Min erfarenhet är att Raspbian (Debian för Raspberry Pi) default söker efter välkända NTP-servrar o synkar automatiskt?
[relaterade rader från min icke-moddade /etc/ntp.conf]
# pool.ntp.org maps to about 1000 low-stratum NTP servers. Your server will
# pick a different set every time it starts up. Please consider joining the
# pool: <http://www.pool.ntp.org/join.html>
server 0.debian.pool.ntp.org iburst
server 1.debian.pool.ntp.org iburst
server 2.debian.pool.ntp.org iburst
server 3.debian.pool.ntp.org iburst
Har bara haft problem om internetuppkopplingen låg nere vid senaste reboot, annars fungerar det klockrent för mina pajer.
- Problem med DNS?
- Problem med internetuppkopplingen?
- Port 123 (UDP) spärrad i brandväggen?
Går NTP servicen? Kan du starta om den?
$ sudo service ntp status
[ ok ] NTP server is running.
$ sudo service ntp restart
[ ok ] Stopping NTP server: ntpd.
[ ok ] Starting NTP server: ntpd.
Kolla DNS / namnuppslagning
$ sudo apt-get install dnsutils
$ dig 0.debian.pool.ntp.org
; <<>> DiG 9.8.4-rpz2+rl005.12-P1 <<>> 0.debian.pool.ntp.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63804
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;0.debian.pool.ntp.org. IN A
;; ANSWER SECTION:
0.debian.pool.ntp.org. 59 IN A 194.71.144.71
0.debian.pool.ntp.org. 59 IN A 94.245.35.13
0.debian.pool.ntp.org. 59 IN A 217.75.106.216
;; Query time: 27 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Tue Dec 16 17:28:32 2014
;; MSG SIZE rcvd: 87
Felutskrifter från ntpd?
$ grep ntpd /var/log/daemon.log
Dec 16 17:17:23 RPI1 ntpd[2089]: ntpd 4.2.6p5@1.2349-o Fri May 18 20:30:57 UTC 2012 (1)
Dec 16 17:17:23 RPI1 ntpd[2093]: proto: precision = 1.000 usec
Dec 16 17:17:23 RPI1 ntpd[2093]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123
Dec 16 17:17:23 RPI1 ntpd[2093]: Listen normally on 1 lo 127.0.0.1 UDP 123
Dec 16 17:17:23 RPI1 ntpd[2093]: Listen normally on 2 eth0 192.168.1.121 UDP 123
Dec 16 17:17:23 RPI1 ntpd[2093]: peers refreshed
Dec 16 17:17:23 RPI1 ntpd[2093]: Listening on routing socket on fd #19 for interface updates
Dec 16 17:17:23 RPI1 ntpd[2093]: restrict: error in address '::' on line 38. Ignoring...
Dec 16 17:17:23 RPI1 ntpd[2093]: restrict: error in address '::1' on line 42. Ignoring...
Dec 16 19:24:59 RPI1 ntpd[2093]: ntpd exiting on signal 15 (Här startar jag om den med sudo service ntp restart)
Dec 16 19:25:01 RPI1 ntpd[10070]: ntpd 4.2.6p5@1.2349-o Fri May 18 20:30:57 UTC 2012 (1)
Dec 16 19:25:01 RPI1 ntpd[10071]: proto: precision = 1.000 usec
Dec 16 19:25:01 RPI1 ntpd[10071]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123
Dec 16 19:25:01 RPI1 ntpd[10071]: Listen normally on 1 lo 127.0.0.1 UDP 123
Dec 16 19:25:01 RPI1 ntpd[10071]: Listen normally on 2 eth0 192.168.1.121 UDP 123
Dec 16 19:25:01 RPI1 ntpd[10071]: peers refreshed
Dec 16 19:25:01 RPI1 ntpd[10071]: Listening on routing socket on fd #19 for interface updates
Dec 16 19:25:01 RPI1 ntpd[10071]: restrict: error in address '::' on line 38. Ignoring...
Dec 16 19:25:01 RPI1 ntpd[10071]: restrict: error in address '::1' on line 42. Ignoring...
Ladda hem nätverkssniffer o kolla vad som händer på nätverket?
$ sudo apt-get install tcpdump
$ sudo tcpdump -i eth0 udp port 123
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
17:22:29.082647 IP 192.168.1.121.ntp > Time4.Stupi.SE.ntp: NTPv4, Client, length 48
17:22:29.085928 IP Time4.Stupi.SE.ntp > 192.168.1.121.ntp: NTPv4, Server, length 48
/f