ESP2866-01 Wiring

 Some ESP8266-01 Boards need the Ping CH_PD pulled, high, otherwise it is in rest mode.

Pulled high means putting a 10kOhm resistor between CH_PD and VCC.

Tasmota Time settings

 ntpserver1 yourntpgoeshere

Germany: Timezone 99

https://tasmota.github.io/docs/Commands/

ESP8266 via MQTT Iobroker

 https://www.smarthome-tricks.de/allgemein/nodemcu-esp8266-sensoren-an-iobroker-ueber-mqtt/

https://www.smarthome-tricks.de/esp8266/pubsubclient-fuer-mqtt-mit-benutzername-passwort-und-port/

https://github.com/knolleary/pubsubclient

Grafana View Collection

 Internet Connection View:

https://www.smarthome-tricks.de/grafana/5-3-grafana-dashboard-fuer-die-internet-geschwindigkeit/

Information on Linux systems live

 Process overview: top, htop, nmon

Disk/read/write: iotop -o -b -d 10

Beware ! Minecraft Windows 10 Edition from Microsoft store

 To my knowledge there is no satisfactory solution to share a Minecraft Win 10 licence from MS Store on a Win10 Computer among different users with differen MS Store accounts.

No App Sharing as known from Apple or Google possible. 

The MS Solution is to buy the licence X-Times!

Not Cool!

Granting Access for non Root to GPIOs

https://stackoverflow.com/questions/30938991/access-gpio-sys-class-gpio-as-non-root

Anleitung dafür Rechte auf GPIOs zu setzen aus:

http://www.netzmafia.de/skripten/hardware/RasPi/RasPi_GPIO_Shell.html

Datei:

# /etc/udev/rules.d/80-gpio-noroot.rules

# Zugriff auf GPIO ohne root-Rechte ermoeglichen

#

# Gruppe aendern

SUBSYSTEM=="gpio", RUN+="/bin/chown -R root.gpio /sys/class/gpio"

SUBSYSTEM=="gpio", RUN+="/bin/chown -R root.gpio /sys/devices/virtual/gpio"

# Sticky-Bit setzen

SUBSYSTEM=="gpio", RUN+="/bin/chmod g+s /sys/class/gpio"

SUBSYSTEM=="gpio", RUN+="/bin/chmod g+s /sys/devices/virtual/gpio"

# Zugriffsrechte setzen

SUBSYSTEM=="gpio", RUN+="/bin/chmod -R ug+rw /sys/class/gpio"

SUBSYSTEM=="gpio", RUN+="/bin/chmod -R ug+rw /sys/devices/virtual/gpio"

#Jetzt müssen Sie nur noch den udev-Daemon von den Änderungen wissen lassen (beim nächsten Reboot passiert das dann automatisch):

sudo service udev restart

sudo udevadm trigger --subsystem-match=gpio

Iobroker zur Gruppe gpios hinzufügen:

sudo usermod -aG gpio iobroker

Nun ist folgendes passiert: 

Die Rechte auf die GPios wurden auf die Gruppe GPIO erweitert.

Dies wird bei jedem Boot wiederholt.

Der Nutzer Iobroker wurde dieser Gruppe hinzugefügt und kann nach einem Neustart nun die GPios schalten.

Ubuntu Blocking Packages from update

 https://askubuntu.com/questions/18654/how-to-prevent-updating-of-a-specific-package

dpkg

Put a package on hold:

echo "<package-name> hold" | sudo dpkg --set-selections

Remove the hold:

echo "<package-name> install" | sudo dpkg --set-selections

Display the status of your packages:

dpkg --get-selections

apt
Hold a package:
sudo apt-mark hold <package-name>
Remove the hold:
sudo apt-mark unhold <package-name>
Show all packages on hold:
sudo apt-mark showhold

postfix for raspi info

 I just installed Postfix on multiple raspis to be informed about updates, problems etc.

Any suggestions on how this could be done easier by e.g. collecting would be very much appreciated.

I started of with:

sudo apt install postfix:

• Setup as satellite machine
• Hostname unchanged
• Relay or smarthost: put in your smtp
• Everythin else default.

After that I've updated my /etc/aliases to reroute everything towards root and then towards my external mail adress:

postmaster:    root

nagios: root

root: admin@yourdomain.com

in the postfix Config file: /etc/postfix/main.cf I added:

smtp_sasl_auth_enable = yes

smtp_sasl_security_options = noanonymous

smtp_sasl_password_maps = hash:/etc/postfix/sasl_password

sender_canonical_maps = hash:/etc/postfix/sender_canonical

smtp_tls_security_level = encrypt

The  meaning of sender_canonical  is not clear as it seems redundant to the aliases:

www-data admin@yourdomain.com

root admin@yourdomain.com

the sasl_password file needs the input of your external relay or smarthost:

smtpserver:25  user:password

Be sure, the file ist only readable by its owner.

now:

sudo newalias    --> gets the aliases updated

 sudo postmap hash:/etc/postfix/sasl_password  && sudo postmap /etc/postfix/sender_canonical --> gets the files merged into postfix

sudo systemctl restart postfix -->  start with new config

If everything works you should be able to do this:

echo Hello!  Test! | mail -s Testmail admin@yourdomain.com

If it does not work due to the encryption or auth because missing Mech:

https://serverfault.com/questions/1008119/postfix-error-sasl-authentication-failed-cannot-authenticate-to-server-no-mec

try to install:

apt install libsasl2-modules

Nagios

Nagios installed following ....

Systems under surveillance need:

 sudo apt-get install nagios-nrpe-server nagios-plugins

 

nagios extension:

https://community.spiceworks.com/topic/275519-how-do-i-install-a-perl-script-into-nagios