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NTP

• This document covers the compilation, installation and basic configuration of an NTP client and server for Linux. More advanced configuration is in online documents. A good place to start is the NTP website.
• If you install this software it is highly recommended that you keep up-to-date with any security advisories published in regard to this software.
• If you spot any major errors on this page, please e-mail me using the link above.

• It is assumed that this installation takes place on a computer on which Core Linux has been successfully installed.
• No software other than the packages bundled with Core Linux have been installed.
• As described in the installation guide, it is assumed that any downloaded application source code is stored in a directory called /apps on the CD-R.
• It is assumed that the Core Linux computer is attached to a network on which there is at least form of internet access.

Preparation

1. Download the NTP source code from www.ntp.org.
2. Burn the file ntp-4.1.1.tar.gz to a CD. This page assumes that the subdirectory /apps is used for the .tar.gz file. The CD-ROM can be a multi-session disk.

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Booting

1. Boot your Core Linux PC.
2. Login as root. You will need to enter the password at the prompt.

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Extract the source

1. Place the CD-R in the CD-ROM drive. Mount the CD-ROM drive under /mnt/cdrom.
2. Change to the /apps directory on the CD-R.
3. Copy the ntp-4.1.1.tar.gz file to the directory /usr/src.
4. Change to the /usr/src directory and extract the source from the .tar.gz file.

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Configure and compile

1. Change to the /usr/src/ntp-4.1.1 directory.
2. Run the ./configure script.
3. Run the make program.
4. Run the make program with the argument check.
5. Run the make program with the argument install.

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NTPdate Initial Testing

1. Edit the file /etc/services and add the line ntp       123/udp. You should keep your services file in numerical order as "good housekeeping".
2. Set the system time using the ntpdate program.

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Automating NTPdate

1. Append the following line to the /etc/rc.d/rc.mu script:
   /usr/local/bin/ntpdate -su time.foobar.com
   You can also add comments and echoes for your own information.
2. Adjust the /etc/localtime link to point to the correct timezone in /usr/share/zoneinfo.
3. Reboot the system and check that the system time is updated.

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NTP Server Setup

1. Edit the file /etc/ntp.conf and add the following lines:
   server time1.foobar.com prefer
server time2.foobar.com
driftfile /etc/ntp.drift
authenticate no
2. Start the NTP daemon with the command /usr/local/bin/ntpd.
3. The daemon will take up to an hour to calculate the "drift" between your system clock and the remote NTP server.

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Automating NTP Server

1. Append the following line to the /etc/rc.d/rc.mu script:
   /usr/local/bin/ntpd
   You can also add comments and echoes for your own information.
2. Reboot the system and check that the system time is updated.

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