Replace Oracle Cloud Linux with Arch Linux ARM remotely

convert1.md

Refs:

1. http://os.archlinuxarm.org/os/ArchLinuxARM-aarch64-latest.tar.gz
2. https://dl-cdn.alpinelinux.org/alpine/v3.13/releases/aarch64/alpine-virt-3.13.5-aarch64.iso
3. https://wiki.alpinelinux.org/wiki/Replacing_non-Alpine_Linux_with_Alpine_remotely
4. https://wiki.archlinux.org/index.php/installation_guide#Configure_the_system
5. https://archlinuxarm.org/platforms/armv8/generic

Requirement: Console access.

1. In Oracle Linux 8.0

cd /tmp
wget https://dl-cdn.alpinelinux.org/alpine/v3.13/releases/aarch64/alpine-virt-3.13.5-aarch64.iso
dd if=alpine-virt-3.13.5-aarch64.iso of=/dev/sda; sync
reboot

2. In Alpine w/ Console access:

[Bring up networking]

In /etc/network/interfaces, add:

auto eth0
iface eth0 inet dhcp

ifup eth0

[Per Ref #3]

mkdir /media/setup
cp -a /media/sda/* /media/setup
mkdir /lib/setup
cp -a /.modloop/* /lib/setup
/etc/init.d/modloop stop
umount /dev/sda
mv /media/setup/* /media/sda/
mv /lib/setup/* /.modloop/

[Setup apk and bring in pacman]

setup-apkrepos
vi /etc/apk/repositories, enable community
apk update
apk add dosfstools e2fsprogs libarchive-tools pacman arch-install-scripts btrfs-progs
modprobe btrfs

[Disk partitioning & mounting]

fdisk /dev/sda

Press "g", then "n", partition 15, size +512M.

Press "t", then "1".

Press "n", partition 1.

(use gpt table, set esp partition 15 size 512M), set root partition 1 size remaining)

mkfs.vfat /dev/sda15
mkfs.btrfs -L Kokoro /dev/sda1
mount /dev/sda1 /mnt
mkdir -p /mnt/boot
mount /dev/sda15 /mnt/boot
cd /mnt
wget http://os.archlinuxarm.org/os/ArchLinuxARM-aarch64-latest.tar.gz
bsdtar -xpf /mnt/ArchLinuxARM-aarch64-latest.tar.gz -C /mnt
genfstab -U /mnt >> /mnt/etc/fstab
arch-chroot /mnt/
pacman-key --init
pacman-key --populate archlinuxarm

[EFI boot]

pacman -Syu efibootmgr
bootctl install

[systemd-boot config]

In /boot/loader/entries/arch.conf, add:

title   Arch Linux
linux   /Image
initrd  /initramfs-linux.img
options root="PARTUUID=arch_os" rw

vi /etc/ssh/sshd_config and update to "PasswordAuthentication no" change to user 'alarm', create ~/.ssh and ~/.ssh/authorized_keys

At this point you should be able to issue 'reboot' and use ssh keyless login to remote into new alarm system.