Ben's notes

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--- pc_engines_apu_ublox_6_timing_gps_ntp [2015/01/06 09:37] – [Verify clients] admin
+++ pc_engines_apu_ublox_6_timing_gps_ntp [2015/01/24 17:39] – [Leap second file] admin
@@ Line 83: / Line 83: @@
 # By default, exchange time with everybody, but don't allow configuration.
-restrict -4 default kod notrap nomodify nopeer noquery
+restrict -4 default limited kod notrap nomodify nopeer noquery
-restrict -6 default kod notrap nomodify nopeer noquery
+restrict -6 default limited kod notrap nomodify nopeer noquery
 # Local users may interrogate the ntp server more closely.
@@ Line 92: / Line 92: @@
   * Disable automatic update of ntp package. Remember to update it yourself in case of security updates!<code>sudo apt-mark hold ntp ntp-doc</code>
   * Reboot and check results.
+====Leap second file====
+Automatic download of new leap second file.
+  * Install lftp. <code>apt-get install lftp</code>
+  * Create leap second download script: [[get_leap_script|/usr/local/bin/get_leap.sh]]
+  * Change executable mode <code>chmod +x /usr/local/bin/get_leap.sh</code>
+  * Download new file weekly. Create **/etc/cron.weekly/leapsecond** <code>#!/bin/bash
+/usr/local/bin/get_leap.sh</code>
+  * Change executable mode <code>chmod +x /etc/cron.weekly/leapsecond</code>
 ====Verify====
   * Make sure gpsd and ntpd start at boot. If not, enable it.<code>update-rc.d ntp enable
@@ Line 125: / Line 136: @@
 *SHM(0)          .GPSd.           0 l   16   16  377    0.000   -8.657   2.708
 </code>
-====Leap second file====
-Automatic download of new leap second file.
-  * Install lftp. <code>apt-get install lftp</code>
-  * Create leap second download script **/usr/local/bin/get_leap.sh** <code>#!/bin/bash
-# This script will download the latest leap second file,
-# update the NTP configuration and restart ntpd.
-# Leap second file location
-leapremote="ftp://time.nist.gov/pub/"
-#leapremote="ftp://tycho.usno.navy.mil/pub/ntp/"
-# Local file name
-leaplocaldir="/var/lib/ntp/"
-leaplocalfile="$leaplocaldir/leap-seconds"
-# Log file
-logfile=/var/log/getleap.log
-# Get latest leap second file
-/usr/bin/lftp -e 'set net:timeout 10 ; cls -1 --sort=date | head -1 > /tmp/leap ; exit' $leapremote
-if [ $? -ne 0 ]; then
-  echo "`date` - FTP problem, exiting." | tee -a $logfile
-  exit 1
-fi
-if [ -f "$leaplocaldir$(cat /tmp/leap)" ]; then
-  echo "`date` - File $leaplocaldir$(cat /tmp/leap) already exists. Not downloading." | tee -a $logfile
-else
-  cd "$leaplocaldir"
-  /usr/bin/lftp -e "set net:timeout 10 ; get $(cat /tmp/leap) ; exit" $leapremote
-  ln -sfn "$leaplocaldir$(cat /tmp/leap)" "$leaplocalfile"
-  if [ $? -eq 0 ]; then
-    echo "`date` - Leap second file downloaded." | tee -a $logfile
-  else
-    echo "`date` - Leap second file download problem." | tee -a $logfile
-    exit 1
-  fi
-  service ntp restart
-  if [ $? -eq 0 ]; then
-    echo "`date` - NTPd service restarted succesfully." | tee -a $logfile
-  else
-    echo "`date` - NTPd service restart problem!" | tee -a $logfile
-    exit 1
-  fi
-fi
-</code>
-  * Change executable mode <code>chmod +x /usr/local/bin/get_leap.sh</code>
-  * Download new file weekly. Create **/etc/cron.weekly/leapsecond** <code>#!/bin/bash
-/usr/local/bin/get_leap.sh</code>
-  * Change executable mode <code>chmod +x /etc/cron.weekly/leapsecond</code>
-====Verify====
   * Show connected clients:<code>ntpdc -c monlist</code>
   * Verify leap variables:<code>ntpq -c "rv 0"