The NTP package contains a client and server to keep the time synchronized between various computers over a network. This package is the official reference implementation of the NTP protocol.
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Download size: 2.3 MB
Estimated disk space required: 22.1 MB
Estimated build time: 0.4 SBU
User Notes: http://wiki.linuxfromscratch.org/blfs/wiki/ntp
Install NTP by running the following commands:
./configure --prefix=/usr --bindir=/usr/sbin \ --sysconfdir=/etc && make
To test the results, issue: make check.
Now, as the root user:
make install && install -v -m755 -d /usr/share/doc/ntp-4.2.0a && cp -v -R html /usr/share/doc/ntp-4.2.0a/
The following configuration file defines various NTP servers with open access from different continents. It also creates a drift file where ntpd stores the frequency offset. Since the documentation included with the package is sparse, visit the NTP website at http://www.ntp.org/ and http://www.pool.ntp.org/ for more information.
cat > /etc/ntp.conf << "EOF" # Africa server tock.nml.csir.co.za # Asia server 0.asia.pool.ntp.org # Australia server 0.oceania.pool.ntp.org # Europe server 0.europe.pool.ntp.org # North America server 0.north-america.pool.ntp.org # South America server 2.south-america.pool.ntp.org driftfile /var/cache/ntp.drift EOF
There are two options. Option one is to run ntpd continuously and allow it to synchronize the time in a gradual manner. The other option is to run ntpd periodically (using cron) and update the time each time ntpd is scheduled.
If you choose Option one, then install the /etc/rc.d/init.d/ntp init script included in the blfs-bootscripts-20060910 package.
If you prefer to run ntpd periodically, add the following command to root's crontab:
Execute the following command if you would like to set the hardware clock to the current system time at shutdown and reboot:
ln -v -sf ../init.d/setclock /etc/rc.d/rc0.d/K46setclock && ln -v -sf ../init.d/setclock /etc/rc.d/rc6.d/K46setclock
The other way around is already set up by LFS.
generates cryptographic data files used by the NTPv4 authentication and identification schemes.
is useful at boot time, to delay the boot sequence until ntpd has set the time.
is a NTP daemon that runs in the background and keeps the date and time synchronized based on response from configured NTP servers. It also functions as a NTP server.
is a client program that sets the date and time based on the response from an NTP server. This command is deprecated.
is used to query the NTP daemon about its current state and to request changes in that state.
is an utility program used to monitor ntpd operations and determine performance.
reads and displays time-related kernel variables.
traces a chain of NTP servers back to the primary source.
reads, and optionally modifies, several timekeeping-related variables in older kernels that do not have support for precision timekeeping.
Last updated on 2007-01-30 12:28:32 -0600