Glenn's Wimpy Disclaimer
Usually I code in either Java, Groovy or Scala, however this was written in bash. There was one reason for this: No one else in my company can support any of the languages above easily.
And as a DevOp I thought this could be useful to others. With that being said please add comments on what it would take to make the script a little more professional.
What does it do?
In short this script should be launched daily by CRON and it will look for tagged volumes backup the volume based on the date associated with the tag.
Initializing the code
echo "starting volume backup"
#The interval between each backup
#The date the backups should removed.
EXPIRE_DATE=$(date -d "+$dayCount day" +%Y%m%d)
#The backup activate date. i.e. any volume with a date older than this will be backed up.
START_DATE=$(date -d "-$dayCount day" +%Y%m%d)
The code above is fairly simple initialize number of days between backups as well as establish the backup expire date and the date the volume should be backed up.
# get all the volumes and review each one searching for the backupdate tag
ec2-describe-volumes | while read line
#get volume id
volume=$(echo $line|cut -f3 -d' ')
#Get the backup key (if present)
key=$(echo $line|cut -f4 -d' ')
#get the backup date
value=$(echo $line|cut -f5 -d' ')
#if a backup tag is present for the volume check to see if its date signifies whether we should backup or not.
if [ "$key" == "backupdate" ]
# should we backup the volume
if [ $vart -lt 0 ]
echo "Backing up $volume"
echo "for date $value"
echo "new date $DATE"
#create the snapshot (backup) of the volume
snapresult=$(ec2-create-snapshot $volume -d \"backup$DATE\")
#get the snapshot Id
snapshot=$(echo $snapresult|cut -f2 -d' ')
#update the backupdate flag with the current date on the volume
ec2-create-tags $volume --tag backupdate="$CURRENT_DATE"
#tag snapshot with metadata with the information on when to remove the snapshot
ec2-create-tags $snapshot --tag backupdate="$EXPIRE_DATE"
ec2-create-tags $snapshot --tag Name=$EXPIRE_DATE
# if no more entries exit the loop
if [ -z "$line" ]
echo "Finished volume backup"
The comments in the code above should explain how volumes are acquired as well as how snapshots are created and tagged.
Once I finished the code above I added it to a CRON job that runs at 5:00 am every morning.
Hope this helps you out a little,