Difference between revisions of "Network Time Protocol"
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== Syncing your clock to Virginia Tech's time servers == | == Syncing your clock to Virginia Tech's time servers == | ||
| − | Virginia Tech hosts four [ | + | Virginia Tech hosts four [[w:Network Time Protocol|Network Time Protocol]] (NTP) servers: |
| + | |||
| + | * '''ntp-1.vt.edu''' (198.82.247.51) (2001:468:c80:2101:0:14b:a768:154f) | ||
| + | * '''ntp-2.vt.edu''' (198.82.247.71) (2001:468:c80:4101:0:1b6:a45f:ab40) | ||
| + | * '''ntp-3.vt.edu''' (198.82.247.108) (2001:468:c80:6101:0:111:7c3a:677) | ||
| + | * '''ntp-4.vt.edu''' (198.82.247.131) (2001:468:c80:8101:0:178:d2dd:db75) | ||
| + | |||
| + | The current status of the NTP servers can be found at [https://ntpstats.cns.vt.edu/ cns.vt.edu]. | ||
| + | |||
| + | === Using Gnome === | ||
| + | # Right click on the clock in the top right hand corner of your desktop and select '''Adjust Date & Time'''. | ||
| + | # You may have to enter your password to continue. | ||
| + | # From the '''Configuration''' drop-down list, select '''Keep synchronized with Internet servers'''. | ||
| + | # You may need to click '''Install NTP support'''. | ||
| + | # Click '''Select Servers'''. | ||
| + | # Type <code>ntp-1.vt.edu</code> | ||
| + | # Click the '''Add''' button. | ||
| + | # Type <code>ntp-2.vt.edu</code> | ||
| + | # Click the '''Add''' button. | ||
| + | # Type <code>ntp-3.vt.edu</code> | ||
| + | # Click the '''Add''' button. | ||
| + | # Type <code>ntp-4.vt.edu</code> | ||
| + | # Click the '''Add''' button. | ||
| + | # Click the '''Close''' button. | ||
| + | # Click the '''Close''' button again. | ||
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=== Using ntpd === | === Using ntpd === | ||
| − | < | + | Backup your <code>/etc/ntp.conf</code>: |
| − | + | <pre> | |
| − | < | + | # cp /etc/ntp.conf /etc/ntp.conf.bak |
| − | + | </pre> | |
| + | |||
| + | Add the following lines to <code>/etc/ntp.conf</code>: | ||
| + | <pre> | ||
| + | server ntp-1.vt.edu | ||
server ntp-2.vt.edu | server ntp-2.vt.edu | ||
server ntp-3.vt.edu | server ntp-3.vt.edu | ||
| − | server ntp-4.vt.edu</pre> | + | server ntp-4.vt.edu |
| + | </pre> | ||
| + | |||
=== Using ntpdate === | === Using ntpdate === | ||
| − | + | Change the contents of <code>/etc/cron.daily/ntpdate</code> to: | |
| − | </ | + | <pre> |
| + | ntpdate ntp-1.vt.edu ntp-2.vt.edu ntp-3.vt.edu ntp-4.vt.edu | ||
| + | </pre> | ||
| + | |||
| + | === Using chrony === | ||
| + | Backup your <code>/etc/chrony/chrony.conf</code>: | ||
| + | <pre> | ||
| + | # cp /etc/chrony/chrony.conf /etc/chrony/chrony.conf.bak | ||
| + | </pre> | ||
| + | |||
| + | Add the following lines to <code>/etc/chrony/chrony.conf</code>: | ||
| + | <pre> | ||
| + | server ntp-1.vt.edu | ||
| + | server ntp-2.vt.edu | ||
| + | server ntp-3.vt.edu | ||
| + | server ntp-4.vt.edu | ||
| + | </pre> | ||
| + | |||
| + | === Using dnsmasq === | ||
| + | This is will send the ntp addresses over dhcp. | ||
| + | Add the following line to <code>/etc/dnsmasq.conf</code>: | ||
| + | <pre> | ||
| + | dhcp-option=option:ntp-server,198.82.247.51,198.82.247.71,198.82.247.108,198.82.247.131 | ||
| + | </pre> | ||
| + | [[Category:Howtos]] | ||
| + | [[Category:Campus computing resources]] | ||
Latest revision as of 14:49, 25 September 2026
Contents
Syncing your clock to Virginia Tech's time servers
Virginia Tech hosts four Network Time Protocol (NTP) servers:
- ntp-1.vt.edu (198.82.247.51) (2001:468:c80:2101:0:14b:a768:154f)
- ntp-2.vt.edu (198.82.247.71) (2001:468:c80:4101:0:1b6:a45f:ab40)
- ntp-3.vt.edu (198.82.247.108) (2001:468:c80:6101:0:111:7c3a:677)
- ntp-4.vt.edu (198.82.247.131) (2001:468:c80:8101:0:178:d2dd:db75)
The current status of the NTP servers can be found at cns.vt.edu.
Using Gnome
- Right click on the clock in the top right hand corner of your desktop and select Adjust Date & Time.
- You may have to enter your password to continue.
- From the Configuration drop-down list, select Keep synchronized with Internet servers.
- You may need to click Install NTP support.
- Click Select Servers.
- Type
ntp-1.vt.edu - Click the Add button.
- Type
ntp-2.vt.edu - Click the Add button.
- Type
ntp-3.vt.edu - Click the Add button.
- Type
ntp-4.vt.edu - Click the Add button.
- Click the Close button.
- Click the Close button again.
Using ntpd
Backup your /etc/ntp.conf:
# cp /etc/ntp.conf /etc/ntp.conf.bak
Add the following lines to /etc/ntp.conf:
server ntp-1.vt.edu server ntp-2.vt.edu server ntp-3.vt.edu server ntp-4.vt.edu
Using ntpdate
Change the contents of /etc/cron.daily/ntpdate to:
ntpdate ntp-1.vt.edu ntp-2.vt.edu ntp-3.vt.edu ntp-4.vt.edu
Using chrony
Backup your /etc/chrony/chrony.conf:
# cp /etc/chrony/chrony.conf /etc/chrony/chrony.conf.bak
Add the following lines to /etc/chrony/chrony.conf:
server ntp-1.vt.edu server ntp-2.vt.edu server ntp-3.vt.edu server ntp-4.vt.edu
Using dnsmasq
This is will send the ntp addresses over dhcp.
Add the following line to /etc/dnsmasq.conf:
dhcp-option=option:ntp-server,198.82.247.51,198.82.247.71,198.82.247.108,198.82.247.131
