Setup wifi with cloud-init on Rpi3

user-data

write_files:
  - content: |
      allow-hotplug wlan0
      iface wlan0 inet dhcp
      wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
      iface default inet dhcp
    path: /etc/network/interfaces.d/wlan0
  - content: |
      ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
      update_config=1
      
      network={
      ssid="MY_SSID"
      psk="MY_PASSWORD"
      proto=RSN
      key_mgmt=WPA-PSK
      pairwise=CCMP
      auth_alg=OPEN
      }
    path: /etc/wpa_supplicant/wpa_supplicant.conf
power_state:
  delay: now
  mode: reboot
  condition: true

Why is it so $&#*$ !!? Because:

• cloud-init is not design for wifi configuration

• User-data cannot change an instance’s network configuration. In the absence of network configuration in any of the above sources , Cloud-init will write out a network configuration that will issue a DHCP request on a “first” network interface.

• it is sunday