I have a server on Linode with 1-click install (Debian 9) .
After that I install Lets Encrypt by following Certbot official procedures.
Everything works ok without any error. However, when i add another domain to the same server, it get warning by saying this new site is "Not Secure"
By checking the following files
I can’t find the official docs for add new domains on certbot.eff.org
What i found the most likely to be the correct way to add new domains are this command line
sudo -H ./letsencrypt-auto certonly --standalone -d my2nddomain.com -d www.my2nddomain.com
However, i don’t dare to test it yet because I am afraid it may get error and cause the whole server not working. By then, my 1stdomain will also be effected.
Anyone can advice ?