Ntp Error Linux

Links RHEL NTP configuration Changing timezone in RHEL6 from the command line Redhat Network Configuration RHEL handling of DST change Configuration of Solaris NTP server Troubleshooting NTP on Solaris ILO 3 ntp troubleshooting linux NTP configuration Humor Etc Preliminary Steps Using ntpq -p command Using tcpdump Using

Ntp Drift File

syslog Be careful if your clock is ahead of time Note: Some versions of Red Hat Linux do not propagate ntp jitter NTP setting you put during installation to Anaconda. In this case you need to set up NTP manually after first reboot. Preliminary Steps Check if you have a correct timezone redhat.com How do I http://www.ntp.org/ntpfaq/NTP-s-trouble.htm change my system timezone from the command line without using redhat-config-date? In order to change the timezone of your system you need to edit /etc/sysconfig/clock: #ZONE="America/New_York" ZONE="GMT" UTC=true ARC=false Note: If your system's BIOS has UTC set to true, then set UTC to true.UTC setting in the configuration file must always reflect your actual BIOS settings. ... ... ... Finally save the file /etc/sysconfig/clock and on next reboot http://www.softpanorama.org/Net/Application_layer/NTP/troubleshooting_ntp_on_linux.shtml the system time will be set to the defined timezone.For the time on the machine to reflect the change timezone we need to link the zoneinfo file to /etc/localtime. This can be done as follows : # ln -sf /usr/share/zoneinfo/Brazil/East /etc/localtime Now by typing the date command to display the time you should see if reflect the newly linked timezone : # date Thu Sep 30 10:06:23 BRT 2004 Check if /etc/ntp/ntpservers contains NTP servers that you need and correct them if necessary (the default set are Red Hat NTP servers that might be not accessible because of firewall or proxy): vi /etc/ntp/ntpservers Run ntpdate to check if it will synchronize your clock with a time server. ntpd will not synchronize your clock with a time server if your system clock is significantly off NTP time. ntpdate -u 0.us.pool.ntp.org Check if ntpdis configured to start on the runlevels you work (typically 3 and 5). chkconfig ntpd on Try to start the ntpd daemon manually.service ntpd start Note: The graphical user interface utility redhat-config-date (Red Hat Linux) or system-config-date (Fedora Core) may also be used to administer NTP. Using ntpq -p command The most useful command for querying any time server's status is "n

Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack http://serverfault.com/questions/461752/ntpdate-and-ntpd-failing-to-sync-clock-on-linux Overflow the company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top ntpdate and ntp offset ntpd failing to sync clock on Linux up vote 10 down vote favorite 2 I have a strange problem with one of my servers. ntpd and ntpdate fail to work, but debugging shows no errors at all. At first I thought maybe a local or network firewall was blocking UDP port 123, but that is not the case- this server can talk UDP port 123 (the ntp protocol) to the Internet and ntp error linux get answers. Let me demonstrate the issue. date -s "30 DEC 2012 02:30:00" - works, so I can successfully set the clock without error. ntpq -pn pool.ntp.org - works, I do get detailed time data from the timeserver, and proves UDP packets are functioning. ntpdate -d pool.ntp.org - debug mode works, shows a ton of debug data and shows the current time offset: 30 Dec 02:38:56 ntpdate[19267]: step time server 208.97.140.69 offset 228.234554 sec All looks normal, until: ntpdate pool.ntp.org - after a 4.7 second pause, it returns: 30 Dec 02:41:29 ntpdate[19274]: no server suitable for synchronization found Similar problem running ntpd, it does not update the clock. After ntpd is started, ntpq -pn results in all refid's forever stuck on .INIT. which means they cannot sync. /var/lib/ntp/drift is the driftfile setting in ntp.conf, which is chmod 644 and owned by ntp:ntp, same as all my other systems. I tried a dozen other ntp time servers, disabled iptables firewall, and confirmed the datacenter is not filtering udp traffic. Any ideas what is stopping ntpd and ntpdate from syncing my clock? This is CentOS 6.3 x64 on a dedicated server with Intel CPU. ntp ntpd ntpdate share|improve this question edited Dec 30 '12 at 8:59 asked Dec 30 '12 at 8:54 Crash Override 2771211