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+---
+categories:
+- embedded
+date: 2016-01-30
+title: Installing Arch Linux ARM on a Raspberry Pi
+---
+
+My cheat sheet for deploying multiple Arch Linux machines, Raspberry Pis here.
+Installs `pacserve`, `rngd` and `yaourt` in a btrfs subvolume `root`. To allow local users to poweroff, `polkit` is also installed.
+
+# Filesystem setup
+See also the [Archlinux ARM guide](http://archlinuxarm.org/platforms/armv6/raspberry-pi).
+
+Change `sdx` to `sdb`/`sdc`/…
+``` bash
+sudo fdisk /dev/sdx
+sudo mkfs.btrfs /dev/sdx2
+sudo mkfs.vfat /dev/sdx1
+mkdir -p tmp/{r,b}oot
+cd tmp
+sudo mount /dev/sdx2 root
+sudo btrfs subvolume create root/root
+sudo umount root
+```
+
+# Copying the files
+Use `ArchLinuxARM-rpi-2-latest.tar.gz` for the Raspberry Pi 2 or 3.
+``` bash
+wget http://archlinuxarm.org/os/ArchLinuxARM-rpi-latest.tar.gz
+sudo mount /dev/sdx1 boot
+sudo mount -o subvol=root,autodefrag,compress=lzo /dev/sdx2 root
+sudo su -c "bsdtar -xpf ArchLinuxARM-rpi-latest.tar.gz -C root" && sync
+sudo mv root/boot/* boot
+sudo umount boot
+sudo mount /dev/sdx1 root/boot
+```
+
+# QEMU chroot
+[Optional](https://wiki.archlinux.org/index.php/Raspberry_Pi#QEMU_chroot). You can skip this and power the Pi up instead.
+
+``` bash
+sudo cp /usr/bin/qemu-arm-static root/usr/bin
+sudo arch-chroot root /bin/bash
+```
+
+# Configuration
+``` bash
+echo "root=/dev/mmcblk0p2 rootflags=subvol=root,autodefrag,compress=lzo rw rootwait console=tty1 elevator=deadline" > /boot/cmdline.txt
+sed -i "s/gpu_mem=64/gpu_mem=16/" /boot/config.txt
+
+cat << EOF >> /boot/config.txt
+start_file=start_x.elf
+fixup_file=fixup_x.dat
+start_x=1
+EOF
+
+sed -i '/\[options\]/a CacheDir    = /var/cache/pacman/pkg/' /etc/pacman.conf
+sed -i '/\[options\]/a CleanMethod = KeepCurrent' /etc/pacman.conf
+cat << EOF >> /etc/pacman.conf
+[archlinuxfr]
+SigLevel = Never
+Server = http://repo.archlinux.fr/arm
+
+[xyne-any]
+Server = http://xyne.archlinux.ca/repos/xyne
+EOF
+```
+
+# Package installation
+``` bash
+pacman -Syu --needed pacserve git yajl rng-tools polkit archlinuxarm-keyring archlinux-keyring base-devel
+systemctl enable pacserve rngd
+echo 'RNGD_OPTS="-o /dev/random -r /dev/hwrng"' > /etc/conf.d/rngd
+echo "alarm ALL=(ALL) ALL" >> /etc/sudoers
+pacman.conf-insert_pacserve > /tmp/pacman.conf
+mv /tmp/pacman.conf /etc/pacman.conf
+su alarm
+cd
+git clone https://aur.archlinux.org/package-query.git
+cd package-query
+makepkg -s
+mv package-query*.tar.xz /tmp
+cd ..
+rm -rf package-query
+exit
+pacman -U /tmp/package-query*.tar.xz
+pacman -S yaourt
+exit
+```
+
+`sudo umount root/boot root` or `reboot`
+
+# Post installation (on the Pi)
+SSH into alarm with password alarm. root password is root, but SSH login for root is by default disabled.
+``` bash
+sudo hostnamectl set-hostname xxx
+sudo timedatectl set-timezone Yourtime/zone
+sudo vi /etc/systemd/timesyncd.conf
+sudo timedatectl set-ntp true
+sudo pacman-key --init
+passwd
+sudo passwd
+```
+
+# Troubleshooting
+Can't unmount for some reason? Use the hammer (not recommended): `sudo fuser -km mntpoint || sudo umount -l mntpoint`
+
+# Further information
+For more, see [the Arch wiki](https://wiki.archlinux.org/index.php/Raspberry_Pi).