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docs: add documentation for failover rcode

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Cuong Manh Le
2022-12-15 00:00:05 +07:00
committed by Cuong Manh Le
parent ccada70e31
commit d2c47ba523
1 changed files with 17 additions and 0 deletions
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docs/config.md
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@@ -300,4 +300,21 @@ Above policy will:
- type: array of rule
### failover_rcodes
For non success response, `failover_rcodes` allows the request to be forwarded to next upstream, if the response `RCODE` matches any value defined in `failover_rcodes`. For example:
```toml
[listener.0.policy]
name = "My Policy"
failover_rcodes = ["NXDOMAIN", "SERVFAIL"]
networks = [
{"network.0" = ["upstream.0", "upstream.1"]},
]
```
If `upstream.0` returns a NXDOMAIN response, the request will be forwarded to `upstream.1` instead of returning immediately to the client.
See all available DNS Rcodes value [here](rcode_link).
[toml_link]: https://toml.io/en
[rcode_link]: https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-6