apache 2.2 - SSL with multiple servers and domains

Our current setup utilizes multiple VPS's along with multiple domains.

ex (And yes I know these IPs are all fake and unusable in reality. All for example..)

alpha.domain.com 66.555.555

beta.domain.com 66.555.554

charlie.domain.com 66.555.555

delta.domain.com 66.555.557

Let's assume the first 3 domains require SSL (https)

There's two challenges I have here. One is multiple domains, the other is multiple IP/servers. (Currently each is on their own server but in theory we could stack multiple IPs onto a single server also..either way same issue I believe..)

What is the best method of certificate for this? if alpha was our primary ecommerce site lets say I would think it should have its own unqiue SSL. But the others are secondary systems which primarily run crons and backend scripts that require Https for interaction. Is it possible to share one cert among multiple domains/servers/ips or is it that we should get a cert for each domain or each ip/server?

Answer

You could get a UCC cert that lists all those subdomains (as long as they are all under the same domain) and distribute it to all of those machines, or (if you have a lot of them) a wildcard cert for *.(your domain). Either of those can be used on multiple machines. SSL won't care about the IPs at all.

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