Edited at

Cronから実行するEC2スナップショットスクリプト

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実行条件


  • awscliがインストールされている

  • IAMロールなどでEC2周りの権限を解放しておく


スクリプト

#!/bin/sh

# 取得したいインスタンスのidを並べる
INSTANCE_ID=(i-xxxxx1 i-xxxxx2 i-xxxxx3)

SHELLDIR=`dirname ${0}`
SHELLDIR=`cd ${SHELLDIR}; pwd`
SHELLNAME=`basename $0`

LOG_DIR="/var/log"
LOG_SAVE_PERIOD=14
LOG_FILE="${LOG_DIR}/${SHELLNAME}.log"
echo $LOG_FILE

REGION=ca-central-1
SNAPSHOTS_PERIOD=2

AWS="/usr/bin/aws --region ${REGION}"

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

create_snapshot() {
for ID in `echo $@`
do
print_msg "Create snapshot Start"
VOL_ID=`${AWS} ec2 describe-instances --instance-ids ${ID} --output text | grep EBS | awk '{print $5}'`
if [ -z ${VOL_ID} ] ; then
echo ${VOL_ID}
print_msg "ERR:ec2-describe-instances"
logger -f ${LOG_FILE}
exit 1
fi
print_msg "ec2-describe-instances Success : ${VOL_ID}"
${AWS} ec2 create-snapshot --volume-id ${VOL_ID} --description "Created by SYSTEMBK(${ID}) from ${VOL_ID}" >> ${LOG_FILE} 2>&1
if [ $? != 0 ] ; then
print_msg "ERR:${SHELLDIR}/${SHELLNAME} ec2-create-snapshot"
logger -f ${LOG_FILE}
exit 1
fi
print_msg "Create snapshot End"
done
}

delete_old_snapshot() {
for ID in `echo $@`
do
VOL_ID=`${AWS} ec2 describe-instances --instance-ids ${ID} --output text | grep EBS | awk '{print $5}'`
print_msg "Delete old snapshot Start"
SNAPSHOTS=`${AWS} ec2 describe-snapshots --output text | grep ${VOL_ID} | grep "Created by SYSTEMBK" | wc -l`
while [ ${SNAPSHOTS} -gt ${SNAPSHOTS_PERIOD} ]
do
${AWS} ec2 delete-snapshot --snapshot-id `${AWS} ec2 describe-snapshots --output text | grep ${VOL_ID} | grep "Created by SYSTEMBK" | sort -k 11,11 | awk 'NR==1 {print $10}'` >> ${LOG_FILE} 2>&1
if [ $? != 0 ] ; then
print_msg "ERR:${SHELLDIR}/${SHELLNAME} ec2-delete-snapshot"
logger -f ${LOG_FILE}
exit 1
fi
SNAPSHOTS=`${AWS} ec2 describe-snapshots | grep ${VOL_ID} | grep "Created by SYSTEMBK" | wc -l`
done
print_msg "Delete old snapshot End"
done
}

rotate_log

print_msg "INF:$SHELLDIR/${SHELLNAME} START"
create_snapshot ${INSTANCE_ID[@]}
delete_old_snapshot ${INSTANCE_ID[@]}
print_msg "INF:$SHELLDIR/${SHELLNAME} END"

exit 0