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In April I installed gitorious for my colleagues, but the installation and the handling of this project were a bit annoying. So I moved our repositories to a new gitolite installation today.

Here is my easy and quick way to install Oracle Java on Debian / Ubuntu.

In the last time I was very dissatisfied with the overall system performance of my Sony Vaio VPCEB3Z1E Laptop and the installed Ubuntu 12.04. For example it took more than 10 seconds to start firefox or the chromium browser. Even the installation of new software packages via apt-get was slow. The main performance impact was caused by the installed Samsung SATA drive which was not able to read more than 80 MB per second.

In this tutorial I will describe how to setup and expand a replicated Glusterfs Volume on Debian Squeeze. Glusterfs is a clustered, scalable network file system licensed under the GNU GPL. Glusterfs should be able to handle petabytes of data anbd thousands of clients – may be I will try that later .. In my tutorial I will use only four storage server and one client.

In this tutorial I will describe how to setup gitorious on Ubuntu 11.10. Gitorious – a Ruby on Rails web application – can be used to conclude git projects in an easy to manage user interface.

Yesterday, I needed to determine the runtime of a Linux process for a monitoring script. Cos the format for start_time of the ps command may change if the process was not started in the same year, I decided to take the neccessary informations from the /proc/<PID>/stat file.

Canonical released a windows client for the online storage of the Ubuntu One personal cloud service. The Ubuntu One online storage allows you to synchronize your files across platforms (Windows, Linux, Android) and to publish / share selected files. This service is similarly to Dropbox. Now that all my clients are supported I tested the free Ubuntu One account that provides 5 GB of online storage with my Linux, Android and Microsoft Windows devices. The installation and setup on all devices was very easy and the service is still running smoothly. For this article I made some screenshots of the various clients and I will explain how to publish selected files.

In this tutorial I will describe, how to use nmon (Nigel’s performance Monitor) to monitor performance data in the interactive mode or in the capture mode.

My FAI (Fully Automatic Installation) install server was installed on Debian Lenny more than a year ago – now Debian Squeeze is released, and I want to install clients with the new Debian version. In the following quick tutorial, I will explain, how to extend an existing Debian Lenny FAI install server with Debian Squeeze.

Ok, Debian Squeeze is out for a while and now it`s time to setup a new FAI (Fully Automatic Installation) install server. In this tutorial, I will describe, how to setup FAI with dhcpd3 or dnsmasq for bootp and DHCP.

In this article I will describe how to test the plain and the encrypted SMTP/POP3/IMAP and HTTP protocols with telnet and the openssl s_client command.

I am still using XMPP (Extensible Messaging and Presence Protocol) aka Jabber for secure chat communication in my company, or for chats with friends. Lots of clients are available for every operation system – Microsoft Windows, Apple Mac OS X, Linux, iPhone OS and Android. After setting up a new server in our hosting location I installed ejabberd and wrote this small tutorial.

In this article I describe how to setup the postfix Mail Transfer Agent (MTA) with spampd as a before-queue content filter on Debian Squeeze

Which are the best Android applications for Sysadmins? As a System Administrator I looked around for Android applications that are helpful when I am on the move without a notebook. For this purpose I am using the applications described in this article now.

In this article I will describe how to setup a rescue system that – assumed PXE boot is supported – bootable via PXE / NFS over the network. Such a rescue system is useful if a node is not accessible after an reboot (for example after a distribution update). I approve grml as rescue system, but the setup should work with other linux rescue systems too (like SystemRescueCd, Knoppix). Anymore we will setup dhcpd, atftp, nfs and syslinux.

In this tutorial we will setup two Debian Linux nodes with a DRBD volume. MySQL will be available on the primary /actice node. If the primary node fails, the secondary /passiv node will takeover the MySQL daemon.

This article describes the setup of a redundant Linux OpenVPN gateway on Debian / Ubuntu and how to setup client authentication with certificates.