Speaking at SCALE today!

I’ll be giving a talk at SCALE today about automatically deploying GlusterFS with Puppet-Gluster and Vagrant. I’ll be giving some live demos, and this will cover some of the material from:

Automatically deploying GlusterFS with Puppet-Gluster + Vagrant!

and it will contain excerpts from:

Screencasts of Puppet-Gluster + Vagrant

I’ll also be talking about some new upcoming features, and am happy to answer all of your questions!

The talk will be part of Infrastructure.next and is starting around 1:30 or 2pm in the Century AB room.

If you’re not able to attend, or you’d like a more personalized demo, send me a note! I’ll be around for the next few days.

Thanks to Joe Brockmeier and John Mark Walker for hosting the event and sending me here.

Happy Hacking,



Building a snow shelter

To give you a break from the usual GNU/Linux/DevOps/Puppet/GlusterFS drab, I’ve decided to have a go at writing a different kind of technical article. This article will show you how to build the traditional Canadian snow dwelling known as a quinzee. If you will be travelling to Canada, I recommended that you read through this article ahead of time, so that you don’t offend your host by being unfamiliar with their traditional living accommodations.


If you are not Canadian or if it is your first time building this type of shelter, I recommend that you have a professional supervise and guide you! If it is not sufficiently cold out (less than 0oC) when you are building or sleeping in your shelter, it could collapse, squashing and suffocating you! If it’s built correctly, a quinzee can safely support the weight of many people, although it is not intended for use as scaffolding. When you are inside the quinzee digging, you must have a buddy outside, standing watch for your safety, in case of quinzee collapse or polar bear attack.

Fresh snow:

Start off by choosing a place to build your quinzee. Usually you’ll build your quinzee near the other quinzees in the village, however for this article, I have decided to set up in a remote location, as this will be used as my vacation home. It is good to build on flat terrain, where there is a lot of fresh snow. In Canada, there is always an abundance of snow so it should be easy to find a pristine area.

Fresh snow

Fresh snow

If you build in a wooded area, be sure that there are no trees or dead branches that might fall or break off in the wind and squish you or your quinzee!


With each snowfall, new layers of snow are deposited onto the older layers which is called stratification. Since each layer could have different consistencies or strengths, it is important to mix or break up the layering before we build our quinzee. This will make sure that the walls of the quinzee are stable, and don’t shift later on.

Destratification of the snow

Destratification of the snow

Here, the layers of snow are destratified with a shovel, in a circle of about two to three metres in diametre. This circle will be the outside size of your quinzee. A three metre diametre quinzee would more than comfortably fit three large sleeping Canadians, which is the equivalent of two standard polar bears wide.

Piling the snow:

To make a quinzee, you need a large pile of snow. You’ll want to shovel the snow from outside of the destratified quinzee circle, into the centre of the pile. Work your way around the circle, gradually moving outwards as you need more snow. This technique has the added advantage that the area outside of your quinzee will be cleared of snow, and gives you room for stargazing, polar bear watching, and other typical Canadian pastimes.

A pile of snow

A pile of snow

After a few hours your pile will grow large enough that it should be about two to three metres high. You don’t have to worry about the specific height as long as you always throw the snow on the top of the pile. The pile will automatically spread out to form a larger diametre base if it is too high to be supported on a smaller base.

Some quinzee builders will pile their backpacks and other equipment in the centre of the pile under a tarp before piling on the snow. This is a tricky optimization, but if done correctly, there will be less snow to shovel onto the pile, and less snow to dig out at the end.

Large snow pile

A larger pile of snow

When not in use, make sure you don’t leave shovels or other items lying around on the ground, as they could easily get covered up by snowfall and lost forever. Conveniently, shovels can be stuck into the snow, where they’ll stand upright and remain visible.

At this point your pile of snow should now be complete. Congratulate yourself on a job well done and award yourself with a cool mug of maple syrup.


When digging out the quinzee, we’ll need to know how much snow to remove so that we don’t create unwanted windows in the wall of the shelter. To help keep track of the wall thickness, first gather about 40 to 50 sticks, each about 30cm in length. Insert all the sticks in the wall of the quinzee spaced out about 30cm from one another, and all pointing towards the centre of the shelter.

