Windows-Server-2008
帶有 Linux 客戶端的 Windows NTP 伺服器
有沒有人有過將 Linux(特別是 Red Hat)同步到 Windows NTP 伺服器的經驗?目前,我們的 Windows 伺服器正在與 Internet 上的第 1 層伺服器同步,但 Linux 機器拒絕承認它是一個好的時間源。
經過一些研究,我們的問題似乎是 Root Dispersion 值可能太高了。這是 ntpq 的輸出 -
ntpq> peers remote refid st t when poll reach delay offset jitter ============================================================================== ntp1.ourdomain 10.10.10.1 4 u 20 128 377 0.376 1397.10 22.800 ntpq> ass ind assID status conf reach auth condition last_event cnt =========================================================== 1 30939 90b4 yes yes none reject reachable 11 ntpq> rv 30939 assID=30939 status=90b4 reach, conf, 11 events, event_reach, srcadr=ntp1.ourdomain.com, srcport=123, dstadr=10.10.10.2, dstport=123, leap=00, stratum=4, precision=-6, rootdelay=93.750, rootdispersion=2333.466, refid=10.10.10.1, reach=377, unreach=0, hmode=3, pmode=4, hpoll=7, ppoll=7, flash=400 peer_dist, keyid=0, ttl=0, offset=1369.793, delay=0.000, dispersion=21.915, jitter=15.387, reftime=d7493cd7.fd3528d6 Mon, Jun 16 2014 10:52:23.989, org=d74944eb.b857f9bc Mon, Jun 16 2014 11:26:51.720, rec=d74944ea.5709a581 Mon, Jun 16 2014 11:26:50.339, xmt=d74944ea.56ea01a7 Mon, Jun 16 2014 11:26:50.339, filtdelay= 0.48 0.51 0.00 0.43 0.50 0.44 0.40 0.55, filtoffset= 1380.34 1376.38 1369.79 1362.68 1360.75 1353.16 1349.80 1343.46, filtdisp= 15.63 17.58 19.48 21.42 23.37 25.30 27.25 29.20
我想了解的是為什麼這個值如此之高,我們可以在 Windows 伺服器上配置什麼來改變它。
更新
這是來自我們的 Windows NTP 伺服器的一些資訊 -
c:\Windows\System32>w32tm /query /status Leap Indicator: 0(no warning) Stratum: 2 (secondary reference - syncd by (S)NTP) Precision: -6 (15.625ms per tick) Root Delay: 0.0312500s Root Dispersion: 1.2097655s ReferenceId: 0x9E2BC042 (source IP: 158.43.192.66) Last Successful Sync Time: 18/06/2014 04:41:16 Source: ntp2.pipex.net Poll Interval: 15 (32768s) c:\Windows\System32>w32tm /query /peers #Peers: 2 Peer: ntp1.pipex.net State: Active Time Remaining: 6264.1144284s Mode: 1 (Symmetric Active) Stratum: 2 (secondary reference - syncd by (S)NTP) PeerPoll Interval: 15 (32768s) HostPoll Interval: 15 (32768s) Peer: ntp2.pipex.net State: Active Time Remaining: 6264.1144284s Mode: 1 (Symmetric Active) Stratum: 1 (primary reference - syncd by radio clock) PeerPoll Interval: 15 (32768s) HostPoll Interval: 15 (32768s)
如果 ntpd 由於偏移量大而斷定遠端時鐘出現問題,它將拒絕時鐘。您的 linux 機器很可能拒絕 Windows TS,因為偏移量高於恐慌門檻值。假設 Windows 時間伺服器正常工作,您應該考慮將
-g
標誌添加到 ntpd 呼叫:-g Normally, ntpd exits with a message to the system log if the offset exceeds the panic threshold, which is 1000 s by default. This option allows the time to be set to any value without restriction; however, this can happen only once. If the threshold is exceeded after that, ntpd will exit with a message to the system log. This option can be used with the -q and -x options.
或將
panic
值設置為更高或為零:panic panic Specifies the panic threshold in seconds with default 1000 s. If set to zero, the panic sanity check is disabled and a clock offset of any value will be accepted.
僅供參考:尚不清楚您的 Windows 時間安裝是否正常工作和/或按照您描述的方式進行配置。您提到 Windows 伺服器正在與 Internet 上的第 1 層機器同步。但是,您的同行廣告牌顯示 ntp1.ourdomain 位於第四層:
Stratum Machine description 1 ntp ref clock on internet 2 ????????? 3 ????????? 4 ntp1.ourdomain 5 linux boxes
對於具有如此低延遲的機器來說,抖動值也非常高,我假設這表示同一本地網路上的機器。