Tue 18 Apr 2017 08:48:40 PM -03

Issues

SSH

SSH not working by default on newer (2017) raspbian releases. That's because it's disabled by default. Solution is to create a file called 'ssh' in the boot partition.

Networking

  • You might try to make it allways up with wicd-curses.

Amplifier mode

Some references on using an external soundcard as an amplifier:

Attempts:

man jack_disconnect 
man jack_connect 
man jack_lsp
sudo jack_lsp
sudo apt-get install jack-tools
jackd
jackd --no-realtime
jackd --no-realtime -d alsa
export DBUS_SESSION_BUS_ADDRESS=unix:path=/run/dbus/system_bus_socket jackd --no-realtime -d alsa
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/dbus/system_bus_socket jackd --no-realtime -d alsa
sudo jackd --no-realtime -d alsa
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/dbus/system_bus_socket sudo jackd --no-realtime -d alsa
sudo apt-get install libncurses5-dev libjack-jackd2-dev -y
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/dbus/system_bus_socket sudo jackd --no-realtime -d alsa
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/dbus/system_bus_socket sudo jackd -r -d alsa -d default:CARD=USB

Freezing

At the serial console:

[123916.394903] INFO: rcu_preempt detected stalls on CPUs/tasks:
[123916.413406]         1: (1 GPs behind) idle=dcd/140000000000000/0 softirq=1003110/1003111 fqs=312910 
[123916.447541]         (detected by 0, t=765007 jiffies, g=729122, c=729121, q=347657)
[123916.467769] Task dump for CPU 1:
[123916.484152] puppet          R running      0 29362      1 0x00000002
[123916.503500] rcu_preempt kthread starved for 448421 jiffies!

References:

Montagem automática de volume cifrado

Assumindo:

VOLNAME: nome do disco externo
MEDIA: nome do dispositivo mapeado (device mapper)

No TPC:

dd if=/dev/urandom of=pirotron bs=1024 count=4
keyringer $PROJECT encrypt disks/$MEDIA/luks/root-berry $VOLNAME
scp $VOLNAME berry:~/
wipe $VOLNAME

No raspberry:

sudo mv /home/$USER/$VOLNAME /root/
sudo chmod 0400 /root/$VOLNAME
sudo cryptsetup luksAddKey /dev/sda1 /root/$VOLNAME

No /etc/crypttab:

$VOLNAME        /dev/sda1               /root/$VOLNAME  luks

No /etc/fstab:

/dev/mapper/$VOLNAME /media/$VOLNAME ext4    defaults          0       2

Referências:

  • https://www.howtoforge.com/automatically-unlock-luks-encrypted-drives-with-a-keyfile
  • https://askubuntu.com/questions/450895/mount-luks-encrypted-hard-drive-at-boot

Rede

Arquivo /etc/network/interfaces:

auto lo
iface lo inet loopback

#auto eth0
#allow-hotplug eth0

#iface eth0 inet manual
#iface eth0 inet static
#  address 192.168.0.100
#  netmask 255.255.255.0

auto wlan0
allow-hotplug wlan0

iface wlan0 inet static
  address 192.168.0.100
  netmask 255.255.255.0
  wpa-ssid ACCESS_POINT_NAME
  wpa-psk PSK
  #wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
  post-up /usr/sbin/service shorewall restart

#iface wlan0 inet manual
#  wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
#
#iface ape inet static
#  address 192.168.0.100
#  netmask 255.255.255.0

#iface wlan0 inet manual
#wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

#auto wlan1
#allow-hotplug wlan1
#iface wlan1 inet manual
#wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

Arquivo /etc/wpa_supplicante/wpa_supplicant.conf (por enquanto não utilizado):

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
    ssid="ACCESS_POINT_NAME"
    psk="PSK"
}

O esquema wpa-roam não funciona com interfaces static, então foi necessário usar [https://git.fluxo.info/?p=puppet-nodo.git;a=commit;h=d09f347afc0a99481673f227f83864d06206add6 um script].

Backups

Fazendo o backup do cartão microSD a partir do TPC:

dcfldd if=/dev/sdb | bzip2 > raspberry.img.bz2

References

  • http://linuxonflash.blogspot.com.br
  • http://elinux.org/RPi_Serial_Connection
  • https://www.raspbian.org/RaspbianMirrors