Sticks inserted into the pile of snow

Sticks inserted into the pile of snow

If the sticks are longer than 30cm, it’s okay if they protrude from the outside of the shelter. If they are too short, you can use them for firewood. When we dig out the shelter, we should encounter the sticks from inside the quinzee. Whenever you see a stick, you should stop digging in that direction.


At this point the quinzee needs time to settle. It typically takes between two and six hours. In this time, the snow crystals will lock together under their own weight, and the structure will harden because of the cold.

Waiting for compaction

Waiting for compaction

Although not easily noticeable, the structure may shrink due to this compaction. This is usually a great time to prepare lunch!


A typical Canadian meal might consist of bannock cooked on a stick, Montreal bagels, poutine, and a glass of maple syrup. Dessert is usually tire, served on snow. When your quinzee has sufficiently compacted, it’s time to start digging it out. If your quinzee needs more time to settle, then you can keep busy by gathering some firewood or practising your favourite Canadian song. While gathering a little firewood, I had a chance to take a quick photo looking down the main street of my village. On the right you can see some of the kindling I’ve collected, and in the distance to the left you can see a quinzee.

Main road of my village

Main road of my village


You typically want as small of a door opening as you can fit through. Start digging near, but above the base of the quinzee at a downward angle towards the centre. As you reach the centre, start digging outwards in all directions. The downward angle will prevent strong winds from blowing directly into the quinzee. The inner dome will keep heat from escaping. It takes some experience to get the shape right, but after years of practice, you’ll quickly become an expert.

Cross sectional diagram of a quinzee

Cross sectional diagram of a quinzee

This process should take you about an hour. When you are digging inside of the quinzee, remember to always have your buddy on the outside in the event of collapse. While collapses are rare, they can happen, in particular if the weather is too warm, if you didn’t let your quinzee settle for long enough, or if you made your walls too thin or your roof too thick. It is important that your buddy pay attention, because the quinzee insulates you from sound (and cold) very well. To demonstrate this, scream or talk loudly while you’re inside the quinzee. Your buddy will not be able to hear you very easily.

Entrance to the quinzee

Entrance to the quinzee

During the day, if you ask your buddy to seal off the entrance with their body, it will be very dark inside the quinzee, but you should be able to see faint blue areas where the walls are the thinnest and some light is coming in. You probably don’t want to dig much further in those areas.

Finishing up:

When you are finished digging out your quinzee, pull out one of the sticks in the roof to create an air hole for ventilation. You’ll probably want to gently smooth out the inside walls and roof with your gloved hand. This will prevent the jagged digging marks (snow stalactites) from dripping on you once you’re sleeping in the quinzee and your body heat is causing them to melt.

View from inside the quinzee

View from inside the quinzee of the door

As a related optimization, some quinzee builders like to light a candle in the centre of the quinzee for a few hours to try to melt any variations on the inner walls, causing a glaze and preventing dripping.

Making it a home:

It’s customary to line the bottom of your quinzee with either a tarp, or if it’s available, some hay. The hay is a particularly comfortable bedding material because it soaks up excess moisture which would otherwise make your floor damp. In general, Canadians only line their quinzees with hay when royalty or a special guest is coming to visit. If you do not receive any hay when staying over at a friend’s place, please do not be offended as it is hard to come by in a country that has a winter climate for most of the year.

Looking into the quinzee

Looking into the quinzee

To get in and out of your quinzee it is customary to crawl or slide in on your stomach. In the above photo, an inconsiderate guest decided to “walk” on their hands and knees, causing damage to the door. In some Canadian villages, damaging a neighbours door can be a great insult and has led to at least two serious incidents. [1] [2]

For sleeping, orient your feet so they are closest to the door, and with your head away from it. When multiple people are lying next to each other in this way, the quinzee can be quite warm during cold winter nights.


If you plan on leaving your home unattended for some time, it is common practice to destroy your quinzee so that small animals or children don’t get accidentally trapped inside should it be left unsupervised. Sadly, only a few days after I took these photos, a polar bear attacked my village and destroyed the quinzee!

