ec2 root volume resize

ec2-root-resize.sh

#!/bin/bash -e

if [ $# -ne 2 ]; then
    echo "Usage: $0 <instance-id> <volume-size-gb> [PARITION_NAME=/dev/xvda2]"
    exit 2
fi

INSTANCE="$1"
VOLUME_SIZE="$2"
PARTITION="${3:-/dev/xvda2}"
PARTITION_NUMBER=$(echo $PARTITION | tail -c2)
DISK_NAME=$(echo $PARTITION | sed 's/'$PARTITION_NUMBER'//')

# Retrieve all needed information
instance_data=$(aws ec2 describe-instances --instance-ids $INSTANCE)
root_volume=$(echo $instance_data | jq -r '.Reservations[0].Instances[0].BlockDeviceMappings[0].Ebs.VolumeId')
instance_ip=$(echo $instance_data | jq -r '.Reservations[0].Instances[0].NetworkInterfaces[0].PrivateIpAddress')

# Modify volume
aws ec2 modify-volume --volume-id $root_volume --size $VOLUME_SIZE
sleep 5

# Update root partition
ssh $instance_ip "sudo growpart $DISK_NAME $PARTITION_NUMBER"
ssh $instance_ip "sudo resize2fs $PARTITION"