At Tecnostore Group we always look forward to embrace new technologies. At the moment we’re working on version 10.06 of our DAS archiving products. For the first time ever, they feature an RSS reader consuming streams from this blog.

With this technology our customers stay informed without having to browse our homepages themselves or getting a lot of e-mails. It also enables us to communicate available updates, tipps for the products and more important information in an instant.

Technically the feed distribution is done using .net without any external libraries. Only dependencies used are the System.Xml classes and the Controls library. The components implemented are a GUI-Control to display the feed, one to display single feed items, and an RssConsumer class.

All this components will be released to the public in september as a part of the CodeFrame, an easy to use lightweight .net application development framework.

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!

That was the title of the ninth CAOS Report. Frightening at first glance, the study considers it but found that OSS is a process in software development. This in turn is known, but what is behind it?

Open Source Business-Model: Aptana Cloud
This service provides SVN hosting, debugging, etc for PHP developers. Those who work with the Aptana PHP IDE can, there hosting its source and its applications. The service costs $ 0.04 per hour. So U.S. $ 350.40 per year. Compared with 3-year-old Zend license (€ 717th -, ~ CHF 1000 -.) + with 3 years PHP Hosting SSH (SVN soon available),Aptana costs so much alike. (for $ 350.40, there is a 5 GB Space, 10 GB for $ 876th -, 15 GB for $ 1,664.40, 25 GB for $ 3241.20 a year).

That anyone can download the IDE for free, makes nothing of it:

  • Aptana is based on Eclipse. OSS should have lowered the development costs significantly.
  • Users to verify their licenses eliminated, saving lawyers and lobbying costs.
  • The free distribution of interest is marketing, the advertising budget should be deeper.

Aptana is the best example that open source is not a business model, but many attractive business models allows only.

As web workers sometimes have to fill out lots of forms, eg for entering lists of links to websites or search engines. Often need to always have the same shall be recorded. With Extensive forms a complex thing.
Das Firefox-Addon “Copy / Paste form” copied all the forms click on the shortcut menu. Subsequently, the values ​​of the context menu function “paste form” insert back into form. Especially with link lists a practical matter.

Read more about BoxBackup on boxbackup.org.
And the wiki.

Serverside Installation
for all these steps you need to be root, (sudo su).

apt-get install boxbackup-server
# it will look like its waiting for input, but its not just press Enter,
# and if it hangs press it again, until return to the console.

# configure backup directory.
#create a backup directory, if you want to use userland raid read this.
#you need to know the blocksize (4096) of the partition (/dev/sda1) where the backup is.
# dumpe2fs /dev/sda1 | grep -i ‘Block size’
mkdir /backup
chown -R bbstored:bbstored /backup
rm /etc/boxbackup/raidfile.conf
raidfile-config /etc/boxbackup 4096 /backup

# next is to configure the boxbackup server
# Be sure to replace “hostname” by the correct name.
rm /etc/boxbackup/bbstored.conf
bbstored-config /etc/boxbackup hostname bbstored

# last thing todo for the server is to create the certificates
# This will create a folder “ca”, which is very important, cause it is needed to create the client certificates.
# Also without certificates the backup can’t be used.

cd /root
bbstored-certs ca init
# Sign the certificates prepared by boxbackup.
bbstored-certs ca sign-server /etc/boxbackup/bbstored/boxbackup-server-cert-req.pem
# Copy (not move)
cp -a ca/servers/bserver.hjbaader.home-cert.pem /etc/boxbackup/bbstored/boxbackup-server-cert.pem
cp -a ca/roots/clientCA.pem /etc/boxbackup/bbstored/boxbackup-client-ca-cert.pem

# start the BoxBackup server
/etc/init.d/boxbackup-server start
# if there is no output at all, there is something very wrong..
# logoutput can be found in /log/syslog

Client Installation
for all these steps you need to be root, (sudo su).

Joomla 1.5 ist ja schon seit einer Weile draussen. Zeit mal ein paar nette Links & Fakten aufzuschreiben: