Planet RoEduNet

The Alternative PHP Cache (APC) is a free, open, and robust framework for caching and optimizing PHP intermediate code. It's an PECL (http://pecl.php.net/index.php" name="PHP Extension Community Library" title="PHP Extension Community Library) extension which shares the packaging and distribution system with its sister, PEAR (http://pear.php.net/" name="PHP Extension and Application Repository" title="PHP Extension and Application Repository).

I'm sure if you're responsible for any server connected to the Internet with a "real" IP address, or if you port forward :22 to a box on your LAN, your logs will contain a lot of failed SSH attempts. Here we'll look at some simple solutions.

It is often a waste of time for the person on the other end of the phone to listen to the support guy without really seeing what goes on. Using GNU screen two people can watch what is happening, and we'll show how here

If you spend a lot of time creating new shell scripts, be they plain shell or scripting languages such as perl or python, then it can be very useful to make new scripts be executable by default. Here we'll show two simple recipes for GNU Emacs and vim to do just that.

The purpose of this Guide is to give you a straight-forward, Debian-friendly way of installing and configuring Kerberos. We will go through introduction to Kerberos, installation, configuration, PAM config and setting up of encrypted telnet/ftp session to the server. We will show how to use Kerberos logins as a replacement for SSH keys, and how to use standard (optionally encrypted) telnet/ftp connections instead of SSH.

The current look of this site hasn't changed much for the past two years, apart from a few additional CSS rules being used by default in article texts. Whilst the content here is hopefully of sufficient quality to allow the current design to be tolerated I'm sure we can do better.

The idea behind the whole set-up is to get a High availability two node Cluster with redundant data. The two identical Servers are installed with Xen hypervisor and almost same configuration as Cluster nodes. The configuration and image files of Xen virtual machines are stored on drbd device for redundancy. Drbd8 and OCFS2 allows simultaneous mounting on both nodes, which is required for live migration of xen virtual machines.

The point of this how-to is to describe the way to migrate to a full-encrypted LVM system (rootfs + data) (only the boot partition obviously stays unencrypted), either coming from an LVM system, either from a simple ext3 system. All you need is some kind of external storage.

I am responsible for a production web server that is very critical to our clients and the bread and butter of our company. We have collocated the server, for reliability of power, A/C and Internet connectivity as well as cost effective high bandwidth. Here, we describe how to maintain a redundant server with the configuration of an identical standby machine.

Making a backup disk is usually an obvious task, but making the disk ready to boot so that it can immediately be used as a replacement can be tricky. Here I give a recipe for making a bootable disk that can be adapted to whatever block device you may be using as a backup disk. This could be an internal or external hard disk, a USB key, etc.