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karlschriek avatar karlschriek commented on July 18, 2024

A bit more diagnostic information:

The Azure DNS zone is "mysubdomain.mydomain.net", so the routing above happens an A-record set on "@".

If I instead change the istio VirtualService to have a DNS of "foobar.mysubdomain.mydomain.net", the behaviour changes and is correct, and the "mysubdomain.mydomain.net" there are the following records:

a-foobar A
foobar A
foobar TXT

time="2024-06-18T09:06:33Z" level=debug msg="Found 1 Azure DNS zone(s)."
time="2024-06-18T09:06:33Z" level=debug msg="Found A record for 'mydomain.mysubdomain.net' with target 'xxx.xxx.xxx.xxx'."
time="2024-06-18T09:06:33Z" level=debug msg="Failed to extract targets for 'mydomain.mysubdomain.net' with type 'NS'."
time="2024-06-18T09:06:33Z" level=debug msg="Found TXT record for 'mydomain.mysubdomain.net' with target '\"heritage=external-dns,external-dns/owner=default,external-dns/resource=virtualservice/foobar/foobar\"'."
time="2024-06-18T09:06:33Z" level=debug msg="Found TXT record for 'a-foobar.mydomain.mysubdomain.net' with target '\"heritage=external-dns,external-dns/owner=default,external-dns/resource=virtualservice/foobar/foobar\"'."
time="2024-06-18T09:06:33Z" level=debug msg="Found A record for 'foobar.mydomain.mysubdomain.net' with target 'xxx.xxx.xxx.xxx'."
time="2024-06-18T09:06:33Z" level=debug msg="Found TXT record for 'foobar.mydomain.mysubdomain.net' with target '\"heritage=external-dns,external-dns/owner=default,external-dns/resource=virtualservice/foobar/foobar\"'."
time="2024-06-18T09:06:33Z" level=debug msg="Endpoints generated from VirtualService: foobar/foobar: [foobar.mydomain.mysubdomain.net 0 IN A  xxx.xxx.xxx.xxx []]"

So the issue can be narrowed down to when routing to "@".

from external-dns.

dongjiang1989 avatar dongjiang1989 commented on July 18, 2024

Maybe by design. @ as for root

func (p *AzureProvider) recordSetNameForZone(zone string, endpoint *endpoint.Endpoint) string {
	// Remove the zone from the record set
	name := endpoint.DNSName
	name = name[:len(name)-len(zone)]
	name = strings.TrimSuffix(name, ".")

	// For root, use @
	if name == "" {
		return "@"
	}
	return name
}

ref: https://learn.microsoft.com/en-us/azure/dns/dns-zones-records#record-names

from external-dns.

karlschriek avatar karlschriek commented on July 18, 2024

Well, yes. In DNS you denote the root zone with an "@", so... I am not sure what you are getting at?

external-dns is setting the dns records correctly. The problem is that is that when the record is for the root it updates it every time, instead of just logging that it found an existing record and will do nothing.

from external-dns.

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