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| '''ntpd (Network Time Protocol Daemon)'''<br>
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| The ntpd program is an operating system daemon which sets and maintains the system time of day in synchronism with Internet standard time servers. It is a complete implementation of the Network Time Protocol (NTP) version 4, but also retains compatibility with version 3, as defined by RFC-1305, and version 1 and 2, as defined by RFC-1059 and RFC-1119, respectively.
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| '''Automating the time synchronization'''<br>
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| You have two choices for automatic time updating, you can run ntpd all the time as a background process or you can have it run once in awhile (if you are tight on system resources).
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| Running ntpd all the time-<br>
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| ::Just enable rc.ntpd script:
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| ::::<code>chmod +x /etc/rc.d/rc.ntpd</code>
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| ::After the script is enabled you probably will want ntpd to start immediately so, can either restart the system or manually start ntpd with:
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| ::::<code>/etc/rc.d/rc.ntpd start</code>
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| Running ntpd once in awhile-<br>
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| ::You have many choices but the two best ones are:
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| :::1) Set up a cron job
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| :::2) Set up a /etc/rc.d/rc.local entry and update the time on start-up only.
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| ::Either way, you need to add the following commands into your cron job or rc.local script:
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| ::::<code>ntpdate -o 4 pool.ntp.org</code> <---(updates the time)
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| ::::<code>hwclock --systohc</code> <-----------------(saves the time to the hardware clock)
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| '''Manually updating the time'''<br>
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| Issue the following commands:
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| ::::<code>ntpdate -o 4 pool.ntp.org</code>
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| ::::<code>hwclock --systohc</code>
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| '''Choosing the right time server'''<br>
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| On ntp.org you will find a complete list with the right time server for you.
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| Let's say you live in germany, then you will choose <code>de.pool.ntp.org</code>. A complete List is available at http://support.ntp.org/bin/view/Servers/NTPPoolServers
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| '''DST changes'''<br>
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| If your time is off due to DST changes, you must update the <code>/etc/localtime</code> file. You should be able to find a correct file on the internet and just replace the old <code>/etc/localtime</code> file.
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| NOTE: Slackware 11 is immune to the 2007 DST changes.
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| '''Possible Errors & Fixes'''<br>
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| ERROR: "Unable to contact time server:" error with KDE time Control Module.<br>
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| FIX: Make sure ntpd is NOT running. If ntpd is running, manual ntp and KDE ntp updates will return errors due to ntpd having control of the ntp port.
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| [[Category:Tutorials]]
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