Upgrading a Vagrant VirtualBox development server provisioned using chef-solo encountered the error `Vagrant could not detect Chef on the guest!` and this is how I fixed it.

LetsEncrypt is a free SSL Certificate provider that has helped secure millions of websites and APIs. The expiry of the DST Root CA X3 spelled trouble for some clients when connecting to endpoints certified by LE.

OpenVPN is the leading VPN technology behind most VPN providers in the world. It enables you to securely browse the web without revealing your location. This post discusses how you can easily install OpenVPN server on Ubuntu for personal use.

Instructions to install Apache Solr, the popular search framework powering medium to large scale internet sites, in an Ubuntu 20.04 server. Includes helpful commands to manage the service.

Ubuntu 12.04 based OpenSSL v1.0.1 clients do not have the relatively new ISRG_Root_X1 certificate and to survive the expiry of DST_Root_CA_X3 follow the following steps.