How to configure local two-factor authentication with U2F on Ubuntu 19.10

This guide covers how to secure a local Linux login using the U2F feature on YubiKeys and Security Keys. This does not work with remote logins via SSH or other methods. The commands in the guide are for an Ubuntu (or Ubuntu based) system, but the instructions can be adapted for any distribution of Linux.

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How to install and configure OpenVPN on Debian 10

OpenVPN is a free and open source VPN solution. VPN solution. As a result VPN allow to secure your data communications. It implements OSI layer 2 or 3 secure network extension using the SSL/TLS protocol. A VPN allows your yo connect securely to an insecure public network such as WiFi network at the airport or hotel. Almost companies also use VPN to access corporate or enterprise or home server resources. You can bypasss geo-blocked site and increase your privacy or safety online.

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How to upgrade PHP 5.6 to PHP 7.3 on CentOS VestaCP

Introduction

CentOS is a Linux distribution that provides a free, enterprise-class, community-supported computing platform functionally compatible with its upstream source, Red Hat Enterprise Linux (RHEL).

The Vesta Control Panel is a free, open source control panel with website, email, database, and DNS functionalities. In this tutorial you will upgrade the control panel PHP 5.6 to PHP 7.3 on CentOS server.

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How to login SSH with .ppk file on Ubuntu terminal

You can convert a .ppk file in Ubuntu with installing putty-tools. So

sudo apt-get install putty-tools

Then youn can convert the .ppk file with puttygen to OpenSSH’s format like so:

puttygen <the_key.ppk> -O private-openssh -o <new_openssh_key>.key