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This tutorial explains how you can revert failed apt operations (like apt-get upgrade) and roll back to the previous system state with apt-btrfs-snapshot on an Ubuntu 12.10 system that uses the btrfs file system. apt-btrfs-snapshot creates a snapshot of the system before the apt operation. Being able to easily restore the previous system state after a failed apt operation takes away much of the pain system administrators have to deal with normally and is one of the greatest features of the btrfs file system.

This tutorial describes the installation and configuration of Z-push on a Debian Squeeze server with ISPConfig 3. Z-push is an open-source application to synchronize ActiveSync compatible PDAs and mobile phones. Z-Push was initially developed by Zarafa Deutschland GmbH (Germany). At the end of this tutorial, your customers should be able to sync their mobile phones, by using push technology, with their e-mail accounts stored on your server.

This tutorial shows how you can set up an Ubuntu 12.10 desktop that is a full-fledged replacement for a Windows desktop, i.e. that has all the software that people need to do the things they do on their Windows desktops. The advantages are clear: you get a secure system without DRM restrictions that works even on old hardware, and the best thing is: all software comes free of charge.

This tutorial describes how you can install Apache2 with mod_fcgid and PHP5 on OpenSUSE 12.2. mod_fcgid is a compatible alternative to the older mod_fastcgi. It lets you execute PHP scripts with the permissions of their owners instead of the Apache user.

According to What's New in MySQL 5.6, MySQL 5.6 will bring some performance improvements over MySQL 5.5. If you want to test out MySQL 5.6, you have to install one of the development releases from the MySQL downloads page because there is no stable release yet. This tutorial explains how to install the MySQL 5.6.8rc1 (Linux Generic) development release on an Ubuntu 12.10 server.

This tutorial shows how you can set up a Kubuntu 12.10 desktop that is a full-fledged replacement for a Windows desktop, i.e. that has all the software that people need to do the things they do on their Windows desktops. The advantages are clear: you get a secure system without DRM restrictions that works even on old hardware, and the best thing is: all software comes free of charge. Kubuntu uses the KDE desktop environment.

This tutorial shows how to get DKIM working on a CentOS box running Postfix using OpenDKIM. I'll also cover some simple troubleshooting tips and advice for future upgrades on your OpenDKIM installation.

This tutorial shows how you can serve CGI scripts (Perl scripts) with nginx on OpenSUSE 12.2. While nginx itself does not serve CGI, there are several ways to work around this. I will outline two solutions: the first is to proxy requests for CGI scripts to Thttpd, a small web server that has CGI support, while the second solution uses a CGI wrapper to serve CGI scripts.

There may be the situation that you have to monitor a MySQL server remotely. There are some linux tools to do performance and query monitoring locally, and these tools can also used to monitor remotely - but only unencrypted! Also often MySQL is only listening on the loopback interface, so it is even not reachable remotely over the net (which is very good seen from the security viewpoint). But there is an easy solution in the Linux world.

This guide explains how you can install and use KVM for creating and running virtual machines on an Ubuntu 12.10 server. I will show how to create image-based virtual machines and also virtual machines that use a logical volume (LVM). KVM is short for Kernel-based Virtual Machine and makes use of hardware virtualization, i.e., you need a CPU that supports hardware virtualization, e.g. Intel VT or AMD-V.

If you've spent any time examining the network traffic to and from your web browser, you will notice the prolific number of trackers embedded in the pages. There are some add-ons to the web browsers that aid in privacy, but it is simple enough to block the rogue sites at the firewall.

Lighttpd is a secure, fast, standards-compliant web server designed for speed-critical environments. This tutorial shows how you can install Lighttpd on an Ubuntu 12.10 server with PHP5 support (through PHP-FPM) and MySQL support. PHP-FPM (FastCGI Process Manager) is an alternative PHP FastCGI implementation with some additional features useful for sites of any size, especially busier sites. I use PHP-FPM in this tutorial instead of Lighttpd's spawn-fcgi.

SPDY (pronounced "SPeeDY") is a new networking protocol whose goal is to speed up the web. It is Google's alternative to the HTTP protocol and a candidate for HTTP/2.0. SPDY augments HTTP with several speed-related features such as stream multiplexing and header compression. To use SPDY, you need a web server and a browser (like Google Chrome and upcoming versions of Firefox) that both support SPDY. mod_spdy is an open-source Apache module that adds support for the SPDY protocol to the Apache HTTPD server. This tutorial explains how to use mod_spdy with Apache2 on Ubuntu 12.10.

Nginx (pronounced "engine x") is a free, open-source, high-performance HTTP server. Nginx is known for its stability, rich feature set, simple configuration, and low resource consumption. This tutorial shows how you can install Nginx on an OpenSUSE 12.2 server with PHP5 support (through PHP-FPM) and MySQL support.

This tutorial explains the installation of a Samba fileserver on Ubuntu 12.10 and how to configure it to share files over the SMB protocol as well as how to add users. Samba is configured as a standalone server, not as a domain controller. In the resulting setup, every user has his own home directory accessible via the SMB protocol and all users have a shared directory with read-/write access.

This document describes how to install a Postfix mail server that is based on virtual users and domains, i.e. users and domains that are in a MySQL database. I'll also demonstrate the installation and configuration of Courier, so that Courier can authenticate against the same MySQL database Postfix uses. The resulting Postfix server is capable of SMTP-AUTH and TLS and quota. Passwords are stored in encrypted form in the database. In addition to that, this tutorial covers the installation of Amavisd, SpamAssassin and ClamAV so that emails will be scanned for spam and viruses. I will also show how to install SquirrelMail as a webmail interface so that users can read and send emails and change their passwords.

This tutorial shows how you can install and run a Question2Answer web site on a Debian Squeeze or Ubuntu 12.10 system that has nginx installed instead of Apache (LEMP = Linux + nginx (pronounced "engine x") + MySQL + PHP). nginx is a HTTP server that uses much less resources than Apache and delivers pages a lot of faster, especially static files. Question2Answer is a free and open source platform for Q&A sites.

This Howto describes the way to set up two factor authentication with one time passwords for Apache2. We assume, that you have already set up your LinOTP server. You can download Debian and Ubuntu packages or you can install the system using the Python Package Index. It provides a good quick start to get the service up and running for demo purposes (check for the latest version).

This tutorial shows how you can install an Apache2 webserver on an Ubuntu 12.10 server with PHP5 (through PHP-FPM) and MySQL support. PHP-FPM (FastCGI Process Manager) is an alternative PHP FastCGI implementation with some additional features useful for sites of any size, especially busier sites.

This article explains how to use the nginx HttpLimitReqModule to limit the number of requests for a given session. This is useful, for example, if your site is hammered by a bot doing multiple requests per second and thus increasing your server load. With the HttpLimitReqModule you can define a rate limit, and if a visitor exceeds this rate, he will get a 503 error.