I made a change in the blogger configuration to ease the later work when blogging. It is possible that older entries are not correctly formatted.

Thursday 18 March 2010

Virtualization architectures

The linux technical review presented an overview of the different type of virtualizations architectures. I recopied the table as a reminder.

From the Linux Magazine 01/2010 Linux Technical Review:

Gleiche ISA Verschiedene ISA
System VMs Classic Hypervisors System Emulators
z.B.: Xen, VMware ESX z.B.: Bochs, Qemu
Hosted VMs Co-Designed VMs
z.B.: VMware Workstation z.B. AS/40
Prozess VMs Multiprogramming Dynamic Translation
z.B.: Linux, Windows z.B. FX!32, Transmeta
Binary Recoding HLL VMs
z.B.: Valgrind z.B. Java VM

Tuesday 16 March 2010

jsp:plugin

Rereading the Java EE 5 Tutorial I learnt there is the possibility to use the jsp:plugin to embed java applet into a page without having to take care of which browser is behind it. I still have to test this but this sounds really good.

Monday 8 March 2010

commandlinefu

I bought a number of linux magazine during my week holiday and discovered a number of new interesting, useful things:

  • Ubuntu One, a way to store data on some ubuntu servers to share it with other ubuntu users (I must check that)
  • Writer's Cafe, a tool helping creative writing
  • impro-visor, some GPL software working with lead sheets.

And one thing I really found useful is: commandlinefu (http://www.commandlinefu.com/). This site provides a way for people to advertise useful commandline tricks. I should probably follow them, I will learn a lot. And it already started.

I already learnt a new useful command: youtube-dl. Say you have some google URL:

http://www.youtube.com/watch?v=1504cSBhWG0

And you want to get the url of the file being downloaded, then you can use (-b for best quality and -g for just getting the url): $> youtube-dl -b -g http://www.youtube.com/watch?v=1504cSBhWG0

Of course this command has a certain number of options.