Setting up NTP in CentOS 7

Prerequisites Step 1: Endure you are in the correct time zone

# timedatectl
      Local time: Wed 2018-09-12 13:48:31 +08
  Universal time: Wed 2018-09-12 05:48:31 UTC
        RTC time: Wed 2018-09-12 05:48:31
       Time zone: Asia/Singapore (+08, +0800)
     NTP enabled: yes
NTP synchronized: yes
 RTC in local TZ: no
      DST active: n/a

Prerequisites Step 2: List Time Zone

# timedatectl list-timezones

Prerequisites Step 3: Set Time Zone

# timedatectl set-timezone Asia/Singapore


Step 1: Yum Install

NTP can be installed from the CentOS repositories with yum

# yum install ntp

Step 2: Edit the Public Time Servers

Once you have installed ntp package, go to official NTP Public Pool Time Servers . For Singapore, you can use this specific pool zone, add the following to your ntp.conf file:

server iburst
server iburst
server iburst
server iburst

Step 3: Allow the clients from the network to sync with this server

Restrict which clients from which network is allowed to query and sync time

restrict netmask nomodify notrap

Step 4: Record all NTP server issues into one dedicated log file. Edit /etc/ntp.conf

logfile /var/log/ntp.log

Step 5: Add Firewall Rule and Start Services

# firewall-cmd --add-service=ntp --permanent
# firewall-cmd --reload
# systemctl start ntpd
# systemctl enable ntpd
# systemctl status ntpd

Step 6: Verify Time Sync

# ntpq -p
# date -R

Or query or synchronize against a selected pool of time servers

# ntpdate -q


  1. Setting Up “NTP (Network Time Protocol) Server” in RHEL/CentOS 7 (by

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