AWS ebs snapshots

gistfile1.txt

#!/bin/bash -e

# creating snapshot of jenkins instance

MOUNTPOINT=/u1
DEVICE="/dev/xvdf" # TODO discover
AWS_DEVICE="/dev/sdf"
LINEAGE="ci"
KEEP=10 # how many shapshots to keep

VOLUME_ID=$(aws ec2 describe-instances --instance-id `ec2metadata --instance-id`  --query "Reservations[].Instances[].BlockDeviceMappings[]" --output json | jq -r '.[] | if .DeviceName == "/dev/sdf" then .Ebs.VolumeId else empty end ')

xfs_freeze -f $MOUNTPOINT
SNAPSHOT_ID=$(aws ec2 create-snapshot --volume-id $VOLUME_ID | awk '{ print $3 }')
xfs_freeze -u $MOUNTPOINT

aws ec2 create-tags --resources $SNAPSHOT_ID --tags Key=Lineage,Value=$LINEAGE


# Purge
toEpoch () { while  read A; do  D=${A/snap-?????????}; ID=${A%%????????????????????????Z}; echo "$ID $(date -d $D +%s)"; done; }

OLD_SNAPSHOTS=$(aws ec2 describe-snapshots --filter Name=tag:Lineage,Values=ci --query "Snapshots[].[SnapshotId,StartTime]" | xargs -n2 | toEpoch | sort  -r -n -k 2 | tail -n +${KEEP} | awk '{ print $1 }')
echo "Purging old snapshots $OLD_SNAPSHOTS"


for s in $OLD_SNAPSHOTS; do 
	aws ec2 delete-snapshot --snapshot-id $s
done