NTP Server : Configure NTP Server (NTPsec)2026/04/24 |
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Install NTPsec and Configure NTP server for time adjustment. NTP uses 123/UDP. |
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| [1] | Install and Configure NTPsec. |
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root@dlp:~#
apt -y install ntpsec
root@dlp:~#
vi /etc/ntpsec/ntp.conf # line 25 : if you use your own NTP servers only and also # pool entries are a few, change number of value below or comment out the line #tos minclock 4 minsane 3 # line 35 : comment out default settings and add NTP server pool you like to use # * OK to keep default if you do not have specific requirements #pool 0.ubuntu.pool.ntp.org iburst #pool 1.ubuntu.pool.ntp.org iburst #pool 2.ubuntu.pool.ntp.org iburst #pool 3.ubuntu.pool.ntp.org iburst # Use Ubuntu's ntp server as a fallback. #server ntp.ubuntu.com pool ntp.nict.jp iburstroot@dlp:~# systemctl restart ntpsec
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| [2] | If UFW is enabled, allow NTP service. NTP uses [123/UDP]. |
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root@dlp:~# ufw allow ntp Rule added Rule added (v6) |
| [3] | Verify it works normally. |
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root@dlp:~# ntpq -p
remote refid st t when poll reach delay offset jitter
=======================================================================================================
ntp.nict.jp .POOL. 16 p - 256 0 0.0000 0.0000 0.0001
-ntp-b2.nict.go.jp .NICT. 1 u 46 64 1 18.8696 0.0448 1.3737
-ntp-a3.nict.go.jp .NICT. 1 u 46 64 1 17.0480 -1.8326 1.4077
*ntp-k1.nict.jp .NICT. 1 u 46 64 1 13.3218 -0.2959 1.4842
+ntp-a2.nict.go.jp .NICT. 1 u 47 64 1 16.5628 -1.3190 1.3675
+ntp-b3.nict.go.jp .NICT. 1 u 47 64 1 20.2384 -0.5751 1.3671
ntp-a2.nict.go.jp .INIT. 16 u - 64 0 0.0000 0.0000 0.0001
ntp-a3.nict.go.jp .INIT. 16 u - 64 0 0.0000 0.0000 0.0001
2001:ce8:78::2 .INIT. 16 u - 64 0 0.0000 0.0000 0.0001
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