ntpdate提示
19 Jan 10:33:11 ntpdate[29616]: no server suitable for synchronization found
這種問題從下面幾個點開始驗證
1.查看防火牆是否開通udp的123端口，是udp 無法使用telnet來驗證，只能看iptables和硬牆是否有策略
2.如果端口開通，查看服務器端的ntp.conf文件中server是否正常，如果配置有問題，肯定無法使用
3.修改配置是否重新啟動ntpd服務
4.查看服務端ntpd進程是否正常
ntpdate -d ntp服務端ip
遇到的幾個問題
1.Server dropped:no data
處理辦法：網絡不通，檢查防火牆的udp端口123是否能用，查看服務端的ntpd服務是否啟動
[root@ip-192.168.25.10 ~]# ntpdate -d 192.168.25.10 19 Jan 10:24:16 ntpdate[27838]: ntpdate 4.2.6p5@1.2349-o Tue Jun 23 15:38:19 UTC 2020 (1) Looking for host 192.168.25.10 and service ntp host found : ip-192.168.25.10.ap-southeast-1.compute.internal transmit(192.168.25.10) transmit(192.168.25.10) transmit(192.168.25.10) transmit(192.168.25.10) transmit(192.168.25.10) 192.168.25.10: Server dropped: no data server 192.168.25.10, port 123 stratum 0, precision 0, leap 00, trust 000 refid [192.168.25.10], delay 0.00000, dispersion 64.00000 ansmitted 4, in filter 4 ▽ference time: 00000000.00000000 Mon, Jan 1 1900 8:05:43.000 originate timestamp: 00000000.00000000 Mon, Jan 1 1900 8:05:43.000 transmit timestamp: e3b0c156.2402fb9d Tue, Jan 19 2021 10:24:22.140 filter delay: 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 filter offset: 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 delay 0.00000, dispersion 64.00000 offset 0.000000 19 Jan 10:24:24 ntpdate[27838]: no server suitable for synchronization found
2.Server dropped: strata too high
這個問題一般都是server端ntp.conf中server行配置了網絡ntp的服務端url導致，可以收到ntp的包，但是延遲很高。
1 [root@ip-192.168.25.10 ~]# ntpdate -d 192.168.25.10 2 19 Jan 10:33:32 ntpdate[29681]: ntpdate 4.2.6p5@1.2349-o Tue Jun 23 15:38:19 UTC 2020 (1) 3 Looking for host 192.168.25.10 and service ntp 4 host found : ip-192.168.25.10.ap-southeast-1.compute.internal 5 transmit(192.168.25.10) 6 receive(192.168.25.10) 7 transmit(192.168.25.10) 8 receive(192.168.25.10) 9 transmit(192.168.25.10) 10 receive(192.168.25.10) 11 transmit(192.168.25.10) 12 receive(192.168.25.10) 13 192.168.25.10: Server dropped: strata too high 14 server 192.168.25.10, port 123 15 stratum 16, precision -24, leap 11, trust 000 16 refid [192.168.25.10], delay 0.02573, dispersion 0.00000 17 transmitted 4, in filter 4 18 reference time: 00000000.00000000 Mon, Jan 1 1900 8:05:43.000 19 originate timestamp: e3b0c382.6344a1b6 Tue, Jan 19 2021 10:33:38.387 20 transmit timestamp: e3b0c382.670289fb Tue, Jan 19 2021 10:33:38.402 21 filter delay: 0.02574 0.02573 0.02574 0.02573 22 0.00000 0.00000 0.00000 0.00000 23 filter offset: -0.01470 -0.01471 -0.01471 -0.01471 24 0.000000 0.000000 0.000000 0.000000 25 delay 0.02573, dispersion 0.00000 26 offset -0.014712 27 28 19 Jan 10:33:38 ntpdate[29681]: no server suitable for synchronization found
解決辦法就是將服務端也開啟ntpdate 然后通過ntpdate鏈接網絡url的ntp服務器，然后在ntp.conf中配置server 127.127.1.0 （記住 不是127.0.0.1 這個無效）
在打開ntpq -p 查看是否轉為LOCAL了
[root@ip-192.168.25.10 ~]# ntpq -p remote refid st t when poll reach delay offset jitter ============================================================================== *LOCAL(0) .LOCL. 8 l 11 64 17 0.000 0.000 0.000
正確的ntpdate -d 應該是下面的
1 [root@ip-192.168.25.10 ~]# ntpdate -d 192.168.25.10 2 19 Jan 10:35:25 ntpdate[30125]: ntpdate 4.2.6p5@1.2349-o Tue Jun 23 15:38:19 UTC 2020 (1) 3 Looking for host 192.168.25.10 and service ntp 4 host found : ip-192.168.25.10.ap-southeast-1.compute.internal 5 transmit(192.168.25.10) 6 receive(192.168.25.10) 7 transmit(192.168.25.10) 8 receive(192.168.25.10) 9 transmit(192.168.25.10) 10 receive(192.168.25.10) 11 transmit(192.168.25.10) 12 receive(192.168.25.10) 13 server 192.168.25.10, port 123 14 stratum 6, precision -24, leap 00, trust 000 15 refid [192.168.25.10], delay 0.02574, dispersion 0.00000 16 transmitted 4, in filter 4 17 reference time: e3b0c3eb.878bf296 Tue, Jan 19 2021 10:35:23.529 18 originate timestamp: e3b0c3f3.442fd9c7 Tue, Jan 19 2021 10:35:31.266 19 transmit timestamp: e3b0c3f3.47e920c0 Tue, Jan 19 2021 10:35:31.280 20 filter delay: 0.02574 0.02574 0.02574 0.02576 21 0.00000 0.00000 0.00000 0.00000 22 filter offset: -0.01465 -0.01465 -0.01465 -0.01466 23 0.000000 0.000000 0.000000 0.000000 24 delay 0.02574, dispersion 0.00000 25 offset -0.014652 26 27 19 Jan 10:35:31 ntpdate[30125]: adjust time server 192.168.25.10 offset -0.014652 sec
ps:以上ip均已做脫敏處理