EC2インスタンスのスナップショット作成スクリプト。

create_snaphost_own_instance.sh

#!/bin/sh
[ -z "$JAVA_HOME" ] && export JAVA_HOME=/usr/lib/jvm/jre
[ -z "$EC2_HOME" ]  && export EC2_HOME=/opt/aws/apitools/ec2
[ -z "$AWS_PATH" ]  && export AWS_PATH=/opt/aws && export PATH="${PATH}:${AWS_PATH}/bin"

AWS_REGION=`curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone | sed -e 's/[a-z]$//'`
INSTANCE_ID=`curl -s http://169.254.169.254/latest/meta-data/instance-id`
KERNEL_ID=`curl -s http://169.254.169.254/latest/meta-data/kernel-id`
OPTS="--aws-access-key ${AWS_ACCESS_KEY_ID} --aws-secret-key ${AWS_SECRET_ACCESS_KEY} --region ${AWS_REGION}"

INSTANCE_NAME=`ec2-describe-instances ${OPTS} | grep ${INSTANCE_ID} | grep TAG | grep Name | cut -f5`
EBS_VOLUME_ID=`ec2-describe-volumes ${OPTS} | grep ${INSTANCE_ID} | cut -f2`

SNAPSHOT_DESCRIPTION="Daily Backup for ${INSTANCE_NAME}(${KERNEL_ID})"
SNAPSHOT_GENERATION=7

ec2-create-snapshot ${OPTS} --description "${SNAPSHOT_DESCRIPTION}" ${EBS_VOLUME_ID}

SNAPSHOTS=`ec2-describe-snapshots ${OPTS} | grep ${EBS_VOLUME_ID} | grep "${SNAPSHOT_DESCRIPTION}" | sort -k5 -r | awk '{print $2}'`

COUNT=1
for SNAPSHOT in ${SNAPSHOTS}; do
  if [ ${COUNT} -gt ${SNAPSHOT_GENERATION} ]; then
    echo "deleting ${SNAPSHOT}";
    ec2-delete-snapshot ${OPTS} ${SNAPSHOT}
  fi
  COUNT=`expr ${COUNT} + 1`
done