Step-by-Step: Setting Up Pi-hole on Your Raspberry Pi Zero 2 W

Pi-hole is a network-wide ad blocker that acts as a DNS sinkhole. It improves browsing speed and security by blocking unwanted content before it reaches your devices. This guide will walk you through setting up Pi-hole on a Raspberry Pi Zero 2 W.

What You’ll Need

• Raspberry Pi Zero 2 W
• MicroSD card (8GB or larger)
• MicroSD card reader
• Micro-USB power supply
• USB-to-Ethernet adapter or a stable Wi-Fi connection
• Case for your Raspberry Pi (optional)
• A computer with internet access

Step 1: Prepare the MicroSD Card

1. Download Raspberry Pi OS Lite
   Go to the Raspberry Pi website and download the Lite version.
2. Flash the OS
   Use software like Raspberry Pi Imager or balenaEtcher to flash the OS onto your MicroSD card.
3. Enable SSH (Optional)
   After flashing, create a file named ssh (no extension) in the /boot directory of the MicroSD card to enable SSH.
4. Configure Wi-Fi (Optional)
   Create a file named wpa_supplicant.conf in the /boot directory and add the following:

   country=US
   ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
   update_config=1
   network={
       ssid="Your_WiFi_SSID"
       psk="Your_WiFi_Password"
   }

   Replace Your_WiFi_SSID and Your_WiFi_Password with your network credentials.

Step 2: Boot the Raspberry Pi

1. Insert the MicroSD card into your Pi Zero 2 W and power it on.
2. Connect to the Raspberry Pi via SSH using its IP address. On a Linux/Mac terminal or Windows PowerShell, type:

   ssh pi@<IP_ADDRESS>

   The default username is pi, and the password is raspberry.

Step 3: Update the System

Run the following commands to update your system:

sudo apt update && sudo apt upgrade -y

Step 4: Install Pi-hole

1. Install Pi-hole using the one-step automated script:

   curl -sSL https://install.pi-hole.net | bash

2. Follow the prompts:
   1. Select your preferred upstream DNS provider (e.g., Google, OpenDNS).
   2. Set a static IP address for the Pi-hole.
   3. Enable or disable the web interface and logs as needed.
3. Note the admin interface password displayed at the end of the installation.

Step 5: Configure Router DNS

1. Log in to your router’s admin interface.
2. Set the Raspberry Pi’s IP address as the primary DNS server.

Step 6: Access Pi-hole Dashboard

Open a browser and navigate to http://<Pi_IP_Address>/admin. Log in with the admin password.

Step 7: Optimize Pi-hole

1. Add blocklists for better ad blocking. Go to Settings > Blocklists and add more lists like The Big Blocklist Collection.
2. Use the Pi-hole Query Log to whitelist/blacklist domains as needed.

Optional: Add a Pi-hole Monitor

Use a small OLED display to monitor Pi-hole statistics directly on the Pi Zero 2 W. A guide for this could be a follow-up project!

Conclusion

Your Raspberry Pi Zero 2 W is now a dedicated ad-blocking powerhouse! Enjoy faster browsing and enhanced privacy across your entire network.