# Time Sync Issue **URL:** \ **Category:** Server operators\ **Created:** [April 6, 2017, 3:12am UTC](https://community.ntppool.org/t/time-sync-issue/183 "2017-04-06T03:12:53Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![steven](https://avatars.discourse-cdn.com/v4/letter/s/94ad74/32.png) [@steven](https://community.ntppool.org/u/steven)\ **Post date:** [April 6, 2017, 3:12am UTC](https://community.ntppool.org/t/time-sync-issue/183/1 "2017-04-06T03:12:53Z")
Hello, Good day to everyone . I got time sync issue recently by linux command “/usr/sbin/ntpdate [tw.pool.ntp.org](http://tw.pool.ntp.org)”. Here are some details : From root@twtpelpssdb01t Wed Apr 5 19:00:02 2017 Return-Path: [root@twtpelpssdb01t](mailto:root@twtpelpssdb01t) Received: from twtpelpssdb01t (localhost [127.0.0.1]) by twtpelpssdb01t (8.14.4/8.14.4) with ESMTP id v35B02jD030985 for [root@twtpelpssdb01t](mailto:root@twtpelpssdb01t); Wed, 5 Apr 2017 19:00:02 +0800 Received: (from root@localhost) by twtpelpssdb01t (8.14.4/8.14.4/Submit) id v35B02cc030984; Wed, 5 Apr 2017 19:00:02 +0800 Date: Wed, 5 Apr 2017 19:00:02 +0800 Message-Id: [201704051100.v35B02cc030984@twtpelpssdb01t](mailto:201704051100.v35B02cc030984@twtpelpssdb01t) From: root@twtpelpssdb01t (Cron Daemon) To: root@twtpelpssdb01t Subject: Cron [root@twtpelpssdb01t](mailto:root@twtpelpssdb01t) /usr/sbin/ntpdate [tw.pool.ntp.org](http://tw.pool.ntp.org) Content-Type: text/plain; charset=UTF-8 Auto-Submitted: auto-generated X-Cron-Env: \ X-Cron-Env: \ X-Cron-Env: \ X-Cron-Env: \ X-Cron-Env: \ 5 Apr 19:00:02 ntpdate[30982]: adjust time server 61.216.153.104 offset -0.006269 sec From root@twtpelpssdb01t Wed Apr 5 20:00:05 2017 Return-Path: [root@twtpelpssdb01t](mailto:root@twtpelpssdb01t) Received: from twtpelpssdb01t (localhost [127.0.0.1]) by twtpelpssdb01t (8.14.4/8.14.4) with ESMTP id v35C05t9002988 for [root@twtpelpssdb01t](mailto:root@twtpelpssdb01t); Wed, 5 Apr 2017 20:00:05 +0800 Received: (from root@localhost) by twtpelpssdb01t (8.14.4/8.14.4/Submit) id v35C05j7002966; Wed, 5 Apr 2017 20:00:05 +0800 Date: Wed, 5 Apr 2017 20:00:05 +0800 Message-Id: [201704051200.v35C05j7002966@twtpelpssdb01t](mailto:201704051200.v35C05j7002966@twtpelpssdb01t) From: root@twtpelpssdb01t (Cron Daemon) To: root@twtpelpssdb01t Subject: Cron [root@twtpelpssdb01t](mailto:root@twtpelpssdb01t) /usr/sbin/ntpdate [tw.pool.ntp.org](http://tw.pool.ntp.org) Content-Type: text/plain; charset=UTF-8 Auto-Submitted: auto-generated X-Cron-Env: \ X-Cron-Env: \ X-Cron-Env: \ X-Cron-Env: \ X-Cron-Env: \ **5 Apr 20:00:05 ntpdate[2931]: step time server 61.216.153.105 offset 2678399.804672 sec** From root@twtpelpssdb01t Wed Apr 5 20:00:09 2017 Return-Path: [root@twtpelpssdb01t](mailto:root@twtpelpssdb01t) Received: from twtpelpssdb01t (localhost [127.0.0.1]) by twtpelpssdb01t (8.14.4/8.14.4) with ESMTP id v35C09Q2003058 for [root@twtpelpssdb01t](mailto:root@twtpelpssdb01t); Wed, 5 Apr 2017 20:00:09 +0800 Received: (from root@localhost) by twtpelpssdb01t (8.14.4/8.14.4/Submit) id v35C09uQ003057; Wed, 5 Apr 2017 20:00:09 +0800 Date: Wed, 5 Apr 2017 20:00:09 +0800 Message-Id: [201704051200.v35C09uQ003057@twtpelpssdb01t](mailto:201704051200.v35C09uQ003057@twtpelpssdb01t) From: root@twtpelpssdb01t (Cron Daemon) To: root@twtpelpssdb01t Subject: Cron [root@twtpelpssdb01t](mailto:root@twtpelpssdb01t) /usr/sbin/ntpdate [tw.pool.ntp.org](http://tw.pool.ntp.org) Content-Type: text/plain; charset=UTF-8 Auto-Submitted: auto-generated X-Cron-Env: \ X-Cron-Env: \ X-Cron-Env: \ X-Cron-Env: \ X-Cron-Env: \ # 5 Apr 20:00:09 ntpdate[3011]: adjust time server 61.216.153.105 offset -0.000601 sec Any idea ??? Best Regards, Stevenstrong text ---
