CirrusI would to have an ephemeral node resolve an MX record. There is no A record associated. The F5 fails to resolve the node currently but I can successfully resolve it to the same DNS server if I ask it for an MX record.
Is it possible to associate an MX record instead of A?
Thank you.
EmployeeNo, this won't work. When you are asking for an MX record, you are saying "What is the hostname for the mail server that services this domain name". It returns a value, which is mapped to an IP address as normal. So if you say "Give me the MX record for internal.f5.com" It might return "inmail.f5.com", but inmail.f5.com would map to an IP via a regular A record. So in my fictional example, it might look like this:
internal.f5.com
MX 10 inmail.f5.com
inmail.f5.com IN A 1.2.3.4
internal.f5.com in this example has no A record, but inmail.f5.com does. So the MX lookup for internal.f5.com would eventually return 1.2.3.4, which is the IP associated with inmail.f5.com.
So you couldn't use the MX as the FQDN for an ephemeral node.