======Monitoring serveur et activités du disque dur avec Raspberry Pi======
===== Introduction =====

Pour illustrer le fait qu'un son peut altérer l'écriture sur un disque ou plus globalement pour monitorer l'activité d'un serveur, on va utiliser la combinaison de collectd, influxdb et grafana à installer sur une raspberry pi

Cette illustration est notamment faite pour l'exposition "go cany go" pour laquelle un dispositif est créé afin d'illustrer le phénomène vu dans cette vidéo :

{{ youtube>tDacjrSCeq4 }}

  * [[https://motherboard.vice.com/en_us/article/a-loud-sound-just-shut-down-a-banks-data-center-for-10-hours|a loud sound just shut down a banks data center for 10 hours sur motherboard.vice.com
]]
===== Installation =====

==== Netdata ====

Un outil simple, joli et facile à installer https://github.com/firehol/netdata

  * installer avec l'automatique installer https://github.com/firehol/netdata/wiki/Installation
  * aller sur http://localhost:19999

{{ media_05:c882bbf4-f554-11e5-8863-1788d643d2c0.gif?600 |}}

===== Installation scripts =====
Installer netdata :

  bash <(curl -Ss https://my-netdata.io/kickstart.sh)

==== Install brute ====

  sudo apt install sox openvpn
  
Ajouter config file openvpn dans le home, créer le fichier datacrash.sh dans le home, chmod +x

Mettre le son par défaut sur Analog + volume max + sudo alsactl store

<code bash>
datacrash.sh
#!/bin/bash
# en bas du fichier
# sudo nano /home/pi/.config/lxsession/LXDE-pi/autostart
# @chromium-browser --kiosk http://localhost:19999/#menu_disk_submenu_sda;theme=slate;help=true;update_always=true
# mount external hdd via fstab /dev/sda1         /media/usbhdd     ext4    defaults           0       0
# python off-button.py &
sleep 10
while true
do
sudo dd if=/dev/zero of=/media/usbhdd/oo bs=512 count=500M &
sleep 120
play -n synth 20 sin 300 gain -15 &
sleep 6
play -n synth 8 sin 295 gain -15 &
sleep 2
play -n synth 4 sin 290 gain -15
sleep 180
sudo killall dd
sudo rm /media/usbhdd/oo
sleep 3
done

/etc/rc.local

openvpn --config /home/pi/install3.ovpn &

python /home/pi/pioff.py &

cd /home/pi/
sudo ./datacrash.sh

sudo nano /home/pi/.config/lxsession/LXDE-pi/autostart

ou plutot

sudo nano /etc/xdg/lxsession/LXDE-pi/autostart

@lxpanel --profile LXDE-pi
@pcmanfm --desktop --profile LXDE-pi
@xscreensaver -no-splash
@point-rpi
@xset s off
@xset -dpms
@xset s noblank
@chromium-browser --kiosk http://localhost:19999/#menu_disk_submenu_sda;theme=slate;help=true;update_always=true
</code>

**Script pour extinction propre de la pi avec bouton externe**

pioff.py
<code python>
#!/bin/python
#This script was authored by AndrewH7 and belongs to him (www.instructables.com/member/AndrewH7)
#You have permission to modify and use this script only for your own personal usage
#You do not have permission to redistribute this script as your own work
#Use this script at your own risk

import RPi.GPIO as GPIO
import os

gpio_pin_number=21
#Replace YOUR_CHOSEN_GPIO_NUMBER_HERE with the GPIO pin number you wish to use
#Make sure you know which rapsberry pi revision you are using first
#The line should look something like this e.g. "gpio_pin_number=7"

GPIO.setmode(GPIO.BCM)
#Use BCM pin numbering (i.e. the GPIO number, not pin number)
#WARNING: this will change between Pi versions
#Check yours first and adjust accordingly

GPIO.setup(gpio_pin_number, GPIO.IN, pull_up_down=GPIO.PUD_UP)
#It's very important the pin is an input to avoid short-circuits
#The pull-up resistor means the pin is high by default

try:
    GPIO.wait_for_edge(gpio_pin_number, GPIO.FALLING)
    #Use falling edge detection to see if pin is pulled 
    #low to avoid repeated polling
    os.system("sudo shutdown -h now")
    #Send command to system to shutdown
except:
    pass

GPIO.cleanup()
#Revert all GPIO pins to their normal states (i.e. input = safe)
</code>
===== Références =====

  * https://sonnguyen.ws/monitor-server-with-collectd-influxdb-and-grafana/
  * http://giatro.me/2015/09/30/install-influxdb-and-grafana-on-raspberry-pi.html
  * stats disk du kernel https://www.kernel.org/doc/Documentation/iostats.txt



{{tag>bj micro_ordinateur raspberry_pi serveur linux}}