raspberry-pi-scripts

Things I do often on a Raspberry Pi.

Updates

sudo apt update
sudo apt upgrade -y

sudo apt install build-essential git curl

hostname -I # show this pi's hostname.

PIP

sudo apt-get install python3-pip -y

UFW (Uncomplicated Firewall)

Uncomplicated Firewall is a program for managing a netfilter firewall designed to be easy to use. It uses a command-line interface consisting of a small number of simple commands, and uses iptables for configuration.

sudo apt install ufw -y
sudo ufw enable
sudo ufw status

To disable it:

sudo ufw disable

In ufw, allow port 1883 for mqtt. Also allow ssh:

sudo ufw allow 1883/tcp
sudo ufw allow OpenSSH

MQTT (Message Queue Telemetry Transport)

MQTT is a lightweight, publish-subscribe network protocol that transports messages between devices.

sudo apt install mosquitto -y
sudo apt install mosquitto-clients

Check the status:

sudo systemctl status mosquitto # looking for 'active (running)'

Note: you will probably have to open a hole in the firewall for port 1883. See example of that in UFW section

Redis

Redis is an in-memory data structure store, used as a distributed, in-memory key–value database, cache and message broker, with optional durability.

sudo apt install redis-server -y

Configuration file at

sudo nano /etc/redis/redis.conf

In the config file change the following:

• From: # bind 127.0.0.1
• To: bind 0.0.0.0

--

• From: protected-mode yes
• To: protected-mode no

--

• From: # requirepass foobared
• To: requirepass [your password here]

Finally, restart the instance:

sudo /etc/init.d/redis-server restart

To test you can use this simple python script:

redis-test-script.py

import redis # pip install redis
client = redis.Redis(host='[hostname here]', port=6379, password='[password here]')

# inspect the client object with:
# dir(client)

# set the key and value:
client.set('language', 'python')
print(client.get('language')) # returns: 'python'

Node-RED

Node-RED is a programming tool for wiring together hardware devices, APIs and online services.

bash <(curl -sL https://github.com/raw/node-red/linux-installers/master/deb/update-nodejs-and-nodered)

Note: The shortcuts were not created. But, you can start and stop the service from command lines using /usr/bin/node-red start and /usr/bin/node-red stop.

To run as a service:

sudo systemctl enable nodered.service

To disable this service:

sudo systemctl disable nodered.service

ssh

ssh-keygen

eval $(ssh-agent)
ssh-add

By-the-Way

Since I am new to all of this, I am making note of things that seem important.... :-)

Logs location: /var/log Running processes: ps -aux