Hello!

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. They have pretty good tutorials on how to use Let's Encrypt, so (hopefully) I won't have any issues with it. But I don't know what to do now. Must I wait till after my old cert expires? Or should I go ahead and proceed with Let's Encrypt installation ASAP? If the latter, then another question arises. 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. In short, too many things I don't understand.

You don't need to wait until your existing cert expires. You can go LetsEncrypt at any time. As for "getting rid" of your old cert, just remove the entries in your apache config and replace then with the LetsEncrypt ones.

1 members found this post helpful.

Okay, thanks!

Or, if you prefer, "comment them out, for now." Then, move the "old" certificates to some "nearby" location, so that you know that they won't continue to be referenced, but where you can get them back if ... ... "something goes wrong."