Increase EC2 EBS Volume After Cloning - Resize2fs Not Working

This is a very similar problem to EC2 Can't resize volume after increasing size. However, I cannot resolve this manually using fdisk because I'm trying to get the whole process to

Solution 1:

Amazon Linux will automatically resize the root filesystem to the full size of the volume. This was introduced in Amazon Linux AMI 2014.03.

From the release notes:

Cloud-Init 0.7.2

Cloud-Init has been updated to the 0.7 series, adding a number of useful features. One example is dracut-modules-growroot, which automatically resizes your root filesystem on boot.