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Trobleshooting NTP on Red Hat Linux

  1. Check if you have a correct timezone

    redhat.com How do I change my system timezone from the command line without using redhat-config-date?

    In order to change the timezone of your system you will need to access the file /etc/sysconfig/clock directly:

     
    #ZONE="America/New_York"
    ZONE="GMT"
    UTC=false
    ARC=false
    

    Note: If your system's BIOS has UTC set to true, then set UTC to true. If it has it set to false, set it to false. UTC in the configuration file must always reflect your BIOS settings.

    In order to get the particular zone you wish to use you must associate ZONE with a file located in /usr/share/zoneinfo. It is wise to note the directory structure because if you need to set the timezone to that of Shanghai which is located in the Asia directory you will then have to set your ZONE variable to the following :

    ZONE="Asia/Shanghai"
    Or perhaps you need to set the timezone to that of East Brazil :
    ZONE="Brazil/East"
    Finally save the file /etc/sysconfig/clock and on next reboot the system 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 :

    If you are setting your timezone to "Brazil/East" link the following file to /etc/localtime :
    # 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
  2. Check if /etc/ntp/conf contains NTP servers that you need

    vi /etc/ntp.conf
  3. 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
  4. Chack if ntpd  is configures to start on the runlevel you work (3 or 5).
    chkconfig ntpd on
     
  5. Try to start the ntpd daemon immediately.
    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.



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Last modified: July 26, 2012