coredns/plugin/erratic/README.md
Miek Gieben 62317c3c14 update doc to not use the root zone for everything (#3288)
Update all documentation in the tree to use example.org as an example
configuration (in so far possible). As to get out of the just use "."
and fallthrough and things would be fine.

Signed-off-by: Miek Gieben <miek@miek.nl>
2019-09-19 06:17:53 -07:00

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.

Ready

This plugin reports readiness to the ready plugin.

Examples

example.org {
    erratic {
        drop 3
    }
}

Or even shorter if the defaults suits 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
    }
}

Also See

RFC 3849 and RFC 5737.