Yum is already a very powerful tool. But it can still be enhanced through a plugin mechanism. Besides the fastestmirror plugin that allows you to get the new packages from the quickest mirror, there are other plugins adding new features to the…

Everybody thinks the password recovery procedure in RHEL 7 is simple. But it is not. To start with, there are several procedures spread all over the Internet. All are slightly different, all are supposed to run in all situations, with…

Last year there was a discussion whether delta rpms should be activated or not by default in the Fedora 22 distribution, whether this feature should be kept or simply removed. But do you know exactly what delta rpms are? How…

Sometimes to get some entropy you have to do strange things. Do you remember to make sudden mouse movements during SSH keys generation? Where do this entropy come from? Why does everything sometimes seem stopped? How does it work for…

At first, managing package groups seems easy. Package groups are a simple means to gather packages under a unique name. But, it’s not so simple! There are different types of package groups. There are at least two ways to call…

It’s now two years that this website exists. New tutorials have regularly been added. Lots of tutorials have seen their content increased through the “Additional Resources” section to provide advanced material to hungry readers. Besides learning new topics, keep an…

Until recently, SSL certificates were so expensive that you couldn’t set up your personal website only for fun. You had to have a good reason or a big wallet. This is not the case anymore. Now and until the letsencrypt.org…

If you use KVM for managing your virtual machines, you can sometimes run out of space in the /var/lib/libvirt/images directory, the default location for the RHEL/CentOS distributions. Because KVM knows the concept of thin provisioning through the qcow2 image format, the…

During the RHCSA exam, you need to go fast. When dealing with partition creation, you can’t afford to waste time, searching for information about the current configuration with almost obsolete command like fdisk -l displaying a very cryptic and mostly…

Even though the RHEL 6 distribution is not used for the main exams anymore (since February 28, 2015 for the RHCSA & RHCE exams, since July 22, 2015 for the LFCS & LFCE exams, except if you bought the exam…