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--- the_ntp_functions [2017/03/17 18:34] – [Edit NTP Configuration File] walkeradmin
+++ the_ntp_functions [2023/03/09 22:35] (current) – external edit 127.0.0.1
@@ Line 135: / Line 135: @@
 \\
+----
+==== Restart NTP ====
+\\
+To get the Raspberry Pi to sync, we can restart the NTP service. Use the following to restart the NTP server.
+\\
+    sudo service ntp restart
+\\
+\\
+Now check the current time and date using the <color #ed1c24>date</color> command.
+\\
+    date
+    Fri 17 Mar 18:38:59 UTC 2017
+\\
+If the time and date are correct, then you are good to go.
+\\
+\\
+----
+==== Check NTP Servers ====
+\\
+You can test to see if NTP on the Raspberry Pi is actually using any external time servers by using the <color #ed1c24>ntpq -pn</color> command.
+\\
+<file>
+ntpq -pn
+     remote           refid      st t when poll reach   delay   offset  jitter
+==============================================================================
+*130.159.196.118 193.62.22.90     2 u   78   64   36   61.470  -17.318  15.763
+.129.190.21   85.199.214.102   2 u    9   64   37   13.979    0.712   0.680
+.124.126.49   195.66.241.10    2 u    9   64   37   15.417    1.572   3.078
+.146.137.13  82.148.230.254   2 u    8   64   37   42.823   -1.197   2.624
+</file>
+\\
+After running the command <color #ed1c24>ntpq -pn</color> you should see a list of time servers (by IP) that the NTP service on the Raspberry Pi has connected to. The IP Address with the asterisk <color #ed1c24>*</color> next to it is the last server the Raspberry Pi did a time sync with.
+\\
+\\
+----
+==== Synchronising Clients ====
+\\
+** LINUX **
+\\
+\\
+Synchronising <color #ed1c24>Linux</color> clients is pretty much the same as we have already done, except in the <color #ed1c24>/etc/ntp.conf</color> instead of putting internet time servers, you just enter the internal IP address of your NTP server.
+\\
+\\
+** WINDOWS **
+\\
+\\
+For <color #ed1c24>Windows</color> PCs we will have to set the NTP server in the time settings. To do this, first right click the clock in the bottom right hand side of the screen.
+\\
+\\
+{{:ntp01.jpg?400|}}
+\\
+\\
+Select 'Adjust date/time'
+\\
+\\
+When the next page opens, scroll down.
+\\
+\\
+{{:ntp02.jpg?700|}}
+\\
+\\
+Select 'Additional date, time, & regional settings'
+\\
+\\
+When the next page opens.
+\\
+\\
+{{:ntp03.jpg?700|}}
+\\
+\\
+Select 'Set the time and date'
+\\
+\\
+On the next page.
+\\
+\\
+{{:ntp04.jpg?400|}}
+\\
+\\
+Select the 'Internet Time' tab.
+\\
+\\
+On the next page.
+\\
+\\
+{{:ntp05.jpg?400|}}
+\\
+\\
+Select the Change Settings button.
+\\
+\\
+On the next page we will see a box that contains <color #ed1c24>time.windows.com</color>
+\\
+\\
+{{:ntp07.jpg?400|}}
+\\
+\\
+Change the contents of this box to the IP Address of the Raspberry Pi running the NTP server.
+\\
+\\
+Finally, Click the <color #ed1c24>Update</color> Button.
+\\
+\\
+{{:ntp08.jpg?400|}}
+\\
+\\
+The time should now be updated, you will see confirmation in this page (I have to do this twice sometimes)
+\\
+\\
+That's it.
+\\
+\\
+----
+==== Clients over 1000 Seconds out of time ====
+\\
+“NTP won’t normally reset the clock if it’s off by more than 1000s. If you run:
+<file>
+ntpd -gq’
+</file>
+It ignores the clock being way adrift from ntp time and will force it to be correct then close. The old ntpdate program does the same thing.”
+\\
+\\
+Credit: [[http://www.raspberrypi.org/phpBB3/viewtopic.php?f=91&t=16058|External Link]]
+\\
+\\
+----
+==== Raspberry Pi Dropping of Wireless Network ====
+I found my raspberry Pi Zero, that is using the official Raspberry Pi Wireless Dongle drops off the wireless network after around a week. Only a reboot gets it back (as I have no keyb/mouse connected) so I figured just using Cron to reboot the thing every 24 hours will be a suitable work around.
+\\
+\\
+To use cron (should already be installed):
+\\
+\\
+    sudo crontab -e (reboots require super user rights)
+\\
+Insert the following line:
+\\
+\\
+0   *   *   *    /sbin/shutdown -r
+\\
+Explanation:
+\\
+\\
+<file>
+m      h    dom        mon   dow       command
+minute hour dayOfMonth Month dayOfWeek commandToRun
+so the line
+0   *   *   *    /sbin/shutdown -r
+would reboot your system every day at 00:00.
+</file>
+\\
+Use Ctrl+X, Y, Enter. This will save and exit crontab (if using nano)
+\\
+\\
-<sxh [txt][; options for SyntaxHighlighter]>
-==============================================================================
-.250.35.250  249.224.99.213   2 u   17   64    1   14.476   -0.987   0.001
-.74.206.120  129.69.1.153     2 u   16   64    1   11.470   -2.075   0.001
-.101.52.119   81.174.136.35    2 u   15   64    1   12.037   -0.254   0.001
-.213.34.249  145.238.203.14   2 u   14   64    1   11.887   -0.114   0.001
-pi@PiNTP:~ $ date +"%FT%T%Z"
--01-22T20:20:22UTC
-pi@PiNTP:~ $ date
-Sun 22 Jan 20:20:28 UTC 2017
-pi@PiNTP:~ $ ntpq -pn
-     remote           refid      st t when poll reach   delay   offset  jitter
-==============================================================================
-.250.35.250  249.224.99.213   2 u   17   64    3   12.131   -0.813   0.173
-.74.206.120  129.69.1.153     2 u   19   64    3   17.051   -5.251   3.175
-.101.52.119   81.174.136.35    2 u   17   64    3   12.437   -0.767   0.513
-.213.34.249  145.238.203.14   2 u   17   64    3   12.664   -0.506   0.392
-pi@PiNTP:~ $ ntpq -pn
-     remote           refid      st t when poll reach   delay   offset  jitter
-==============================================================================
-*129.250.35.250  249.224.99.213   2 u   21   64  177   10.248    0.334   0.864
--109.74.206.120  129.69.1.153     2 u   23   64  177   10.696   -1.835   8.592
-+46.101.52.119   81.174.136.35    2 u   18   64  167   11.125    0.393   0.716
-+162.213.34.249  193.79.237.14    2 u   15   64  177   11.887   -0.114   2.181
-</sxh>