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大家好!

我有这个问题:

我正在使用我工作的公司的旧 GPS-Sirf/NMEA 模块为 GPSD 服务 ntp(现在在我的笔记本电脑上)。

让我们忘记 Ntpd .. 一旦我启动 gpsd,虽然日期和时间在gpsmon中是正确的,但如果我运行ntpshmmon ,我在标记为“真实”的列中有一个负时间(大约 -69 年以秒计),我假设是我的 SHM 的时钟信息(而“时钟”列实际上是接收到的信息)

如果我更换模块并使用 U-blox 一切正常,SHM 时钟恢复为 +46 年。有没有办法管理 GPS 与 NTP 的信息交换?或者在不确切知道 GPS 模块是什么的情况下配置 GPS?

对不起,如果我的问题是某种空中仙女......我希望有人遇到我同样的问题并且可以发现线索......

谢谢!:)

佛罗里达州

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1 回答 1

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第一条规则是:不要惊慌

尝试插入tinker panic 0您的/etc/ntp.conf

ntpd 的反应取决于系统时钟和参考时间之间的差异。

对于微小的偏移量,ntpd 将照常调整本地时钟;对于较小和较大的偏移量,ntpd 会暂时拒绝参考时间。在后一种情况下,操作系统的时钟将继续使用最后一次有效的校正,同时拒绝新的参考时间。一段时间后,小偏移量(明显小于一秒)将被摆动(缓慢调整),而较大的偏移量将导致时钟步进(重新设置)。巨大的偏移量被拒绝,并且 ntpd 将自行终止,相信一定发生了一些非常奇怪的事情。(引文

将恐慌设置为零可以防止 ntpd 产生大偏移量带来的奇怪想法。

我们使用一个看起来像

# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help

driftfile /var/lib/ntp/ntp.drift

# Enable this if you want statistics to be logged.
#statsdir /var/log/ntpstats/

statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable

tinker panic 0

# Specify one or more NTP servers.
server 127.127.28.0 minpoll 4 maxpoll 4
fudge 127.127.28.0 time1 0.420 refid GPS
server 127.127.28.1 minpoll 4 maxpoll 4 prefer
fudge 127.127.28.1 refid GPS1

# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
# more information.
server 0.ubuntu.pool.ntp.org
server 1.ubuntu.pool.ntp.org
server 2.ubuntu.pool.ntp.org
server 3.ubuntu.pool.ntp.org

# Use Ubuntu's ntp server as a fallback.
server ntp.ubuntu.com

# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
# details.  The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions>
# might also be helpful.
#
# Note that "restrict" applies to both servers and clients, so a configuration
# that might be intended to block requests from certain clients could also end
# up blocking replies from your own upstream servers.

# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery
restrict -6 default kod notrap nomodify nopeer noquery

# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1

# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
#restrict 192.168.123.0 mask 255.255.255.0 notrust


# If you want to provide time to your local subnet, change the next line.
# (Again, the address is an example only.)
#broadcast 192.168.123.255

# If you want to listen to time broadcasts on your local subnet, de-comment the
# next lines.  Please do this only if you trust everybody on the network!
#disable auth
#broadcastclient
于 2016-03-30T02:39:48.440 回答