diff options
| -rw-r--r-- | README.org | 154 |
1 files changed, 144 insertions, 10 deletions
@@ -63,22 +63,32 @@ From this we extract the necessary guix bootloader configuration options (for se - terminal-inputs :: console serial - terminal-outputs :: console serial -*** TODO Manual modifications to Debian's Grub +*** Manual modifications to Debian's Grub -In ~/etc/default/grub~ we need to modify ~GRUB_DEFAULT=<MENU_ITEM>~ +Modify grub config on debian to add an additional (and default) option to chainload Guix +grub. -TODO ... +- Add a menuitem for Guix in ~/etc/grub.d/40_custom~, where ~<EFI-UUID>~ is replaced with the + efi partition UUID. -Modify grub config on debian to add an additional (and default) option to chainload Guix grub + #+begin_src text + menuentry "Gnu Guix" { + insmod part_gpt + insmod search_fs_uuid + insmod chain + search --fs-uuid --no-floppy --set=root <EFI-UUID> + chainloader ($root)/EFI/Guix/grubx64.efi + } + #+end_src -- Add a menuitem for Guix in ~/etc/grub.d/40_custom~ -- Modify ~/etc/default/grub~ setting ~GRUB_DEFAULT=<n>~ where ~<n>~ is the menu item number, - starting from 0, or (preferably) the menu item name/id. +- Modify ~/etc/default/grub~ setting ~GRUB_DEFAULT="Gnu Guix"~ + +- Run ~grub-mkconfig -o /boot/grub/grub.cfg~ ** Network configuration -Using the a snippet from ~/etc/network/interfaces~ below, we can extract the necessary details -to configure Guix's static-networking-service. +Using the a snippet taken from ~/etc/network/interfaces~ on the existing debian installation +(below), we can extract the necessary details to configure Guix's static-networking-service. - Interface :: eno8303 - Address :: 216.37.76.55/24 @@ -102,6 +112,15 @@ to configure Guix's static-networking-service. For this installation we are using ~/dev/sda~ (a 1.5T ssd which is faster then the alternative 3.6T ssd in the server). +First, we require a variety of tools to setup and partition the disk destined for Guix +installation. These could be installed on debian, however an alternative approach would be to +use Guix from debian as a package manager to temporarily provide the prerequisite tools. This +can be done using the shell spawned from the following command. + +#+begin_src shell + guix shell parted btrfs-progs dosfstools +#+end_src + *** Create disk partition table and layout #+begin_src bash @@ -176,9 +195,10 @@ Create nested subvolumes for ~/gnu/store~ and ~/home~. #+begin_src bash mkdir /mnt/swap mount -o subvol=@swap /dev/sda2 /mnt/swap - dd if=/dev/zero of=/mnt/swap/swapfile bs=1M count=32768 chmod 600 /mnt/swap/swapfile + touch /mnt/swap/swapfile chattr +C /mnt/swap/swapfile + dd if=/dev/zero of=/mnt/swap/swapfile bs=1M count=32768 mkswap /mnt/swap/swapfile #+end_src @@ -202,7 +222,121 @@ To test the configuration in a vm before deployment, the following can be used. $(guix time-machine -C channels.scm -- system vm -e '(@ (guix-na config balg02) %system)') -m 2G -smp 2 -nic user,model=virtio-net-pci #+end_src +** Manual Testing of bootstrapping Guix from a Debian VM + +To correctly test this deployment, a environment that mimics bal02g should be used. The +closest to this is a VM with debian installed, with an additional virtual disk to bootstrap +guix onto. This will enable validating bootloader changes required to chainboot Guix's Grub. + +This testing could be automated, but was done manually as we do not expect to have to +bootstrap a system like this often. + +*** Setup Debian VM + +1. Using ~qemu~, ~libvirt~, ~virtualbox~, etc.. create a VM that boots using UEFI firmware. + + 1. Create an additional virtual disk that will be used to bootstrap Guix onto from Debian. + This disk should be ~>20GiB~. + + 2. Ensure that there is a serial device attached to the VM. + +2. Install Debian 12 on the VM created during step 1 (this can be a minimal server + installation, no desktop, etc..). + + 1. It's worth noting that for some reason debian didn't setup a efi boot + entry for some reason. Not sure why. To create one I used: + + #+begin_src shell + efibootmgr --create --disk /dev/vda -p 1 -L "Debian" -l "\EFI\debian\grub64.efi" + #+end_src + + After which I would have adjusted the boot order with: + + #+begin_src shell + efibootmgr -o X,Y,... + #+end_src + + However, in my case it was not needed as the boot order had debian first. + +3. Reboot VM; further configure Debian. + + 1. Enable serial for debian grub + + Modify ~/etc/default/grub~, adjusting ~GRUB_TERMINAL~ and ~GRUB_CMDLINE_LINUX_DEFAULT~ as + follows. + + #+begin_src text + GRUB_TERMINAL="console serial" + GRUB_CMDLINE_LINUX_DEFAULT="console=tty1 console=ttyS0,115200n8" + #+end_src + + 2. Enable getty over serial + + #+begin_src shell + systemctl enable getty@ttyS0.service + systemctl start getty@ttyS0.service + #+end_src + +*** Test Bootstrapping Gnu Guix from Debian + +With the Debian VM setup, we can now apply the documented bootstrapping steps. + +1. [[*Disk Partitioning][Disk Partitioning]], but with disks adjusted to match the testing VM. +2. [[*Bootstrap Guix][Bootstrap Guix]], ensure ~<EFI-UUID>~ matches the VM efi partition used for Guix. +3. [[*Manual modifications to Debian's Grub][Manual modifications to Debian's Grub]], again ensuring ~<EFI-UUID>~ matches the VM efi + partition used for Guix. +4. Reboot + +Following rebooting the VM, its expected that: + +- Debian Grub boots first, has "Gnu Guix" as its default selected option, which boots Guixs' + Grub. +- Serial access works for: + - Debian and Guix Grub/s + - Debian and Guix linux console + +As this testing is occurring in a VM, its worth noting things that are NOT expected to to be +testable. + +- The network interfaces are not going to match what is on balg02, so its expected that the + networking service will not be able to start. + * Bootstrap Guix Using Guix on debian, bootstrap the machine using the configuration in [[*Define Guix operating-system for the machine][Define Guix operating-system for the machine]]. + +** Configure Guix Channels + +First, fetch the most recent channel file from the target machine. + +#+begin_src shell + curl -O https://git.rekahsoft.ca/rekahsoft/guix-north-america/raw/branch/master/channels.scm +#+end_src + +** Create and Bootstrap System + +Create a ~bootstrap.scm~ file like below, but where ~<EFI-UUID>~ is replaced with the efi +partition UUID. + +#+begin_src scheme + ((@ (guix-na config balg02) balg02) "<EFI-UUID>") +#+end_src + +Use ~guix system init ...~ to instantiate the system, but using guix time-machine to use +pinned dependencies. + +#+begin_src shell + guix time-machine -C channels.scm -- system init bootstrap.scm /mnt +#+end_src + +** Post Boostrapping + +After guix has been bootstrapped, its useful to do an initial ~guix pull~ using the same +channels that were used during bootstrapping. + +#+begin_src shell + guix pull -C /run/current-system/channels.scm +#+end_src + +To ensure your shell refers to the correct guix after its been updated, run ~hash guix~. |