Setting up the raspberry pi watchdog
Introduction
This guide describes how to install the hardware watchdog, a system that knows when your raspberry is down, and will automatically reboot it in case this happens.
This guide will also work for the cubieboard/truck, if you are using the firmware mentioned on this wiki,
the watchdog is already installed and you can continue to Install the software watchdog daemon
Install watchdog
sudo modprobe bcm2835_wdt echo "bcm2835_wdt" | sudo tee -a /etc/modules
Install the software watchdog daemon
sudo apt-get install watchdog sudo update-rc.d watchdog defaults
Configure the watchdog daemon
Open /etc/watchdog.conf with your favorite editor (mine is nano).
sudo nano /etc/watchdog.conf
Uncomment the line that starts with #watchdog-device by removing the hash (#) to enable the watchdog daemon to use the watchdog device. Uncomment the line that says #max-load-1 = 24 by removing the hash symbol to reboot the device if the load goes over 24 over 1 minute. A load of 25 of one minute means that you would have needed 25 Raspberry Pis to complete that task in 1 minute. You may tweak this value to your liking.
In some cases you should also add the following line to allow watchdog even to start-up:
watchdog-timeout = 15
The timeout defaults to 60 seconds, but this results sometimes in not starting up at all (probably a watchdog bug). Do not set this value lower than 15.
If you only want to setup the watchdog to restart in case your system hangs, continue to the section Start the watchdog daemon
Use watchdog to check Domoticz
This script relies on the fact that the Domoticz.log is written in /tmp/ newer installs have this option disabled by default. To make this script work you must enable the logfile.
sudo nano /etc/init.d/domoticz.sh
and change the line OPTIONS="-www 8080" to:
OPTIONS="-www 8080 -loglevel=normal -log /tmp/domoticz.log"
(* Alternative ) In my case, the option must be set up like this
DAEMON_ARGS="$DAEMON_ARGS -www 8080 -loglevel=normal" DAEMON_ARGS="$DAEMON_ARGS -sslwww 443" DAEMON_ARGS="$DAEMON_ARGS -log /tmp/domoticz.log"
Setup mailer:
sudo apt-get update && sudo apt-get upgrade sudo apt-get install sendmail-bin sudo apt-get install sensible-mda sudo apt-get install mutt
Then continue to:
cd /home/pi
create the file .muttrc with the following content: (vi .muttrc or nano .muttrc) # basic .muttrc for use with Gmail # Change the following six lines to match your Gmail account details set imap_user = "[email protected]" set imap_pass = "" set smtp_url = "smtps://[email protected]@smtp.gmail.com:465/" set smtp_pass = "" set from = "[email protected]" set realname = "Firstname Lastname" set use_from = yes set ssl_force_tls = yes # # # Change the following line to a different editor you prefer. set editor = 'vim + -c "set textwidth=72" -c "set wrap"' # Basic config set folder = "imaps://imap.gmail.com:993" set spoolfile = "+INBOX" set imap_check_subscribed=yes set hostname = gmail.com set mail_check = 120 set timeout = 300 set imap_keepalive = 300 set postponed = "+[GMail]/Drafts" set header_cache=~/.mutt/cache/headers set message_cachedir=~/.mutt/cache/bodies set certificate_file=~/.mutt/certificates set move = no set include set sort = 'threads' set sort_aux = 'reverse-last-date-received' set auto_tag = yes set pager_index_lines = 10 ignore "Authentication-Results:" ignore "DomainKey-Signature:" ignore "DKIM-Signature:" hdr_order Date From To Cc alternative_order text/plain text/html * auto_view text/html bind editor <Tab> complete-query bind editor ^T complete bind editor <space> noop # # Gmail-style keyboard shortcuts macro index,pager am "<enter-command>unset trash\n <delete-message>" "Gmail archive message" # different from Gmail, but wanted to keep "y" to show folders. macro index,pager d "<enter-command>set trash=\"imaps://imap.googlemail.com/[GMail]/Bin\"\n <delete-message>" "Gmail delete message" macro index,pager gi "<change-folder>=INBOX<enter>" "Go to inbox" macro index,pager ga "<change-folder>=[Gmail]/All Mail<enter>" "Go to all mail" macro index,pager gs "<change-folder>=[Gmail]/Starred<enter>" "Go to starred messages" macro index,pager gd "<change-folder>=[Gmail]/Drafts<enter>" "Go to drafts" macro index,pager gl "<change-folder>?" "Go to 'Label'" # will take you to a list of all your Labels (similar to viewing folders).
edit the first lines to setup your gmail account info now create an app key for the gmail account to be used as the password
Go to your Google Account. On the left navigation panel, click Security. On the "Signing in to Google" panel, click App passwords. If prompted, enter your password. Note: If you can't get to the page, 2-Step Verification is: Not set up for your account or Set up for security keys only At the bottom, click Select app and choose the app you’re using. Click Select device and choose the device you’re using. Click Generate. Follow the instructions to enter the App password (the 16 character code in the yellow bar) on your device. Click Done.
Once you are finished, you won’t see that App password code again. However, you will see a list of apps and devices you’ve created App passwords for.
Create a mail script in /home/pi:
cd /home/pi/ sudo nano mailIP
Paste the following (repalce YOURMAIL with full email address of where you want the email sent i.e. [email protected]):
#!/bin/sh
mailreceiver=YOURMAIL
today=$(date)
#my_ip=`ifconfig | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{print $1}'`
my_ip=`wget -q -O - checkip.dyndns.org|sed -e 's/.*Current IP Address: //' -e 's/<.*$//'`
my_pi="Domoticz RaspberryPi has rebooted! "
message="Your Pi has rebooted at $today. Current IP address = $my_ip"
echo $message > message.txt
mutt -s "${my_pi}" ${mailreceiver} < message.txt && rm message.txt
The commented line fetches the internal ip, example fetches external ip.
Make sure the mailIP can be executed:
sudo chmod +x mailIP
Test the script by running it:
./mailIP
Setup rc.local to send the mail at each reboot: Edit /etc/rc.local:
sudo nano /etc/rc.local
Add this above the exit 0 line:
sudo /home/pi/mailIP &
Make sure the rc.local can be executed:
sudo chmod 0755 /etc/rc.local
sudo bash cp /home/pi/.muttrc /root
sudo nano /etc/watchdog.conf
Uncomment the lines file and change and set them to:
file = /tmp/domoticz.log change = 300
This setting will restart the pi when domoticz.log hasn't been updated in 5 minutes, the time is in seconds (tested).
Be sure to remember this when stopping the domoticz service by hand!
and for new system , that do nothing yet, you can prevent unwanted reboot by adding a script like this :
cd /home/pi/domoticz/scripts/lua nano script_time_domotizAlive.lua
commandArray = {}
print('Domoticz alive !')
return commandArray
It will update the log every minute.
Start the watchdog daemon
sudo service watchdog start