What remained after a polar bear attack

What remained after a polar bear attack

One positive outcome of the attack is that you can get a good look inside the quinzee and you see a nice cross-section of the walls. Fortunately, this won’t cost me much in building materials, but it will be some time before I have time to rebuild, and even longer before I have time to get a guest quinzee built!

I hope this has been an instructional article! Stay warm, stay safe, and

Happy Hacking,


Scathing review of the Lenovo X240

I’m using a Lenovo X201 with 8GiB of RAM. Apart from some minor issues, I’ve been very satisfied with this laptop. It’s over four years old, and so I decided to see what’s available on the horizon. I did not buy an X240 because of the following reasons:

The X240 has only one slot for RAM and thus supports a maximum of 8GiB.

I think it’s pretty ridiculous for any successor to the X230 to support less RAM. In and of itself this is a deal breaker! My X201 has 8GiB, and I wish it had more! It doesn’t make sense to settle for less on new kit. In other words, Lenovo is stating that 8GiB ought to be enough for anybody.

The X240 keyboard is missing buttons.

The X201 keyboard has PageUp and PageDown keys in addition to the Forward and Back buttons which are located above the Left and Right arrow keys. It also has dedicated Insert and Delete keys. This is all to be expected, and is awesome.

The X240 removes the dedicated Forward and Back buttons, and replaces them with the (now relocated) PageUp and PageDown keys. To use the Forward and Back buttons, you now need an extra finger to hold the Fn button.

If that wasn’t bad enough, the Insert key now shares a button with the End key, which makes common Shift+Insert sequences near impossible to anyone that isn’t either a cephalopod or an Emacs user. Time to update the pedals to include an Fn key.

The X240 keyboard is missing buttons.

The X240 keyboard is missing buttons.

It’s also worth mentioning that the dedicated volume controls are gone.

The X240 “Trackpad”/”Touchpad” is now buttonless and unusable.

The mechanics of the new Touchpad makes it unusable! It has no buttons, and instead it feels like it is travelling 1cm vertically when it is pressed! This throws off any fine positioning you had with your cursor. Try it for five minutes, and you’ll quickly learn that this alone ensures that this machine can only be used as a desktop. Many, many users are complaining about the feel of the new pad. This feels like an attempt to imitate the look of an Apple product, instead of trying to maintain the functionality of the X series, except that the hardware isn’t very good.


I could deal with the below issues, if my top three (above) issues weren’t strong deal breakers! They are all easy to fix too! I hope these are addressed so that I can post a follow up “rave” article. ;)

Other issues/differences…

The X240 has a new, incompatible power adapter.

Lenovo has decided it needs to squeeze more money out of users by introducing new, backwards-incompatible technology. To this end, the well-known barrel adapter is now gone, and it has been replaced by a strange rectangle. You might as well throw out all your old power bricks, as Lenovo has said they won’t offer a compatibility adapter. Apparently, they used to sell such an adapter, but it has been discontinued.

The X240 has a new, incompatible docking bay.

If you were a fan of docking, you’ll now have to purchase a new bay.

The X240 has a combined microphone/headphone jack.

Minimalist designs and the abundance of cheap phone headsets has reduced the dual jack design to a combined single jack. I don’t like the change, but I realize there’s not much that can be done to prevent it.

Lenovo has a terrible warranty program.

Getting a hardware replacement with the Lenovo “return to depot” service can take about two weeks. Bringing your laptop in to a service centre is equally challenging. The locator database is out of date, and once you do find a service centre, many are unwilling to accept your hardware because they’re backlogged with work! If you are lucky enough to get a part replaced, hope that it isn’t defective or DOA. I had to go through three rounds of bad motherboards graphics on my X201. The on-site service is a good option if you can afford it.


Instead of iterating and improving on the much-loved X series, Lenovo has decided to sacrifice its followers in trying to appeal to a low-end laptop market. Once the model of power and portability, the X series is now designed for users who are afraid of having too many buttons or too much RAM.

The X220 and X230 are not available for sale anymore. The X250 isn’t due before 2015. I’ve extended the warranty of my X201 to the maximum of five years. Let’s hope someone at Lenovo reads this article and can make a difference before it’s too late. I’m happy to consult and demo new hardware if you contact me. I’d genuinely like to help.

Happy Hacking,