How do I extend my Linux file system after increasing my EBS volume on my EC2 instance?
Last updated: 2020-05-05
I increased the size of my Amazon Elastic Block Store (Amazon EBS) volume, but my file systems aren't using the full volume. How do I fix that?
When a volume is expanded to a larger size, the file system must also be resized to take advantage of the larger volume size. You can resize a file system as soon as it's in the optimizing state.
The following procedure extends an 8 GB ext4 file system to get full use of a 16 GB volume. The file system is on an Amazon Elastic Compute Cloud (Amazon EC2) instance running Ubuntu.
1. Create a snapshot of your volume before changing your volume or file system. For more information, see Creating Amazon EBS Snapshots.
2. Use the df -h command to show the size and the percentage used by the file system.
ubuntu@ip-172-31-32-114:~$ df -h Filesystem Size Used Avail Use% Mounted on /dev/xvda1 7.7G 7.7G 0 100% / /dev/xvdf 7.9G 7.1G 370M 96% /home/ubuntu/test
In this example, the /dev/xvdf/ file system size is 7.9G and is 96% full.
3. Use the lsblk command to show the size of the xvdf volume.
ubuntu@ip-172-31-32-114:~$ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT xvda 202:0 0 8G 0 disk └─xvda1 202:1 0 8G 0 part / xvdf 202:80 0 16G 0 disk /home/ubuntu/test
In this example, the size of the xvdf volume is 16G.
4. Connect to your instance using SSH. For more information, see Connect to your Linux instance.
5. If the volume has a partition containing a file system, that partition must be resized before the file system is expanded.
6. Use the resize2fs command to automatically extend the size of the /dev/xvdf/ file system to the full space on the volume.
ubuntu@ip-172-31-32-114:~$ sudo resize2fs /dev/xvdf
Note: In this example, the volume is using an ext4 file system. Depending on your file system, you might need to use a different utility. For more information, see Extending the file system.
7. Rerun the df –h command.
ubuntu@ip-172-31-32-114:~$ df -h Filesystem Size Used Avail Use% Mounted on /dev/xvda1 7.7G 7.7G 0 100% / /dev/xvdf 16G 7.1G 8.0G 48% /home/ubuntu/test
The /dev/xvdf/ file system is now 16G in size and only 48% full.