AWS Snapshot

snapshot.sh

#!/bin/bash

# error handling
 error_handler() {
	   echo "Error occurred in script at line: ${1}"
	     echo "Line exited with status: ${2}"
     }

     trap 'error_handler ${LINENO} $?' ERR

     set -o errexit
     set -o errtrace
     set -o nounset

# check for dependencies
jq_check () {
# check Linux package manager (yum or apt)
if ! type "jq" > /dev/null 2>&1; then
	if type "yum" > /dev/null 2>&1; then
		sudo yum install -y jq
           else
		sudo apt install -y jq
        fi
fi
}
jq_check

# set variables
SOURCE_REGION="eu-central-1"
DESTINATION_REGION="eu-west-1"
TIMESTAMP=$(date +%F-%a) # year-month-date-day format
VOL="vol-086f83557928e0540" # Volume to backup
ORIG_SNAPSHOT="$TIMESTAMP-$VOL.json"

# How many days do you wish to retain backups for? Default: 7 days
RETENTION_DAYS="7"
RETENTION_DATE_IN_SECONDS=$(date +%s --date "$RETENTION_DAYS days ago")

# create snapshot of attached EBS and get SnapShotId
aws --region "$SOURCE_REGION" ec2 create-snapshot --volume-id "$VOL" --description "$TIMESTAMP Jenkins Docker home temporary snapshot" > "$ORIG_SNAPSHOT"
ORIG_ID=$(jq -r '.SnapshotId' "$ORIG_SNAPSHOT")
COPY_SNAPSHOT="$TIMESTAMP-$ORIG_ID.json"

# check snapshot status
ORIG_PROGRESS=$(aws --region "$SOURCE_REGION" ec2 describe-snapshots --snapshot-id "$ORIG_ID" | jq -r '.Snapshots[].Progress')
while [[ "$ORIG_PROGRESS" != "100%" ]]; do
	sleep 20
         ORIG_PROGRESS=$(aws --region "$SOURCE_REGION" ec2 describe-snapshots --snapshot-id "$ORIG_ID" | jq -r '.Snapshots[].Progress')
done

# copy snapshot to another region for fault tolerance
aws --region "$DESTINATION_REGION" ec2 copy-snapshot --source-region "$SOURCE_REGION" --source-snapshot-id "$ORIG_ID" --description "$TIMESTAMP Jenkins Docker home directories" > "$COPY_SNAPSHOT"
COPY_ID=$(jq -r '.SnapshotId' "$COPY_SNAPSHOT")

# check snapshot copy status
COPY_PROGRESS=$(aws --region "$DESTINATION_REGION" ec2 describe-snapshots --snapshot-id "$COPY_ID" | jq -r '.Snapshots[].Progress')
while [[ "$COPY_PROGRESS" != "100%" ]]; do
	sleep 60
         COPY_PROGRESS=$(aws --region "$DESTINATION_REGION" ec2 describe-snapshots --snapshot-id "$COPY_ID" | jq -r '.Snapshots[].Progress')
done

# Add a "CreatedBy:AutomatedJenkinsBackup" tag to the resulting snapshot.
aws ec2 create-tags --region "$DESTINATION_REGION" --resource "$COPY_ID" --tags Key=CreatedBy,Value=AutomatedJenkinsBackup

# cleanup
aws --region "$SOURCE_REGION" ec2 delete-snapshot --snapshot-id "$ORIG_ID"
rm -rf "$ORIG_SNAPSHOT" "$COPY_SNAPSHOT"

# Check age of snapshot
SNAPSHOT_DATE=$(aws ec2 describe-snapshots --region eu-west-1 --output=text --snapshot-ids "$COPY_ID" --query Snapshots[].StartTime | awk -F "T" '{printf "%s\n", $1}')
SNAPSHOT_DATE_IN_SECONDS=$(date "--date=$SNAPSHOT_DATE" +%s)

if (( SNAPSHOT_DATE_IN_SECONDS <= RETENTION_DATE_IN_SECONDS )); then
     aws ec2 delete-snapshot --region "$DESTINATION_REGION" --snapshot-id "$COPY_ID"
fi