To celebrate Halloween I’ve decided to put together a guide that will show you how to install Raspbian Jessie, the (as of this writing) most current version of the Debian operating system for the Raspberry Pi. The biggest difference between this guide and the hundreds if not thousands of other guides out there on the web is that this guide will teach you to set up your Raspberry Pi without a dedicated monitor or TV (or headless mode). You’ll control everything from another computer that will access the RPi over the network, and it’s fairly straightforward. In my opinion this is the easiest way to set up a Raspberry Pi, and it’s coincidentally very similar to how much larger servers are configured in a data center environment.
I’ve taken the liberty of testing this procedure on all of the following models of the Raspberry Pi, so your mileage should not vary, as these are the most commonly found variants of the RPi:
- Raspberry Pi Model B w/ 256MB RAM (2012)
- Raspberry Pi Model B w/ 512MB RAM (2014)
- Raspberry Pi 2 Model B w/ 1GB RAM (2015)
By the time we’re finished, we’ll have a network-accessible Raspberry Pi running Raspian Jessie.
Downloading Raspbian Jessie
To prepare, we’ll download the image that we’ll then install to the SD card which will be inserted into the Raspberry Pi. If you’re comfortable downloading torrents, you can use this torrent link to download the .zip quite fast.
If you’re prefer to download it in a more traditional way, you can run the following command from your Mac:
cd ~/Downloads && curl -O https://downloads.raspberrypi.org/raspbian/images/raspbian-2015-09-28/2015-09-24-raspbian-jessie.zip
Once we’ve downloaded Raspbian Jessie, we’ll need to unzip it. People have been having a ton of trouble with this producing a cpgz file due to a bug in OS X that prevents OS X from unzipping some files over 4GB. Here’s how to unzip
2015-09-24-raspbian-jessie.zip and end up with the intended file,
2015-09-24-raspbian-jessie.img, from the terminal:
tar -xvf 2015-09-24-raspbian-jessie.zip
This leaves us with
2015-09-24-raspbian-jessie.img. It should be located at
~/Downloads/2015-09-24-raspbian-jessie.img. Now it’s time to copy this image to the SD card.
Preparing the SD Card
The first step in preparing the SD card is to insert it into the Mac. Some Macs have a slot for this, others don’t (in this case an SD to USB adapter will do the trick).
Once the SD card is inserted, we can open a terminal and run the
df -h command. This command will list all mounted disks in the Mac, including the newly inserted SD card, and should produce something similar to the following output:
$ df -h Filesystem Size Used Avail Capacity iused ifree %iused Mounted on /dev/disk1 465Gi 231Gi 234Gi 50% 60591774 61251936 50% / devfs 187Ki 187Ki 0Bi 100% 648 0 100% /dev map -hosts 0Bi 0Bi 0Bi 100% 0 0 100% /net map auto_home 0Bi 0Bi 0Bi 100% 0 0 100% /home /dev/disk2s1 0Mi 0Mi 32Gi 0% 0 0 100% /Volumes/UNTITLED
/Volumes/UNTITLED here is showing up as
/dev/disk2s1. This filesystem identifier will be different on every system, so it’s important not to just copy and paste the identifier shown in the example above. This is the SD card. The next step is to
unmount it using the
sudo diskutil unmount /dev/disk2s1 command, which will prompt for our OS X password and produce output similar to the following:
$ sudo diskutil unmount /dev/disk2s1 Password: Volume boot on disk2s1 unmounted
Now that the disk is unmounted, we can use the
dd command to copy our Raspbian Jessie image to it. This will look something like the following (and it will take a few minutes to complete, so don’t panic!). Also, notice
/dev/rdisk2 is used here instead of
/dev/disk2s1. If your disk is labeled something like
/dev/disk3s1, you would use
$ sudo dd bs=1m if=~/Downloads/2015-09-24-raspbian-jessie.img of=/dev/rdisk2 4125+0 records in 4125+0 records out 4325376000 bytes transferred in 211.177442 secs (20482188 bytes/sec)
The final step is to eject the SD card. This is more of a figurative action than a literal one, as it won’t actually eject from the Mac. Essentially, this disconnects the SD from the Mac so that it can be safely removed, and it’s done as follows:
sudo diskutil eject /dev/rdisk2 Password: Disk /dev/rdisk2 ejected
The SD card is now prepared for use with the Raspberry Pi. Next, we’ll use it to set up the Raspberry Pi.
Plugging In and Powering Up
At this point we’re ready to start plugging things in. There is an order of operations that we should follow here (power should be last):
- Insert the SD card into the Raspberry Pi.
- Plug an ethernet cable from the router to the Raspberry Pi.
- Plug power (provided via micro USB) into the Raspberry Pi.
Power will be provided as soon as it’s plugged in, and after approximately a minute, the Raspberry Pi will have completely booted up. At this point it should have been automatically assigned an IP from the router, which is probably running DHCP (as most home routers do).
To access the Raspberry Pi, we’ll need to get the IP address it has been assigned. This might be very simple. We can try to run
arp -a from our Mac to get a list of devices on our local network, as follows:
$ arp -a router.smalleycreative.local (192.168.1.1) at 4c:8d:79:03:bc:ad on en0 ifscope [ethernet] raspberrypi.smalleycreative.local (192.168.1.89) at b8:27:eb:91:2a:df on en0 ifscope [ethernet] ...
It is very clear from this output that the Raspberry Pi has an IP address of 192.168.1.89. SSH is running on this Raspberry Pi, so it can be accessed at 192.168.1.89 (the password is raspberry):
$ ssh firstname.lastname@example.org The authenticity of host '192.168.1.89 (192.168.1.89)' can't be established. RSA key fingerprint is 52:16:ad:8a:12:7b:f4:84:1a:8e:3e:0f:e1:a3:3b:5e. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '192.168.1.89' (RSA) to the list of known hosts. email@example.com's password: The programs included with the Debian GNU/Linux system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. Last login: Thu Sep 24 15:33:03 2015
At this point it’s time to expand the filesystem. This just ensures that all of the SD card storage is available to the Raspbian OS. To do this, run
raspi-config, and select
pi@raspberrypi ~ $ raspi-config
Once this is done, we select
Finish, and agree to reboot the Raspberry Pi.
At this point it is a good idea to rerun
raspi-config to set a user password that is different than the default password of
raspberry. Better yet, configure public key authentication, which eschews the use of passwords for key-based authentication, which is much more secure. Official instructions on how to do that are provided over at raspberrypi.org.