Ozark Henry @ Irisfeesten

May 13th, 2008

Last weekend the Iris festivities took place in Brussels. One of the headliner acts were performances by Daan and Ozark Henry. Of course I couldn’t miss out on that last one. We arrived just in time to enjoy Housewife, one of Daan’s latest and greatest songs after which it was Piet Goddaer’s turn to entertain the masses arrived at the Paleizenplein just in front of the royal palace.

As usual, this concert was a nice mix of his recent work as well some of his older hits, including “Sweet Instigator”, “Word up”, “Rescue” and even “Inhaling”.

To conclude, I’d like to say: “Merci, Piet!” ;-)


Ozark Henry @ Irisfeesten

Ozark Henry @ Irisfeesten encore

Monitoring MS SQLServer 2005 with Nagios

May 5th, 2008

Need to monitor a SQLserver with Nagios? There’s check_mssql.sh in the latest nagios plugins’ contrib folder. This check command only works with SQLServer 7 and 2000, though.

To make it work with SQLServer 2005, you only need to change 1 line in the script. Find this line:

echo -e "select loginame from sysprocesses where spid > $spid ...

and change it to

echo -e "select loginame from sys.sysprocesses where spid > $spid ...

Now, if your freetds installation (the actual SQLServer client that does all the magic) supports SQLServer 2005, you can run the script as though you’re checking a SQLServer 2000 installation.

Just got back from the mobileschool.org streetsleep event

April 19th, 2008

And it was good. Well, it’s actually not over yet. A lot of enthousiasts chose to sleep over at the Martelarenplein in front of Leuven’s railway station, to show solidarity with streetchildren in third world countries. Hopefully, this event will reach its goal by gathering enough attention to its cause.
A lot of workshops ranging from street cooking to street dancing, short sets by street artists for this occasion: Milow, Klaas from Yevgueni and Anton Walgrave, an election of the “nicest” street shelter made from rubbish.
I’m really impressed by the courage these people show by sleeping outside on this cold, rainy night. Hats off!

A small impression:

Milow@StreetSleep event

 

I’m looking for a Power Mac G4 case

April 18th, 2008

Well, actually it’s my girlfriend that’s looking for such a case. She wants to do something ‘artistic’ with it, but I can’t tell you what… yet.

So if anybody knows where to find such a case… (none of the innards have to be in working condition, but the case should look good from the outside), let me know!

pmg4qs.jpg

Adding custom facts to your Puppet environment

March 26th, 2008

Puppet, my favourite system administration tool, gathers facts about its managed hosts which can be used in administering these hosts.
These default facts are collected by Facter, one of Puppet’s dependencies. One can use these facts by querying using ‘facter’ on a managed host and in Puppet recipes, i.e. a description of how you want your hosts to be configured. A rather big set of facts are supported out of the box. Adding facts, however, can help you in making your recipes more clever.

That’s what I’ve been doing over the last couple of days. This page, “Plugins in Modules“, explains rather well how to add your custom facts. What it fails to tell you is that facts added through this mechanism are only available to Puppet and not to Facter.

So reading this blog post can save you hours trying to figure out why you custom facts don’t show up in the output of facter, because they never will. Executing a mail statement in which you mail the output of a fact, will show you the contents of your facts, however… ;-)

Xen bridging troubles

March 22nd, 2008

Well, not really Xen related, but I noticed that our blades became unreachable once the bridging scripts had run.

After reading a lot of bug reports about bugs in the default Xen networking scripts, a posting on the Xen mailinglist pointed me in the direction of the network driver.

Apparently, some versions of the Broadcom NetXtreme II network driver are somewhat buggy which reflects in broken bridges. In particular, the version included with the binary distribution tarball of Xen 3.1 is affected.

Luckily for us, the bnx2 driver included in the 2.6.18-6-xen-686 kernel available in Debian etch is OK and after a reboot, I had my fully working bridge.

I hope this post reaches other people with the same problems, because it cost me a lot of time to fix.

Update: This problem also occured randomly on some of our other servers, all running the same Xen 3.1 bnx2 driver. After an update of the kernel, these problems disappeared.

Free publicity!

March 4th, 2008

Yep, why not abuse my own, much-read blog… ;-)

I started my own little company! Go see my projects page!

In order to help out a friend for whom I helped troubleshoot some problems, I started an on-the-side activity with which I try to broaden my experiences. I even have my own business cards, designed especially for me! :-)

Go check it out, maybe I can be at your service someday.

