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…

With the upcoming RHEL 7.2 version, Systemd should be upgraded, going from version 208 to 219. This Systemd upgrade decision was taken according to Lukáš Nykrýn from Red Hat because “it is really difficult and risky to backport patches from newer version…

Here are some of the main 2015 Red Hat Summit announcements: the upcoming RHEL 7.2 release will bring SCAP profiles into the installation process, cryptography enhancements, kernel patching, performance gains (network and system), a new predictable cycle for software updates,…

The other day I was looking at some Systemd service properties with the systemctl show command. One of them, CPUShares, got my interest. Caution: The following tutorial shouldn’t be run on a production server! The CPU will be used at…

There are some activities on the CentOS 7 side: after a CentOS 7 (1503) alpha candidate for AArch64, there is now a CentOS 7 (1503) beta candidate for AArch64 platforms, a CentOS 7 (1503) beta candidate for i686 platforms has…

Many people don’t figure out why a Systemd service can be masked. They understand the need to enable it at boot and start it but why masking it? Back to basics, a Systemd service can be: manually started with the…

When a service doesn’t run as you would like, when you want to change its default configuration, Systemd offers you several options. Firstly, you can copy the standard unit file from the /usr/lib/systemd/system directory into the /etc/systemd/system directory and then…