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Using Let’s Encrypt and Certbot to automate the creation of certificates for OpenVPN

Recently at Planet 9 Energy , I had to setup a VPN access to secure some of our internal services. One of the requirements was to make the provisioning easy to reproduce over multiple environments, so we ended up playing a bit with Terraform, while obviously adopting OpenVPN for the VPN server. Another important requirement was to expose the OpenVPN web interface (also called Access Server) using an SSL, which I was expecting to be one of the most challenging things to automate, instead, it turned out to…