SettingUpAWSapi

Setting Up AWS api:  [ Amazon command line tools ] :

I am using ubuntu 12.10 and for the long time I was getting error while setting up AWS api in my system:

export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64/jre

export EC2_HOME=~/ec2

export EC2_PRIVATE_KEY=<Private_key_path>

export EC2_CERT=<Cert_path>

For other aws api:

export AWS_ELB_HOME=~/elb

export AWS_CLOUDWATCH_HOME=~/cw

PATH=$PATH:$JAVA_HOME/bin:$EC2_HOME/bin

Note:
You can create different scripts, where you specify different EC2_CERT and EC2_PRIVATE_KEY to access your different aws account, example [dev, qa or prod]

For other api call: 

http://aws.amazon.com/developertools/

For AMI CLI: 
http://awsiammedia.s3.amazonaws.com/public/tools/cli/latest/IAMCli.zip

For ElasticBeanstalk CLI:

https://s3.amazonaws.com/elasticbeanstalk/cli/AWS-ElasticBeanstalk-CLI-2.6.0.zip

For ELB CLI:

http://ec2-downloads.s3.amazonaws.com/ElasticLoadBalancing.zip

For AutoScalling CLI:

http://ec2-downloads.s3.amazonaws.com/AutoScaling-2011-01-01.zip

For S3 CLI:

http://code.google.com/p/lits3/downloads/detail?name=LitS3-Commander-0.8.4.zip

Even after above setting I was getting java related error... and I stared trying solving the same issue, checked some on-line links and found lots of people have similar issue. [ I was my mistake that I was keeping all the aws command in a same directory. ]

I removed all the jre and java related package from my ubuntu system and reinstall those pkg again but the similar issue.

The error was something like:

ec2-describe-regions

Error: Could not find or load main class com.amazon.aes.webservices.client.cmd.DescribeRegions

Then I started looking around the JAVA CLASSPATH... again spent some more time. But the good part that I understand that in hard way... after working for long hours. As a SRE/DEVOPS person, when started from Linux System Administrator, understanding java error took some time :)

Started looking the aws command code:

amitmund@amitmundlaptop:~/ec2/bin$ cat ../ec2-api-tools-1.6.0.0/bin/ec2-describe-regions

#!/usr/bin/env bash

# Copyright 2006-2010 Amazon.com, Inc. or its affiliates.  All Rights Reserved.  Licensed under the

# Amazon Software License (the "License").  You may not use this file except in compliance with the License. A copy of the

# License is located at http://aws.amazon.com/asl or in the "license" file accompanying this file.  This file is distributed on an "AS

# IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific

# language governing permissions and limitations under the License.

__ZIP_PREFIX__EC2_HOME="${EC2_HOME:?EC2_HOME is not set}"

__RPM_PREFIX__EC2_HOME=/usr/local/aes/cmdline

"${EC2_HOME}"/bin/ec2-cmd DescribeRegions "$@"

 And then followed the ec2-cmd:

amitmund@amitmundlaptop:~/ec2/bin$ cat ec2-cmd

#!/usr/bin/env bash

# Copyright 2006-2009 Amazon.com, Inc. or its affiliates.  All Rights Reserved.  Licensed under the

# Amazon Software License (the "License").  You may not use this file except in compliance with the License. A copy of the

# License is located at http://aws.amazon.com/asl or in the "license" file accompanying this file.  This file is distributed on an "AS

# IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific

# language governing permissions and limitations under the License.

# This script "concentrates" all of our Java invocations into a single location

# for maintainability.

# 'Globals'

__ZIP_PREFIX__EC2_HOME="${EC2_HOME:-EC2_HOME is not set}"

__RPM_PREFIX__EC2_HOME=/usr/local/aes/cmdline

LIBDIR="${EC2_HOME}/lib"

# Check our Java env

JAVA_HOME=${JAVA_HOME:?JAVA_HOME is not set}

# If a classpath exists preserve it

CP="${CLASSPATH}"

# Check for cygwin bash so we use the correct path separator

case "`uname`" in

    CYGWIN*) cygwin=true;;

esac

# ---- Start of Cygwin test ----

cygprop=""

# And add our own libraries too

if [ "${cygwin}" == "true" ] ; then

    cygprop="-Dec2.cygwin=true"

    # Make sure that when using Cygwin we use Unix

    # Semantics for EC2_HOME

    if [ -n "${EC2_HOME}" ]

    then

        if echo "${EC2_HOME}"|egrep -q '[[:alpha:]]:\\'

        then

            echo

            echo " *INFO* Your EC2_HOME variable needs to specified as a Unix path under Cygwin"

            echo

        fi

    fi

# ---- End of Cygwin Tests ----

    for jar in "${LIBDIR}"/*.jar ; do

        cygjar=$(cygpath -w -a "${jar}")

        CP="${CP};${cygjar}"

    done

else

    for jar in "${LIBDIR}"/*.jar ; do

        CP="${CP}:${jar}"

    done

fi

CMD=$1

shift

"${JAVA_HOME}/bin/java" ${EC2_JVM_ARGS} ${cygprop} -classpath "${CP}" "com.amazon.aes.webservices.client.cmd.${CMD}" $EC2_DEFAULT_ARGS "$@"

 then I found it is looking for classpath and the jar files from the same directory's lib folder from were I have copied the aws commands.

 Later I created a "lib" directory in the same location where I created the "bin" directory for all the aws command line tools and started coping the "jar" files from all the original directory to this "lib" directory and its started working. :)

so.... where I was doing mistake?

I have downloaded all the aip from Amazon site... and it around few different zip files from windows and linux environment...

e.g:

AutoScaling-2010-08-01.zip

CloudWatch-2010-08-01.zip

ec2-api-tools.zip  RDSCli.zip

AWSCloudFormation-cli.zip 

ec2-ami-tools.zip        

IAMCli.zip

But what I did, to set the a single EC2_HOME directory, I extracted all these directory and copied all the aws command from those directories "bin" directory and copied them to ~/ec2/bin and not the related "lib" directory where all the related jar files were there.  Because of that I was getting the following error:

Error: Could not find or load main class com.amazon.aes.webservices.client.cmd.DescribeRegions