[CentOS7] NTP 서버 설정

* NTP : Network Time Protocol

1. Install NTP package

#> yum -y install ntp

2. Configure NTP environment

#> vi /etc/ntp.conf

3. Startup NTP daemon and register system start process daemon

# below CentOS 7
#> service ntpd start
#> chkconfig ntpd on

# in CentOS 7
#> systemctl start ntpd
#> systemctl enable ntpd

4. Check process

#> ntpq -p