AWS で、稼働中のインスタンスで自身のEBSボリュームのスナップショットを作るためのシェルスクリプト

create_snapshot.sh

#!/bin/sh
export JAVA_HOME="/usr/lib/jvm/jre"
export EC2_HOME="/usr/local/bin/ec2-api-tools"
export EC2_PRIVATE_KEY="~/ec2keys/pk-****.pem"
export EC2_CERT="~/ec2keys/cert-****.pem"

EC2_CMD="${EC2_HOME}/bin"

LOG_FILE="/var/log/create_snapshot.log"
LOG_SAVE_PERIOD=14

SNAPSHOTS_PERIOD=2

CREATE_MSG="Create Snapshot "

INSTANCE_ID=`curl -s http://169.254.169.254/latest/meta-data/instance-id`
REGION=ap-northeast-1

print_msg() {
  echo "`date '+%Y/%m/%d %H:%M:%S'` $1" | tee -a ${LOG_FILE}
}

print_msg "INF: START"

# log rotate
print_msg "INF: log rotate Start"
(( cnt=${LOG_SAVE_PERIOD} ))
while (( cnt > 0 ))
do
  logfile1=${LOG_FILE}.$cnt
  (( cnt=cnt-1 ))
  logfile2=${LOG_FILE}.$cnt
  if [ -f $logfile2 ]; then
    mv $logfile2 $logfile1
  fi
done
if [ -f $LOG_FILE ]; then
  mv ${LOG_FILE} ${LOG_FILE}.1
fi
touch $LOG_FILE
print_msg "INF: log rotate End"


# create snapshot
print_msg "INF: Create snapshot Start"
VOL_ID=`${EC2_CMD}/ec2-describe-instances --region=${REGION} ${INSTANCE_ID} | awk 'NR==3 {print $3}'`
if [ -z ${VOL_ID} ] ; then
  print_msg "ERR: ec2-describe-instances"
  logger -f ${LOG_FILE}
  exit 1
fi
print_msg "INF: ec2-describe-instances Success : ${VOL_ID}"

${EC2_CMD}/ec2-create-snapshot --region=${REGION} -d "Created by ${CREATE_MSG}(${INSTANCE_ID}) from ${VOL_ID}" ${VOL_ID} >> ${LOG_FILE} 2>&1
if [ $? != 0 ] ; then
  print_msg "ERR: ec2-create-snapshot"
  logger -f ${LOG_FILE}
  exit 1
fi
print_msg "INF: Create snapshot End"


# delete old snapshot
print_msg "INF: Delete old snapshot Start"
SNAPSHOTS=`${EC2_CMD}/ec2-describe-snapshots --region=${REGION} | grep ${VOL_ID} | grep "Created by ${CREATE_MSG}" | wc -l`
while [ ${SNAPSHOTS} -gt ${SNAPSHOTS_PERIOD} ]
do
  SNAPSHOT=`${EC2_CMD}/ec2-describe-snapshots --region=${REGION} | grep ${VOL_ID} | grep "Created by ${CREATE_MSG}" | sort -k 5,5 -r | awk 'NR==3 {print $2}'`
  ${EC2_CMD}/ec2-delete-snapshot --region=${REGION} ${SNAPSHOT} >> ${LOG_FILE} 2>&1
  if [ $? != 0 ] ; then
    print_msg "ERR: ec2-delete-snapshot"
    logger -f ${LOG_FILE}
    exit 1
  fi
  SNAPSHOTS=`${EC2_CMD}/ec2-describe-snapshots --region=${REGION} | grep ${VOL_ID} | grep "Created by ${CREATE_MSG}" | wc -l`
done
print_msg "INF: Delete old snapshot End"

print_msg "INF: END"

exit 0