Until now there was almost no book about KVM in English. This lack is fulfilled. Three people, working for Red Hat, have published a book called Mastering KVM Virtualization in August and this book provides an extensive coverage of this technology. So,…
From RHEL 7.0 to RHEL 7.2, Firewalld didn’t really evolve (v0.3.9.7 -> v0.3.9.14). It was mainly a matter of bug fixes. As usual with RedHat, Systemd already showed it, new Firewalld features are triggered by backport difficulties: as new bugs are found, fixes…
Yesterday, Red Hat announces the official release of RHEL 7.3. To know more about this new version you can read a summary of the RHEL 7.3 changes or the RHEL 7.3 Release Notes. Be careful when upgrading to RHEL 7.3,…
It’s more than three months after the event that RedHat publishes some new videos. And we are talking about 60 videos! People like me, who were disappointed by the lack of good technical videos right after the event, can now…
Note: This is a translation of an article about the experience of a French guy following RedHat hands-on labs and taking the RHCE exam (source in French here). This document was published on October the 12th 2016 and is under…
Last week the Systemd.conf conference took place in Berlin with a lot of interesting presentations. Among these videos, Davide Cavalca from Facebook discussed Systemd deployment at scale (41min). Besides the motivation of the migration from CentOS 6 to 7, he…
Since RHEL 7.0, Firewalld has been subject to controversies. Newcomers find it easy to work with because it masks complexity: ports used by protocols are stored in configuration files, network masquerading is started through the simple –add-masquerade option, permanent and temporary…
Troubleshooting a systemd service can be tricky. Because the Restart=always directive is sometimes set in the unit file, you don’t know if a service is running fine or if it is stopping and restarting all the time. The systemctl status…
As Redhat just announced the RHEL 7.3 Beta release, this week marks the third anniversary of the website creation. Tutorials are regularly updated even though writing of new ones has seriously slowed down due to lack of time. I hope…
When you are about to deploy an application, you’ve got a lot of problems to solve. How are you going to deal with backups, monitoring, filtering admin connections? One of these problems concerns the management of system and application messages.…
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