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Resizing & Extending EC2 root partition - live

The EC2 standard EBS is 8G. Planning a simple single EBS instance, the EBS will also contain / and root partition.

Following the steps in http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/recognize-expanded-volume-linux.html, we can expand the EBS without stopping the instance.

The key steps:

1) Login to AWS Console, locate the EBS and modify the volume size - there is no need to stop the instance (if you are using the current generation of EC2 and EBS - as of Oct, 2017)

2) SSH to the EC2

3) Run lsblk - you will see xvda / xvda1 with different sizes, meaning you need to resize the partition before you can expand the volume

4) Resize the partition - growpart /dev/xvda 1  (note the space between xvda and 1)

5) The resize the filesystem - resize2fs /dev/xvda1

There are other posts saying stopping the instance, and use parted and gdisk.

In our case, it is not necessary.

There are disadvantages of a using single EBS scenario, but the beauty is that OS/APP/DB can be detached and mount on another EC2 quickly with just a few AWS Console manipulation.

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