Setup Raspberry Pi Zero W headless

Download desired OS image from https://www.raspberrypi.com/software/operating-systems/ and unzip.
Image SD Card with Raspberry OS:

$ sudo dd if=2021-10-30-raspios-bullseye-armhf-lite.img of=/dev/sdc bs=4M conv=fsync status=progress

Create wpa_supplicant.conf at root of boot partition:

$sudo vi /media/myuser/wpa_supplicant.conf

Contents of wpa_supplicant.conf:

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=US

network={
     ssid="myssid"
     psk="mywifipassword"
     key_mgmt=WPA-PSK
}

Create ssh file at root of boot partition:

$ sudo touch /media/myuser/boot/ssh

Insert SD Card in Pi and power on.
Login to pi over ssh. Username "pi", password "raspberry".
Change password for pi to something different, passwd.
Set password for root, sudo passwd root.
Do apt update and apt upgrade, sudo apt update and sudo apt upgrade.
Install vim and set editor to vim-basic:

$ sudo apt install vim
$ sudo update-alternatives --config editor

Edit /etc/ssh/sshd_config to make PermitRootLogin yes.
Use raspi-config to:
- change hostname
- set locale
- set timezone
- expand disk
Test network connectivity (like, ping your gateway and /etc/resolv.conf).
Prevent wifi going to sleep by adding this line to /etc/rc.local just above exit 0:

iwconfig wlan0 power off

plembo/raspizerowsetup.md

Setup Raspberry Pi Zero W headless