$ sudo cat /etc/network/interfaces
# Loopback
auto lo
iface lo inet loopback

# 10/100 Ethernet
auto eth0
iface eth0 inet dhcp

# Wireless
# Roaming Configuration
auto wlan0
iface wlan0 inet dhcp
        wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

#iface default inet dhcp


$ sudo cat /etc/wpa_supplicant/wpa_supplicant.conf
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel
ap_scan=0
#update_config=1

network={
   ssid="Phoenix"
   #psk=<HASHED KEY>
   psk="<KEY>"
   proto=WPA2
   key_mgmt=WPA-PSK
   pairwise=CCMP
   group=CCMP
   priority=5
}

#network={
#	key_mgmt=NONE
#}