How to setup a headless Raspberry Pi

Summary of steps

  • Write a disk image to the SD card
  • Add wifi credentials and enable ssh
  • Change the Pi’s hostname and add ssh key(s)
  • Reboot
  • Verify passwordless authentication works
  • Disable password authentication

Write a disk image to the SD card.

Setup wifi and enable ssh

$ cd /Volumes/boot # this path may vary
$ touch ssh
$ vi wpa_supplicant.conf
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=GB
network={
ssid="SSID"
psk="PASSWORD"
}

Hostnames and usernames

$ ssh pi@raspberrypi.local
$ # or ssh ubuntu@ubuntu.local

Change the hostname and add ssh keys

$ sudo vi /etc/hostname
$ sudo vi /etc/hosts
$ cd ~
$ mkdir .ssh
$ chmod 700 .ssh
$ # make sure to run this on the local machine, not the pi
$ scp ~/.ssh/id_rsa.pub pi@raspberrypi.local:.ssh/authorized_keys
$ # alternatively, on the pi:
$ vi .ssh/authorized_keys # and paste the public key

Reboot

$ sudo reboot now

Login again

$ ssh pi@newhostname.local

Disable password authentication

$ sudo vi /etc/ssh/sshd_config
PasswordAuthentication no
sudo systemctl restart sshd.service

Ready to go

$ sudo apt update && sudo apt upgrade

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Alex Bostock

Alex Bostock

https://alexbostock.co.uk

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