ntp是否有效？

Question

我不明白ntpd的输出。

我的问题是:服务器foohost是否能够从30.251.32.1获得时间？

这是我的配置：

foohost:/var/log # cat /etc/ntp.conf 
tinker panic 0
disable monitor
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
restrict 127.0.0.1
restrict -6 ::1
driftfile /var/lib/ntp/drift/driftfile
broadcastdelay 0.008
server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 10
server 30.251.32.1 version 2

重新启动: systemctl重新启动ntpd.service

伐木：

Aug 24 10:02:36 foohost systemd[1]: Stopping NTP Server Daemon...
Aug 24 10:02:37 foohost systemd[1]: Stopped NTP Server Daemon.
Aug 24 10:02:37 foohost systemd[1]: Starting NTP Server Daemon...
Aug 24 10:02:37 foohost ntpd[28272]: ntpd 4.2.8p10@1.3728-o Thu May 18 14:01:20 UTC 2017 (1): Starting
Aug 24 10:02:37 foohost ntpd[28272]: Command line: /usr/sbin/ntpd -p /var/run/ntp/ntpd.pid -g -u ntp:ntp -c /etc/ntp.conf
Aug 24 10:02:37 foohost ntpd[28273]: proto: precision = 0.053 usec (-24)
Aug 24 10:02:37 foohost ntpd[28273]: restrict default: KOD does nothing without LIMITED.
Aug 24 10:02:37 foohost ntpd[28273]: restrict ::: KOD does nothing without LIMITED.
Aug 24 10:02:37 foohost ntpd[28273]: Listen and drop on 0 v6wildcard [::]:123
Aug 24 10:02:37 foohost ntpd[28273]: Listen and drop on 1 v4wildcard 0.0.0.0:123
Aug 24 10:02:37 foohost ntpd[28273]: Listen normally on 2 lo 127.0.0.1:123
Aug 24 10:02:37 foohost ntpd[28273]: Listen normally on 3 eth0 30.251.32.11:123
Aug 24 10:02:37 foohost ntpd[28273]: Listen normally on 4 eth0:byoip 10.172.19.11:123
Aug 24 10:02:37 foohost ntpd[28273]: Listen normally on 5 lo [::1]:123
Aug 24 10:02:37 foohost ntpd[28273]: Listen normally on 6 eth0 [fe80::250:56ff:fe30:94%2]:123
Aug 24 10:02:37 foohost ntpd[28273]: Listening on routing socket on fd #23 for interface updates
Aug 24 10:02:37 foohost start-ntpd[28267]: Starting network time protocol daemon (NTPD)
Aug 24 10:02:37 foohost systemd[1]: Started NTP Server Daemon.

服务器页主机能够从30.251.32.1获得时间吗？

Answer 1

如果@Sirch的答案太难读，您可以始终使用ntpstat。

例如：

> ntpstat
synchronised to NTP server (185.233.106.45) at stratum 3
   time correct to within 39 ms
   polling server every 1024 s

甚至“更容易”：timedatectl status。

> timedatectl status
      Local time: Fri 2018-08-24 10:35:05 CEST
  Universal time: Fri 2018-08-24 08:35:05 UTC
        RTC time: Fri 2018-08-24 08:35:05
       Time zone: Europe/Berlin (CEST, +0200)
 Network time on: yes
NTP synchronized: yes
 RTC in local TZ: no

当然，你还得了解一些基本知识。

Answer 2

一种简单的观察方式是：

ntpq -c peers 

您将看到在过去的15次尝试中，与哪些服务器进行了联系，多久前，以及它们响应了多少次。