Just bought anothor EeePC, this time the 900HD variant. Installing Ubuntu as we speak and giving Windows the boot. The 4 minute encounter with Windows XP (which felt like 4 hours) gave me the impression of a fast machine. This was just a quick peek to see if the hardware was working.
Going with Ubuntu 9.04 - then removing Pulseadio and (maybe) upgrading the kernel to 2.6.30.4.
The trick is to disable the hardisk in the BIOS and to disable all quick boot stuff in there too.
Excellent idea Ton!
How to make a custom filter in git to expand the string $Hash$ to something more usefull, ala the $Id$ (which git already supports), but then with more info (committer, date, etc.).
Which also helped in this case was the Pro Git book which is, as of now, a must buy.
But as always is the case between Ton and me, I find his scripts too long :-) So I miekified his solution.
In Perl you have this:
% perl -e 'print "a" x 5, "\n"' aaaaa With that you can easily create a separator string consisting out of 60 spaces.
I always missed this in my shell - until now.
In Zsh have the following expansion:
l:expr::string1::string2:
Pad the resulting words on the left. Each word will be truncated if required and placed in a field expr characters wide. See zsh.dotsrc.org. There is also a r: variant which operates in the same way.
While rechecking my rdup test-suite one of the tests failed. On closer inspection it was due to the following line:
DAY_BEFORE=$(( $(date +%d) - 1 )) When $(date +%d) is 10 this yields:
$ DAY_BEFORE=$(( 10 - 1 )) $ echo $DAY_BEFORE 9 Also with octal values (those starting with a leading zero), it also works:
$ DAY_BEFORE=$(( 06 - 1 )) $ echo $DAY_BEFORE 5 So when does this go wrong?
A customer wanted some performance figures for a ESX cluster we built. We used our own atop and the trusted workhorse of plotting Gnuplot to make some performance plots.
Creating the data As said, we used atop for this, it has a nice data gathering mode which prints out lines like these:
13:40:07 cpu %usr %nice %sys %irq %softirq %steal %wait %idle 13:40:08 all 0 0 0 0 1 0 4 95 13:40:09 all 0 0 1 0 0 0 0 99 We were interested in the values of %usr, %sys, %irq + %softirq, %wait and %idle.
So you think you know git… today I found out something “funny”. In a git repository:
$ git log $ fatal: object 1fcc8de9361c56e538ff35d8cc4b07a9c95b7bf3 is corrupted Okay, WTF? Lets look in the .git directory:
$ cd .git/objects/1f $ ls -l total 4 -r--r--r-- 1 root root 1057 2009-06-23 19:03 03db070bcb47bff3f8106f2ec7028b3496aaa8 -r--r--r-- 1 root root 0 2009-08-03 21:41 cc8de9361c56e538ff35d8cc4b07a9c95b7bf3 Ah, 0 bytes, that explains it (probably due to the weird reboot of last night and ext4).
Finally made the switch to jackd which works so much better than Pulseaudio. Ubuntu did not make this easy, but with some perseverance it works. One of the things I really hate about Pulseaudio is that when I click on a new song in audacious it would take about 1 second before the audio stabilized. Also with flash audio would stutter for the first few seconds.
First (if you don’t care about gnome-desktop):
If you ever administered a DNS server you are probably familiar with the IN (internet) class, as in
localhost IN A 127.0.0.1 where you define an IP address for the name localhost. As you may, or may not, already know there are other classes defined (but hardly used) for the DNS. Two of those are the Chaos class (CH) and the Hesiod (HS) class. With these classes you can create some sort of parallel world where you can also define names.
Do I want this?
% ls -ld Joe_Cocker_-_The_Definitive_Collection drwxr-xr-x 2 miekg admin 4.0K Jul 20 22:20 Joe_Cocker_-_The_Definitive_Collection/ % cd *joe* cd: no such file or directory: *joe* % unsetop case_glob % cd *joe* % pwd /shared/vol/music/J/Joe_Cocker_-_The_Definitive_Collection
Currently we are building a fairly rock solid high availability cluster for a client. This has the “usual” ingredients: two locations, two NetApps, two clusters of three vmware ESX servers and a bunch of virtual machines running on top of the ESX servers. Also included in the mix is a VDI (now called View) virtual desktop infrastructure for running virtual windows XP clients.
This is all managed by SRM (site recovery manager) and it is almost working.
I’ve told a few times about how to build a library.
But there a some extra things that must be done before you can call yourself a complete librarian.
ID-ing the books you have Storing the information Marking the books Sorting and shelving the books Remembering who borrowed what ID-ing books For this I bought a barcode reader that reads the ISBN number of the book’s backcover. With book_get (Perl code) I can retrieve the author, title, genre and year published from Google.
I already knew (Open)Solaris sucks, but now Ton has also figured it out.
ZFS definitely does not suck. Why not petition Oracle to GPL(v2) ZFS? Especially now Oracle wants to kill OpenSolaris?
