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contrib: Update DNS table description

This commit is contained in:
Daniel Nephin 2021-06-23 12:29:02 -04:00
parent f87821cb63
commit d25403bb6f
1 changed files with 22 additions and 15 deletions
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contributing/service-discovery/dns.md
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@ -24,19 +24,26 @@ the DNS protocol can be found in the RFCs: [RFC 1035], [RFC 6891], [RFC 2782], a
The DNS interface is implemented as a DNS server using [miekg/dns] and the handlers for The DNS interface is implemented as a DNS server using [miekg/dns] and the handlers for
requests are in `agent/dns.go`. requests are in `agent/dns.go`.
The following table describe the current DNS behaviour depending on the dns query kind (node, service...), and the query type (A/AAAA, SRV...)
| | service | connect (enterprise) | ingress (enterprise) | node | query | addr |
|----------------|-------------------------|-------------------------|-------------------------|------------------------|-----------------|------------------------------|
| TypeSOA | Supported | Supported | Supported | Supported | Supported | Supported |
| TypeNS | Supported | Supported | Supported | Supported | Supported | Supported |
| TypeAXFR | Not Implemented | Not Implemented | Not Implemented | Not Implemented | Not Implemented | Not Implemented |
| TypeA/TypeAAAA | Supported | Supported | Supported | Supported | | Supported |
| TypeANY | Supported (return A) | Supported (return A) | Supported (return A) | Supported | | Supported (return A) |
| TypeCNAME | Supported (node cname) | Supported (node cname) | Supported (node cname) | Supported (node cname) | | return empty with A as extra |
| TypeOPT | Supported (node OPT) | Supported (node OPT) | Supported (node OPT) | Supported (node OPT) | | return empty with A as extra |
| TypePTR | Supported (node PTR) | Supported (node PTR) | Supported (node PTR) | Supported (node PTR) | | return empty with A as extra |
| TypeSRV | Supported (service SRV) | Supported (service SRV) | Supported (service SRV) | No error but empty | | return empty with A as extra |
| TypeTXT | Answer A record (????) | Answer A record (????) | Answer A record (????) | Supported | | return empty with A as extra |
[miekg/dns]: https://github.com/miekg/dns [miekg/dns]: https://github.com/miekg/dns
## DNS Queries and Records
The DNS interface handles queries where OPCODE=0 (standard query). The following table describe the current
DNS behaviour for different record types and domain names. The Domain names (along the
top) are always in the form `<prefix>.<name in table>.<domain>`, where `domain` is
generally documented as `consul` but can be set using the `domain` or `alt_domain` config
fields. The `prefix` is an identifier (service name, node name, prepared query name, etc).
| Type | service | connect | ingress | node | query | addr |
|---------|-------------------------|-------------------------|-------------------------|------------------------|-----------------|------------------------------|
| SOA | Supported | Supported | Supported | Supported | Supported | Supported |
| NS | Supported | Supported | Supported | Supported | Supported | Supported |
| AXFR | Not Implemented | Not Implemented | Not Implemented | Not Implemented | Not Implemented | Not Implemented |
| A/AAAA | Supported | Supported | Supported | Supported | | Supported |
| ANY | Supported (return A) | Supported (return A) | Supported (return A) | Supported | | Supported (return A) |
| CNAME | Supported (node cname) | Supported (node cname) | Supported (node cname) | Supported (node cname) | | return empty with A as extra |
| OPT | Supported (node OPT) | Supported (node OPT) | Supported (node OPT) | Supported (node OPT) | | return empty with A as extra |
| PTR | Supported (node PTR) | Supported (node PTR) | Supported (node PTR) | Supported (node PTR) | | return empty with A as extra |
| SRV | Supported (service SRV) | Supported (service SRV) | Supported (service SRV) | No error but empty | | return empty with A as extra |
| TXT | Answer A record (????) | Answer A record (????) | Answer A record (????) | Supported | | return empty with A as extra |