RasNTP : du Stratum 1 dans votre homelab «
By (author unknown) at

Comme tout bon geek, nous avons succombé à la tentation du Rasberry Pi et, comme beaucoup, bien avant de savoir quoi en faire. Après avoir passé la période Raspbmc, GPIO et même 100% wireless, nous ne trouvions pas d’usage “définitif” pour notre petite e-framboise, jusqu’à ce que nous rencontrions un gros  problème de NTP sur notre homelab.

En effet, dans notre lab, c’est une vm sous


qui fait office de routeur/firewall/proxy/ntp pour tous les vlan ce qui signifie que sans cette vm, pas de source de temps “fiable”. Lors d’une opération de re-câblage et dépoussiérage général, nous avons dû débrancher tout le matériel et donc le redémarrer un peu plus tard from scratch. Lorsque nous avions fini de redémarrer toute les vm, nous nous sommes aperçu que certaines étaient décalées d’une heure en raison d’un bios d’ESX mal configuré cumulé à un accès tardif à internet. Evidement 1h ce n’est pas bon du tout pour un domaine AD et tout ce qui en dépend, il nous fallait donc

une solution qui ne soit pas une vm, qui soit autonome, qui ne consomme que très peu d’énergie pour tourner 24/7 et qui n’ait pas besoin d’un accès à internet pour être une source de temps fiable

. Combiné à une vieille balise GPS usb qui traînait dans un tiroir, notre Rasperberry Pi allait enfin avoir un but dans la vie :

un serveur NTP Stratum 1


The Global Positioning System (GPS) is a space-based satellite navigation system that provides location and time information in all weather conditions, anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites.


About nine satellites are visible from any point on the ground at any one time, ensuring considerable redundancy over the minimum four satellites needed for a position.


GPS time is theoretically accurate to about 14 nanoseconds. However, most receivers lose accuracy in the interpretation of the signals and are only accurate to 100 nanoseconds

C’est sur le blog de Peter Mount que nous avons pu trouver un howto des plus simples au quel nous avons ajouté un dongle wifi usb :

Le tout monitoré grâce à un template cacti :

Et en prime, un module GPIO LedBorg RGB pour savoir de visu si la source GPS du serveur NTP est ok :

Enfin, pour les fanatiques de la précision, il y a le GPS/PPS sur Raspberry Pi détaillé par David Taylor.

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Comments (1) | April 15th, 2013

Happy Birthday - Proxmox VE is 5 years old!

By martin at!

Proxmox Virtual Environment is celebrating its 5th anniversary today! HAPPY BIRTHDAY!

And a big THANK YOU to all of you being with us for the last years. Many of you contributed to the project by providing code, sharing ideas or helping each other in the forum in a professional way!

In the beginning, only few people knew KVM, most projects focused on XEN. Now, five years later, KVM is the best established hypervisor in almost all Linux distributions.

Here are some recent statistics about Proxmox VE

  • 40.000 Proxmox VE hosts (daily updating servers)
  • More than 20.000 forum members with more than 70.000 posts
  • GUI translated into 16 languages

Keep connected and happy virtualization with Proxmox VE!!!

Best regards,

Martin Maurer
Proxmox VE project leader
By at

So… we made a game console.

And by “we” I mean you. OUYA wouldn’t exist without you.

Just last summer, we shared an idea for a simple, beautiful, powerful game console that lets any developer publish a game for the TV. We were driven by our love for couch gaming. And when you (and the rest of our early supporters) rallied around us, you inspired us.

We got here together.

Today, we honor you. Today we start shipping our early backers their OUYAs. And at our unveiling event this evening, the first of you will get to see OUYA in the flesh (or, metal, as it were).

Thank you.

Thank you for your encouraging words, for your belief when doubters doubted, for your feedback and ideas, and for your trust. And, I have to personally thank the OUYA team for the sleepless nights and sacrifices they’ve made to make OUYA for you.

A couple things our team wants you to know when you get your OUYA:

  • When you first boot it up, you’ll experience our first update :) This will either be super fast (seconds) or allow you to get a drink (minutes) based on your connection speed. Eventually, we want to do these updates in the background…
  • You’ll need a credit/debit card to download games. All games are still free to try. Your card will only be charged if you buy content you love. We do want valid payment information for everyone. This is to ensure that game developers can get paid when you love their game.
  • OUYA supports up to four controllers (you can always get more at And, because we support Bluetooth, you can pair other devices as well.  We are testing now and will start publishing a list of devices soon.

This is only the beginning.  Today begins an exclusive preview period as we gear up to launch in June. We’ll continue to add features, refine the user interface, and keep building the software as we head toward our retail launch — now announced for June 4.

We hope that you, our founding backers, continue to shape OUYA as we prepare to launch to the masses. Your feedback, to date, has been incredibly helpful and as you know, we’ve acted on many of your ideas and suggestions. We want your feedback on these first units. You know how to find us — but we are also creating forums keep the convo going.  In fact, we are planning an “AMA” (ask me anything) on Reddit to get your ideas. We’ll do this in April (date still TBD), after you’ve had time to give OUYA a whirl.

Start checking your mailboxes daily as these units roll out over the next few weeks. You’ll get an email when your console ships out of our factory. Keep in mind, it’s a rolling shipment, and consoles will be arriving at houses every day for the next several weeks.

Once your OUYA arrives: get playing!

As of 7:59 p.m. PT, there are already 104 published games on OUYA (all still free to try), like Final Fantasy III and some new surprises we think you’ll love: Beast Boxing Turbo, Stalagflight, Knightmare Tower, and even one called Save the Puppies. There are already a few entertainment apps, too. You can watch the TV shows and movies you already own with XBMC and Flixster, or watch games streamed through TwitchTV.

And developers are releasing new games for OUYA everyday. Eight thousand developers have created developer accounts with us so far.

Our hope is to see these game developers express their most creative ambitions through OUYA. We can’t wait to see what they unleash on our TVs.

OUYA on…


P.S. In case you missed it, as part of making OUYA the most open game platform around, we just announced that we published all the diagrams you’ll need to 3D print an OUYA yourself! Thanks MakerBot (who has a sweet 3D printer, and runs the Thingiverse community site)!