Yes! At work today we made dhcpd crash on a /etc/dhcpd.conf :) We were working towards the following (now working) setup:
class "igel" { match if binary-to-ascii(16, 8, "-", substring (hardware, 0, 5)) = "1-0-e0-c5-67"; } pool { allow members of "igel"; range 192.84.30.161 192.84.30.170; # igel[0-9] } But while figuring this out, dhcpd went boom :)
[root@vmaster cfengine]# dhcpd -d -f -cf hosts/vnet/etc/dhcpd.conf Internet Systems Consortium DHCP Server V3.0.5-RedHat Copyright 2004-2006 Internet Systems Consortium.
I wanted to pretty print my labels on my (new) Dymo 400 label writer. All the howtos I found were detailing how to use LaTeX to print a sheet of labels. But I needed some LaTeX-foo to print only one. So /me to the rescue…
My labels are 36mm X 89 mm (Dymo part #99012) after some trial and error and four misprinted labels I came to the following LaTeX code which fits the text on the labels:
We (my wife and I) have a lot of books, currently some 637…
$ sqlite3 biblio.db 'select count(*) from books' 637 But we seem to loose books occasionally because we lend them to people and forget about it. So Linux (and Perl) to the rescue. I already own a bar code reader to read the ISBN number of books and then I use Google to give the author, genre, etc. (fully automated of course).
This is an English translation of a blog item I wrote for AT Computing
While giving a course a student showed me the following:
$ ps -ef > /tmp/file Where /tmp is 100% filled yields no errors and seems to have worked!
Lets try to see what is going on here.
Firstly, lets fill up a file system. We are going to use an fs mounted under /media/disk:
$ cp /dev/zero /media/disk/HUGE $ cp: writing `/media/disk/HUGE': No space left on device Further we need a little program to test a few things:
Well, thanks to Ubuntu I’m now running the new (new!) 2.6.30 kernel on my systems.
No ill effects as of yet…
Btw, I’ve written the following script to download the latest kernels from Ubuntu:
SYNOPSIS: latest 29.4, this will fetch 2.6.29.4 or latest 30 which will get 2.6.30.
#!/bin/bash # download the latest ubuntu mainline kernels ubuntu="http://kernel.ubuntu.com/~kernel-ppa/mainline/" version="2.6.$1" # need 29.n as argument arch="i386" # or amd64 major=${version%.[0-9]} minor=${1%.[0-9]} patch=${version#2.6.*.} [ -z "$1" ] && { echo -e "Usage: $0 MINOR\n$0 29.
Suppose you want to limit access to some servers, only people member of a specific group (or multiple groups) may log in.
The following is one way to tackle this. In this example I will configure ssh access in such a way that only people from the admin group can login. The nice thing is that this will work regardless of any Kerberos or LDAP usage.
Preparation In /etc/pam.d find the “service” which you want to add a group policy to.
Mental note to self
Having a host listed in a listprincs output isn’t enough to have single-sign-on working.
You have explicitly add it with ktadd host/your.host.com
So in my case:
# kdadmin.local .... kadmin.local: addprinc -randkey host/charm.atoom.net ... kadmin.local: quit And then you can do a (on charm.atoom.net):
% kinit Password for miekg@ATOOM.NET: % slogin elektron.atoom.net And have a password-less login to my server.
I wanted some git information in the prompt I currently have. While thinking and googling about this, a quote on Bart’s log got me thinking. I don’t need to see my current host, nor do I need to see my current user name.
I always login under my own account (miekg) and if I do change accounts, I probably will be forced to use bash. So showing the current user name is quite useless.
I’ve done some work in the development of the DNSSEC protocol, this culminated (for me) in RFC 4641. At the time I was a big proponent of DNSSEC. I still think the DNS should be improved and also believe DNSSEC is one of the best solutions. I’m however not as sure about this as I once was. This is because of several reasons.
The first one being the development of the NSECn record.
Not wanting to miss anything on this short urls business, I’ve implemented something similar in nanoblogger.
How? With a shell script and symlinks, my dear Watson. As with all shell scripting this is probably something you can do drunk.
First I need to get a list of all my articles so that I can link to them. Next I take this permalink address, pipe it through sha1sum, take the last 10 characters and make a symlink from the permalink path and presto: short urls
Oh my God — why?? This is a 250 GB disk with a USB2 interface, so I’m in for a long wait apparently.
# mkfs.ntfs /dev/sdc1 Cluster size has been automatically set to 4096 bytes. Initializing device with zeroes: 4% It this the Windows-way or is mkfs.ntfs a little bit brain dead?
All these wordpress blogs have a related articles line below the blog entries. Sadly nanoblogger does not have such a capability, so I wrote my own. It’s not a plugin in the nanoblogger sense of the word, it may be possible to rewrite it as a regular plugin, but I do not now how…
So for now a simple shell script, which you can find here.
Usage within a template In your templates you should include the following: