What is cloud computing? The basic idea is to have an abstracted model to separate physical IT infrastructure from logical IT infrastructure. Think about the OSI-Layer model and map it to the various infrastructure sets. (e.g. A customer is interested in the availability of a service. He doesnt care about the availability of the exact physical system.) This is called “Infrastructure as a service” short: IaaS

There are other aspects in cloud computing, which provide PaaS (Platform as a Service, e.g. Hosting) or SaaS (Software as a Service, e.g. Salesforce). Since EC2 allows logical
Since EC2 envirements allow a massive scaling of logical infrastructure, often the term “elastic” is used to describe parts of this technology.

EC2 compatible solutions (e.g. Eucalyptus and UEC) provide IaaS Services. The logical it is split into several components:

  • A Cloud Controller: The frontend coordinating everything. It’s accessed by an API, on the client side there are the ec2 tools on the shell or plugins like elasticfox for firefox.
  • A Storage Controller: This unit provides all the storage for the cloud. The storage comes in form of S3 which is also accessible over the web by API tools. It stores files as “Objects” in a “Bucket” objects can be made into “Bundles” by adding a prefix in front of their name. Another form of storage provided is EBS (Elastic Block Storage), which are partition images on the Storage controller, accessible by virtual instances (see below).
  • A Cluster Controller (Eucalyptus term, Amazon refers to clusters as “regions”): This unit controls the physical hardware and network configuration in the cluster.
  • Cloud Nodes: The physical servers running the cloud infrastructure.

The logical infrastructure built in the cloud consists of virtual servers, the so called instances. Instances are stored in form of templates. Every instance launched is started from the template, and looses all changes on termination. So specific configurations and data have to be stored in S3 or EBS. This seems a weird paradigm change at first, but makes perfectly sence, once you look at the migration paths available: Any kind of instance can be upgraded by upgrading and testing the template and then relaunching the instances. This massively reduces migration and administration cost, and makes this tasks just… elastic!

Auch wer noch keine Linux-Erfahrung hat, kann sich schnell in die Linux-Shell einarbeiten. Hier gibts drei hilfreiche Links:

Windows-User arbeiten häufig Remote auf Linux-Server. Dazu gibts die SSH-Suite:

  • SSH Einführung von Ubuntu.
  • WinSCP: Ein SCP-Client, mit dem man Dateien ähnlich wie mit einem FTP-Client hochladen kann.
  • Putty: Eine SSH-Konsole für Windows.

Und zum Schluss noch etwas für Ubuntu-Admins:

  • Ein Ubuntu-Cheatsheet mit den wichtigsten Administrations-Befehlen wie apt-get, sudo und so weiter..

The reconstructor is a program to remaster ubuntu CD-Roms. It’s written in Python and supports (officially) all ubuntu’s up to 7.10. So if one want’s to remaster kubuntu hardy, there’re two issues:

  1. It’s kubuntu.
  2. It’s Hardy.

For issue 1) there are several threads in the reconstructor forum. Here the most important ones:

A lot of (KDE) applications can be configured through reconstructor (third party) modules.

For Issue 2) There’s a simple explanation: It works with hardy, as tested in this configuration:

  • Use a (k)ubuntu hardy Setup as host system to install the reconstructor on.
    • We’ve got the X86 Kubuntu 8.04 Hardy for this.
  • The usplash works, pcx unknown (Diego has to try out the newest ISO yet)
  • Apt has changed a lot: You can’t add to /etc/apt/sources.list with constructor.
    • Hardy has a /etc/apt/sources.list.d/ directory now, you can put multiple source files there.
  • We remastered kubuntu, so the GNOME customization wasn’t used.
  • The VMPlayer plugin doesn’t work since hardy uses a new kernel, thus manual install works.

A tip if the terminal doesn’t start up: Execute the command “xhost +” on a console of your box.

If you need more documentation: Reconstructor is pretty well documented.