Reflecting on Essex

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This post is kind of long, and a little self indulgent. However, I really wanted to spend some time thinking about what I did for the Essex release cycle, and what I want to do for the Folsom release. I spent Essex mostly hacking on things in isolation, except for when Padraig Brady and I were hacking in a similar space. I'd like to collaborate more for Folsom, and I'm hoping talking about what I'm interested in doing in public might help with that. I came relatively late to the Essex development cycle, having never even heard of OpenStack before joining Canonical. We can talk about how I'd worked in the cloud space for six years and yet wasn't aware of the open source implementations at some other time. My initial introduction to OpenStack was being paged for compute nodes which were continually running out of disk. I googled around a bit and discovered that cached images for instances were never cleaned up (to start an instance, an image is fetched from glance, possibly has its format converted, is resized, and then an instance started with that resulting image, all those images were never being cleaned up). I filed bug…

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Call for papers opens soon

It's time to start thinking about your talk proposals, because the call for papers is only eight weeks away! For the 2013 conference, the papers committee are going to be focusing on deep technical content, and things we think are going to really matter in the future -- that might range from freedom and privacy, to open source cloud systems, or energy efficient server farms of the future. However, the conference is to a large extent what the speakers make it -- if we receive many excellent submissions on a topic, then its sure to be represented at the conference. The papers committee will be headed by the able combination of Michael Davies and Mary Gardiner, who have done an excellent job in previous years. They're currently working through the details of the call for papers announcement. I am telling you this now because I want speakers to have plenty of time to prepare for the submissions process, as I think that will produce the highest quality of submissions. I also wanted to let you know the organising for linux.conf.au 2013 is progressing well. We're currently in the process of locking in all of our venue arrangements, so we will…

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Rage of a Demon King

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I've been reading this book for ages, but finished it last night. It feels a bit trivial to be writing this now, but I tend to read more when I am stressed, and I finished this while waiting for the kids to go to bed last night, so I may as well quickly write it up. This book is the Kingdom war promised in Shadow of a Dark Queen and Rise of a Merchant Prince. I was a lot more comfortable with this book, because its mostly not about Roo wanting to shag every woman on the planet. In fact, a lot of people get their comeuppance, which is nice. However, heaps of people who don't deserve it also die. Its almost like a A Hymn Before Battle or Legion of the Damned, which are both books which stick in my mind as being ones where most everyone dies. Overall a good book, which a good ending which I think is a little rare for large scale combat novels. [isbn: 0006482988]

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It seems stickers are a gas

It seems that stickers are a gas -- they expand to occupy available space. We thought we'd ordered heaps of extra stickers to promote LCA 2013, but now we find ourselves running low. That's not a huge problem, but I do wonder if they are getting used or are just in the bottom of people's sock drawers. So here's the plan -- if you've got a LCA 2013 sticker and have stuck it somewhere, why not tweet a picture of it with the #lca2013 hashtag? If you don't use twitter, blog it or whatever and let us know at contact@lca2013.linux.org.au. The best picture will get a prize. I don't know what yet, because I just totally made this up. Perhaps a t-shirt. Perhaps a pet goat.

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Runner

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I bought this book on impulse, and I am glad I did. The book is very Buddhist in its outlook, and characters believe in reincarnation, which makes it ok for people to die. There sure is a lot of that happening in this book, perhaps more so than in Dietz's combat books. The underlying story is very different from the other Dietz stuff I have read, and very good. The Legion of the Damned books suffer from very one dimensional characterizations of their female characters, whereas this book has a strong female as a leading and fully developed character, which is a nice change. I enjoyed this book. [isbn: 9780441014095]

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Red Storm Rising

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I had read this book many years ago, and remembered it fondly. I wasn't disappointed reading it again -- its certainly a classic techno-thriller, even if it is a little dated now. I imagine it would make less sense to someone who hadn't grown up with the cold war, but within that context its a good read. The worst bit is that given what we knew back then it is so completely plausible. Great book. [isbn: 0006173624;9780006173625]

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Rise of a Merchant Prince

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I didn't really like this book, but I persisted with it because I want to keep reading the series. I thought the previous Serpent War book Shadow of a Dark Queen was weak, but this book was weaker. The book follows the rise of Roo as a merchant, and is improbable at best -- Roo's wealth is generated by cornering the food market for Krondor and I see weaknesses in the analysis there -- surely the Duke wouldn't allow such a manipulation of the market when it harms his citizens, why weren't there food riots when the cost of basic staples jumped to record levels overnight? Basically, it just doesn't seem believable to me. The sequence at the panthian lair on the other hand is much better, and the best bit of the book. Its a pity it is only about 50 pages long. [isbn: 0006497012;0071001007992;0380720876]

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Wow, qemu-img is fast

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I wanted to determine if its worth putting ephemeral images into the libvirt cache at all. How expensive are these images to create? They don't need to come from the image service, so it can't be too bad, right? It turns out that qemu-img is very very fast at creating these images, based on the very small data set of my laptop with an ext4 file system... mikal@x220:/data/temp$ time qemu-img create -f raw disk 10g Formatting 'disk', fmt=raw size=10737418240 real 0m0.315s user 0m0.000s sys 0m0.004s mikal@x220:/data/temp$ time qemu-img create -f raw disk 100g Formatting 'disk', fmt=raw size=107374182400 real 0m0.004s user 0m0.000s sys 0m0.000s Perhaps this is because I am using ext4, which does funky extents things when allocating blocks. However, the only ext3 file system I could find at my place is my off site backup disks, which are USB3 attached instead of the SATA2 that my laptop uses. Here's the number from there: $ time qemu-img create -f raw disk 100g Formatting 'disk', fmt=raw size=107374182400 real 0m0.055s user 0m0.000s sys 0m0.004s So still very very fast. Perhaps its the mkfs that's slow? Here's a run of creating a ext4 file system inside that 100gb file I just made on…

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Slow git review uploads?

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jeblair was kind enough to help me debug my problem with slow "git review" uploads for Openstack projects just now. It turns out that part of my standard configuration for ssh is to enable ControlMaster and ControlPersist. I mostly do this because the machines I use at Canonical are a very long way away from my home in Australia, and its nice to have slightly faster connections when you ssh to a machine. However, gerrit is incompatible with these options as best as we can tell. So, if your git reviews are taking 10 to 20 minutes to upload like mine were, check that you're not using persistent connections. Excluding review.openstack.org from that part of my configuration has made a massive difference to the speed of uploads for me.

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Announcement video

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I imagine that most people saw this at the conference closing. However, for completeness and because I feel that if we're going to put videos of other speakers online then I should suffer the same fate, here is the LCA 2013 announcement from Ballarat:

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