Booting Ubuntu-14.04 cloud images without a cloud

Ubuntu-trusty

So, Ubuntu-14.04, Trusty Tahr, is out; and booting the cloud images requires a bit more hacking than booting the 12.04 cloud images. Here goes:

Get the image, resize and loop-back mount it:

wget cloud-images.ubuntu.com/trusty/current/trusty-server-cloudimg-amd64-disk1.img
qemu-img convert -c -O qcow2 trusty-server-cloudimg-amd64-disk1.img trusty-server-cloudimg-amd64-disk1_30GB.qcow2
qemu-img resize trusty-server-cloudimg-amd64-disk1_30GB.qcow2 30G
sudo modprobe nbd
sudo qemu-nbd -c /dev/nbd0 `pwd`/trusty-server-cloudimg-amd64-disk1_30GB.qcow2
ls image || mkdir image
sudo … Read the rest

Booting Ubuntu-12.04 cloud images without a cloud

images

I was recently asking myself why the P2V concept has not been more fully embraced by the open-source community – and generalized to V2C, virtual machine to cloud instance. From a scientific computing perspective, it would be ideal to seamlessly be able to prototype a data analysis in a virtual machine on a laptop and then run large-scale data … Read the rest

Backup Google Drive / Docs

google-drive
Cloud storage is often used for backup, but finding myself relying more and more on cloud-only documents, I felt a need for backup in the opposite direction: backing up my entire Google Drive to local storage – preserving the folder hierarchy. I was not able to find a script that does this, so I wrote one myself. I chose … Read the rest

Awesome Note + Google Drive

354491-awesomenote

For a long time I’ve been looking for a note-taking app that:

1) is available as an iPhone/iPad app ✔

2) synchronizes to either my own server or Google Docs/Drive ✔

3) has a web interface

4) supports organization of notes in hierarchical folders

5) has “todo” functionality (creation and due dates) ✔

6) allows assignment of priorities ✔

This … Read the rest

Squeezebox and the new LastFM API

squeezebox_mr

Since my last post about SqueezeScrobbler on my Squeezebox, I’ve enjoyed 3 years of LastFM listening on Squeezeboxes, Linux and Mac boxes, iPhones and iPads.

Well, this fall, LastFM announced that they would hit my listening pleasure with dual strikes: deprecation of the old API and discontinuation of the radio service in other countries than the US, UK and Germany. … Read the rest

Taking citizen cyberscience a step further

Citizen Science

Recently I’ve stumbled upon the terms citizen science and citizen cyberscience. The last term was apparently invented by Shuttleworth Fellow Francois Grey as a label for BOINC-based distributed computing projects like seti@home, folding@home and his own lhc@home. Grey is also behind the Citizen Cyberscience Centre in Geneva – on the web pages of which there’s more information to be … Read the rest

CERN School of Computing 2011 was… awesome

LectureNyhavnCSCCanoeing

As exemplified on the pictures above (from the photo gallery of one of the students), CERN School of Computing includes a good deal of extracurricular activities. Which probably goes a long way in explaining the good and humorous atmosphere in the classroom.

Having spent a lot of energy preparing the exercise with the great CSC team, it really was great … Read the rest

The vision of GridFactory

factory_c

In this post I’ll try to explain the vision behind a software suite I wrote at the Niels Bohr Institute, University of Copenhagen, 2009-11.

The ideas for the software arose from my dual involvement with the high energy physics and the e-science groups. Some of the code originated in previous projects, including distributed computing efforts of the ATLAS experiment at … Read the rest

Headweb on Boxee Beta 0.9.22.13692

boxeeheadweb

I’m quite happy with my small HTPC running Boxee on Ubuntu. The hardware is a Zotac Ion board with an Atom CPU and an Nvidia graphics card. Both software and hardware have their issues, but after enough hacking I’ve a setup that gets the job done wrt. watching movies off my file server. My main gripe has been the lack … Read the rest

CERN School of Computing 2011 – Exercise 2

In this exercise we’ll solve the same assignment as in exercise 1, but using a prepackaged GridPilot application.

  • Download and install GridPilot
  • Start GridPilot and answer the initial questions – enable only the computing system “GridFactory” and set the submission host to gridfactory.nbi.dk
  • Import the app “ttbar_exercise”
  • Select the application/dataset “ttbar_exercise-100k-events” and click “Run”
  • Select the application/dataset “ttbar_exercise-merge” and
  • Read the rest

CERN School of Computing 2011 – Exercise 1

pT diboson distribution.

pT diboson distribution.


This exercise was created for the 2011 CERN CERN School of Computing, hosted by the Niels Bohr Institute, University of Copenhagen.

Credits: physics content of this exercise by Jørgen Beck Hansen from the Niels Bohr Institute.

LHC Monte Carlo event generation and analysis

Assignment

Generate 500’000 LHC t-tbar events with PYTHIA and analyze the data: find bosons … Read the rest

Browser certificate and key export

This is a follow-up post to my previous post “Front door locks”.

I’m happy to announce a little utility that exports TCS certificate/keys to the hard disk – more precisely to your “.globus” directory where grid tools expect to find them.

Here follows instructions on how to use it:

First, you of course need to have some TCS credentials … Read the rest