[PLUG] certificates, URLs, IP addresses

[Russell Senior]

On Sun, Mar 22, 2020 at 9:00 PM Keith Lofstrom <keithl at kl-ic.com> wrote:

> MY FIRST QUESTION IS:  can multiple domains and multiple
> SSL certificates share one IP address?  I can rent more
> IP addresses, but I hope to avoid complication and cost.
>

The way I did it is to create an SSL certificate with multiple domain
names. That works.


>
> NEXT QUESTION:  what is a good ten page summary of how to
> set up and maintain SSL certificates in the simplest way?
>

Look for LetsEncrypt and/or certbot documentation for multiple domain names.


>
> Ditto for DKIM, and configuring postfix for both.
>
> - - - - - - - - - - background - - - - - - - - - - - -
>
> Over the years, I've accumulated many domains and URLs
> on three web servers and multiple companies.  I've spent
> a few days simplifying and debugging all that.
>
> After transferring dirvish to a new maintainer, I've
> consolidated everything else onto one offsite virtual
> server with one IP address.  14 domain names point at
> that IP address, all with the same domain registrar.
>
> About half of the domains send email.  For example, the
> wiki websites notify page authors that their page has
> been modified.
>
> Without SSL certificates, some of the major email services
> (like gmail) automatically route my outbound emails to user
> spam folders.  Not helpful.
>
> I don't really understand SSL certificates, or DKIM, but
> those can establish the bona fides of my mail server with
> the big services.  Both my name registrar and my virtual
> server hosting provider offer free certs ... I think.
>
> If I need more information, I can websearch the buzzwords
> in the summaries, or pester the rest of you.  The better
> the summaries, the less the pestering.
>
> Keith
>
> --
> Keith Lofstrom          keithl at keithl.com
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