EC2 Create Instance and Resize Filesystem

gistfile1.txt

#!/bin/bash

# Tester script to create an EC2 instance and resize the filesystem

function resizeit {
	echo "--------------------- RESIZING ---------------------"
	echo
	echo -e "\tPowering down the instance - $awsinstanceid"
	ec2-stop-instances $awsinstanceid > /dev/null 2>&1
	aws ec2 wait instance-stopped --instance-id $awsinstanceid
	echo -e "\t\tInstance is stopped"

	awsvolumeid=$(ec2-describe-volumes -F "attachment.instance-id=$awsinstanceid" | grep ATTACHMENT | awk '{print $2'})
	if [ -z $awsvolumeid ]; then
		"No volume is attached to the instance"
		exit 1
	fi

	echo -e "\tDetaching the volume - $awsvolumeid"
	ec2-detach-volume $awsvolumeid > /dev/null 2>&1
	echo -e "\t\tVolume is detached"

	echo -e "\tTake a snapshot of the instance disk"
	ec2-create-snapshot $awsvolumeid > /dev/null 2>&1

	awssnapshotid=$(ec2-describe-snapshots -F "volume-id=$awsvolumeid" | awk '{print $2'})

	aws ec2 wait snapshot-completed --snapshot-ids $awssnapshotid
	echo -e "\t\tSnapshot completed - $awssnapshotid"

	echo -e "\tCreate a new EBS volume from the snapshot with the specified size"
	newvolid=$(ec2-create-volume --snapshot $awssnapshotid --size $disk -z us-west-1a | grep VOLUME | awk '{print $2}')
	aws ec2 wait volume-available --volume-ids $newvolid

	echo -e "\tAttach the new volume to the instance - $newvolid"
	ec2-attach-volume $newvolid -i $awsinstanceid -d /dev/sda1 > /dev/null 2>&1
	if [ $? -eq 0 ]; then
		echo -e "\t\tVolume attached succesfully"
	else
		echo -e "\t\tSomething went wrong"
		exit 1
	fi

	echo -e "\tPower on the instance"
	ec2-start-instances $awsinstanceid > /dev/null 2>&1 
	aws ec2 wait instance-running --instance-ids $awsinstanceid
	echo -e "\t\tInstance is started"

	sleep 20 # Wait for SSH
	echo -e "\tResize partition"
	ssh root@$aws_ip "fdisk /dev/xvda << EEOF
		d
		n
		p
		1
		2

		w
		EEOF" >> /dev/null 2>&1
	ssh root@$aws_ip "shutdown -h 0"
	aws ec2 wait instance-stopped --instance-ids $awsinstanceid
	ec2-start-instances $awsinstanceid > /dev/null 2>&1 
	aws ec2 wait instance-running --instance-ids $awsinstanceid

	sleep 20 # Wait for SSH
	echo -e "\tResize filesystem"
	ssh root@$aws_ip "resize2fs -p /dev/xvda1"
	if [ $? -eq 0 ]; then
		echo -e "\tResize succesfully completed"
	else
		echo -e "\tResize failed"
		exit 1
	fi

	# Cleanup
	ec2-delete-snapshot $awssnapshotid
	ec2-delete-volume $awsvolumeid
}

function createvm {
	awsinstanceid=$(ec2-run-instances $ami -k $awsprivatekey -g $securitygroup --instance-type $instancetype -s $awssubnet --private-ip-address $aws_ip | grep INSTANCE | awk '{print $2}')
	if [ $? -eq 0 ]; then
		echo -e "\tSuccessfully created...waiting for the vm to come up"
		echo -e "\t\tHere's your instance ID: $awsinstanceid"
		ec2addtag $awsinstanceid --tag Name=$myhost > /dev/null 2>&1
		aws ec2 wait instance-running --instance-ids $awsinstanceid
		echo -e "\tServer is up and ready...Let's resize"
		echo
	else
		echo -e "\tFailed to create VM. Please check your configuration. Error code was $?"
	fi
}

awsprivatekey="mykey"
ami="ami-12345678"
securitygroup="sg-12345678"
instancetype="t2.micro"
awssubnet="subnet-12345678"
aws_ip="10.10.0.2"
myhost="test"
disk=20


createvm
resizeit