add random crontab etc/cron.d/slapos slapupdate

slapprepare/slapprepare/script/slapos

@@ -26,6 +26,9 @@
 #
 ##############################################################################
 
+# for crontab /cron.d/slapos slapupdate
+import random
+
 systemctl stop slapos-node.service
 systemctl disable slapos-node.service
 
@@ -119,6 +122,9 @@ if [ $SLAPOS_GOOD_CONFIGURATION != $SLAPOS_CONFIGURATION ]; then
 fi
 
 # Set up cron
+# random crontab slapupdate
+let HOUR=$RANDOM%23;
+let MINUTE=$RANDOM%60;
 
 # Remove default route for ipv6 in case of openvpn-needed
 echo """# BEWARE: This file will be automatically regenerated on each boot
@@ -126,7 +132,7 @@ SHELL=/bin/sh
 PATH=/usr/bin:/usr/sbin:/sbin:/bin:/usr/lib/news/bin
 MAILTO=root
 
-0 0 * * * root /usr/local/bin/slapupdate -v --slapos-configuration $SLAPOS_CONFIGURATION/slapos.cfg >> /opt/slapos/slapupdate.log 2>&1
+$MINUTE $HOUR * * * root /usr/local/bin/slapupdate -v --slapos-configuration $SLAPOS_CONFIGURATION/slapos.cfg >> /opt/slapos/slapupdate.log 2>&1
 
 """> /etc/cron.d/slapos