Installing virtual machines on a ubuntu server, managing them from a ubuntu desktop, and some other tips.

Some tips about the configuration of a MikroTik router.

We have about 40 computers installed with Edubuntu, and more than a dozen of servers (most of them running on virtual machines). They all need to be updated time after time with the latest version of packages. Also, time after time, new packages need to be installed. These packages come from some central Ubuntu Repository servers. All this activity for keeping computers up-to-date (up to the latest version) consumes lots of bandwidth and takes a lot of time. And there are new package updates almost every day! For one computer this can be acceptable, however for lots of computers it may become unbearable. One solution for this problem is to create a local mirror of the ubuntu repository.

We have two labs with 16 computers each. In each computer we have installed the latest version of Edubuntu (Linux) with almost the same configuration (partitions, installed packages, etc.). It is a bit of hard work to manage all of them one by one, so we have tried to find workarounds to manage all of them at once. There are different ways and solutions to accomplish this in Linux, but we have adopted a simple and practical one, suitable for our case.

We got from the ISP a single public IP, and we need to host our own public webservers (more than one) in our LAN. How to do this?

What is a Digital Signature, why it is an important part of the Digital Identity, and how it works. The authenticity and social problems related to the usage of the Digital Signature. The two authentication models, X.509 and OpenPGP, that can be used to solve these authenticity problems.

Rapid Application Development With SugarCE