I’ve got LAMP running on Ubuntu 14.04 and almost a year ago I installed SSL (TLS 1.2) certificate for my web server, so my site would only run under HTTPS protocol. On October 8 the certificate expires. And from now on I want to install and use Let’s Encrypt. How to get rid of the old cert? I mean, it’s
probably NOT a good idea to use two of them side by side. So what’s the correct order of things? First, to delete the old files? I placed .crt and root_bundle.crt files in /etc/ssl/certs directory and a .key file in /etc/ssl/private directory. Other than physically deleting those files, do I have to run any specific command in the terminal or something? And then to install Let’s Encrypt? New cert from what I understood shouldn’t be put like a file, it’s somehow automatically works. Not the way it was with the old one…
Also in a file /etc/apache2/sites-available/000-default.conf there’re 3 references to my old cert’s files:
So what to do with those links? To comment out them? Or update with a new files that would be created by Let’s Encrypt etc.?
In short, too many things are not clear. There’re plenty of tutorials of how to install and use Let’s Encrypt, but I haven’t found even a single one in which in details described how to transition from an old regular cert to Let’s Encrypt cert.