This is a very interesting article that describes in detail all the required actions a sysadmin should perform in order to effectively remove a user from a Linux system. This checklist mainly focuses on security, covering all aspects of the removal procedure, from the user’s documents to mail aliases, cronjobs, user’s processes etc. Read the…
I always wanted to learn how to set up a version control system, especially SVN since everybody tend to move to that system. This howto will illustrate a way to install and configure Subversion and websvn on a Debian server with the following features: multiple repository Subversion access to the repositories via WebDAV (https, https)…
ModSecurity is an Apache module which adds an extra layer of security by analyzing client requests before they are processed by Apache and, furthermore, by analyzing server responses after a request has been processed. This article intends to be a ModSecurity overview and to provide the reader with the basic knowledge about the most important…
Repairing the GRUB installation is a very usual task for many Linux users. There are many excellent articles on this topic on the net. This small article intends to be a summary of them and to serve as a small reference for those who do not care about the details. Some links to external relative…
Sometimes, especially when you create your own RPMs, it is extremely useful to keep them in a local YUM repository. The advantage of this is that, when you install a package, YUM automatically resolves any dependencies, not only by downloading the necessary packages from the other repositories you might have in you list, but also…
This article describes how to become your own Certificate Authority (CA) and issue your own server certificates. Be advised that noone else, apart from you, your internal network’s people or your friends, will or should trust this kind of certificates (self-signed). These are intended only for providing secure communication with your own services or for testing purposes.
This article describes in brief how to configure VNC server instances for one or multiple users on a remote machine, how to use VNC to start graphical applications on boot and finally how to enhance security by connecting to the server through encrypted SSH tunnels.
In this article I describe how to configure the SSH server, so that users authenticate using keys, how to generate DSA keys using ssh-keygen, how to configure ssh-agent and finally how to use ssh-add to manage cached passphrases.
This is a short article about the most common practices in user and group management from the command line. The information is specific to Fedora Core and Red Hat based distros, but would do for any distribution probably with slight differences in the command options.
Can a network card have multiple IPs assigned to it? The answer is absolutely yes! Some times, for example when you run several servers on a machine or when you need IP-based Apache virtualhosts, it is useful to bind a server or a virtualhost on its own IP address. I am not going to get…