COREDNS-ERRATIC(7) CoreDNS Plugins COREDNS-ERRATIC(7) NAME erratic - a plugin useful for testing client behavior. DESCRIPTION erratic returns a static response to all queries, but the responses can be delayed, dropped or truncated. The erratic plugin will respond to every A or AAAA query. For any other type it will return a SERVFAIL response (ex- cept AXFR). The reply for A will return 192.0.2.53 (RFC 5737 <https://tools.ietf.org/html/rfc5737>), for AAAA it returns 2001:DB8::53 (RFC 3849 <https://tools.ietf.org/html/rfc3849>). For an AXFR request it will respond with a small zone transfer. SYNTAX erratic { drop [AMOUNT] truncate [AMOUNT] delay [AMOUNT [DURATION]] } * drop: drop 1 per AMOUNT of queries, the default is 2. * truncate: truncate 1 per AMOUNT of queries, the default is 2. * delay: delay 1 per AMOUNT of queries for DURATION, the default for AMOUNT is 2 and the default for DURATION is 100ms. In case of a zone transfer and truncate the final SOA record isn't added to the response. READY This plugin reports readiness to the ready plugin. EXAMPLES example.org { erratic { drop 3 } } Or even shorter if the defaults suit you. Note this only drops queries, it does not delay them. example.org { erratic } Delay 1 in 3 queries for 50ms example.org { erratic { delay 3 50ms } } Delay 1 in 3 and truncate 1 in 5. example.org { erratic { delay 3 5ms truncate 5 } } Drop every second query. example.org { erratic { drop 2 truncate 2 } } SEE ALSO RFC 3849 <https://tools.ietf.org/html/rfc3849> and RFC 5737 <https://tools.ietf.org/html/rfc5737>. CoreDNS March 2026 COREDNS-ERRATIC(7)
NAME | DESCRIPTION | SYNTAX | READY | EXAMPLES | SEE ALSO
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