Adding scripts...

README.md

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 autoscale
 =========
 
-Autoscale monitoring scripts
+Auto scale scripts

alarm criteria.txt

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+if (metric['sysload_avg'] < 2.0 && metric['percent_memory_used'] < 30 && metric['percent_maxclients'] < 30) {
+  return new AlarmStatus(CRITICAL, 'Auto Scale servers have been over provisioned. Auto #scale group is being scaled down!');
+}
+
+return new AlarmStatus(OK, 'Auto Scale servers are being used too heavily for safe scale down.');
+

scale_cron.sh

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+
+#!/bin/bash
+
+load=`sh /root/scaledown_check.sh | grep sysload_avg | awk '{print $4}'`
+mem=`sh /root/scaledown_check.sh | grep percent_memory_used | awk '{print $4}'`
+maxclients=`sh /root/scaledown_check.sh | grep percent_maxclients | awk '{print $4}'`
+
+if awk -v ld=$load 'BEGIN {exit !(ld < 2)}' && awk -v mem=$mem 'BEGIN {exit !(mem < 30)}' && awk -v cli=$maxclients 'BEGIN {exit !(cli < 30)}'
+then
+	echo `date` "Autoscale load check: Scaling DOWN by 1 server!"
+        curl -X POST https://iad.autoscale.api.rackspacecloud.com/v1.0/execute/1/13aa6c05ca918b7f0cf6f04336176e4b2ba7359ab44f7f9b555a7a72b7d088b5/
+else
+        echo `date` "Autoscale load check: Not ready for scale down"
+fi
+
+echo "  Average sysload = $load
+        Average memory use = $mem %
+        Average MaxClients use = $maxclients %"

scaledown_check.sh

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+#!/bin/bash
+
+# Example criteria :
+#
+#if (metric['sysload_avg'] < 2.0 && metric['percent_memory_used'] < 30 && metric['percent_maxclients'] < 30) {
+#  return new AlarmStatus(CRITICAL, 'Auto Scale servers have been over provisioned. Auto #scale group is being scaled down!');
+#}
+#
+#return new AlarmStatus(OK, 'Auto Scale servers are being used too heavily for safe scale down.');
+
+########################################################################################################################
+
+
+# Getting time parameters for sar command
+end=`date | awk '{ print $4}'`
+start=`date -d "1 hour ago" | awk '{ print $4}'`
+
+
+# Find average sysload from last hour
+sysloadavg=`sar -q -s $start -e $end | grep Average | tail -n 1 | tr -s ' ' | awk '{print $4}'`
+
+# Print metric system load
+echo "metric sysload_avg float" $sysloadavg
+
+
+########################################################################################################################
+
+
+# Setting proper values for average memory usage from last hour
+memfree=`sar -r -s $start -e $end | grep Average | tail -n 1 | tr -s ' ' | awk '{print $2}'`
+memused=`sar -r -s $start -e $end | grep Average | tail -n 1 | tr -s ' ' | awk '{print $3}'`
+memtotal=`awk -v memfree=$memfree -v memused=$memused 'BEGIN { print memfree + memused }'`
+buffers=`sar -r -s $start -e $end | grep Average | tail -n 1 | tr -s ' ' | awk '{print $5}'`
+cached=`sar -r -s $start -e $end | grep Average | tail -n 1 | tr -s ' ' | awk '{print $6}'`
+nocache=`awk -v memused=$memused -v buffers=$buffers -v cached=$cached 'BEGIN { print memused - ( buffers + cached ) }'`
+
+# Find use percentage
+mempercentage=`awk -v nocache=$nocache -v memtotal=$memtotal 'BEGIN { print nocache * 100 / memtotal }'`
+
+# Print metric memory
+echo "metric percent_memory_used float" $mempercentage
+
+
+########################################################################################################################
+
+
+# Find the number of active Apache clients
+activeconn=`pgrep -f "httpd|apache2" | wc -l`
+
+# Find the MaxClients setting from Apache config file
+if [ -f /etc/apache2/apache2.conf ]
+then
+        maxclients=`grep MaxClients /etc/apache2/apache2.conf | grep -v '#' | head -n 1 | awk '{print $2}'`
+elif [ -f /etc/httpd/conf/httpd.conf ]
+then
+        maxclients=`grep MaxClients /etc/httpd/conf/httpd.conf | grep -v '#' | head -n 1 | awk '{print $2}'`
+fi
+
+# Find use percentage
+maxclientuse=`awk -v ac=$activeconn -v mc=$maxclients 'BEGIN { print ac * 100 / mc }'`
+
+# Print metric maxclients
+echo "metric percent_maxclients float" $maxclientuse
+

scaledown_check.sh.withBC.sh

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+#!/bin/bash
+
+# Example criteria :
+#
+#if (metric['sysload_avg'] < 6.0 && metric['percent_memory_used'] < 30 && metric['percent_maxclients'] < 30) {
+#  return new AlarmStatus(CRITICAL, 'Auto Scale servers have been over provisioned. Auto #scale group is being scaled down!');
+#}
+#
+#return new AlarmStatus(OK, 'Auto Scale servers are being used too heavily for safe scale #down.');
+
+
+
+# Getting time parameters for sar command
+endtime=`date | gawk '{ print $4}'`
+starttime=`date -d "1 hour ago" | gawk '{ print $4}'`
+
+
+# Find average sysload from last hour
+sysloadavg=`sar -q -s $starttime -e $endtime | grep Average | tail -n 1 | tr -s ' ' | gawk '{print $4}'`
+
+# Print metric system load
+echo "metric sysload_avg float" $sysloadavg
+
+
+# Setting proper values for average memory usage from last hour
+kbmemfree=`sar -r -s $starttime -e $endtime | grep Average | tail -n 1 | tr -s ' ' | gawk '{print $2}'`
+kbmemused=`sar -r -s $starttime -e $endtime | grep Average | tail -n 1 | tr -s ' ' | gawk '{print $3}'`
+memtotal=`echo $kbmemfree + $kbmemused | bc`
+kbbuffers=`sar -r -s $starttime -e $endtime | grep Average | tail -n 1 | tr -s ' ' | gawk '{print $5}'`
+kbcached=`sar -r -s $starttime -e $endtime | grep Average | tail -n 1 | tr -s ' ' | gawk '{print $6}'`
+withoutcache=`echo $kbmemused - \($kbbuffers+$kbcached\) | bc`
+
+# Find use percentage
+mempercentage=`echo $withoutcache \* 100 / $memtotal | bc`
+
+# Print metric memory usage
+echo "metric percent_memory_used int" $mempercentage
+
+
+# Find the number of active Apache clients
+activeconn=`pgrep -f "httpd|apache2" | wc -l`
+
+# Find the MaxClients setting from Apache config file
+if [ -f /etc/apache2/apache2.conf ]
+then
+        maxclients=`grep MaxClients /etc/apache2/apache2.conf | grep -v '#' | head -n 1 | gawk '{print $2}'`
+elif [ -f /etc/httpd/conf/httpd.conf ]
+then
+        maxclients=`grep MaxClients /etc/httpd/conf/httpd.conf | grep -v '#' | head -n 1 | gawk '{print $2}'`
+fi
+
+# Find use percentage
+maxclientuse=`echo $activeconn \* 100 / $maxclients | bc`
+
+echo "metric percent_maxclients int" $maxclientuse