NTP 설정방법(vim /etc/chrony.conf)

# Use public servers from the pool.ntp.org project.

# 주석으로, pool.ntp.org 프로젝트의 공개 서버를 사용할 것임을 나타냅니다.

# Please consider joining the pool (https://www.pool.ntp.org/join.html).
#pool 2.rhel.pool.ntp.org iburst

# 주석으로, pool.ntp.org에 가입할 것을 권장하는 링크를 제공합니다.

# NTP
# 주석으로, 다음에 나오는 NTP 서버 설정을 나타냅니다.
server 172.172.0.1 iburst

# Use NTP servers from DHCP.
sourcedir /run/chrony-dhcp

# Record the rate at which the system clock gains/losses time.
driftfile /var/lib/chrony/drift

# Allow the system clock to be stepped in the first three updates
# if its offset is larger than 1 second.
makestep 1.0 3

# Enable kernel synchronization of the real-time clock (RTC).
rtcsync

# Enable hardware timestamping on all interfaces that support it.
#hwtimestamp *

# Increase the minimum number of selectable sources required to adjust
# the system clock.
#minsources 2

# Allow NTP client access from local network.
주석 처리된 라인으로, 로컬 네트워크에서 NTP 클라이언트 액세스를 허용할 것임을 나타냅니다.
#allow 192.168.0.0/16

# Serve time even if not synchronized to a time source.
#local stratum 10

# Require authentication (nts or key option) for all NTP sources.
#authselectmode require
          
# Specify file containing keys for NTP authentication.
keyfile /etc/chrony.keys
         
# Save NTS keys and cookies.
ntsdumpdir /var/lib/chrony
             
# Insert/delete leap seconds by slewing instead of stepping.
#leapsecmode slew
    
# Get TAI-UTC offset and leap seconds from the system tz database.
leapsectz right/UTC 
    
# Specify directory for log files.
logdir /var/log/chrony

NTP 서버를 정해주고(시간 기준)

클라이언트들이 접속할 수 있게

chronyc -n sources -v

systemctl enable --now chronyd