Intro Linux Commands for DNS

DIG is used to query information about various DNS records, including host addresses, mail exchganges, and name servers, eg. “dig”. Install dig on Linux (Optional) Most modern Linux systems include the dig command. Verify that it’s installed by checking the software version. To do so, open a command line and enter the following: dig … Read more

Personal Privacy and Security Tips

As a professionnal system administrator, I have the highest level of access possible. Because I have this level of access someone could try to hack me or might threaten me to get some information I have access to. I don’t want to discuss my threat model, but I will give you some tips to get … Read more

What’s the best Linux distro for you?

First, let’s clarify something: Linux is not an operating system! Linux is a kernel, to get an operating system, you need to choose a distrubution which will pack Linux as the kernel. There’s also other Unix-like operating systems which will pack BSD as the kernel instead of Linux. Both are good, but they have differents … Read more

How to Delete Certbot Certificate by Domain Name (Let’s Encrypt)

First, list your certificates by running this command : Here’s an immediate way to delete a Certbot certificate by including the domain name in the command like this: To avoid problems, you should also delete the Apache configuration associated with this certificate, here’s an exemple for exemple.conf : This could be useful if the domain … Read more

How to update GLPI to latest version (2020)

Note As for every update process, you have to backup some data before processing any upgrade: backup your database; backup your files directory; backup your configuration. I will provide you with the information to update GLPI to the latest version. In this exemple, I will be upgrading from GLPI version 9.5.1 to 9.5.2. I will … Read more