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chrony 설치 및 설정
chrony 설치
yum install -y chrony
chrony 서비스 활성화(enable) 및 서비스 시작(start)
systemctl --now enable chronyd
(또는)
systemctl enable chronyd
systemctl start chronyd
chrony.conf 편집
- time.bora.net 추가
- times.postech.ac.kr 추가
vim /etc/chrony.conf
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
#server 3.centos.pool.ntp.org iburst
server time.bora.net iburst
server times.postech.ac.kr 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
# Serve time even if not synchronized to a time source.
#local stratum 10
# Specify file containing keys for NTP authentication.
#keyfile /etc/chrony.keys
# Specify directory for log files.
logdir /var/log/chrony
# Select which information is logged.
#log measurements statistics tracking
서비스 재기동
systemctl restart chronyd
$ systemctl restart chronyd
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서비스 확인
ntp 소스 서버 상태 확인
chronyc sourcestats -v
$ chronyc sourcestats -v
210 Number of sources = 2
.- Number of sample points in measurement set.
/ .- Number of residual runs with same sign.
| / .- Length of measurement set (time).
| | / .- Est. clock freq error (ppm).
| | | / .- Est. error in freq.
| | | | / .- Est. offset.
| | | | | | On the -.
| | | | | | samples. \
| | | | | | |
Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
==============================================================================
time.bora.net 9 5 327 -0.836 7.884 -47us 448us
121.125.77.167 0 0 0 +0.000 2000.000 +0ns 4000ms
시간 동기화 상태 확인
chronyc sources -v
$ chronyc sources -v
210 Number of sources = 2
.-- Source mode '^' = server, '=' = peer, '#' = local clock.
/ .- Source state '*' = current synced, '+' = combined , '-' = not combined,
| / '?' = unreachable, 'x' = time may be in error, '~' = time too variable.
|| .- 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 3 6 377 11 +99us[ +75us] +/- 33ms
^? 121.125.77.167 0 8 0 - +0ns[ +0ns] +/- 0ns
동기화 명령
chronyc -a makestep
$ chronyc -a makestep
200 OK
tracking
chronyc tracking
$ chronyc tracking
Reference ID : CBF8F08C (time.bora.net)
Stratum : 4
Ref time (UTC) : Mon Nov 16 12:45:16 2020
System time : 0.081910394 seconds slow of NTP time
Last offset : -0.000361153 seconds
RMS offset : 0.000361153 seconds
Frequency : 17.039 ppm slow
Residual freq : -102.455 ppm
Skew : 0.066 ppm
Root delay : 0.025002619 seconds
Root dispersion : 0.016522199 seconds
Update interval : 1.9 seconds
Leap status : Normal
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