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# Resize an Amazon EBS volume that an environment uses
<a name="move-environment-resize"></a>

This step shows how you can resize an Amazon EBS volume.

1. Open the environment that's associated with the Amazon EC2 instance for the Amazon EBS volume that you want to resize.

1. In the AWS Cloud9 IDE for the environment, create a file with the following contents, and then save the file with the extension `.sh` (for example, `resize.sh`).
**Note**  
This script works for Amazon EBS volumes that are connected to EC2 instances that run AL2023, Amazon Linux 2, Amazon Linux, or Ubuntu Server and is configured to use IMDSv2.  
The script also resizes Amazon EBS volumes exposed as NVMe block devices on Nitro-based instances. For a list of instances based on the Nitro system, see [Nitro-based instances](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-types.html#ec2-nitro-instances) in the *Amazon EC2 User Guide*.

   ```
   #!/bin/bash
   
   # Specify the desired volume size in GiB as a command line argument. If not specified, default to 20 GiB.
   SIZE=${1:-20}
   
   # Get the ID of the environment host Amazon EC2 instance.
   TOKEN=$(curl -s -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 60")
   INSTANCEID=$(curl -s -H "X-aws-ec2-metadata-token: $TOKEN" -v http://169.254.169.254/latest/meta-data/instance-id 2> /dev/null)
   REGION=$(curl -s -H "X-aws-ec2-metadata-token: $TOKEN" -v http://169.254.169.254/latest/meta-data/placement/region 2> /dev/null)
   
   # Get the ID of the Amazon EBS volume associated with the instance.
   VOLUMEID=$(aws ec2 describe-instances \
     --instance-id $INSTANCEID \
     --query "Reservations[0].Instances[0].BlockDeviceMappings[0].Ebs.VolumeId" \
     --output text \
     --region $REGION)
   
   # Resize the EBS volume.
   aws ec2 modify-volume --volume-id $VOLUMEID --size $SIZE
   
   # Wait for the resize to finish.
   while [ \
     "$(aws ec2 describe-volumes-modifications \
       --volume-id $VOLUMEID \
       --filters Name=modification-state,Values="optimizing","completed" \
       --query "length(VolumesModifications)"\
       --output text)" != "1" ]; do
   sleep 1
   done
   
   # Check if we're on an NVMe filesystem
   if [[ -e "/dev/xvda" && $(readlink -f /dev/xvda) = "/dev/xvda" ]]
   then
   # Rewrite the partition table so that the partition takes up all the space that it can.
     sudo growpart /dev/xvda 1
   # Expand the size of the file system.
   # Check if we're on AL2 or AL2023
     STR=$(cat /etc/os-release)
     SUBAL2="VERSION_ID=\"2\""
     SUBAL2023="VERSION_ID=\"2023\""
     if [[ "$STR" == *"$SUBAL2"* || "$STR" == *"$SUBAL2023"* ]]
     then
       sudo xfs_growfs -d /
     else
       sudo resize2fs /dev/xvda1
     fi
   
   else
   # Rewrite the partition table so that the partition takes up all the space that it can.
     sudo growpart /dev/nvme0n1 1
   
   # Expand the size of the file system.
   # Check if we're on AL2 or AL2023
     STR=$(cat /etc/os-release)
     SUBAL2="VERSION_ID=\"2\""
     SUBAL2023="VERSION_ID=\"2023\""
     if [[ "$STR" == *"$SUBAL2"* || "$STR" == *"$SUBAL2023"* ]]
     then
       sudo xfs_growfs -d /
     else
       sudo resize2fs /dev/nvme0n1p1
     fi
   fi
   ```

1. From a terminal session in the IDE, switch to the directory that contains the `resize.sh` file. Then run either of the following commands, replacing `20` with the size in GiB that you want to resize the Amazon EBS volume to:
   + 

     ```
     bash resize.sh 20
     ```
   + 

     ```
     chmod +x resize.sh
     ./resize.sh 20
     ```