**Author:** ![mengzhuo](https://sea2.discourse-cdn.com/flex016/user_avatar/community.ntppool.org/mengzhuo/32/1869_2.png) [@mengzhuo](https://community.ntppool.org/u/mengzhuo)\ **Post date:** [April 6, 2017, 6:03am UTC](https://community.ntppool.org/t/time-sync-issue/183/2 "2017-04-06T06:03:53Z")
> [@steven](#): > > 11]: adjust time server 61.216.153.105 offset -0.000601 sec > > Any idea ??? you shouldn’t use cronjob ntpdate for time adjust, use ntpd instead ---
**Author:** ![hildeb](https://sea2.discourse-cdn.com/flex016/user_avatar/community.ntppool.org/hildeb/32/61_2.png) [@hildeb](https://community.ntppool.org/u/hildeb)\ **Post date:** [April 6, 2017, 12:39pm UTC](https://community.ntppool.org/t/time-sync-issue/183/3 "2017-04-06T12:39:34Z")
Use ntpdate (with multiple servers) ONCE and the start ntpd (also, with multiple servers). ntpdate will make the clock jump backwards, which is a bad thing. ---
**Author:** ![alica](https://sea2.discourse-cdn.com/flex016/user_avatar/community.ntppool.org/alica/32/337_2.png) [@alica](https://community.ntppool.org/u/alica)\ **Post date:** [April 6, 2017, 1:42pm UTC](https://community.ntppool.org/t/time-sync-issue/183/4 "2017-04-06T13:42:05Z")
Sadly there are still some outdated instruction teaching beginners to use cron+ntpdate to keep the time, like the [vbird article](http://linux.vbird.org/linux_server/0440ntp.php#client_linux) (in Chinese). ---
**Author:** ![steven](https://avatars.discourse-cdn.com/v4/letter/s/94ad74/32.png) [@steven](https://community.ntppool.org/u/steven)\ **Post date:** [April 6, 2017, 2:38pm UTC](https://community.ntppool.org/t/time-sync-issue/183/5 "2017-04-06T14:38:28Z")
Actually, we used ntp daemon to sync time for our RAC envs,but still got big differences among RAC nodes. And then we adapted to use ntp command. I am wondering why you said “sad”. Post my comments here is to check anything wrong with the server pools. If you are not the owner, just save your words. -------- 原始訊息 --------自： CS Chen [ntppool@discoursemail.com](mailto:ntppool@discoursemail.com) 日期： 2017/4/6 21:52 (GMT+08:00) 至： [stevenchang1213@gmail.com](mailto:stevenchang1213@gmail.com) 主旨： [NTP Pool Project] [Server operators] Time Sync Issue ``` alica April 6 Sadly there are still some outdated instruction teaching beginners to use cron+ntpdate to keep the time, like the vbird article (in Chinese). ``` Visit Topic or reply to this email to respond. To unsubscribe from these emails, click here. ---
