Hi Thierry,
Thierry Dumont schrieb am 30. Sep 2010 um 14:20:25 CEST:
> The idea is that we only need some sort of very simple load balancing:
I use such a simple load balancing via get_hosts since years.
In my lts.conf I have a (self created) variable:
OTS_SERVERS = ots-v1 ots-v2 ots-v3
Additionally you have to remove any LDM_SERVER entries.
Then I have this get_hosts script at /opt/ltsp/i386/usr/lib/ltsp/:
==============================================================================
#!/bin/bash
##############################################################################
# $Id: get_hosts,v 1.1 2008-08-05 10:49:55 heli Exp $
##############################################################################
LOGFILE=/tmp/ots-serverlist
echo `date` >$LOGFILE
LIST=""
# Load query on all servers
for i in $OTS_SERVERS; do
LOAD=`nc $i 9571|grep rating|cut -d: -f2`
if test $LOAD; then
# add to the list
LIST="$LIST$LOAD $i\n"
fi
done
# Now LIST contains the list of servers sorted by load
LIST=`echo -e $LIST | sort -nr`
echo $LIST >>$LOGFILE
# Check if the 1st items have the same load. If so, randomly choose one.
OLDIFS=$IFS
IFS="
"
BESTLIST=( )
I=0
for LINE in $LIST ;do
LOAD=`echo $LINE|cut -f 1 -d " "`
if [ "$OLDLOAD" -a "$LOAD" != "$OLDLOAD" ] ;then
break
fi
BESTLIST[$I]="$LINE"
OLDLOAD=$LOAD
I=$((I+1))
done
RAND=$(( $RANDOM % $I ))
# print the choosen host
echo ${BESTLIST[$RAND]} | cut -f 2 -d " "
# and again into the file:
echo The very best: >>$LOGFILE
echo ${BESTLIST[$RAND]} | cut -f 2 -d " " >>$LOGFILE
exit 0
==============================================================================
Save it as /opt/ltsp/i386/usr/lib/ltsp/get_hosts and chmod it 755.
Enjoy
Helmut
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Helmut Lichtenberg <[email protected]> Tel.: 05034/871-128
Institut für Nutztiergenetik (FLI) 31535 Neustadt Germany
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