Armbian hostname and WiFi configuration

2016-07-06

In previous post i have described installation of Armbian on Orange Pi PC Plus. Now is the time for some initial configuration (hostname and WIFI setup).

Changing hostname
Configuring WIFI to work with WPA2

Changing hostname

Check current hostname with hostname
Check current fully qualified domain name (or FQDN) with hostname --fqd
Set new hostname: sudo hostname pi
Update /etc/hostname for Debian to get new hostname after reboot

Update /etc/hosts so that FQDN is before short localhost next to IP:

127.0.0.1   pi.example.com pi localhost
::1         pi.example.com pi localhost ip6-localhost ip6-loopback
fe00::0     ip6-localnet
ff00::0     ip6-mcastprefix
ff02::1     ip6-allnodes
ff02::2     ip6-allrouters

Reboot with sudo reboot

Configuring WIFI to work with WPA2

There are various ways for configuring WIFI with wpa_suplicant. You may consider settings things up in /etc/network/interfaces if you want WIFI to be started automatically upon system startup. I have decided on another approach: using script for starting all manually.

wpa_supplicant should be installed but needs to be run as root: sudo wpa_supplicant -v.`
In the next steps you will need BSSID (access point MAC address) and channel. Turn on your WIFI card with sudo ifconfig wlan0 up and scan for your network with sudo iwlist wlan0 scan | egrep 'Address|ESSID|Channel'.
Prepare configuration file for wpa_supplicant in /etc/wpa_supplicant folder. You could have more files there with different names. Our file will be named wifi.conf.

Adjust the content of the file: replace 00:14:6C:AE:EA:AE, my-wifi and P@ssw0rd with your access point MAC address, your WIFI network name and your WIFI password respectively:

ctrl_interface=DIR=/var/run/wpa_supplicant
network={
        bssid=00:14:6C:AE:EA:AE
        ssid="my-wifi"
        scan_ssid=1
        key_mgmt=WPA-PSK
        psk="P@ssw0rd"
}

Create a script and add execute permissions. Replace my-wifi, 8 and wifi.conf with your WIFI name, channel and WPA supplicant configuration file name:

#!/usr/bin/env bash
DEV=$(iw dev | awk '/Interface/ {interf=$2} END {print interf}')
DHCL_PIDFILE=/var/run/dhclient-$DEV.pid
WPA_PIDFILE=/var/run/wpa_supplicant-$DEV.pid
if [[ -f $DHCL_PIDFILE ]] && kill -9 $(cat $DHCL_PIDFILE)
then
    dhclient -v -r $DEV
    echo "IP address released"
fi
if [[ -f $WPA_PIDFILE ]] && kill -9 $(cat $WPA_PIDFILE)
    then
    echo "WPA supplicant killed"
fi
killall wpa_supplicant
echo "wpa_supplicant killed :)"
ifconfig -v $DEV down
sleep 1
ifconfig -v $DEV up
echo "$DEV interface is up again"
iwconfig $DEV essid 'my-wifi' channel 8
echo "starting wpa_supplicant.."
sleep 2
wpa_supplicant -B -dd -i$DEV -P$WPA_PIDFILE -c/etc/wpa_supplicant/wifi.conf
sleep 2
echo "getting IP address.."
dhclient -v -pf $DHCL_PIDFILE $DEV

Run the script as root

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