Take snapshots of aws instance based on the name tag.

awsSnapshot.sh

#!/usr/bin/env sh
### aj@22seven.com
### script to snapshot aws instances based in instance name.
# Great big construct to remind me how it all works.
# Also happens to be a multiline self-documenting comment.
THIS=$(basename "$0" .sh)
DOCZ=$(cat <<-docz
		AWS Instance snapshotter.\n\n
		Usage: $THIS [-n | --name] {INSTANCE NAME}\n\n
		-n --name   The name of the instance to snapshot. Should be unique.\n
		-h --help   This text.\n\n
docz
)
if test "$#" -eq "0"; then
	printf "%b\n" "No options provided."
	echo $DOCZ; exit 1;
fi

function SNAPSHOT() {
	#Find and snapshot drives.
	printf "%b\n" "Quering aws for $INSTANCENAME details..."
	INSTANCEID=$(aws ec2 describe-instances --query "Reservations[].Instances[].[InstanceId, Tags[?Key=='Name'] | [0].Value]" --output text | awk "/$INSTANCENAME/ {print \$1}");
	printf "%b\n" "$INSTANCENAME InstanceId: $INSTANCEID"
	VOLUMES=$(aws ec2 describe-instances --instance-ids $INSTANCEID --query "Reservations[].Instances[].BlockDeviceMappings[].Ebs[].VolumeId" --output text);
	printf "%b\n" "Starting snapshot/s of $VOLUMES..."
	for VOLUME in $VOLUMES; do
		SNAPSHOT=$(aws ec2 create-snapshot --output text --volume-id "$VOLUME" --description "$INSTANCEID" | awk '{print $4}');
		printf "%b\n" "Snapshot ID: $SNAPSHOT"
	done
}

while (($#)); do
	case $1 in
		-n | --name) INSTANCENAME=$2 && (SNAPSHOT) ;;
		-h | --help) echo $DOCZ; exit 0;;
		*) echo $DOCZ; exit 1;;
	esac
	shift 2
done