Setting up a self signed SSL certificate with Apache

I’m assuming you have Apache installed.

Enable the SSL mod for apache:

Create a directory for the certificates:

Generate the certificate:

Openssl will ask for some information, make sure you set the FQDN properly, the rest don’t matter.

Now edit your virtualhost to point to port 443:

Add the port to the server name directive:

Then enable SSL and point the virtualhost at the certificates:

Save the file and restart Apache

Now if you want to redirect non-SSL requests to the SSL port add another virtualhost that looks like the following:

Then a2ensite the new virtualhost and restart Apache once more.

Spotify in Ubuntu 12.10

Spotify is a cool streaming music service – $12 a month for high quality music streams on mobile and desktop. They have a decent Linux client too:

Sounds like Spotify is being added to the Software Center soon anyway.

Optional extras:

http://www.webupd8.org/2013/01/download-ambiance-theme-for-spotify.html

http://code.google.com/p/spotify-notify/

Mucking About with Voxel.js

voxel_forest

Installing Voxel.js

I just discovered voxel.js, which is a web-based voxel engine that can be used to build block-based games like Minecraft. It’s written in node.js, so lets get that set up. Voxel.js requires node.js 0.8.0 or better, and Ubuntu’s repositories supply 0.6.19, so we need to set up a PPA to get the latest version.

Under Ubuntu 12.10 the node.js executable is name ‘nodejs’, I believe its ‘node’ on some other systems.

Grab the voxel hello world repo from github:

Now you should be able to check out voxel at localhost:8080. You will have be inside a crater with a couple of minecrafty types in front of you. They would be Maxogden and Substack, the voxel.js devs.

“npm install” downloads all the dependencies for voxel-hello-world. ‘npm start’ makes npm run a node js webserver, and rebuild index.js on each request using browservefy.

Note: I can only get this working in Firefox – according to Google Chrome doesn’t support WebGL with my laptop’s Nvidia FX Go5200 🙁

Switch to Perlin Noise Terrain Generation

Instead of using the predefined ‘Valley’ terrain, we can switch out to a module, such as the Perlin Noise Terrain Generator.

Add the following at the top of index.js as below:

Then update createGame:

You can muck around with the value of scaleFactor to make mountains, hills or relatively flat terrain.

Plant Some Trees

In order to generate some trees we need to include voxel-forest then add a few lines of code..

From here..

That’s probably enough for one post but jeez there’s a lot more here to play with so watch out for a followup.

BumbleBee drivers on Ubuntu 12.10

My ASUS laptop has 2 graphics cards, one Nvidia and the other Intel. Ubuntu uses the Intel one by default, but that leads to poor performance for gaming. So I need to install the Bumblebee drivers.

  1. sudo add-apt-repository ppa:bumblebee/stable
  2. sudo add-apt-repository ppa:ubuntu-x-swat/x-updates
  3. sudo apt-get update
  4. sudo apt-get install linux-headers-generic
  5. sudo apt-get install bumblebee bumblebee-nvidia bbswitch-dkms
  6. Reboot or re-login

Swat PPA has the latest Nvidia drivers.

Except that I log back in and ‘optirun glxspheres’ returns:

Luckily this can be fixed by editing /etc/bumblebee/bumblebee.conf. Look for the line that says ‘Driver=’ and add ‘nvidia’ at the end. Then reboot, and test with ‘optirun glxspheres’. The graphics card light should switch from blue to white, and the output should look something like the following:

The fix comes from here.

If its still not working try reinstalling using the advice at http://www.ivegotavirus.com/how-to-fix-bumblebee-on-ubuntu-12-10/

Hopefully this is a bit cleaner in 13.04.