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 (except 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⟩.