dustymabe added a new comment to an issue you are following:
>I would like to also point out that one other benefit would be to prevent containers
from cannibalizing your root partition.
Not possible by making /var a separate file system, you'd have to use quotas. Ostree
owns /var, it must be a directory on rootfs at present.
and `overlayfs` using that then all of `/var/lib/docker` would be taken care of. Please
let me know if I'm wrong.
> I prefer overlay2 and would like to see there be only one option
so that we can have less confusion in the future. However, giving users the choice is nice
as well. Maybe there is a way to achieve both on startup.
You could have two kickstarts: overlay2 and devicemapper, and each kickstart is specified
using a GRUB menu entry on the installation media. The devicemapper case uses the existing
kickstart and depends on the existing docker-storage-setup "use 40% of VG free space
for a dm-thin pool"; the overlay2 kickstart would cause the installer to use all
available space for rootfs, leaving no unused space in the VG.
So I hardly ever use interactive installs, but that is a valid case. I would think most
people would be using their own kickstart file if they are installing a server fresh and
they would set up storage the way they want it to be set up, right? I tend to think more
about the cloud use case where you spin up a preconfigured image. What I was referring to
is having `docker-storage-setup` be able to make the switch for us. It turns out that we
have the storage configured like this in the baked images (note this is before
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdb 8:16 0 10G 0 disk
sdc 8:32 0 368K 0 disk
sda 8:0 0 20G 0 disk
├─sda2 8:2 0 19.7G 0 part
│ └─atomicos-root 253:0 0 9G 0 lvm /sysroot
└─sda1 8:1 0 300M 0 part /boot
This means we can essentially look at if the user provided `overlay` or `DM` and do
whatever they asked.
- If they provided overlay then we can just extend the root partition and go on our merry
- If they also specified `DOCKER_ROOT_VOLUME=yes` then they want overlay on another
partition, did they specify a partion? yes, use that one. no, create an LV.
- If they provided DM then create new LVs and set it up just like we have been doing
before this discussion started.
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