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howtos:network_services:ntp [2014/02/17 06:30 (UTC)] kikinovakhowtos:network_services:ntp [2014/02/17 21:13 (UTC)] kikinovak
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 <note tip>Again, you might have to wait a few minutes before the first synchronization takes place.</note> <note tip>Again, you might have to wait a few minutes before the first synchronization takes place.</note>
- 
-=== Synchronizing at boot time === 
- 
-If instead of using a daemon, all you want to do is to synchronize time once per boot, it is possible to add the command ''ntpd -qg &'' in the bottom of the file ''/etc/rc.d/rc.local''. This will synchronize the time once in the background and will exit and it needs ''/etc/rc.d/rc.ntpd'' to not be an executable. 
-   
-  ~# cat /etc/rc.d/rc.local 
-  #!/bin/sh 
-  # 
-  # /etc/rc.d/rc.local:  Local system initialization script. 
-  # 
-  # Put any local startup commands in here.  Also, if you have 
-  # anything that needs to be run at shutdown time you can 
-  # make an /etc/rc.d/rc.local_shutdown script and put those 
-  # commands in there. 
-  . 
-  . 
-  . 
-  ntpd -qg & 
      
 ===== Monitor the performance of ntpd ===== ===== Monitor the performance of ntpd =====
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 </code> </code>
  
-Given enough data, visual examination of the plots will allow you to see peculiarities in ''ntpd'' performance, should they arise. For example, in the case illustrated by [[http://www.astro.uni.wroc.pl/ludzie/drobek/ntp_time+freq.png|this figure]], the rapid decrease of the frequency offset was caused by replacing the power supply unit of the machine.+Given enough data, visual examination of the plots will allow you to see peculiarities in ''ntpd'' performance, should they arise. For example, in the case illustrated by the figure below, the rapid decrease of the frequency offset was caused by replacing the power supply unit of the machine. 
 + 
 +{{:howtos:network_services:ntp_time_freq.png|}}
  
 ====== Sources ====== ====== Sources ======
 howtos:network_services:ntp ()