feat: Front Authoritative queries with dnsdist - #125
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PowerDNS Authoritative has no dnstap; query metering needs a Frame Stream from dnsdist. Bind dnsdist on :53, keep Auth on loopback :5301, and emit dnstap to /run/dnsdist/dnstap.sock for Vector.
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@scotwells & @0xmc could you have a quick browse over this please? |
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Summary
Public DNS queries currently hit PowerDNS Authoritative, which cannot emit dnstap. The in-pod recursor can, but it only expands ALIAS records on loopback and never sees those queries. Nothing on the serving path produces a stream Vector can consume.
dnsdist now binds UDP and TCP port 53 and forwards to Authoritative on 127.0.0.1:5301. Recursor stays on 5300. The pdns-auth Service still targets port 53, so in-cluster lookups do not change.
dnsdist writes dnstap to
/run/dnsdist/dnstap.sockas a Frame Stream client. There is no listener in the pod yet. dnsdist reconnects until Vector (or another fstrm process) binds the socket. Query billing is not in this change.Writer and edge share this StatefulSet, so both get the same query path. Authoritative no longer listens on the pod IP, and it runs as uid 953 now that it does not bind a privileged port.
Test plan
dig @pdns-auth.dns-agent-system.svc.cluster.local/run/dnsdist/dnstap.sockhas no listenerNotes for reviewers
Vector still needs to listen on
/run/dnsdist/dnstap.sock. dnstap has qname, rcode, and type. It does not have a Milo project or DNSZone UID.Related to #49