RPi Install

1. Get Raspbian / Raspberry Pi OS

2. Copy image to SD card

3. Enable metadata checksums for ext4:

   e2fsck -fD /dev/${sdcard}2
   resize2fs -b /dev/${sdcard}2
   tune2fs -O metadata_csum /dev/${sdcard}2
   

Note

This enables 64bit mode which supports longer checksums.

1. Mount:

   mount /dev/${sdcard}2 /mnt
   

2. Enable SSHD:

   ln -s /lib/systemd/system/ssh.service /mnt/etc/systemd/system/sshd.service
   ln -s /lib/systemd/system/ssh.service /mnt/etc/systemd/system/multi-user.target.wants/ssh.service
   

Note

It’s possible use chroot to enable SSHD via systemctl but that only works if the binary format of the target is supported:

systemctl --root /mnt enable ssh

1. Set temporary password for pi:

   sudo chpasswd -c SHA512 --root /mnt <<<"pi:${PASSWORD}"
   

2. Manage ethernet via networkd

   Create /mnt/etc/systemd/network/50-ether.network:

   [Match]
   Type=ether
   
   [Network]
   DHCP=yes
   
   [DHCP]
   SendHostname=false
   

3. Disable dhcpcd:

   rm /mnt/etc/rc2.d/S01dhcpcd
   

4. Enable networkd:

   systemctl --root /mnt enable systemd-networkd
   

5. Enabled resolved:

   systemctl --root /mnt enable systemd-resolved
   

6. Create random seed for systemd-random-seed.service:

   install -m 600 -o root -g root /dev/null /mnt/var/lib/systemd/random-seed
   dd if=/dev/urandom of=/mnt/var/lib/systemd/random-seed bs=1 count=512
   

7. Umount:

   umount /mnt
   

8. Bring RPi online and connect via SSH

9. Remove dhcp client:

   apt remove dhcpcd5