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World Thinking Day 2014 Arch Linux for ARM Image Release

Two Raspberry Pi images, ArchLinuxARM-2014.02.08-rpi-base08G.zip and ArchLinuxARM-2014.02.22-rpi-twm08G.zip, have been uploaded to Rubus. These are compressed 8GB SDHC card binary images. They were compressed with Info-ZIP version 3 on Ubuntu 13.10.

Usage

To use either one, download the zip file, unzip it, and use your tool of choice to copy the image to the card.

Because I use Ubuntu I use dd. For example, I would type, in the folder where the uncompressed image (.img) file is located:

sudo dd if=./ArchLinuxARM-2014.02-rpi-twm08G.img of=/dev/sdb bs=1M

to copy the uncompressed TWM image to the card, which just happens to be /dev/sdb on my Ubuntu system.

Current Images

The latest Raspberry Pi image files are:

• ArchLinuxARM-2014.02.08-rpi-base08G.zip is the base R-Pi 8GB image without TWM.
• ArchLinuxARM-2014.02.22-rpi-twm08G.zip is the base R-Pi 8GB image with the TWM graphic desktop environment.

Both images have the following accounts:
root: username root, password root
pi: username pi, password pi

Account root can only log into the Raspberry Pi at the console. Account pi can log into the Raspberry Pi at the console and remotely via ssh.

User pi is part of the wheel group. It is configured to sudo without needing to enter its password. Make sure to change pi's sudo privileges in the /etc/sudoers file and change the default passwords if you plan to use this on a network you do not control.

Security

Starting with the 22 TWM February release, the following security policies are in place:

• root cannot log in remotely via ssh, only at the console
• iptables firewall is enabled, with the following policies
  • All ports are blocked except 22 (ssh/scp), 80, and 8080
  • Port 80 is redirected to port 8080

In the future more security features will be enabled.

Note that the base image has none of these restrictions.

Special Features

• The TWM-labeled image has the TWM X Windowing system installed. To start it, log into pi and type startx at the prompt.
• The TWM-labeled image has node.js installed. Key modules installed are
  • i2c and onoff to manipulate I2C and GPIO, respectively, on the Raspberry Pi. You must sudo to use these features.
  • Express and jade to create web applications. And example is in the directory express.jade. cd into this directory, then type 'node app.js' to start the web app. Determine what the IP address is of your Raspberry Pi via ifconfig. Then, on an external computer on the same network as the R-Pi, type '[ip address]' into the browser's address bar to bring up the web app running on the R-Pi.

Target System

These images were built to run on the Raspberry Pi Model B Revision 1 board.