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Archive for the 'Computing' Category

Firefox DNS cache clearing/disabling
Date: January 31st, 2010 by SiD3WiNDR
Categories: Computing, Interweb, Software

To disable the Firefox DNS cache, go to about:config in the address bar.
– Right click to select “New” -> “Integer”, enter “network.dnsCacheExpiration” as the preference name and “0″ as the integer value.
– Create another new integer called “network.dnsCacheEntries” as preference name and again enter “0″ as integer value

There is no facility to clear it, but possibly doing the above, then removing it again, could clear the cache.. Didn’t try it – just disabled it. My resolvers are on the local network so they can cache it for me – this way they ‘ll actually have something to do 😉

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Windows Stop 7E when changing motherboards
Date: January 17th, 2010 by SiD3WiNDR
Categories: Computing

So.. My PSU (Zalman ZM-600HP, should be good stuff) decided to die on me last wednesday, and it seems to have taken my motherboard (Asus P5Q-WS) with it to bit&byte heaven. Luckily both are still under warranty (or should be, at least) so hopefully I can get them replaced soon. Video cards, TV card, Disks and RAID controller escaped the pain, I hope I can say the same of the CPU and the RAM .. but I have no way to say right now.

However, I don’t really like the laptop for much else than sitting in front of TV chatting or surfing a bit, so for serious work I really want my desktop…

Still had an Athlon X2 board lying around, with some PCI Express slots, CPU, RAM, etc, so decided to build this in – after all, my offboard RAID controller should be OK to take along to a new system, no INACCESSIBLE_BOOT_DEVICE for me!

However… the ARC-1200 is not compatible with the A8N-SLI Premium… board simply doesn’t boot if you put it in any of the PCIe slots. So I took an 8-port PCIe Areca from the spare parts, as that could read my RAID on the disks at least; but this lead to INACCESSIBLE_BOOT_DEVICE because the PCI ID’s of the 2_port and the 8-port weren’t the same.

My wif’s PC to the rescue, put both Areca’s in, with the disks connected to the 2-port, this allowed me to install the 8-port’s drivers in Windows, then moved it all back to my own temporary PC… Yes, no stop 7B … but stop 7E?!

The machine booted in safe mode, so I was on the right track, and after some googling and fiddling, turns out you can’t down/upgrade easily from an Intel to an AMD CPU, as you will get the 7E stop.

Details are here – I didn’t get the info from this page (seeing as it talks about Virtual PC), instead clicked through on some forums, but it contains the solution none the less. Disabling the IntelPPM driver makes the crash go away (as is to be expected, this is an AMD CPU after all).

Had to reactivate Windows again but that was no biggie.. hope it will still reactivate when I have an RMA board.. 🙂

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RSS feeds
Date: October 18th, 2009 by SiD3WiNDR
Categories: Computing, Rants

A Best Offer Online Daily site on the Internet which shall remain unnamed publishes an RSS feed, showing their offer of the day with some descriptive information. Let’s call it format X, and location A. After a month or 2, they change the format of that file to format Y, still at location A. 3 days later, format Y moves to location B. A month later they change to format Z at location B. 3 months later, format P at location B. 5 months later, format Q at location C. Funny note there, format P at location B is still there, it just shows the same old item every day and is not cleaned up.

I use this RSS feed in an application and am pretty fed up trying to keep up with their flying shit implementation of RSS. I can’t imagine everyone goes to their site every once in a while and updates their RSS reader to yet another new location. Am I missing the point of RSS? I thought it was fire and forget… Sigh.

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Tuxdroid!
Date: August 14th, 2009 by SiD3WiNDR
Categories: Computing, Linux, ProTip

Quite a while back, I read in one of my magazines about the Tux Droid, produced by apparently Belgian company Kysoh. Back then, it cost 79 EUR. I wanted one, but I didn’t feel 79 euro was to be spent, so I put it on my wishlist. I revisited it a few months ago, and I almost fell off my chair when I saw the current price: 149 EUR!

My wife however found a nice deal a few weeks ago: if you buy the 2 year subscription to Linux+ magazine (for 49.99 EUR) you get a Tuxdroid as a welcome gift! That’s essentially a Tuxdroid for 50 euro with free shipping and with a free 2 year magazine as well 😉 Mine’s on the way, thanks to my wife who gave it to me as a gift – already received 2 issues and they’re interesting (read a chapter about forensics cd’s today).

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localhost not found
Date: July 18th, 2009 by SiD3WiNDR
Categories: Computing, Linux

I just had the following error while trying to start Smokeping on one of my newly installed machines:

ERROR: fping (‘/usr/bin/fping -C 1 localhost’) could not be run: localhost address not found

After digging around somewhat (this worked fine when run on the commandline) turns out my /etc/hosts was chmodded 700 instead of 744. Weird, but this meant only root could resolve it. What I don’t understand is why this did not work – my resolvers also return 127.0.0.1 for the “localhost” query.

Anyway, if you get this error, check if the smokeping user can resolve localhost too 😉

As Kris would say, it was some sort of DNS problem… 😉

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Thinking before you configure
Date: May 9th, 2009 by SiD3WiNDR
Categories: Computing, Software, Stupid

For a long while one of my servers “crashed” weekly. Every saturday at 3am the load would just spiral up and everything would become unresponsive (still working but slow) – everything was waiting on disk I/O. I kept putting off checking why this happened, and just rebooted the machine manually every saturday (lazy lazy). After a while I found out it was at 3am, so it had to be a cron job. I then noticed that one of my other servers also had a high load at 3am, but less high and it recovered.

Today I did some thinking and checking, and to blame was.. me! I had configured smartmontools to do a weekly long selfcheck at 3am on all 4 disks in the software RAID5 at the same time. This apparently took so much speed away from the disks that the machine didn’t cope.. Woopsie.

Note: hobby environment of course, real production I would have spent more time figuring it out 🙂

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Did Not Finish…
Date: May 7th, 2009 by SiD3WiNDR
Categories: Computing, Games

RIP 3DRealms – you won’t be forgotten 🙁

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Real Cisco-style CLI on Linksys SRW2024/2048
Date: April 9th, 2009 by SiD3WiNDR
Categories: Computing, Hardware

Via Zoiah, this nice article about something I’ve been missing for quite a while on my Linksys otherwise-crap-management switches 🙂

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Additional Bluetooth Drivers for Microsoft Bluetooth in Windows XP SP2
Date: December 14th, 2008 by SiD3WiNDR
Categories: Computing, Hardware

I was looking for drivers for one of my bluetooth sticks, lost the cd years and years ago, but finally got my usb ports in order on my new workstation, and wanted bluetooth. Apparently nothing wanted to support it, and all webpages seemed to indicate I should be using Microsoft’s XP SP2 stack… alas, no driver. Until I found this:

Additional Bluetooth Drivers for Microsoft Bluetooth in Windows XP SP2.

I just installed the MSI they offered for download, and everything started to work. Note for Google: Vendor ID 1131 Part ID 1001 (Vid_1131&Pid_1001) was my bluetooth stick and it’s working with this MSI installed.

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iotop on Debian Etch
Date: August 23rd, 2008 by SiD3WiNDR
Categories: Computing, Linux

One of my servers has a pretty high I/O load and I’m not quite sure where it’s coming from. Tried to install iotop but failed due to some missing dependencies. apt-get -t etch-backports python2.5 python2.5-minimal was not enough (and as you can see required backports packages) to have the deb package from lenny install,but actually just downloading the source package and running python2.5 iotop.py seems it would work.. if only I had compiled my kernel with io performance counters 🙁

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