A) 시간 정보를 참조할 서버 정보 등록
root 계정으로 vi /etc/chrony.conf 하여 설정 수정
server [동기화 서버의 IP] iburst
server time.bora.net iburst server ntp2.kornet.net iburst server 1.kr.pool.ntp.org iburst
B) 시간 정보를 제공할 IP 대역 등록
root 계정으로 vi /etc/chrony.conf 하여 설정 수정
allow 192.168.0.0/24
[root@ol8 ~]# cat /etc/chrony.conf # Use public servers from the pool.ntp.org project. # Please consider joining the pool (http://www.pool.ntp.org/join.html). #pool 2.rhel.pool.ntp.org iburst server time.bora.net iburst server ntp2.kornet.net iburst server 1.kr.pool.ntp.org iburst # 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. #allow 192.168.0.0/16 allow 192.168.12.0/24 # Serve time even if not synchronized to a time source. #local stratum 10 # Specify file containing keys for NTP authentication. keyfile /etc/chrony.keys # Get TAI-UTC offset and leap seconds from the system tz database. leapsectz right/UTC # Specify directory for log files. logdir /var/log/chrony # Select which information is logged. #log measurements statistics tracking
{}
C) 시간 동기화 서비스 기동 및 활성화
시간 동기화 서비스 기동 및 활성화
systemctl start chronyd systemctl enable chronyd
[root@ol8 ~]# systemctl start chronyd [root@ol8 ~]# systemctl enable chronyd Created symlink /etc/systemd/system/multi-user.target.wants/chronyd.service → /usr/lib/systemd/system/chronyd.service.
D) 서비스 기동 결과 확인
시간동기화 서비스 확인
timedatectl chronyc sources chronyc sourcestats chronyc sources -v chronyc tracking
[root@ol8 ~]# timedatectl
Local time: Tue 2024-04-02 09:43:08 KST
Universal time: Tue 2024-04-02 00:43:08 UTC
RTC time: Tue 2024-04-02 00:43:08
Time zone: Asia/Seoul (KST, +0900)
System clock synchronized: yes
NTP service: active
RTC in local TZ: no
[root@ol8 ~]# chronyc sources
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^? time.bora.net 2 6 40 22 -395ms[ -395ms] +/- 1563ms
^? 169.254.169.123 0 7 0 - +0ns[ +0ns] +/- 0ns
^? 169.254.169.124 0 7 0 - +0ns[ +0ns] +/- 0ns
[root@ol8 ~]# chronyc sourcestats
Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
==============================================================================
time.bora.net 1 0 0 +0.000 2000.000 -395ms 4000ms
169.254.169.123 0 0 0 +0.000 2000.000 +0ns 4000ms
169.254.169.124 0 0 0 +0.000 2000.000 +0ns 4000ms
[root@ol8 ~]# chronyc sources -v
.-- Source mode '^' = server, '=' = peer, '#' = local clock.
/ .- Source state '*' = current best, '+' = combined, '-' = not combined,
| / 'x' = may be in error, '~' = too variable, '?' = unusable.
|| .- xxxx [ yyyy ] +/- zzzz
|| Reachability register (octal) -. | xxxx = adjusted offset,
|| Log2(Polling interval) --. | | yyyy = measured offset,
|| \ | | zzzz = estimated error.
|| | | \
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^? time.bora.net 2 6 40 26 -395ms[ -395ms] +/- 1563ms
^? 169.254.169.123 0 7 0 - +0ns[ +0ns] +/- 0ns
^? 169.254.169.124 0 7 0 - +0ns[ +0ns] +/- 0ns
[root@ol8 ~]# chronyc tracking
Reference ID : 00000000 ()
Stratum : 0
Ref time (UTC) : Thu Jan 01 00:00:00 1970
System time : 0.000000000 seconds slow of NTP time
Last offset : +0.000000000 seconds
RMS offset : 0.000000000 seconds
Frequency : 22.488 ppm slow
Residual freq : +0.000 ppm
Skew : 0.000 ppm
Root delay : 1.000000000 seconds
Root dispersion : 1.000000000 seconds
Update interval : 0.0 seconds
Leap status : Not synchronised
