Purging ec2 snapshots using tags

Crontab entry

# Chef Name: osm_db_snapshot.sh
00 01 * * * /usr/local/sbin/osm_db_snapshot.sh

# Chef Name: ec2-purge-snapshots-osm-db
10 03 * * * /usr/local/sbin/ec2-purge-snapshots.rb -t env=prod -t contents=osm_db -h 48 -d 0 -w 0 -m 0 -a /root/.aws_access_key -e /root/.aws_secret_key

osm_db_snapshot.sh

#!/bin/sh
export JAVA_HOME=/usr/lib/jvm/java-6-sun
export EC2_HOME=/opt/ec2-api-tools

description="\"prod OSM Database backup at `date`\""

TMPFILE_JSON=$(mktemp /tmp/databagXXXXXXXXXX.json)

xfs_freeze -f /var/lib/postgresql/8.4/osm
snapshot_id=$(ec2-create-snapshot vol-118b9b7b -K /home/ubuntu/aws/pk-SnapshotUser.pem -C /home/ubuntu/aws/cert-SnapshotUser.pem -d "$description" | awk -F'\t' '{ printf "%s", $2 }')
xfs_freeze -u /var/lib/postgresql/8.4/osm

ec2-create-tags $snapshot_id --tag env=prod --tag contents=osm_db -K /home/ubuntu/aws/pk-SnapshotUser.pem -C /home/ubuntu/aws/cert-SnapshotUser.pem

cat <<END > $TMPFILE_JSON
{"id":"osm_db","snapshot-id": "$snapshot_id"}
END

knife data bag from file snapshots-prod $TMPFILE_JSON -c /etc/chef/client.rb

Backing up and purging old snapshots on Amazon EC2. See Amazon EC2: Purging Old Snapshots for details of why and how to use this.