Create Automatic EBS snapshot - linux

Question

I was looking to setup automatic EBS snapshot at a particular time interval (let say once every week), for this I did Google and found that this task can be done using shell script and I found the same at this link.
Here is whole script, I am using :
#!/bin/bash
# Volume list file will have volume-id:Volume-name format
VOLUMES_LIST = /var/log/volumes-list
SNAPSHOT_INFO = /var/log/snapshot_info
DATE = `date +%Y-%m-%d`
REGION = "ap-south-1a"
# Snapshots Retention Period for each volume snapshot
RETENTION=6
SNAP_CREATION = /var/log/snap_creation
SNAP_DELETION = /var/log/snap_deletion
EMAIL_LIST = shishupal.shakya#itsmysun.com
echo "List of Snapshots Creation Status" > $SNAP_CREATION
echo "List of Snapshots Deletion Status" > $SNAP_DELETION
# Check whether the volumes list file is available or not?
if [ -f $VOLUMES_LIST ]; then
# Creating Snapshot for each volume using for loop
for VOL_INFO in `cat $VOLUMES_LIST`
do
# Getting the Volume ID and Volume Name into the Separate Variables.
VOL_ID = `echo $VOL_INFO | awk -F":" '{print $1}'`
VOL_NAME = `echo $VOL_INFO | awk -F":" '{print $2}'`
# Creating the Snapshot of the Volumes with Proper Description.
DESCRIPTION = "${VOL_NAME}_${DATE}"
/usr/local/bin/aws ec2 create-snapshot --volume-id $VOL_ID --description "$DESCRIPTION" --region $REGION &>> $SNAP_CREATION
done
else
echo "Volumes list file is not available : $VOLUMES_LIST Exiting." | mail -s "Snapshots Creation Status" $EMAIL_LIST
exit 1
fi
echo >> $SNAP_CREATION
echo >> $SNAP_CREATION
# Deleting the Snapshots which are 10 days old.
for VOL_INFO in `cat $VOLUMES_LIST`
do
# Getting the Volume ID and Volume Name into the Separate Variables.
VOL_ID = `echo $VOL_INFO | awk -F":" '{print $1}'`
VOL_NAME = `echo $VOL_INFO | awk -F":" '{print $2}'`
# Getting the Snapshot details of each volume.
/usr/local/bin/aws ec2 describe-snapshots --query Snapshots[*].[SnapshotId,VolumeId,Description,StartTime] --output text --filters "Name=status,Values=completed" "Name=volume-id,Values=$VOL_ID" | grep -v "CreateImage" > $SNAPSHOT_INFO
# Snapshots Retention Period Checking and if it crosses delete them.
while read SNAP_INFO
do
SNAP_ID=`echo $SNAP_INFO | awk '{print $1}'`
echo $SNAP_ID
SNAP_DATE=`echo $SNAP_INFO | awk '{print $4}' | awk -F"T" '{print $1}'`
echo $SNAP_DATE
# Getting the no.of days difference between a snapshot and present day.
RETENTION_DIFF = `echo $(($(($(date -d "$DATE" "+%s") - $(date -d "$SNAP_DATE" "+%s"))) / 86400))`
echo $RETENTION_DIFF
# Deleting the Snapshots which are older than the Retention Period
if [ $RETENTION -lt $RETENTION_DIFF ];
then
/usr/local/bin/aws ec2 delete-snapshot --snapshot-id $SNAP_ID --region $REGION --output text> /tmp/snap_del
echo DELETING $SNAP_INFO >> $SNAP_DELETION
fi
done < $SNAPSHOT_INFO
done
echo >> $SNAP_DELETION
# Merging the Snap Creation and Deletion Data
cat $SNAP_CREATION $SNAP_DELETION > /var/log/mail_report
# Sending the mail Update
cat /var/log/mail_report | mail -s "Volume Snapshots Status" $EMAIL_LIST
But when I ran it over terminal, it is showing me following errors.
Since I am new in this type of work so I am little uncomfortable in resolving this.
Please suggest the fix, I am on this since last few days.

Answer 1

There should not be spaces around the equals (=) signs.
FOO = 1
-bash: FOO: command not found
The correct syntax is:
FOO=1
Go through the script and remove all the spaces in the statements that assign values to variables.
But there is another error "expecting do" -- this makes me think the script is not being run with the correct shell. Instead of 'sh ec2.sh', try running it with bash explicitly: bash ec2.sh

Answer 2

It will be more easy to do it through AWS console.
In cloudwatch you create a new event rule. The event source is "scheduled". For the target you pick up "EC2 Createsnapshot API call". Enter the volume ID (you can find it in the ec2 instances console). Let AWS create a new role for this specific resource.
That's it !