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=====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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