**Author:** ![randy](https://sea2.discourse-cdn.com/flex016/user_avatar/community.ntppool.org/randy/32/53_2.png) [@randy](https://community.ntppool.org/u/randy)\ **Post date:** [April 6, 2017, 4:39pm UTC](https://community.ntppool.org/t/time-sync-issue/183/6 "2017-04-06T16:39:11Z")
Hi Steven I am this server operators (61.216.153.104, 61.216.153.105), i don’t know why you has big time differences. if use ntp daemon still has this problem, maybe check your environment first. my ntp upstream from stdtime.gov.tw > server tick.stdtime.gov.tw iburst > server tock.stdtime.gov.tw iburst > server clock.stdtime.gov.tw iburst > server watch.stdtime.gov.tw iburst > server time.stdtime.gov.tw iburst **Howto use [pool.ntp.org](http://pool.ntp.org)** [pool.ntp.org: 我能如何安装 NTP 以使用NTP池？](http://www.pool.ntp.org/zh/use.html) ---
**Author:** ![steven](https://avatars.discourse-cdn.com/v4/letter/s/94ad74/32.png) [@steven](https://community.ntppool.org/u/steven)\ **Post date:** [April 7, 2017, 12:18am UTC](https://community.ntppool.org/t/time-sync-issue/183/7 "2017-04-07T00:18:00Z")
Roger 從我的 Samsung Galaxy 智慧型手機傳送。 -------- 原始訊息 --------自： Randy Wong [ntppool@discoursemail.com](mailto:ntppool@discoursemail.com) 日期： 2017/4/7 00:49 (GMT+08:00) 至： [stevenchang1213@gmail.com](mailto:stevenchang1213@gmail.com) 主旨： [NTP Pool Project] [Server operators] Time Sync Issue ``` randy April 6 ``` Hi Steven I am this server operators (61.216.153.104, 61.216.153.105), i don’t know why you has big time differences. if use ntp daemon still has this problem, maybe check your environment first. my ntp upstream from [stdtime.gov.tw](http://stdtime.gov.tw) server [tick.stdtime.gov.tw](http://tick.stdtime.gov.tw) iburst server [tock.stdtime.gov.tw](http://tock.stdtime.gov.tw) iburst server [clock.stdtime.gov.tw](http://clock.stdtime.gov.tw) iburst server [watch.stdtime.gov.tw](http://watch.stdtime.gov.tw) iburst server [time.stdtime.gov.tw](http://time.stdtime.gov.tw) iburst Visit Topic or reply to this email to respond. To unsubscribe from these emails, click here. ---
**Author:** ![steven](https://avatars.discourse-cdn.com/v4/letter/s/94ad74/32.png) [@steven](https://community.ntppool.org/u/steven)\ **Post date:** [April 7, 2017, 1:58am UTC](https://community.ntppool.org/t/time-sync-issue/183/8 "2017-04-07T01:58:43Z")
Hello Ralf, ``` tw.pool.ntp.org is already a server pool . Here is my debugging output : ``` [root@twtpelpssdb01t ~]# ntpdate -q [tw.pool.ntp.org](http://tw.pool.ntp.org) server 61.216.153.107, stratum 3, offset 0.001884, delay 0.03125 server 103.18.128.60, stratum 2, offset 0.002737, delay 0.02943 server 61.216.153.104, stratum 3, offset 0.001884, delay 0.02963 7 Apr 09:55:02 ntpdate[6302]: adjust time server 103.18.128.60 offset 0.002737 sec ``` Anyway thanks for your paying attention on my post. ``` BR, Steven ---
**Author:** ![steven](https://avatars.discourse-cdn.com/v4/letter/s/94ad74/32.png) [@steven](https://community.ntppool.org/u/steven)\ **Post date:** [April 7, 2017, 2:29am UTC](https://community.ntppool.org/t/time-sync-issue/183/9 "2017-04-07T02:29:23Z")
Hello mengzhuo [https://community.ntppool.org/users/mengzhuo](https://community.ntppool.org/users/mengzhuo), ``` I know nptd is a better way to sync time, but sometimes it's not ``` technical issue. OK… I will use the following command for debugging further. /usr/sbin/ntpdate -dB 10.36.15.1 [watch.stdtime.gov.tw](http://watch.stdtime.gov.tw) [tock.stdtime.gov.tw](http://tock.stdtime.gov.tw) 10.36.1.2 Actually, I doubt the hardware issue, because only this RAC group got probjlems. For god sake, I just do my jobs. Thanks for your paying attentions. BR, Steven