investigate a growfs by default about centos-bootc HOT 7 CLOSED

#397 will help, but won't be on by default.

My inclination then is to close this by documenting the usage of a simple systemd unit that executes growpart on the root.

from centos-bootc.

Someone also floated the idea that we use LVM by default; if we do that it'd change things here; in some ways it'd be simpler. (There's also stratis, etc.)

from centos-bootc.

One thing is growpart doesn't grow the filesystem. Hmm, if we really wanted, we could probably lift ignition-ostree-growfs.sh out of f-c-c, clean it up, and share it somehow. Though it's begging to be rewritten in a proper language (if we do that, we could propose adding it to cloud-utils directly).

from centos-bootc.

There's a big difference here which is that code is designed to run in the initramfs, whereas traditionally cloud-init's growpart runs in the real root (though I bet it could run from the initramfs). And this gets into the fact that we don't ship the filesystem tools in the initramfs in this base image because it's designed to either be installed "dynamically" (e.g. bootc install/anaconda that make filesystems on the target system), or bib but that should be tuning the filesystem choices again based on input osbuild/bootc-image-builder#52

The rootfs growing is really for generic cloud images, and so...the more I think about it, the root problem here is really what bib is doing linked from that above issue.

Adding growpart just gives us that baseline tool as an out for a broken situation.

(Anyone can feel free to reopen if you disagree of course)

from centos-bootc.

We went back and forth on this and decided for now to try to add growpart to the base, but that dropped off the radar. It's...just very messy.

from centos-bootc.

What about have a systemd unit in the initrd that grows the boot the root partition (growpart) and the root filesystem (growfs) before it is mounted, so that it takes the whole install disk? This could be an optional setting controlled by a kernel argument.

from centos-bootc.

https://gitlab.com/fedora/bootc/base-images/-/merge_requests/9

from centos-bootc.