I turned an old Android phone into a server for my LAN - here's how and why

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Termux makes it easy to get a Linux terminal emulator on Android.
With Termux, you can turn your phone into a server.
Termux is free to install from F-Droid.

I often adapt old phones and tablets for uses other than their intended purpose. Usually, it's just for fun; sometimes there's a method to my madness. Over the weekend, I decided to try turning a phone that had been resting silently in a drawer into a server…specifically, a Linux server.

That's right. I wanted to see what I could do with Apache and a few other bits and pieces. In the end, I wound up with a fun little website as a test, and now I'm going to show you how I did it.

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It starts with Termux.

What is Termux?

Termux is a free, open-source Linux terminal emulator that lets you run a Linux environment on Android. It's not exactly a 1:1, perfectly binary-compatible match (there are some permissions issues and a few other quirks that prevent it from behaving exactly like a true Linux distribution), but it's close enough.

You can install Termux from the Google Play Store, but don't. The version available on the Play Store is out of date. Instead, you need to install F-Droid (download the APK from the F-Droid site and then sideload it), and then install Termux from within that app.

Also: How I converted my Android phone into the perfect bedside clock - and why it makes sense

Once it's installed, you'll find yourself at a Linux terminal, where you can begin setting up your server.

Installing the necessary packages

What you install will depend on what you want to serve up. Let me walk you through the process of getting an Apache server up and running along with a basic PHP-based website.

The first thing you need to do is update the software within the emulator. To do that, issue the command:

pkg update

Instead of typing everything from your phone, you can install SSH and then remote into it from a desktop (so you can type on a regular keyboard). To do that, issue the command:

pkg install openssh

To find the IP address of your Termux environment, issue the command:

ifconfig

Next, you need to find your username with the command whoami. You can then set a password (that you'll use for SSH) with the command:

passwd

Start the SSH server with the command:

sshd

Open a terminal window on a Linux or MacOS machine (or a Windows machine with SSH installed) and connect with the command:

ssh USER@IP:8022

Where USER is your username, and IP is the Termux IP address.

Install the necessary components for the LAMP server (as well as git and wget) with the command:

pkg install apache2 php php-fpm mariadb git wget

You can now start the Apache server with the command:

apachectl start

Open a web browser on your network and point it to http://IP:8080 (where IP is the IP address of your Termux environment). You should see "It works!" printed on the page.

Create a site

At this point, you can either start building a website from scratch or download a sample site, such as one of the ones I found from this collection of PHP sample sites. If you're going the PHP route, you'll need to start the PHP server with the command:

php-fpm

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You can download one of the sample sites into the Apache document root and test it out. To do that, change into the Apache document root with the command:

cd /$PREFIX/share/apache2/default-site/htdocs

You can use git to clone one of the sample sites with:

git clone https://github.com/amoldalwai/E-learning-Website.git

If you're demoing the E-Learning site, rename it with the command:

mv E-learning-Website learning

Point your web browser to http://IP:8080/learning/home.php (again, where IP is the IP address of your Termux server), and the site will appear.

Also: How to run Android apps on Linux

You now have a working website running on a spare Android phone. Get creative with it: There are all kinds of experiments you can do, such as installing a Nextcloud server, a database development server, a CMS, or even (if you want to get really complicated) a home automation server.

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