The right way to Resize an AWS EBS Quantity in Bash

If it’s essential to resize an EBS quantity in AWS, you are able to do so utilizing bash.

Step 1 – Create a bash file

Create a bash file known as resize.sh:

#!/bin/bash

SIZE=${1:-20}

INSTANCEID=$(curl http://169.254.169.254/newest/meta-data/instance-id)
REGION=$(curl -s http://169.254.169.254/newest/meta-data/placement/availability-zone | sed 's/(.*)[a-z]/1/')

VOLUMEID=$(aws ec2 describe-instances 
  --instance-id $INSTANCEID 
  --query "Reservations[0].Cases[0].BlockDeviceMappings[0].Ebs.VolumeId" 
  --output textual content 
  --region $REGION)

aws ec2 modify-volume --volume-id $VOLUMEID --size $SIZE

whereas [ 
  "$(aws ec2 describe-volumes-modifications 
    --volume-id $VOLUMEID 
    --filters Name=modification-state,Values="optimizing","completed" 
    --query "length(VolumesModifications)"
    --output text)" != "1" ]; do
sleep 1
accomplished

if [[ -e "/dev/xvda" && $(readlink -f /dev/xvda) = "/dev/xvda" ]]
then
  sudo growpart /dev/xvda 1

  STR=$(cat /and so on/os-release)
  SUB="VERSION_ID="2""
  if [[ "$STR" == *"$SUB"* ]]
  then
    sudo xfs_growfs -d /
  else
    sudo resize2fs /dev/xvda1
  fi

else
  sudo growpart /dev/nvme0n1 1

  STR=$(cat /and so on/os-release)
  SUB="VERSION_ID="2""
  if [[ "$STR" == *"$SUB"* ]]
  then
    sudo xfs_growfs -d /
  else
    sudo resize2fs /dev/nvme0n1p1
  fi
fi

Step 2 – Run the bash file specifying the brand new measurement

Now that you’ve got the bash file, you possibly can run the bash file together with specifying the brand new measurement of the specified quantity:

bash resize.sh 50

The above command will try and resize the EBS quantity to 50GB.

Further Enhancements

In its place execution technique, it’s also possible to change the bash file to be executable. This can assist you to name it immediately with out having to go bash to the previous command.

First it’s essential to make the script and executable:

chmod +x resize.sh

Now you possibly can merely run the file with the parameters required:

./resize.sh 20

That is attainable as a result of the primary line of the file specifies the hashbang required to execute the code:

#!/bin/bash