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

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.

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.