{"id":12733,"date":"2022-05-14T08:12:02","date_gmt":"2022-05-14T05:12:02","guid":{"rendered":"https:\/\/kifarunix.com\/?p=12733"},"modified":"2024-03-09T13:40:00","modified_gmt":"2024-03-09T10:40:00","slug":"install-and-setup-ntp-server-on-ubuntu-22-04-debian-11","status":"publish","type":"post","link":"https:\/\/kifarunix.com\/install-and-setup-ntp-server-on-ubuntu-22-04-debian-11\/","title":{"rendered":"Install and Setup NTP Server on Ubuntu 22.04\/Debian 11"},"content":{"rendered":"\n

In this tutorial, you will learn how to install and setup NTP server on Ubuntu 22.04\/Debian 11. Network Time Protocol<\/a> is a networking protocol that is used to synchronize system clocks on a network. NTP client employs a server-client architecture where NTP clients synchronize time from NTP server(s). NTP daemon ( ntpd ) is an NTP client program.<\/p>\n\n\n\n

Install and Setup NTP Server on Ubuntu 22.04\/Debian 11<\/h2>\n\n\n\n

Install NTPd on Ubuntu 22.04\/Debian 11<\/h3>\n\n\n\n

Once the update is done, proceed to install NTP daemon on Ubuntu 22.04\/Debian 11. The ntpd daemon is provided by the ntp<\/em> package.<\/p>\n\n\n\n

To check if ntp<\/em> package is installed on Ubuntu 22.04\/Debian 11 run the command:<\/p>\n\n\n\n

