Jul 13 2013 0

Raspberry Pi Setup

Yesterday I got my Raspberry Pi and this post serves as reference for myself for whenever I need to setup a new SD card for it.

Creating SD card for Raspberry Pi

Download latest image from http://www.raspberrypi.org/downloads. In my case I have chosen Raspbian wheezy”

Checksum validation

Check to see if the download package has not been tampered with

Thoth:Raspberry Pi fmeus$ shasum 2013-05-25-wheezy-raspbian.zip
131f2810b1871a032dd6d1482dfba10964b43bd2  2013-05-25-wheezy-raspbian.zip

Which matches the information presented on the Downloads page at http://www.raspberrypi.org/downloads

Determine device for SD card

df -h

Before inserting the SD card

Thoth:Raspberry Pi fmeus$ df -h
Filesystem      Size   Used  Avail Capacity   iused     ifree %iused  Mounted on
/dev/disk0s2   734Gi  573Gi  160Gi    79% 150402219  41885801   78%   /
devfs          189Ki  189Ki    0Bi   100%       654         0  100%   /dev
/dev/disk1s2   931Gi  549Gi  382Gi    59% 144002013 100104652   59%   /Volumes/Iomega 1TB HDD
map -hosts       0Bi    0Bi    0Bi   100%         0         0  100%   /net
map auto_home    0Bi    0Bi    0Bi   100%         0         0  100%   /home
/dev/disk0s4   197Gi   26Gi  171Gi    14%     92997 179040039    0%   /Volumes/BOOTCAMP

After inserting the SD card

Thoth:Raspberry Pi fmeus$ df -h
Filesystem      Size   Used  Avail Capacity   iused     ifree %iused  Mounted on
/dev/disk0s2   734Gi  573Gi  160Gi    79% 150402219  41885801   78%   /
devfs          189Ki  189Ki    0Bi   100%       654         0  100%   /dev
/dev/disk1s2   931Gi  549Gi  382Gi    59% 144002013 100104652   59%   /Volumes/Iomega 1TB HDD
map -hosts       0Bi    0Bi    0Bi   100%         0         0  100%   /net
map auto_home    0Bi    0Bi    0Bi   100%         0         0  100%   /home
/dev/disk0s4   197Gi   26Gi  171Gi    14%     92997 179040039    0%   /Volumes/BOOTCAMP
/dev/disk2s1   7.4Gi  2.1Mi  7.4Gi     1%         0         0  100%   /Volumes/NO NAME

My fresh out of the box 8GB SD card

/dev/disk2s1   7.4Gi  2.1Mi  7.4Gi     1%         0         0  100%   /Volumes/NO NAME

For the next steps we will be using the device as a RAW device, so we drop s1 from its name and put an r in front of it, so we get /dev/rdisk2

Unmount SD card volume

Thoth:Raspberry Pi fmeus$ diskutil unmount /dev/disk2s1
Volume NO NAME on disk2s1 unmounted

Copy Debian image to SD card

Raw device name : /dev/rdisk2

Sections from the manpage for dd

bs=n - Set both input and output block size to n bytes, superseding the ibs and obs operands. If no conversion values other than noerror, notrunc or sync are specified, then each input block is copied to the output as a single block without any aggregation of short blocks.

if=file - Read input from file instead of the standard input.

of=file - Write output to file instead of the standard output. Any regular output file is truncated unless the notrunc conversion value is specified. If an initial portion of the output file is seeked past (see the oseek operand), the output file is truncated at that point.

Thoth:Raspberry Pi fmeus$ sudo dd if=2013-05-25-wheezy-raspbian.img of=/dev/rdisk2 bs=1m
Password:
1850+0 records in
1850+0 records out
1939865600 bytes transferred in 167.931297 secs (11551543 bytes/sec)

There is now a 2GB boot partition and 6GB of unallocated (wasted) space on the SD Card. Next step is reclaiming that unallocated disk space.

Expanding the filesystem

For this step we need to boot the Raspberry Pi. You will either on start-up be presented with the configuration tool. If this is not the case issue the following command from the terminal window to start the configuration tool

sudo raspi-config

Run the first option in the menu Expand Filesystem’ (Using 2013-05-25-wheezy-raspbian), the the apt description Ensures that all of the SD card storage us available to the OS.

The next time you boot your Raspberry Pi it will have access to the complete SD card

Installing some additional software

Install Chromium browser
sudo apt-get install chromium-browser

Might be a good idea to disable the Flash plug-in (if installed, wasn’t the case in my installation)

enter chrome://plugins in the omnibox (search bar) and disable the flash plugin

Install vncserver

To install Tight VNC server, issue the following command

sudo apt-get install tightvncserver

Next issue the following command to start the VNC server

vncserver :0 -geometry 1280x800 -depth 24

To have the VNC server start-up automatically follow the instructions posted here. I followed these instructions, with two exceptions I used :0 instead of :1 (this was it was easier to access the Pi from my Mac) and instead of

su root -c 'vncserver :1 -geometry 1280x800 -depth 24'

I used the following. This way when connecting to the desktop it will run under the use pi instead of the root user

vncserver :0 -geometry 1280x800 -depth 24

Access your Raspberry Pi by hostname

By default to ssh into the raspberry pi you need to use its IP address. If you are using DHCP you would have to lookup its IP address every time. By installing Avahi you will be able to connect to your Raspberry Pi using its assigned hostname

sudo apt-get install avahi-daemon

Creating backup

Very similar to the process for creating the bootable SD card.

sudo dd if=/dev/rdisk2 of=/Users/fmeus/2013-05-25-wheezy-raspbian-modified.img bs=1m

NOTE: If the backup is created after running Expand filesystem’, you can only restore backup image to a SD card of similar size or larger. In my case the backup image was 7948206080 bytes large (approx. 8GB)

Useful commands

Shutting down

sudo halt

or

sudo shutdown -h now

Rebooting

sudo reboot

or

sudo shutdown -r now

Updating installed packages

Synchronize the packages index files from their sources

sudo apt-get update

Install the latest versions of all packages installed on the system

sudo apt-get upgrade

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