Smack my book up!

May 26th, 2006

Kris pointed me to a nice video showing another nice possibility of the AMS sensor that is in all recent Apple notebooks.

Sometimes, it amazes me how a simple idea can turn out to be so cool: just detect a tap on your screen to switch screens. This idea was Erling Ellingsen’s idea.

I just installed it this afternoon and it’s really cool, though it will need some finetuning so it always switches in the right direction…

I have some doubts whether I will continue using it, because I like Exposé more than DesktopManager…

Anyway, one feature request would be to filter out annoying colleagues’ banging on the table…

MythTV workshop

May 19th, 2006

Yesterday I gave a small workshop on how to use a Linux machine as a digital multimedia center. As the intended audience was not the Linux-savvy geeks, I chose to use KnoppMyth and built myself a machine with MythTV 0.19-fixes on some very nice hardware, thanks to Kris: a total of 300 GB harddisk space and a Hauppauge PVR-500.
Anyway, if you want to read more about it, I’ve put my presentation online. You can download it here.

UKUUG LISA’06 Conference

March 23rd, 2006

I wish I could say this conference was perfect. It’s nearly perfect: good talks, good food, good accomodation, very nice surroundings (stay tuned to see the pictures ;-) ), but the worst IP access I’ve ever seen on a Unix conference. :-(

Having said that and having hooked up to a working uplink port this time, I found a very small amount of time to update you on our stay here in Durham.

But let’s start with day 0. Which started way too early and with a swollen throat… :-(
Kris and I took off at Brussels Airport at around 9:30 am on Tuesday to land 90 minutes later at Newcastle International Airport. We spent some time cruising through Newcastle. Which is a nice city, provided you like shopping. I honestly think this city counts more cash registers than inhabitants and more malls than bus stops.

Next, we took the train for a 10 minutes ride to Durham. Durham is a very nice medieval town in northern England. As for now, you’ll have to take my word for that, at least until I’ve found the time to upload some pictures. Chances are that won’t be the case until I’m back in Belgium, though.

For the conference itself then. As Kris and I only arrived in Durham late tuesday afternoon, we didn’t enroll for the samba tutorial. Given the fact that the audience is very diverse, most of what is mentioned would probably have been repetition for us anyway.

The first day of the conference itself then. We started off with an LDAP workshop given by Andrew Findlay. It was obvious this wasn’t his first talk about the subject. Even though most of the technical stuff he touched wasn’t new for me, it was nice to get some insight on historical reasons for LDAP features and decisions.

After the lunch I had to give my talk, which was a first for me: never before had I presented a paper at an international conference… ;-)

I wish I could say it didn’t show, and as the speaker I can of course claim I’m not in the right position to judge. I was however ready with my talk way before time. Which was actually a good thing, because with my sore throat, I’m not sure how much longer my voice would have lasted. Luckily there were quite a few questions regarding my paper and most of them were out of interest and not just because I’d not been clear enough on things.

In the evening, there was the Google sponsored conference dinner. Based on the reputation of the English ‘cuisine’ in the civilised world – I’m pretty sure I will end up being lynched for statements like this one – I didn’t expect much. But I was pleasantly surprised. First we had some nice quiche, followed by roast pork, steamed vegetables and Yorkshire pudding to be finished off by dessert which was fruit rolled in some kind of pancake with a custard sauce.
I really did enjoy it :)

Day two of the conference was the most interesting one, to me personally. Talks I remember are the talk on device mapper multipathing by Alasdair Kergon, the talk on Kerberos by Simon Wilkinson and the talk on Apache, mod_include and mod_rewrite by Aaron Crane from The Register. Kris’ talk, I’d seen one or two times before so there wasn’t really anything that surprised me there, except for Kris being a bit more nervous than I’d known him before. No thanks to Ray Miller who added some more to the pressure … :-)

Overall, I liked the conference and liked the people who attended it. Met some interesting fellow Unix administrators.
It’s certainly worth a repeat… :)

Next up, Kris and I will try and find something to eat, which won’t be too difficult with Durham being a university city.

Tomorrow, we’ll have to catch a taxi rather early because we have to get to Newcastle’s airport by twenty to ten (AM) to check in for our flight back to Belgium.

I’m looking forward to it. I’m not quickly homesick, but whenever the return date of a trip nears, I’m glad to return home. I’m starting the to miss Belgium… ;-)