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lca Archives - AWS Managed Services by Anchor

Overview of Checkpoint and Restore – live-migrating processes on a Linux system

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We’re attending Linuxconf 2013 this week, being held down in our fair capital Canberra. There’s been some great talks so far, we thought we’d share one of the most interesting with you. In a nutshell, Checkpoint and Restore In Userspace (CRIU) is the ability to take a point-in-time snapshot of a running process (checkpoint), and revive it later, either on the same system or another system (restore). We’ll go over the difficulties in pulling this off, and what it’s good for. Problems – the rabbit hole goes much deeper At first blush, this sounds simple enough – dump the process’ memory and stash it away, then later restore it and fix up a few references in the kernel, too easy! Not so fast there, there’s a lot of subtle problems…

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Linux Conf Au 2009 Hobart – Day 5

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It was with regret that day 5 of LCA2009 came and went. But it was a blast! Simon Phipps of Sun Microsystems delivered the keynote, which mostly amounted to a scathing attack on the current state of the open source business model. People are going to be increasingly demanding for services they are interested in buying, not what the current flock of companies are selling. You don’t want to provide support for anything but RHEL or SLES? Too bad, to make money you’ll have to provide support for Fedora and SUSE. OK, maybe it’s not as straightforward as he made out, but it’s a realistic-enough sounding proposition. At the very least I expect the rapidly changing web development environment will be increasingly demanding of the latest and greatest tools on…

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Linux Conf Au 2009 Hobart – Day 4

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Day 4 of Linux Conf Au began with a hangover for many after the “Penguin Dinner” for professional delegates, and an equal number of empty wallets. The open source community generously gives a lot of their time to free software, and they are equally generous when it comes to other good causes such as the plight of the Tasmanian Devils. An auction was held for an impressive nature photograph print and other valuable items, at which we were able to raise an impressive $40,000+ figure. Awesome! The presentation on CELT: A Low-Latency, High-quality Audio Codec by Timothy Terriberry was an eye (and ear) opener. It lives up to the claims made in the title, and then some, with amazing quality. A live demo was given and I think it surprised…

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Linux Conf Au 2009 Hobart – Day 3

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Just a quick writeup for day 3, as I know you are still reeling from reading all about the first two action-packed days! We were lucky enough to have Tom Limoncelli give the keynote speech on Wednesday morning. He is the revered Systems Administrator who penned Time Management for System Administrators and The Practice of System and Network Administration, both of which are compulsory reading for every sysadmin at Anchor (we each have a copy of both books!), and he works for Google (no surprises there). Tom gave a fairly moving and unconventional speech about how we think we are living in an environment of scarcity, but we are actually living in an environment of plenty. We can give so much more to other people that costs us nothing, and…

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Linux Conf Au 2009 Hobart – Day 2

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OK, so I’m a little late on giving the day 2 review (and days 3-5), but in my defence I was just that busy LEARNING. Quite seriously though, the amount of information available to you at this kind of conference can be almost overwhelming. It is a task in itself just to keep up with the presentations. “747s on Treadmills: Experiences Scaling Uptime and Management” was a high-level look at large web-serving infrastructure rollouts by Matt Moor of Bulletproof Networks covering a project for an unnamed client that was expecting a very high amount of traffic to their charity website, peaking in November last year (surely you can guess the charity). As with many projects (and certainly with computer related technology) not everything goes 100% smoothly and indeed they did…

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Free as in beard

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The LinuxConf Penguin Dinner was held the other night, and the key event for the night was a charity auction. The goal in this case was to raise money to help save the Tasmanian Devil. It’s a great cause and bidding was moving along nicely with the auction being run by Rusty Russell and Bdale Garbee. Things eventually reached a plateau, however, and someone really needed to up the stakes a bit. Which led to calls for Bdale to pledge his beard. Beards are very Serious Business for hackers, and Bdale tells us he’s been growing his since 1982 when he was at college. It’s older than me! The bidding consortium that eventually won the auction also insisted that Linus Torvalds do the shaving. Thus, it was no small event…

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Linux Conf Au 2009 Hobart – Day 1

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What a feeling to be back amongst the sights, sounds and ah yes the smells of Linux Conf Au once more. It doesn’t seem so long ago that I was in Melbourne enjoying the fruits of the last conference. So what does this year have to offer? I am fortunate enough to primarily enjoy presentations that also most benefit my role as a Systems Administrator. There are plenty of great presentations though on other topics such as mobile/embedded devices and multimedia. The quality is high but I don’t tend to enjoy these as much. The first day (for me at least) offered a few ups and a few downs. “Is Parallel Programming Hard, And If So, Why?” by Paul McKenney was more of a philosophical look into the reasoning around…

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