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June 15, 2020 22:42
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ubuntu autoinstall with btrfs subvolumes
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| #cloud-config | |
| autoinstall: | |
| version: 1 | |
| identity: | |
| hostname: btrbox | |
| password: "$6$exDY1mhS4KUYCE/2$zmn9ToZwTKLhCw.b4/b.ZRTIZM30JZ4QrOQ2aOXJ8yk96xpcCof0kxKwuX1kqLG/ygbJ1f8wxED22bTL4F46P0" | |
| username: ubuntu | |
| storage: | |
| config: | |
| ### drive | |
| - id: disk0 | |
| type: disk | |
| ptable: gpt | |
| grub_device: true | |
| preserve: false | |
| wipe: superblock | |
| ### partitions | |
| - id: efi_partition | |
| type: partition | |
| size: 512MB | |
| device: disk0 | |
| flag: boot | |
| grub_device: true | |
| preserve: false | |
| - id: swap_partition | |
| type: partition | |
| size: 8GB | |
| device: disk0 | |
| flag: swap | |
| preserve: false | |
| - id: root_partition | |
| type: partition | |
| size: -1 | |
| device: disk0 | |
| preserve: false | |
| ### format and mount efi partition | |
| - id: efi_format | |
| type: format | |
| fstype: fat32 | |
| volume: efi_partition | |
| preserve: false | |
| - id: efi_mount | |
| type: mount | |
| path: /boot/efi | |
| device: efi_format | |
| ### format and mount swap partition | |
| - id: swap_format | |
| type: format | |
| fstype: swap | |
| volume: swap_partition | |
| preserve: false | |
| - id: swap_mount | |
| path: none | |
| type: mount | |
| device: swap_format | |
| ### format and mount root partition | |
| - id: root_format | |
| type: format | |
| fstype: btrfs | |
| volume: root_partition | |
| preserve: false | |
| - id: root_mount | |
| type: mount | |
| path: / | |
| device: root_format | |
| late-commands: | |
| - | | |
| set -ex | |
| EFI_DEV=$(awk '$2 == "/target/boot/efi" { print $1 }' /proc/mounts) | |
| ROOT_DEV=$(awk '$2 ~ "^/target$" { print $1 }' /proc/mounts) | |
| ROOT_UUID=$(blkid -o value $ROOT_DEV | head -n 1) | |
| awk '$2 ~ "^/target/" { print $2 }' /proc/mounts | xargs umount | |
| btrfs subvolume snapshot /target /target/rootfs | |
| mkdir /mnt/rootfs | |
| mount -o subvol=rootfs $ROOT_DEV /mnt/rootfs | |
| mount $EFI_DEV /mnt/rootfs/boot/efi | |
| mount -o bind /dev /mnt/rootfs/dev | |
| mount -o bind /sys /mnt/rootfs/sys | |
| mount -o bind /proc /mnt/rootfs/proc | |
| sed -i "/$ROOT_UUID/s/defaults/defaults,noatime,subvol=rootfs/" /mnt/rootfs/etc/fstab | |
| chroot /mnt/rootfs update-grub | |
| chroot /mnt/rootfs grub-install --efi-directory=/boot/efi | |
| find /target -mindepth 1 -maxdepth 1 -not -name rootfs -exec rm -rf '{}' \; | |
| btrfs subvolume create /target/home | |
| echo "/dev/disk/by-uuid/$ROOT_UUID /home btrfs defaults,noatime,subvol=home 0 0" >> /mnt/rootfs/etc/fstab | |
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I faced this in writing my autoinstall for a laptop. After /var/log is moved to a subvolume and removed from /target/ the final step of copying install logs fails. You can fix this by adding this to the end of your autoinstall late commands:
umount /target/ && mkdir -p /target/var/log/ && mount -o subvol=@var_log $ROOT_DEV /target/var/log/ #needed for install logs
You may need to modify depending on if your have /var/log, /var, or both as subvolumes.
I went a little overboard with mine. Here is what I am currently testing on server 24.04.