d998aa6c25
* plugin/erratic: add axfr support Add support for axfr. This to fix and test long standing axfr issues that are hard to test if we don't support it directly in coredns. The most intriguing feature is withholding the last SOA from a response so the client needs to wait; drop (no reply) and delay is also supported. All TTLs are set to zero. Add simple tests that checks if first record is a SOA. Signed-off-by: Miek Gieben <miek@miek.nl> * more test coverage Signed-off-by: Miek Gieben <miek@miek.nl>
1.8 KiB
erratic
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. The reply for A will return 192.0.2.53 (see RFC 5737, for AAAA it returns 2001:DB8::53 (see RFC 3849) and for an AXFR request it will respond with a small zone transfer.
erratic can also be used in conjunction with the autopath plugin. This is mostly to aid in testing.
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.
Health
This plugin implements dynamic health checking. For every dropped query it turns unhealthy.
Examples
. {
erratic {
drop 3
}
}
Or even shorter if the defaults suits you. Note this only drops queries, it does not delay them.
. {
erratic
}
Delay 1 in 3 queries for 50ms
. {
erratic {
delay 3 50ms
}
}
Delay 1 in 3 and truncate 1 in 5.
. {
erratic {
delay 3 5ms
truncate 5
}
}
Drop every second query.
. {
erratic {
drop 2
truncate 2
}
}