Generate new client keys

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I while ago I created a OpenVPN server on Ubuntu 20.04.

I followed the digital ocean guide here : https://www.digitalocean.com/community/tutorials/how-to-set-up-and-configure-an-openvpn-server-on-ubuntu-20-04

Its been a while and I need to generate a new client. For some reason I can not find any trace of easy-rsa on the OpenVPN server. I have a funny feeling the installation was moved to a new install of ubuntu after the PKI was setup (hence why easy-rsa is missing)

From memory I should generate the request on the server, sign it with my CA machine (which I have) and then put it on the client.

Is there a way to get this running without breaking stuff?

I presume I can install easy-rsa again on the OpenVPN server? Then just generate a request and have it signed (Step 6 onwards on DO)

Thank you