March 02, 2017 Guillaume Renouvin 5 min read

A Raspberry Pi is a low cost, small single-board computer.

It allows you to develop your own projects and let them run all day on this mini computer.

Possibilities are endless: home automation, Internet of Things,

robotics projects, or run your own router, seedbox, NAS, ...

You can also use it as inexpensive project server.

But let's start from the beginning!

In this article, I will show you how easy it is to install a Raspberry Pi headless

from scratch (meaning that you won't need another monitor, keyboard,

mouse than the ones of your computer) so you will 'only' have to type your code

from your pc and launch your server via ssh.

If you don't own a Raspberry Pi yet, maybe I'll make you want to buy one!

Prerequisites

Of course this tutorial require some stuff to work with:

A Raspberry Pi, obviously

An ethernet cable

A battery

An SD card

Your computer

This can all be bought for around 50-80€ on amazon or thePihut.

Install raspbian on your SD card

As any computer, your Raspberry Pi will need an operating system to work with.

First, download Raspbian on their official page.

Raspbian is a free OS based on Debian optimized for the Raspberry Pi architecture.

It contains the set of basic programs and utilities that make your Raspberry Pi run.

Plug your SD card and find the disk where it is mount on your computer with

diskutil list with macOS or df -h on Linux.

Unmount the disk and copy the OS on your SD card.

For Mac:

diskutil unmountDisk /dev/ < disk where your SD card is mounted >

or, for Linux:

umount /dev/sdd1

Then write the image to the card with

sudo dd bs = 1m if = < your .img file > of = /dev/rdisk < disk where your SD card is mount >

Raspbian is now your Raspberry Pi new OS!

Raspberry Pi doesn't have ssh activated by default.

You can (and should) authorize ssh by adding an empty file named ssh at boot directory

cd < SD card directory > && touch ssh

First connection

Now, let's connect to your Raspberry Pi for the first time.

First, you will need to find your Raspberry Pi ip.

Find your computer ip address on the network and the subnet mask with

ifconfig | grep 'inet '

This will display your network interfaces ips (which should look like '192.168.....') and netmasks (for example if your netmask is 0xffffff00 your subnet mask is 24).

Then find your Raspberry Pi ip

sudo nmap -sP < Computer IP address > / < Subnet mask > | awk '/^Nmap/{ip= $NF }/B8:27:EB/{print ip}'

This will return the ip of your Raspberry Pi by checking all ip addresses of your local network, find the one of your Pi, and print it.

You can now connect with ssh to your Pi:

The initial user is Pi and the password is raspberry :

ssh pi@ < IP >

You can edit your default configuration with raspi-config :

On your first connection, you should also upgrade your packages with

sudo apt update sudo apt dist-upgrade

and modify your root password with sudo passwd

Authorize your ssh key to connect without password

If you don't want to fill your password each time you connect to your Pi, you can authorize your ssh key.

Follow this great github tutorial to generate a ssh key if needed.

Then log to your Pi and create a .ssh directory on your Pi if it doesn't exist

sudo su cd ~ install -d -m 700 ~/.ssh touch ~/.ssh/authorized_keys

Then add your public key (on your computer at ~/.ssh/id_rsa.pub) to your Raspberry Pi at the end of ~/.ssh/authorized_keys

Your first server on a Raspberry Pi

It's all set!

Now let's try your newly configurated Raspberry Pi with a minimal project to see if

everything works fine.

Let's try it with a NodeJS server.

First install NodeJS:

wget http://node-arm.herokuapp.com/node_latest_armhf.deb sudo dpkg -i node_latest_armhf.deb

Create a file server.js with those lines

var http = require ( 'http' ) ; var server = http . createServer ( function ( request , response ) { response . writeHead ( 200 , { "Content-Type" : "text/plain" } ) ; response . end ( "Hello World

" ) ; } ) ; server . listen ( 3000 ) ;

Run it with node server.js and go to http://\<IP>:3000/

You should be able to access to your first server hosted on a Raspberry Pi on your

local network.

Develop from your host machine

It's all very nice, but you will obviously not be working in ssh for a substantial project.

To work from your computer, you will need to mount your distant directory on your computer.

Luckily, this can easily be done with SSHFS.

SSHFS (or Secure shell file system) lets you share a file system securely using

SSH's SFTP protocol.

SSHFS is based on the FUSE file system that allows a user with no privileges to access a file system without having to modify the kernel sources.

No more theory, let's practice.

First, install SSHFS and FUSE (if you use a Mac, go to https://osxfuse.github.io/,

on Ubuntu/Debian sudo apt-get install sshfs ).

Then, create a directory on your computer and mount your Raspberry Pi project

directory on it with SSHFS

mkdir pi sshfs root@ < IP > : < Path of your project on your Pi > pi cd pi

You can now access your project directory directly from your computer and modify your files.

Don't forget to unmount the project when you are done:

umount tmp

Conclusion

You've just learnt how to configure a Raspberry PI from scratch headlessly, if you're

interesting on the project stay tuned for next article about how to use it for home automation !