NTPD: Difference between revisions
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== Automating the time synchronization == | |||
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). | 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). | ||
Running ntpd all the time | '''Running ntpd all the time'''<br> | ||
::Just enable rc.ntpd script: | ::Just enable rc.ntpd script: | ||
::::<code>chmod +x /etc/rc.d/rc.ntpd</code> | ::::<code>chmod +x /etc/rc.d/rc.ntpd</code> | ||
| Line 12: | Line 9: | ||
::::<code>/etc/rc.d/rc.ntpd start</code> | ::::<code>/etc/rc.d/rc.ntpd start</code> | ||
Running ntpd once in awhile | '''Running ntpd once in awhile'''<br> | ||
::You have many choices but the two best ones are: | ::You have many choices but the two best ones are: | ||
:::1) Set up a cron job | :::1) Set up a cron job | ||
:::2) Set up a /etc/rc.d/rc.local entry and update the time on start-up only. | :::2) Set up a /etc/rc.d/rc.local entry and update the time on start-up only. | ||
::Either way, you need to add the following commands into your cron job or rc.local script: | ::Either way, you need to add the following commands into your cron job or rc.local script: | ||
::::<code>ntpdate | ::::<code>ntpdate pool.ntp.org</code> <---(updates the time) | ||
::::<code>hwclock --systohc</code> < | ::::<code>hwclock --systohc</code> <------(saves the time to the hardware clock) | ||
<br> | |||
<br> | |||
==Manually updating the time== | |||
Issue the following commands: | Issue the following commands: | ||
::::<code>ntpdate | ::::<code>ntpdate pool.ntp.org</code> | ||
::::<code>hwclock --systohc</code> | ::::<code>hwclock --systohc</code> | ||
<br> | |||
<br> | |||
==Choosing the right time server== | |||
On ntp.org you will find a complete list with the right time server for you. | On ntp.org you will find a complete list with the right time server for you. | ||
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 | 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 | ||
<br> | |||
<br> | |||
==DST changes== | |||
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. | 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. | ||
<br> | |||
<br> | |||
==PROBLEMS== | |||
'''PROBLEM:''' "Unable to contact time server:" error with KDE's Time Control Module.<br> | |||
'''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. | |||
''' | |||
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. | |||
[[Category:Tutorials]] | [[Category:Tutorials]] | ||
Latest revision as of 15:04, 30 August 2012
Automating the time synchronization
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).
Running ntpd all the time
- Just enable rc.ntpd script:
chmod +x /etc/rc.d/rc.ntpd
- After the script is enabled you probably will want ntpd to start immediately so, can either restart the system or manually start ntpd with:
/etc/rc.d/rc.ntpd start
- Just enable rc.ntpd script:
Running ntpd once in awhile
- You have many choices but the two best ones are:
- 1) Set up a cron job
- 2) Set up a /etc/rc.d/rc.local entry and update the time on start-up only.
- Either way, you need to add the following commands into your cron job or rc.local script:
ntpdate pool.ntp.org<---(updates the time)hwclock --systohc<------(saves the time to the hardware clock)
- You have many choices but the two best ones are:
Manually updating the time
Issue the following commands:
ntpdate pool.ntp.orghwclock --systohc
Choosing the right time server
On ntp.org you will find a complete list with the right time server for you.
Let's say you live in germany, then you will choose de.pool.ntp.org. A complete List is available at http://support.ntp.org/bin/view/Servers/NTPPoolServers
DST changes
If your time is off due to DST changes, you must update the /etc/localtime file. You should be able to find a correct file on the internet and just replace the old /etc/localtime file.
PROBLEMS
PROBLEM: "Unable to contact time server:" error with KDE's Time Control Module.
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.