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check aws elb hosts

September 2nd, 2013 Leave a comment Go to comments

This scripts counts how many active instances are inService of a AWS ElasticLoadBalancer (ELB).

The code is based on a simple API call via bash
elb-describe-instance-health

Here is the code:


#!/bin/bash
#This script uses AWS command line tools to get information from AWS ELB
#Should be used with nagios
#by Felipe Ferreira Set 2013

#Requirements: AWS tools installed and working without asking for password (how to setup)
#Requirements-link = http://felipeferreira.net/?p=1341

#SET EC2 CMDS (CONFIGURE HERE)
export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk.x86_64/
export AWS_AUTO_SCALING_HOME=/opt/AutoScaling
export AWS_CLOUDWATCH_HOME=/opt/cloudwatch
export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk.x86_64/
export AWS_CREDENTIAL_FILE=/opt/AutoScaling/key.txt
export AWS_ELB_HOME=/opt/elbtools
export PATH=$PATH:$AWS_AUTO_SCALING_HOME/bin:$EC2_HOME/bin:$AWS_CLOUDWATCH_HOME/bin:AWS_ELB_HOME:AWS_ELB_HOME/bin

VERBOSE=1
outputDebug() {
    if [ $VERBOSE -gt 0 ] ; then
        echo -e "$1"
    fi
}
if [ $# -eq 0 ] ; then
    TEMP="-h"
else
    TEMP=`getopt -o vh -l 'versbose,help,l:,w:,c:' -- "$@"`
fi

outputDebug "Processing Args $TEMP"
if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi
eval set -- "$TEMP"
while true ; do
    case "$1" in
        -v|--verbose) VERBOSE=1 ; outputDebug "Verbose Mode ON" ; shift ;;
        -h|--help) echo "Usage: $0 [--l ELASTICLAOADBANCE  [--w WARN] [--c CRITICAL]  [-v|--verbose] " ; exit 0;;
        --l) outputDebug "Option $1 is $2" ; ELB=$2 ; shift 2;;
        --w) outputDebug "Option $1 is $2" ; WARN=$2 ; shift 2;;
        --c) outputDebug "Option $1 is $2" ; CRIT=$2 ; shift 2;;
        --) shift ; break ;;
        *) echo "Internal error! - found $1 and $2" ; exit 3 ;;
    esac
done


CMD="/opt/elbtools/bin/elb-describe-instance-health $ELB |grep -c InService"
outputDebug "Executing: \n $CMD"

RESULT=`eval ${CMD}`
outputDebug "Result of cmd is: $RESULT"

if [ $RESULT -gt $CRIT ] || [ $RESULT -eq 0 ] || [ -z $RESULT ]; then
   echo "CRITICAL - ELB $ELB has ${RESULT} instances InService |ELB=$RESULT"
   exit 2
elif [ $RESULT -gt $WARN ]; then
   echo "WARNING - ELB $ELB has ${RESULT} instances InService |ELB=$RESULT"
   exit 1
else
   echo "OK - ELB $ELB has ${RESULT} instances InService |ELB=$RESULT"
   exit 0
fi

  1. Joe
    May 1st, 2014 at 14:37 | #1

    Hi,

    Thanks for this. Made a quick change though as it did not seem to be giving me the desired result.

    if [ $CRIT -gt $RESULT ] || [ $RESULT -eq 0 ] || [ -z $RESULT ]; then
    echo “CRITICAL – ELB $ELB has ${RESULT} instances InService |ELB=$RESULT”
    exit 2
    elif [ $WARN -gt $RESULT ]; then
    echo “WARNING – ELB $ELB has ${RESULT} instances InService |ELB=$RESULT”
    exit 1
    else
    echo “OK – ELB $ELB has ${RESULT} instances InService |ELB=$RESULT”
    exit 0
    fi

    Now when running
    bash -x ./check_elb.sh –l ELB-NAME –w 1 –c 2

    Returns
    + RESULT=2
    + outputDebug ‘Result of cmd is: 2’
    + ‘[‘ 1 -gt 0 ‘]’
    + echo -e ‘Result of cmd is: 2’
    Result of cmd is: 2
    + ‘[‘ 2 -gt 2 ‘]’
    + ‘[‘ 2 -eq 0 ‘]’
    + ‘[‘ -z 2 ‘]’
    + ‘[‘ 1 -gt 2 ‘]’
    + echo ‘OK – ELB ELB-ADMIN-INT has 2 instances InService |ELB=2’
    OK – ELB ELB-ADMIN-INT has 2 instances InService |ELB=2
    + exit 0

    Which is what I’m looking for.

    Thanks again!

    Joe.

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