ntpdate
Ubuntu comes with ntpdate as standard and will run it once at boot time to set up your time according to Ubuntu’s NTP server.
ntpdate -s ntp.ubuntu.com
ntpd
The ntp daemon ntpd calculates the drift of your system clock and continuously adjusts it, so there are no large corrections that could lead to inconsistent logs for instance. The cost is a little processing power and memory, but for a modern server, this is negligible.
Installation
To install ntpd, from a terminal prompt enter:
sudo apt-get install ntp
Configuration
Sudo nano /etc/ntp.conf
# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
# more information.
server bd.pool.ntp.org
server 0.asia.pool.ntp.org
server 1.asia.pool.ntp.org
server 2.asia.pool.ntp.org
server 3.asia.pool.ntp.org
server 0.ubuntu.pool.ntp.org
server 1.ubuntu.pool.ntp.org
server 2.ubuntu.pool.ntp.org
server 3.ubuntu.pool.ntp.org
After changing the config file you have to reload the ntpd:
sudo service ntp reload
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