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Raspberry Pi OS imaging headless SSH setup hostname configuration package updates systemd service basics journalctl logs environment variables Python virtual environment
GPIO Digital I/O
GPIO pin numbering digital output LED digital input button pull-up resistor button debounce PWM LED brightness GPIO cleanup edge detection
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I2C device scan I2C sensor read SPI overview SPI transfer UART serial read 1-Wire temperature sensor ADC via external chip sensor calibration
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cron scheduled task systemd autostart app camera capture filesystem data logging MQTT publish MQTT subscribe HTTP sensor endpoint local SQLite logging
Networking & Services
static IP concept mDNS hostname Wi-Fi configuration SSH key authentication SFTP file transfer Nginx reverse proxy firewall with ufw network diagnostics
Hardware Projects
servo control ultrasonic distance sensor relay module safety RGB LED mixing buzzer tone PIR motion sensor rotary encoder safe shutdown button
Raspberry Pi / Networking & Services

firewall with ufw

Learn firewall with ufw in Raspberry Pi with a dedicated explanation, a concept-specific example, practical cautions, and a mastery check.

12 min read • Advanced
raspberry-pi-039.sh
bash 
sudo ufw default deny incoming
sudo ufw allow 22/tcp
sudo ufw allow 80/tcp
sudo ufw enable
sudo ufw status verbose
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Original Syntaxis Content · Original Syntaxis Content

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