If you do not have https configured already (you do if you have done a standard install recently) see Setting up Let’s Encrypt as your first step,
Step 1 - letsencrypt
It’s pretty simple really, add something like the following to your
app.yml hooks section:
after_ssl: - replace: filename: "/etc/runit/1.d/letsencrypt" from: /--keylength/ to: "-d second-domain.com -d www.second-domain.com -d other-domain.com -d www.other-domain.com --keylength"
If you just want to have https configured for a second domain that will redirect to the correct one (e.g., your forum is
community.example.com and you want people who visit
https://forum.example.com be redirected without a certificate error), that’s all you need.