How to Turn a Raspberry Pi Zero W into a Mini Web Server – Step‑by‑Step Guide

Introduction

The author discovered the Raspberry Pi and decided to document the entire process of turning a Raspberry Pi Zero W into a functional mini web server.

What Is a Raspberry Pi?

Raspberry Pi (RPi) is a credit‑card‑sized Linux‑based micro‑computer, popular among hobbyists. The Zero W model is a miniature version, about one‑third the size of a 3B+, with a 1 GHz single‑core CPU, 512 MB RAM, Wi‑Fi/Bluetooth, HDMI, USB, GPIO, and micro‑SD storage.

Zero W Specifications

BCM2835 processor, 1 GHz, 512 MB RAM

BCM43438 Wi‑Fi / BT chip

Micro‑USB power and OTG ports

Mini‑HDMI port

Composite video and reset pins

CSI camera connector

Micro‑SD slot for OS

40‑pin GPIO header

Dimensions: 65 mm × 30 mm

Installing the OS on Zero W

1. Preparation

Required items: a 16 GB or 32 GB SanDisk micro‑SD card, a standard USB‑type‑A cable, SDFormatter, Win32DiskImager, and the Raspbian Stretch Lite image.

2. Download the Image

Download the official Raspbian Stretch Lite zip (≈360 MB), unzip it to obtain a .img file (~1.7 GB).

3. Write Image to SD Card

Insert the SD card, open Win32DiskImager, select the .img file, choose the correct device, and click “Write”.

Note: If using a third‑party image, the extracted file may not be an .img; handle accordingly.

4. Configure Boot Partition

4.1 Create an empty ssh file

In the boot partition, create a file named ssh with no extension and no content to enable SSH on first boot.

4.2 Create wpa_supplicant.conf

Add the following to the file (replace with your Wi‑Fi SSID and password):

country=CN
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
    ssid="your_wifi_name"
    psk="your_wifi_password"
}

5. Assemble and Power Up

Insert the prepared SD card into the Zero W, connect power via the USB cable, and wait for the LED to become steady. Locate the device’s IP address on your router (e.g., 192.168.0.104).

6. Connect via SSH

Use an SSH client (e.g., PuTTY) to log in with username pi and password raspberry.

7. Optimize the System

7.1 Change APT Sources

Replace the default sources with a domestic mirror (e.g., USTC):

sudo nano /etc/apt/sources.list
# comment existing lines
deb http://mirrors.ustc.edu.cn/raspbian/raspbian/raspbian stretch main contrib non-free rpi

sudo nano /etc/apt/sources.list.d/raspi.list
# comment existing lines
deb http://mirrors.ustc.edu.cn/archive.raspberrypi.org/debian stretch main ui

sudo apt-get update
sudo apt-get upgrade

7.2 Set Timezone

sudo dpkg-reconfigure tzdata

Select “Asia → Shanghai”.

7.3 Enable SSH on Boot

Method 1: sudo raspi-config → Interfacing Options → SSH → Enable.

Method 2: Add /etc/init.d/ssh start before exit 0 in /etc/rc.local.

8. Install Nginx

# Install
sudo apt-get install nginx
# Start
sudo /etc/init.d/nginx start
# Restart
sudo /etc/init.d/nginx restart
# Stop
sudo /etc/init.d/nginx stop

Access http://192.168.0.104 to verify the web server.

9. Expose the Server to the Internet (Port‑Forwarding)

Use a tunneling tool such as ngrok, frp, or domestic alternatives (ittun, sunny, natapp). The author uses the ngrok_arm binary from ittun.

Run ngrok in a screen session to keep it alive, and consider adding it to startup scripts for persistence.

Tip: On Android, you can use the “android terminal” app and run ip neigh to discover device IPs when using a phone hotspot.

Conclusion

The Raspberry Pi Zero W, despite its modest hardware, can comfortably host a small website, run Nginx, and be accessed remotely via ngrok, making it an excellent low‑cost platform for learning Linux, networking, and web services.