I want to isolate each service to its own Apache virtual machine under a single domain.
Maybe run Citadel on citadel.mydomain.com and maybe Wordpress on wordpress.mydomain.com and maybe Mastodon on mastodon.mydomain.com and maybe Nextcloud on nextcloud.mydomain.com. Each one would be a separate Apache virtual machine.
Is it possible to set this up with a single certificate? Or, how should I do this?
You can either have a single certificate, and use a copy of that on each viirtual server, or you could have separate certificate for each subdomain. The choice is yours.
You will need to verify each domain - which you could probably most easily do via a DNS challenge, alternatively you would have to have a way to add the token to each virtual server ( although this is still possible ).
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