How to Resize a Disk from AWS CentoOS Image

Then create a new AMI. On boot, the cloud-init "growpart" module will grow the root partition to the total EBS size. Clearly, if that's not what you what, change or ignore that advice.

You can also fix this manually with a repartition and a reboot, but this will not automatically work as a new image.

# fdisk /dev/xvda <<END

u

d

n

p

1

2048

w

END

# reboot

# (after reboot)

# resize2fs /dev/xvda1

# df -h / # should now be entire EBS volume