169 lines
No EOL
5 KiB
Markdown
169 lines
No EOL
5 KiB
Markdown
# Installation
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To install the Alpine Linux distribution on the system, the root subvolume and the efi partition have to be mounted to the main system.
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```
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# mount -o subvol=@root /dev/mapper/luks /mnt -t btrfs
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# mkdir /mnt/efi -p
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# mount /dev/<disk>1 /mnt/efi -t vfat
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```
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Then set up the base system using `setup disk`:
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```
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# setup-disk -m sys /mnt
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```
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This will also add grub as bootloader which will be replaced but for now it will reside on the efi partition.
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To make it possible to chroot into the system, mount the other directories:
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```
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# for i in dev proc sys run; do
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> mount --rbind --make-rslave /$i /mnt/$i
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> done
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# chroot /mnt
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```
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The other setup scripts can be used to configure key aspects of the system. Besides that a few necessary services have to be activated.
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```
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# setup-hostname <hostname>
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# setup-keymap us us-euro
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# setup-timezone -i <area>/<subarea>
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# setup-ntp openntpd
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# rc-update add acpid default
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# rc-update add seedrng boot
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# rm -rf /var/tmp ; ln -s /tmp /var/tmp
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# passwd root
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```
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> The root password does not really matter because it is going to be locked after a user has been created.
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Set the `hwclock` to use `UTC` in `/etc/conf.d/hwclock` and disable writing the time to hardware. Running a NTP negates its usability.
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```
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clock="UTC"
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clock_hctosys="NO"
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clock_systohc="NO"
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```
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Edit `/etc/fstab` for correct mounts:
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```
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/dev/disk/by-label/efi /efi vfat defaults,nodev,nosuid,noexec 0 2
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/dev/disk/by-uuid/<volume-uuid> / btrfs defaults,noatime,subvol=/@root 0 1
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/dev/disk/by-uuid/<volume-uuid> /home btrfs defaults,noatime,nodev,nosuid,subvol=/@home 0 2
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/dev/disk/by-uuid/<volume-uuid> /var btrfs defaults,nodev,nosuid,noexec,subvol=/@var 0 2
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/dev/disk/by-uuid/<volume-uuid> /nix btrfs defaults,noatime,nodev,nosuid,subvol=/@nix 0 2
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tmpfs /tmp tmpfs rw,size=4G,nr_inodes=5k,noexec,nodev,nosuid,mode=1777 0 0
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proc /proc proc nosuid,nodev,noexec,hidepid=2 0 0
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```
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Here `<volume-uuid>` has to be replaced with the uuid of the root volume:
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```
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# blkid /dev/mapper/luks >> /etc/fstab
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```
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By default, Alpine Linux uses `mkinitfs` to create an initial ram filesystem, although it is minimal that also means that it lacks some functionality which is needed for a proper setup. Because of this `mkinitfs` and `grub-efi `will be replaced with `booster` and `secureboot-hook`.
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```
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# apk add booster secureboot-hook sbctl
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# apk del mkinitfs grub-efi
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```
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To configure booster edit `/etc/booster.yaml`:
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```
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busybox: false
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modules: vfat,nls_cp437,nls_iso8859_1
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```
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The most important step is the creation of a UKI using `secureboot-hook` which also automatically signs them. First the hook itself will have to be tweaked to use `booster` instead of `mkinitfs`, edit `/etc/kernel-hooks.d/50-secureboot.hook` and change the line:
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```
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/sbin/mkinitfs -o "$tmpdir"/initramfs "$NEW_VERSION-$FLAVOR"
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```
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to:
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```
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/usr/bin/booster build "$tmpdir"/initramfs --kernel-version "$NEW_VERSION-$FLAVOR"
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```
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and configure `/etc/kernel-hooks.d/secureboot.conf` for cmdline and secureboot.
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```
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cmdline="rw rd.luks.name="<partition-uuid>"=luks root=/dev/disk/by-uuid/<volume-uuid> rootflags=subvol=/@root quiet splash"
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signing_cert="/usr/share/secureboot/keys/db/db.pem"
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signing_key="/usr/share/secureboot/keys/db/db.key"
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output_dir="/efi/EFI/Linux"
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output_name="alpine-linux-{flavor}.efi"
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```
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Here `<partition-uuid>` and `<volume-uuid>` have to be replaced with the uuid of the root partition and volume respectively.
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```
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# blkid /dev/<disk>2 >> /etc/kernel-hooks.d/secureboot.conf
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# blkid /dev/mapper/luks >> /etc/kernel-hooks.d/secureboot.conf
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```
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Use `sbctl` to create secureboot keys and sign them.
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```
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# sbctl create-keys
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# sbctl enroll-keys
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...
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```
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> Whilst enrolling the keys it might be necessary to add the `--microsoft` flag if you are unable to use custom keys.
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Now to see if everything went succesfully run:
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```
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# apk fix kernel-hooks
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```
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and it should give no warnings if done properly.
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As discussed earlier `grub` will be replaced, install `gummiboot` as a bootloader.
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```
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# apk add gummiboot
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# gummiboot install --path=/efi
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# sbctl sign -s /efi/EFI/gummiboot/gummibootx64.efi
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# sbctl sign -s /efi/EFI/Boot/BOOTX64.EFI
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```
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And also remove some remnants of `grub`.
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```
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# rm -rf /efi/EFI/alpine
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# rm -rf /efi/grub
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# rm -rf /etc/default
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# cd /boot && unlink boot
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```
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`gummiboot` can be configured with the file `/efi/loader/loader.conf` with which the timeout and the default OS can be specified.
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```
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default alpine-linux-lts.efi
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timeout 2
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editor no
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```
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Now exit the chroot and you should be able to reboot into a working Alpine system.
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```
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# exit
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# umount -lf /mnt
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# reboot
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```
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When booting up your screen might appear blank, this is the encryption prompt. Enter the encryption key and press enter to boot.
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> Do note that "Linux Boot Manager" will have to be set to load first in your bios. |