The Network Time Protocol (NTP) is used to synchronize the time of a computer client or server to another server. To install ntp on centos 7 using commands below:
[root@tekbloq ~]# yum -y install ntp
To configure ntp server you needs to open configuration file /etc/ntp.conf.
# Hosts on local network are less restricted.
restrict 172.16.171.0 mask 255.255.255.0 nomodify notrap
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
# add your ntp server here
server 0.az.pool.ntp.org
#broadcast 192.168.1.255 autokey # broadcast server
#broadcastclient # broadcast client
#broadcast 224.0.1.1 autokey # multicast server
#multicastclient 224.0.1.1 # multicast client
#manycastserver 239.255.254.254 # manycast server
#manycastclient 239.255.254.254 autokey # manycast client
If you have firewall enabled You may add ntp to firewall allow list and restart the firewall service.
[root@tekbloq ~]# firewall-cmd –add-service=ntp –permanent
[root@tekbloq ~]# firewall-cmd –reload
You can test ntp service ntpq -p commands.
To start, stop, restart and to look at ntp service status You can run commands as follow:
ntpd.service – Network Time Service
Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled)
Active: active (running) since Mon 2019-10-21 07:01:13 EDT; 1 day 1h ago
Process: 592 ExecStart=/usr/sbin/ntpd -u ntp:ntp $OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 603 (ntpd)
CGroup: /system.slice/ntpd.service
ââ603 /usr/sbin/ntpd -u ntp:ntp -g
ââ604 /usr/sbin/ntpd -u ntp:ntp -g
[root@tekbloq ~]# systemctl stop ntpd
[root@tekbloq ~]# systemctl start ntpd
[root@tekbloq ~]# systemctl restart ntpd
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GOOD LUCK!!!
