#!/bin/bash #Script Details #Script to create AMI of server on (based on cron timeperiod) and deleting AMI older than 3 days. #Time period can be controlled by the cron like Daily AMI Creation, every 3 days or weekly AMI Creation #The Retaining time for the AMI is 3days by default , however this can be customized on your requirement. #Deletion on AMI removes the associated snapshots #You need to pass the instance ID along as the arguments to the script #Credentials are fetched from the config file of the user #Uses the Sns configuration for sending the AMI Status #Instance Name is determined from the tag Name assigned to the instance #If Name tag is not found than script would exist with error message mail. #AMI Backup name would be having Instancename following by date in the YYYYMMDD format. #The backed up AMI would be having additional tags to identify the necessary information as follows #The instance ID from which this AutoAMI was created #The date tag on which this AutoAMI was created
instance_list=$1 DATE=`date +%Y%m%d` From="[email protected] " To="[email protected]" mail_body=/tmp/ami_report echo -e "----------------------------------\n `date` \n----------------------------------" > $mail_body for instance_id in ${instance_list//,/ }; do #Get the instance name from the instance id. instance_name=$(aws ec2 describe-instances --instance-ids $instance_id --query 'Reservations[].Instances[].[Tags[?Key==`Name`].Value[]]' --output text) if [[ $instance_name == "" ]] ; then echo -e "Instance-ID ($instance_id) scheduled for auto AMI creation doesn't exist. Please check." | /bin/mail -A ses -s "$instance_id scheduled for AMI doesn't exist" -r $From $To exit else #Create the AMI name. ami_name=$(echo "$instance_name-$DATE") #To create AMI from the instance ami_id=$(aws ec2 create-image --instance-id "$instance_id" --name "$ami_name" --description "Auto AMI from $instance_name ($instance_id)" --no-reboot --output text) #Tag the AMI. aws ec2 create-tags --resources $ami_id --tags Key=Instance_id,Value=$instance_id Key=Date,Value=$DATE if [[ $ami_id != "" ]];then echo -e "$ami_id ($ami_name) created successfully from $instance_name ($instance_id).\n" >> $mail_body else echo -e "AMI creation failed from $instance_name ($instance_id). Please check.\n" >> $mail_body fi #############Auto Delete 3 days old AMI.############# DATE_d=`date +%Y%m%d --date '3 days ago'` ami_name_d=$(echo "$instance_name-$DATE_d") #Find the AMI need to be Deregister. ami_id_d=$(aws ec2 describe-images --filters Name=name,Values=$ami_name_d Name=tag-key,Values=Instance_id Name=tag-value,Values=$instance_id --query 'Images[*].{ID:ImageId}' --output text) if [[ $ami_id_d != "" ]]; then #Find the snapshots attached to the AMI need to be Deregister. aws ec2 describe-images --image-ids $ami_id_d --query 'Images[].BlockDeviceMappings[].Ebs.SnapshotId' --output text > /tmp/snap.txt #Deregistering the AMI aws ec2 deregister-image --image-id $ami_id_d #Deleting snapshots attached to AMI for i in `cat /tmp/snap.txt`;do aws ec2 delete-snapshot --snapshot-id $i ; done echo -e "$ami_id_d deleted with attached snapshot `cat /tmp/snap.txt`\n" >> $mail_body fi fi done cat $mail_body | /bin/mail -A ses -s "Auto backup report `date +%d%b%y`" -r $From $To
Example
Add a crontab entry on the server having the AWS Access and Secret key installed# crontab -e
# Auto AMI creation & Deletion
# Every 3rd day at 10pm # Test-Server(i-ejhc4dfer45), Test-Server2(i-ejhc4dfer58)
0 22 */3 * * /opt/aws_automation/autoamibackup.sh i-ejhc4dfer45,i-ejhc4dfer58
