System Time VI

Tracking NTP Daemon 

Once the NTP daemon has been started, you can use two commands to keep track of how the
ntpd daemon is working:



1) ntpq –p 

  This command queries the status of the ntpd daemon. Here is an example:
  openSUSE:~ # ntpq –p
  remote refid st t when poll reach delay offset jitter
  ==============================================================================
  *LOCAL(0) .LOCL. 10 l 14 64 3 0.000 0.000 0.001
  helium.constant 18.26.4.105 2 u 12 64 1 96.614 -31.777 0.001

  The columns in the output include the following:


  • remote 
    Specifies the hostname or IP address of the time provider.
 
  • refid
    Specifies the type of the reference source.

  • st 
    Specifies the stratum of the time provider.

  • when
    Specifies the number of seconds since the last time poll.

  • poll 
    Specifies the number of seconds between two time polls.

  • reach 
    Displays whether or not the time server was reached in the last poll. Each
    successful poll increments this field by 1.

  • delay 
     Specifies the time (in milliseconds) that it took for the time provider to
     respond to the request.

  • offset 
    Specifies the time difference between the local system clock and the time
    provider (in milliseconds).

  •jitter 
    Specifies the size of time discrepancies (in milliseconds).



2) ntptrace 

   The ntptrace utility traces how the time consumer is receiving time from the 
   provider. It lists the time provider’s name, its stratum, and its time offset from the system 
   clock on the local system.




LX0-104 Exam Objectives (N)