create new snapshot and delete old snapshot

create_snapshot.sh

#!/bin/sh

##Setup
TODAY=`date +\%Y\%m\%d`
INSTANCE_NAME="set your instance name"
LOG="path to your log file"
EBS_VOLUME="set your ebs id"

EC2_REGION=ap-northeast-1
EBS_GENERATION=5
TRANS_ADDRESS="set your email address"

export export JAVA_HOME="set your java home"
export EC2_HOME="set your ec2-api-tools install dir"
export PATH=$PATH:$EC2_HOME/bin:$AWS_RDS_HOME/bin:$JAVA_HOME/bin
export EC2_CERT="set your ec2_cert path"
export EC2_PRIVATE_KEY="set your ec2_privatekey path"
export EC2_URL=https://ec2.ap-northeast-1.amazonaws.com

## start backup
echo  "start backup" > ${LOG}
echo  `date +\%Y\%m\%d` >> ${LOG}

##create snapshot
ec2-create-snapshot $EBS_VOLUME -d $INSTANCE_NAME-$TODAY
CREATE_CHECK=$?


##sleep
sleep 5m

##check snapshot
SNAPSHOTS=`ec2-describe-snapshots \
| grep -e $EBS_VOLUME | sort -k5 -r | awk '{print $2}'`
SNAP_CHECK=$?

##
COUNT=1
for SNAPSHOT in $SNAPSHOTS; do
        if [ $COUNT -le $EBS_GENERATION ]; then
                echo $SNAPSHOT "remained"
        else
                ec2-delete-snapshot \
                -K $EC2_PRIVATE_KEY \
                -C $EC2_CERT \
                --region $EC2_REGION \
                $SNAPSHOT
                echo $SNAPSHOT "deleted"
        fi
        COUNT=`expr $COUNT + 1`

done
DELETE_CHECK=$?

## Backup log
ec2-describe-snapshots |grep -e $EBS_VOLUME | sort -k5 -r  >> ${LOG}

## Backup Report
if [ ${CREATE_CHECK} = 0 -a ${SNAP_CHECK} = 0 -a ${DELETE_CHECK} = 0 ]
then
        echo "backup Succeeded" >> ${LOG}
        cat ${LOG} | mail -s "Backup Succeeded" ${TRANS_ADDRESS}
else
        echo "backup Failed" >> ${LOG}
        cat ${LOG} | mail -s "Backup Failed" ${TRANS_ADDRESS}
fi