stevenzhu
If you Google certbot nsone, the instructions are located on certbot website. https://certbot.eff.org/docs/using.html?highlight=dns
Quoted from the guide in question:
These plugins are not included in a default Certbot installation and must be installed separately.
Following the link to the plugin itself, there are no instructions for installation.
The plugin is either installed by script when installing from git, or it is installed from whatever repository I installed certbot from. The guides for installing the plugin from the git installed certbot (also often called certbot-auto) refer to non-existant folders indicating they are obsolete. The certbot ppa (where I installed certbot from) does not have the nsone plugin). see for yourself!
I must be missing something. I'll go back and re-read the document you sent stevenzhu, maybe I just overlooked it.