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You would need cloud-init and a way to grow the partition. It's different between ubuntu and centos so it depends on what type of linux volume you are deploying. If you are deploying windows then you need to sysprep and look at other ways to grow the instance volume.

https://launchpad.net/cloud-init

Your best bet would be to download one of the ubuntu + centos qcow2 images, upload them, launch them, then go through and see what settings they use by default in /etc/cloud.cfg. You can mimic what they are doing by using similar options in your cloud config file. You can also look at what packages are installed like growpart and cloud-init and others.