Decrease Size of EBS Volume attached to EC2 Instance

DilLip_Chowdary

11/4/23, 6:13 AM

I've created an EC2 instance with some 100 GB initial size, thereafter I realized this much size is not required, I've to decrease the size now.

What I tried?

Create a new volume with the desired size.
Attach new volume to ec2 instance.
Setup New volume (grub-install, EFI partition, etc)
Copy data from old_volume to new_volume.
Detach old volume.

But this process is a little bit complex as this can't be smoothly done by all the users, is there any better approach for this?

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linux

amazon-ec2

amazon-ebs

amazon-web-services

Tim

11/4/23, 8:51 AM

The approach you've taken is the only one I know that works. How many volumes do you have that are too large?

DilLip_Chowdary

11/4/23, 11:15 AM

Added my new approach in the answer, (bypass EFI setup process)

Score:1

Server

DilLip_Chowdary

11/4/23, 11:11 AM

Here are the steps to migrate your ec2 instance data from large volume to small volume.

Create a new Instance with desired (reduced) volume size and name it temp-instance.
- After the instance is in a running state and status checks are passed, stop the instance, detach this volume and name it as destination_vol
Attach destination_vol to the main instance.
Connect to the main instance and run the below commands.
Login as root

sudo su -

Mount Volumes

mkdir /target

mount -t ext4 /dev/nvme1n1p1 /target

Copy data from src to dest

rsync -aHAXxSP / /target

Unmount Volumes.

umount /target

Stop Main Instance
Detach both volumes.
Attach destination_vol in mount path /dev/sda1
Start the instance.

Note:

Make sure you set proper AMI, architecture, vpc, etc while creating a temp instance.

Tips

Stuck in Initializing state:

If you followed all the above steps properly and still your instance is in the initializing state, you can shutdown and restart the instance.

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EN: Decrease Size of EBS Volume attached to EC2 Instance

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