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126 lines
2.2 KiB
Groff
126 lines
2.2 KiB
Groff
.\" generated with Ronn/v0.7.3
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.\" http://github.com/rtomayko/ronn/tree/0.7.3
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.
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.TH "COREDNS\-ERRATIC" "7" "October 2018" "CoreDNS" "CoreDNS plugins"
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.
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.SH "NAME"
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\fIerratic\fR \- a plugin useful for testing client behavior\.
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.
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.SH "DESCRIPTION"
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\fIerratic\fR returns a static response to all queries, but the responses can be delayed, dropped or truncated\. The \fIerratic\fR 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 \fIhttps://tools\.ietf\.org/html/rfc5737\fR, for AAAA it returns 2001:DB8::53 (see RFC 3849 \fIhttps://tools\.ietf\.org/html/rfc3849\fR) and for an AXFR request it will respond with a small zone transfer\.
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.
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.P
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\fIerratic\fR can also be used in conjunction with the \fIautopath\fR plugin\. This is mostly to aid in testing\.
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.
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.SH "SYNTAX"
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.
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.nf
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erratic {
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drop [AMOUNT]
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truncate [AMOUNT]
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delay [AMOUNT [DURATION]]
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}
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.
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.fi
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.
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.IP "\(bu" 4
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\fBdrop\fR: drop 1 per \fBAMOUNT\fR of queries, the default is 2\.
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.
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.IP "\(bu" 4
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\fBtruncate\fR: truncate 1 per \fBAMOUNT\fR of queries, the default is 2\.
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.
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.IP "\(bu" 4
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\fBdelay\fR: delay 1 per \fBAMOUNT\fR of queries for \fBDURATION\fR, the default for \fBAMOUNT\fR is 2 and the default for \fBDURATION\fR is 100ms\.
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.
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.IP "" 0
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.
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.P
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In case of a zone transfer and truncate the final SOA record \fIisn\'t\fR added to the response\.
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.
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.SH "HEALTH"
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This plugin implements dynamic health checking\. For every dropped query it turns unhealthy\.
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.
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.SH "EXAMPLES"
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.
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.nf
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\&\. {
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erratic {
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drop 3
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}
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}
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.
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.fi
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.
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.P
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Or even shorter if the defaults suits you\. Note this only drops queries, it does not delay them\.
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.
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.IP "" 4
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.
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.nf
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\&\. {
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erratic
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}
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.
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.fi
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.
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.IP "" 0
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.
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.P
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Delay 1 in 3 queries for 50ms
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.
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.IP "" 4
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.
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.nf
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\&\. {
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erratic {
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delay 3 50ms
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}
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}
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.
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.fi
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.
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.IP "" 0
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.
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.P
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Delay 1 in 3 and truncate 1 in 5\.
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.
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.IP "" 4
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.
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.nf
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\&\. {
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erratic {
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delay 3 5ms
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truncate 5
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}
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}
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.
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.fi
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.
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.IP "" 0
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.
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.P
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Drop every second query\.
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.
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.IP "" 4
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.
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.nf
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\&\. {
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erratic {
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drop 2
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truncate 2
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}
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}
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.
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.fi
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.
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.IP "" 0
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.
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.SH "ALSO SEE"
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RFC 3849 \fIhttps://tools\.ietf\.org/html/rfc3849\fR and RFC 5737 \fIhttps://tools\.ietf\.org/html/rfc5737\fR\.
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