Category: Revelation

I’ve mentioned already that I put a system on a local rack, and in order to cut costs I divided it up into three sections using Xen. Well, I had this annoying little problem that the “domU” (user domains – ie. the shares) weren’t able to use iptables. So I’ve gone back to the drawing board by slapping a couple of drives I have kicking around into my Windows box and trying various experiments.

First, I went back to the “step-by-step” how-tos that I’ve been using so far. They’ve updated it for Xen 3.0.3 (I actually installed Xen 3.0.2 using a how-to written for 3.0.1). So I ran through it – no joy. The domU boots, but mounts the ext3 file system as ext2 and won’t do iptables.

Tried again with their instructions on how to compile a kernel, except the instructions say to compile in iptables support, but don’t tell you how to compile in appropriate device driver support so I ended up with no network in my dom0 (the controller domain).

Then I found another “how-to”, this based on the fact that Xen is in the Debian “sid” (aka “unstable”) branch. Updated the test machine to “sid”, then went through the how-to. Initially, couldn’t get xend to start up, but then it turns out that I’d installed xen-hypervisor-3.0-unstable instead of xen-hypervisor-3.0.3. Got that installed, got the domU up and running, but DAMMIT, still the same problem. When I tried to do an “iptables -L”, it would tell me that “QM_MODULES: Function not supported”. Same if I did a “depmod -a” or “lsmod”.

While I was working this angle, I discovered that the Debian Backports project had backported Xen to “sarge”. Hmmm, I thought, if this works out I’ll have to try the Backport to see if I can do this on the rack with minimal hassle and without having to run “unstable” on a “production” server.

That’s when I discovered something interesting – modutils is old, and if you’re going to be using 2.6+ kernels only, people recommend you install module-init-tools instead. Since I’ve been installing Debian “sarge” (aka “stable”) in the domUs, and “sarge” is designed to support 2.4 and 2.6 kernels, it installs modutils instead. I installed module-init-tools, and suddenly everything worked.

Hey, I thought, maybe I don’t have to go through all this pain. I went to my real xen system, installed module-init-tools on the domU, and everything works! No need to go for the Backport. Maybe I will later, but for now I’ve got what I want, and I can install ssh-blacklist on my domU.

Ok, I’m going to sound like a total Apple fan-boy with this, but I have to say it. Yesterday, my iPod fell out of it’s case. I picked it up and suddenly without the extra bulk of the case, I was once again struck by how utterly perfect it is. It’s small, it’s light, it’s beautiful, and the user interface is great. It feels good in your hand.

Ok, the screen is a bit scratched up, and so is the shiny back surface. But it’s still a wonder of modern industrial design.

And I look at the Zune, and I see an ugly brown brick, and I think “what the hell were they thinking?”

And before you write me off as a total Apple geek, I had the same feeling with my Treo when I used it for a day without the heavy magnesium innopocket.com case. Not as perfect as an iPod, but definitely smaller and sleeker than I normally think of it because I normally have it in that case.

Today, in spite of how busy we are we got the word from our new boss Nancy that we all had to go to the monthly division meeting. (Ok, here’s where I prove how little attention I pay to the heirarchy: I don’t know if Nancy is Dave’s boss, or Mike’s boss, and I don’t know what slice of the company that meeting is really for, but let’s just call it ‘division’ for now.) I never go to these things, but first we got a message from Nancy saying she expected everybody there, and then another message from Dave saying he’d gotten the word that no matter how busy we were, we should make every effort to get there.

It was the typical boring monthly meeting – announcing all the anniversaries and stuff. But then they started handing out these enormous plaques to people who’d recently gotten patents. I’ve seen these plaques on people’s desks before, but I’ve never seen them handed out. And I’ve only ever seen them on pretty senior people’s desks. I wasn’t expecting one – my patent was awarded months and months ago, and besides I’m a lowly contractor. But I got one, and it had little tags for both of my patents. My boss, Dave, got one as well, with the same two tags.

Afterwards, Nancy told me that the whole reason she’d made the meeting mandatory was to make sure that Dave and I went, because neither of us were prone to going to these meetings.

Getting the plaque was surprising enough, but even more surprising was for the rest of the day people were coming up and congratulating me. Now, I’m not thrilled about the concept of software patents at all, so I didn’t really know what to say. At first, I was saying stuff like “Oh, it wasn’t such a big deal” or “I’m not too proud of it”. But then I thought that probably isn’t very gracious of me, and might be insulting to other people who’ve gotten patents or who want them and haven’t gotten them yet. So then I started just saying “Thanks” and leaving it at that. But still later, some fellow software developers came up to to congratulate/razz me, and I decided the best response was that it was a team effort and I feel sad that we couldn’t credit everybody on the patent. I also told one of the developers that one of the things she did, an automatic “matcher” algorithm, was definitely worth a patent and she should apply for one herself.

Ok, I’ve delivered a version of the code I’m working on with all the bits hooked together so that it should be test-able. Now I have to wait for a build to be produced so that I can install it on a test machine and start finding out all the ways it’s broken.

Since it’s going to be at least a couple of hours before the build is done, I’m going to go home and relax, try to not watch any election stuff, and relax before I start Stage 2 Of Hell tomorrow.

When you move your blog to a new host:

1. If your want your Powerbook to see the dns change, issue the command lookupd -flushcache
2. When you move a database from MySQL 5 to MySQL 4 using the compatibility mode of mysqldump, it doesn’t move the auto_increment attribute, and you have to restore it using alter table wp_posts change id ID bigint(20) auto_increment;