:italic; font-weight:bold;">/etc/ntp</span> directory. (You may need to create this directory as it is not created by default as part of the installation process for NTP.)</p></html>
+<cli>
+sudo sh -c "mkdir /etc/ntp && vim /etc/ntp/step-tinkers"
+</cli>
+<code bash>
+# /etc/ntp/step-tinkers
+vmserver03.student.lab
+</code>
+\\
+<html><p style="margin:0em; padding:0em;">Restart the NTP service to implement the changes.</p></html>
+<cli>
+sudo /etc/init.d/ntp restart
+</cli>

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