# use 'wpa_passphrase <ssid> <psk> >> <this file>' to get wpa-psk

auto wlp2s0
iface wlp2s0 inet static
    wpa-ssid <ssid>
    wpa-psk  <encoded string>
    address  192.168.1.21
    netmask  255.255.255.0
    gateway  192.168.1.1
    dns-nameservers 8.8.8.8 1.1.1.1 192.168.12.1