Windows ntp 서버, Linux ntp 클라이언트(ntpd) 시간 동기화 이슈
추가 확인내용.
원인은 client(linux) 에서 ntp server(windows) 로 지정된 윈도우 서버(내부 ntp)의 상위 ntp 서버 간 동기화 불가로 인해 발생 한 듯 하다..
windows 서버의 ntp 설정 후, 아래 옵션 없이도 정상적으로 동기화가 되었다.
-----------------------------------
[root@aaa ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
1.1.1.1 2.2.2.2 4 u 31 64 377 0.813 17953.7 6.886
[root@aaa ~]# ntpq
ntpq> assoc
ind assID status conf reach auth condition last_event cnt
===========================================================
1 5047 9014 yes yes none reject reachable 1
- 클라이언트 서버에 ntp 설정 추가
# vi /etc/ntp.conf
tos maxdist 20
# /etc/init.d/ntpd restart
[root@aaa ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
*aaa 1.1.1.1 4 u 7 64 377 0.325 -6.526 6.769 # * 표시가 생김
ntpq> assoc
ind assID status conf reach auth condition last_event cnt
===========================================================
1 50333 9614 yes yes none sys.peer reachable 1
| tos [ beacon beacon | ceiling ceiling | cohort {0 | 1} | floor floor | maxclock maxclock | maxdist maxdist | minclock minclock | mindist mindist | minsane minsane | orphan stratum ]This command alters certain system variables used by the the clock selection and clustering algorithms. The default values of these variables have been carefully optimized for a wide range of network speeds and reliability expectations. Very rarely is it necessary to change the default values; but, some folks can't resist twisting the knobs. It can be used to select the quality and quantity of peers used to synchronize the system clock and is most useful in dynamic server discovery schemes. The options are as follows: maxdist maxdistance Specify the synchronization distance threshold used by the clock selection algorithm. The default is 1.5 s. This determines both the minimum number of packets to set the system clock and the maximum roundtrip delay. It can be decreased to improve reliability or increased to synchronize clocks on the Moon or planets. |
참고사이트
https://blog.zwindler.fr/2015/09/05/debug-client-ntp-linux-vers-ntp-windows-server/
support.ntp.org/bin/view/Support/NTPRelatedDefinitionssupport.ntp.org/bin/view/Support/NTPRelatedDefinitionssupport.ntp.org/bin/view/Support/NTPRelatedDefinitions
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