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Lympha technologies

Governance

18 articles

Data Centres & Green IT

Beyond PUE: measuring work, not just energy

PUE measures the facility, not the IT: the new work capacity metrics (PerfCPU for servers, TFLOPS for AI accelerators, terabytes for storage), work per unit of…

Practical Guides

What a proxy server is and how it works

What a proxy server is and how it works: the real-world uses (filtering, caching, security, privacy), the four steps of its job, the three main types…

Practical Guides

How to secure a VPS running Rocky Linux

Basic hardening of a Rocky Linux VPS (also valid for CentOS 7 and 8): checking the version, updates with dnf, a user in the wheel group, managing firewalld…

Practical Guides

Disabling password access for the SSH protocol

How to disable password access to the SSH service on a Linux VPS: backing up sshd_config, changing PasswordAuthentication, restarting and checking the service…

Practical Guides

Accessing a VPS securely via SSH from Linux or macOS

Secure SSH access to a VPS from Linux or macOS: how key-based authentication works (public and private keys), generating them with ssh-keygen, copying the key…

Practical Guides

Accessing a VPS securely via SSH from Windows

Secure SSH access to a VPS from Windows with PuTTY: why password authentication is vulnerable to brute force, how to generate the key pair with PuTTYgen,…

Practical Guides

How to secure a VPS running Ubuntu Linux

Basic security hardening for an Ubuntu Linux VPS, command by command: package updates, changing the SSH port, the ufw firewall, users with limited privileges,…

Practical Guides

How to install a GUI on your Ubuntu Server VPS

How to install a graphical interface on an Ubuntu Server VPS: updating the package library, the display manager (GDM3), the default desktop and the lighter…

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