Resizing Ubuntu 20.04 partition on AWS
If you resized an EBS volume attached to your EC2 instance on AWS you may have noticed it’s not immediately visible by Ubuntu. In order to be able to use the newly assigned disk space, the parition on that volume needs to be extended first.
Start by connecting to your server over SSH and listing all partitions which Ubuntu can see. You can do this by running the following command in the terminal:
You may see output like this:
Filesystem Size Used Avail Use% Mounted on udev 2.0G 0 2.0G 0% /dev tmpfs 395M 952K 394M 1% /run /dev/xvda1 78G 23G 55G 30% / tmpfs 2.0G 8.0K 2.0G 1% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup /dev/loop0 18M 18M 0 100% /snap/amazon-ssm-agent/1566 /dev/loop1 18M 18M 0 100% /snap/amazon-ssm-agent/1480 /dev/loop4 94M 94M 0 100% /snap/core/9066 /dev/loop3 98M 98M 0 100% /snap/core/9289 tmpfs 395M 0 395M 0% /run/user/1001
In this case, the volume is mounted under
You can also view the list of block devices:
Ubuntu has a handy tool called
growpart that can automatically extend a partition in a partition table to fill available space. Let’s run it:
growpart /dev/xvda 1
As you can see it takes two arguments - the first one is the device or disk to operate on and the second one is the number of partition to resize. (important note here, the first partition has number 1, not 0 which you may have expected)
Next, extend the file system using
resize2fs command. It works with ext2/ext3/ext4 file systems.
That’s it, Ubuntu should now see all available space on the resized volume. Make sure by running
lsblk df -h