sudo apt update -y<\/code><\/pre>\n\n\n\n
 dpkg -l ntp<\/code><\/pre>\n\n\n\n
If the package is not installed you will get output similar to:<\/p>\n\n\n\n
dpkg-query: no packages found matching ntp<\/code><\/pre>\n\n\n\n
The ntp<\/em> package is available on the default Ubuntu 22.04 and Debian 11 repositories.<\/p>\n\n\n\n
Install ntp<\/em> on Ubuntu 22.04\/Debian 11 by running the command:<\/p>\n\n\n\n
sudo apt install ntp ntpdate ntpstat -y<\/code><\/pre>\n\n\n\n
Verify that that ntp<\/em> package has been installed successfully by checking the version number:<\/p>\n\n\n\n
sntp --version<\/code><\/pre>\n\n\n\n
Output:<\/p>\n\n\n\n
sntp 4.2.8p15@1.3728-o Wed Feb 16 17:13:02 UTC 2022 (1)<\/code><\/pre>\n\n\n\n
Running NTPd on Ubuntu 22.04\/Debian 11<\/h3>\n\n\n\n
After installation NTP is started and enabled to start at boot time:<\/p>\n\n\n\n
systemctl status ntp<\/code><\/pre>\n\n\n\n
\n\u25cf ntp.service - Network Time Service\n     Loaded: loaded (\/lib\/systemd\/system\/ntp.service; enabled; vendor preset: enabled)\n     Active: active (running) since Sat 2022-05-14 09:01:38 UTC; 4min 51s ago\n       Docs: man:ntpd(8)\n    Process: 109951 ExecStart=\/usr\/lib\/ntp\/ntp-systemd-wrapper (code=exited, status=0\/SUCCESS)\n   Main PID: 109957 (ntpd)\n      Tasks: 2 (limit: 2241)\n     Memory: 1.4M\n        CPU: 138ms\n     CGroup: \/system.slice\/ntp.service\n             \u2514\u2500109957 \/usr\/sbin\/ntpd -p \/var\/run\/ntpd.pid -g -u 114:120\n\nMay 14 09:01:40 jellyfish ntpd[109957]: Soliciting pool server 160.119.216.206\nMay 14 09:01:40 jellyfish ntpd[109957]: Soliciting pool server 160.119.216.197\nMay 14 09:01:41 jellyfish ntpd[109957]: Soliciting pool server 2001:19f0:5401:16b:5400:3ff:fef6:2691\nMay 14 09:01:41 jellyfish ntpd[109957]: Soliciting pool server 64:ff9b::a077:d8ca\nMay 14 09:01:42 jellyfish ntpd[109957]: Soliciting pool server 64:ff9b::a077:d8ca\nMay 14 09:01:42 jellyfish ntpd[109957]: Soliciting pool server 91.189.94.4\nMay 14 09:01:43 jellyfish ntpd[109957]: Soliciting pool server 91.189.89.199\nMay 14 09:01:44 jellyfish ntpd[109957]: Soliciting pool server 91.189.91.157\n...\n<\/code><\/pre>\n\n\n\n
Setup NTP Server on Ubuntu 22.04\/Debian 11<\/h3>\n\n\n\n
NTP daemon (ntpd)<\/em> main configuration file is \/etc\/ntp.conf<\/code>. The file is configured to enable NTP server to fetch the correct time from NTP servers of higher stratum such as pool.ntp.org<\/em><\/strong>.<\/p>\n\n\n\n
The pool<\/em><\/strong> directive in the file enables setting of NTP time servers (pool) to use.<\/p>\n\n\n\n
sudo vim \/etc\/ntp.conf<\/code><\/pre>\n\n\n\n
By default NTP on Ubuntu 22.04\/Debian 11 uses ubuntu<\/em> pool time servers from the NTP servers pool.ntp.org<\/em><\/strong>;<\/p>\n\n\n\n
\n# Specify one or more NTP servers.\n\n# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board\n# on 2011-02-08 (LP: #104525). See http:\/\/www.pool.ntp.org\/join.html for\n# more information.\npool 0.ubuntu.pool.ntp.org iburst\npool 1.ubuntu.pool.ntp.org iburst\npool 2.ubuntu.pool.ntp.org iburst\npool 3.ubuntu.pool.ntp.org iburst<\/strong>\n\n# Use Ubuntu's ntp server as a fallback.\npool ntp.ubuntu.com<\/strong>\n<\/code><\/pre>\n\n\n\n
A list of time servers can be found at NTP Public Pool Time Servers<\/a> where one can choose which timeserver to use according to their timezone.<\/p>\n\n\n\n
First comment out the default ubuntu pool timeservers:<\/p>\n\n\n\n
...\n# more information.\n#pool 0.ubuntu.pool.ntp.org iburst\n#pool 1.ubuntu.pool.ntp.org iburst\n#pool 2.ubuntu.pool.ntp.org iburst\n#pool 3.ubuntu.pool.ntp.org iburst\n\n# Use Ubuntu's ntp server as a fallback.\n#pool ntp.ubuntu.com\n...<\/code><\/pre>\n\n\n\n
To add up servers from the ke.pool.ntp.org<\/em> pool add the following entry on the configuration file:<\/p>\n\n\n\n
...\n#US\nserver 0.us.pool.ntp.org iburst\nserver 1.us.pool.ntp.org iburst\nserver 2.us.pool.ntp.org iburst\nserver 3.us.pool.ntp.org iburst\n...<\/code><\/pre>\n\n\n\n
TIP:<\/em><\/strong> Setting the pool as pool.ntp.org allows the system to determine the nearest time servers to use.<\/em><\/p>\n\n\n\n
iburst<\/em><\/strong> option in the configuration file changes the initial interval of polls to a NTP server in order to speed up the initial synchronization.<\/p>\n\n\n\n
Configure Access Control for NTP Server (Optional)<\/h4>\n\n\n\n
NTP server can optionally be configured to only allow specific NTP client connections to query them using the restrict<\/em><\/strong> directive in the \/etc\/ntp.conf<\/code> configuration file which uses the syntax:<\/p>\n\n\n\n
restrict address [mask mask] [other options]<\/code><\/pre>\n\n\n\n
This access control can be used to limit access to NTP service to particular LAN. For instance to only allow connections from the network 192.168.56.0\/24, define the network address by appending the line:<\/p>\n\n\n\n
restrict 192.168.56.0 mask 255.255.255.0 nomodify notrap<\/code><\/pre>\n\n\n\n
Where:<\/p>\n\n\n\n