Editing How-make-automatic-snapshots-using-google-compute-engine




'''Referance Articles''' : http://www.smiss.com.ua/blog/how-make-automatic-snapshots-using-google-compute-engine
and https://cloud.google.com/compute/docs/gcutil/

'''Objective''' : how-make-automatic-snapshots-using-google-compute-engine

Snapshots are used for Backup purpose . This document talks about how to create automatic backups i.e Snapshot Backup 


= Process =
 

login to the google cloud compute engine and look for "gcutil"  via locate command 

If Not available then Install gcutil as below 


== Install gcutil ==


To install gcutil:

'''Download''' gcutil-1.16.1.tar.gz file.

 wget https://dl.google.com/dl/cloudsdk/release/artifacts/gcutil-1.16.1.tar.gz

'''Extract''' the files.

Run the following command to extract the tar file. This unpacks a directory named gcutil-1.16.1 in /usr/local/share.

 sudo tar xzvpf gcutil-1.16.1.tar.gz -C /usr/local/share

Create a symbolic link to the gcutil binary.

 sudo ln -sf /usr/local/share/gcutil-1.16.1/gcutil /usr/local/bin/gcutil

Start using gcutil.

If you modified your system path, restart your shell before continuing so the changes can take effect. To see a list of available gcutil commands, run:

 $ gcutil help

For additional information on authenticating with the Cloud SDK, such as if you are working in a terminal session on another machine, see the following section.

'''Authenticate gcutil'''

To authenticate gcutil, follow the instructions for gcloud compute.

Then, test out the tool by running:

 $ gcutil listinstances

Once gcutil has been installed please proceed with the script now 


= Automated Backup Script =


Create a script as /root/scripts/gsnapshots.sh ( make sure you do make it executable ) the Script is below . The parameter to be looked upon are 

'''Mailboxes''' - email address to which alert mail should go

'''GCUTILPATH''' - the path of gcutils

'''project''' - this is google project name , it has to be go from Mr Banerjee
 
'''list''' - List of disk which need to be backup , run the command 

 gcutil --project="aimil-zimbra" listdisks --format=csv
 name,zone,status,size-gb
 disk-1,asia-east1-a,READY,500
 instance-1,asia-east1-a,READY,20

so there are 2 disk , disk-1 and instance-1 

'''days''' - No of days for rotation of snapshot backups 

The script /root/scripts/gsnapshots.sh as follows 

 #!/bin/bash
 # Google cloud snapshots script.
 #list of mailboxes
 mailboxes="biswajit@tetrain.com"
 mailtext=/tmp/mailtext$$
 # GCUTILPATH
 GCUTILPATH=/usr/local/bin/
 # Project name
 project=aimil-zimbra
 # What need to backup, list - disks from list, all - all disks.
 backup="all"
 #List of persistent disks
 list="disk-1 instance-1"
 # Rotation, how many days  to keep
 days=30
 ##############################################################################
 log()
 {
 	echo `date +%y/%m/%d_%H:%M:%S`:: $* >> $mailtext
 	echo `date +%y/%m/%d_%H:%M:%S`:: $*
 }
 case $backup in
            	"all" )
            	disklist=`${GCUTILPATH}gcutil --project="$project" listdisks --format=csv | tail -n +2 | cut -d ',' -f1`
            	;;
            	"list")
            	disklist=$list
            	;;
            	*)
            	log "Nothing to backup"
            	exit 0
            	;;
 esac
 function test {
        "$@"
 	local status=$?
        if [ $status -ne 0 ]; then
    	echo "error with $1"
    	mail -s "GOOGLE snapshot backup, ERROR. "  $mailboxes < $mailtext
    	exit $status
 	fi
 	return $status
 }
 for i in $disklist
 do
 log "Starting snapshot for $i"
 test ${GCUTILPATH}gcutil --service_version="v1"  --project="$project" addsnapshot "$i""-`date +%y%m%d`" --source_disk="$i"
 log "Snapshot for $i finished"
 done
 #Rotation
 for i in $disklist
 do
 snapshot="$i""-`date +%y%m%d -d "$days day ago"`"
 exist=`${GCUTILPATH}gcutil --project="$project" listsnapshots --format=csv | grep $snapshot`
    	if [ -z $exist ];then
    	log "Warning, snapshot $snapshot was not found"
    	else
    	log "Starting rotation for $i"
    	test ${GCUTILPATH}gcutil --project="$project" deletesnapshot -f $snapshot
    	log "Rotation for $i finished"
    	fi
 done
 log "All done."
 test rm $mailtext


== Cron Script ==

 50 0 * * * /bin/sync #clear disk buffers before snapshot
 0 1 * * * /root/scripts/gsnapshots.sh >> /var/log/gsnapshots.log #google snapshot script

==Testing ==

Please run the script and see the result .

Also check at google console login it should have mad the snapshot as shown below 

[[image:Snapshot-google.png]]