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How detect that an email sent by your application has been opened

Currently there is no 100% reliable solution, but the most “reliable” solution is the one used by email marketing platforms such as MailChimp, MailJet, SendInBlue and so on. Thus it is a question of sending an email in HTML format… Continue Reading →

==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ====

You are on a CentOS server, connected as a non-root user, for example here as the user owner of the tomcat installation folder, let’s call it mytomcatuser. And when you want to stop tomcat using the systemd tomcat.service then you… Continue Reading →

Security headers in your web site

You can scan your website here (don’t forget to check ‘hide result’): Then add the following code to your .htaccess or directly inside de server configuration file if you have access to it: Now it’s better:

Detect Active Directory users password expiration and send a reminder email

The following code must be executed as administrator on your active directory server:

expdp / impdp causes Oracle segmentation fault (core dumped)

This error is caused because of a malformed command line impdp / expdp. Also it depends on your oracle server version, in recent oracle servers you will probably have less problem with the pattern combination. For instance you have several… Continue Reading →

Rocky Linux: remove remi’s php package

CentOS-8 – AppStream Error: Failed to download metadata for repo ‘AppStream’: Cannot prepare internal mirrorlist: No URLs in mirrorlist

Solution to CentOS 8 AppStream Error As explained here, Centos mirrors have been migrated to Then the solution is: After this you can again use the yum command but you won’t received recent updates because Centos mirrors are not… Continue Reading →

Shell script function particularities: declare local variables, run in background, …

Run a function in background and get its process ID Instead of creating another script that you call from your primary script you can simply declare a function (inside your primary script or inside another file that you include), and… Continue Reading →

Install ansible 5 inside a python virtual environment with python 3.10.4

Note: The following commands are for RockyLinux, RedHat, CentOS, on other distros it will be almost the same. I’ve made the choice to connect to a user called ansible, and inside his home directory I’ve created a directory called ansible,… Continue Reading →

Python and virtual environments on Linux OS

Install python 3.10.4 from source on Rocky Linux or CentOS The following commands are executed as a root user. Virtual Python environment You can install several virtual python environments on your Linux OS. It will allow you to deploy a… Continue Reading →

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