Guides for a System Administrator for Windows, Linux

How to set up replication on Hyper-V 2022 [step by step] with Active Directory off-domain self-signed certificates

19/09/202415/09/2024 by thelogh

Using Microsoft’s Hyper-V service with Active Directory Domain Hole Replication for authentication can be useful in the following scenarios: Disaster Recovery Scenarios: In disaster recovery scenarios, where replication of virtual machines between remote sites is necessary, the use of self-signed certificates can facilitate configuration without depending on constant domain connectivity or the loss of one. … Read more

How to fix high RAM usage during Defrag on Windows Server virtualized with QEMU

18/09/202408/09/2024 by thelogh

Using on a Linux virtualization system based on KVM and QEMU such as Proxmox VE 8.X with Microsoft operating systems, such as Windows 10, Windows 11, or Windows Server 2022, which during their operation sporadically for no apparent reason, can slow down and even block no longer responding for several minutes due to the Exhaustion … Read more

Backup and Restore Microsoft Windows and Microsoft Office License Activation Offline

19/09/202407/09/2024 by thelogh

For various reasons I needed to SAVE the license of an already activated on a PC or Server with a Microsoft Windows 10, Windows 11, or even the Microsoft Windows Server 2022 operating system, and then reinstall the operating system and restore the license, already activated in the previous installation, OFFLINE. Because there was no … Read more

Prevent “LONG” Disaster Recovery on “Hyper-Converged Ceph Cluster” with Proxmox V8, with “High Availability”

19/09/202429/03/2024 by thelogh

With a view to greater security and data protection, how do we implement additional security measures in the server room without destroying the budget of annual IT expenses?In the event of a serious accident (the OVH cloud fire in France in 2021, or the Godaddy fire also in France in 2024) in the Server Room, … Read more

Multidomain installation and configuration of HAProxy with WAF Coraza SPOA and OWASP ModSecurity Core Rule Set 4.0 – WordPress Rule Exclusions on Ubuntu Server 22.04 LTS

19/09/202422/10/2023 by thelogh

Welcome, after having integrated the Waf Coraza 3.0.1 with HAProxy v2.4.2 via the coraza-spoa component with my previous guide “Installation and configuration HAProxy v2.4.22 with WAF Coraza SPOA on Ubuntu Server 22.04 LTS” and the OWASP ModSecurity Core Rule Set (CRS) v4.0, let’s proceed with the simulation of a real multi-domain environment.We will configure a … Read more

Installation and configuration HAProxy v2.4.22 with WAF Coraza SPOA on Ubuntu Server 22.04 LTS

19/09/202415/10/2023 by thelogh

With the announcement of the end of development of ModSecurity in 2024, it is time to explore other alternatives.The solution recommended by OWASP is Coraza, compatible with CRS v3 and v4 rules. This guide aims to set up a waf on HAProxy v2.4.22 with a ready-to-use configuration, to get started for those who are not … Read more

Install Wazuh 4.5.2 Open Source XDR/SIEM on Ubuntu 22.04

19/09/202410/09/2023 by thelogh

I won’t spend much time explaining the functioning of a siem and the architecture of Wazuh, there is already this very well done article.So I will make a brief (as far as possible) preamble.In a company now more than ever, the importance of having a log collection and analysis system is necessary.There are many commercial … Read more

Configuring Ubuntu 22.04 with gmail or another email via Postfix

19/09/202409/09/2023 by thelogh

Let’s set up our Ubuntu 22.04 LTS Server for email notifications, configuring Postfix as relayhost(smarthost).So as to avoid that programs that use the default Ubuntu email system such as Wazuh, Nut, Smartmontool, script, etc., can send valid emails directly from our server and which are rightly reported as spam. All pre-configured configuration files are available … Read more