Raspbian headless install over Wifi

TLDR; Configure your new PI without a monitor

Just follow this guide to install your raspberry pi 3 without a monitor. It enables wifi and ssh in the default raspbian installation.

1. install raspbian on your sdcard:

export DEV=/dev/sdX; \
unzip 2017-04-10-raspbian-jessie-lite.zip ;\
cd 2017-04-10-raspbian-jessie-lite ;\
sudo dd if=2017-04-10-raspbian-jessie-lite.img of=$DEV bs=4M && sudo sync

1. mount boot partition
2. enable ssh:

   sudo touch /mountpoint/To/bootPartition/ssh     

3. mount root partition
4. edit /etc/wpa/wpa_supplicant.conf to:

   country=GB
   ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
   update_config=1
   
   
   network={
   ssid="MyWifiName"
   psk="MyWifiPassword"
   }

5. nmap for new devices: 

   nmap 192.168.178.0/24 -p 22 --open

   ...
   Nmap scan report for raspberrypi.fritz.box (192.168.178.137)
   Host is up (0.0099s latency).
   PORT   STATE SERVICE
   22/tcp open  ssh
   MAC Address: B8:27:EB:1F:25:A2 (Raspberry Pi Foundation)

6. login with password raspberry: 

   ssh pi@raspberrypi

7. do whatever you want: 

   sudo apt-get update && \
   sudo apt-get upgrade -y && \
   sudo apt-get dist-upgrade -y && \
   sudo apt-get install --reinstall raspberrypi-bootloader raspberrypi-kernel
   

And that’s all.