Armbian hostname and WiFi configuration

分手后的思念是犯贱 2022-06-15 12:06 207阅读 0赞

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).

### Table of Contents ###

*  [Changing hostname][]
 *  [Configuring WIFI to work with WPA2][]

### Changing hostname ###

1.  Check current hostname with `hostname`
2.  Check current fully qualified domain name (or FQDN) with `hostname --fqd`
3.  Set new hostname: `sudo hostname pi`
4.  Update `/etc/hostname` for Debian to get new hostname after reboot
5.  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
6.  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.

1.  wpa\_supplicant should be installed but needs to be run as root: `sudo wpa_supplicant -v`.\`
2.  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'`.
3.  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`.
4.  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"
        }
5.  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
6.  Run the script as root

[previous post]: https://www.kubiczak.pl/blog/installing-armbian-on-orange-pi/
[Changing hostname]: https://www.kubiczak.pl/blog/armbian-hostname-and-wifi-configuration/#changing-hostname:47f15adc8cb7b090e97bd40f91d5e282
[Configuring WIFI to work with WPA2]: https://www.kubiczak.pl/blog/armbian-hostname-and-wifi-configuration/#configuring-wifi-to-work-with-wpa2:47f15adc8cb7b090e97bd40f91d5e282