coredns/man/coredns-debug.7

.\" generated with Ronn/v0.7.3
.\" http://github.com/rtomayko/ronn/tree/0.7.3
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.TH "COREDNS\-DEBUG" "7" "March 2019" "CoreDNS" "CoreDNS plugins"
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.SH "NAME"
\fIdebug\fR \- disables the automatic recovery upon a crash so that you\'ll get a nice stack trace\.
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.SH "DESCRIPTION"
Normally CoreDNS will recover from panics, using \fIdebug\fR inhibits this\. The main use of \fIdebug\fR is to help testing\. A side effect of using \fIdebug\fR is that \fBlog\.Debug\fR and \fBlog\.Debugf\fR will be printed to standard output\.
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.P
Note that the \fIerrors\fR plugin (if loaded) will also set a \fBrecover\fR negating this setting\.
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.SH "SYNTAX"
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.nf

debug
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.fi
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.P
Some plugin will debug log DNS messages\. This is done in the following format:
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.IP "" 4
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.nf

debug: 000000 00 0a 01 00 00 01 00 00 00 00 00 01 07 65 78 61
debug: 000010 6d 70 6c 65 05 6c 6f 63 61 6c 00 00 01 00 01 00
debug: 000020 00 29 10 00 00 00 80 00 00 00
debug: 00002a
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.fi
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.IP "" 0
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.P
Using \fBtext2pcap\fR (part of Wireshark) this can be converted back to binary, with the following command line: \fBtext2pcap \-i 17 \-u 53,53\fR\. Where 17 is the protocol (UDP) and 53 are the ports\. These ports allow wireshark to detect these packets as DNS messages\.
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.P
Each plugin can decide to dump messages to aid in debugging\.
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.SH "EXAMPLES"
Disable the ability to recover from crashes and show debug logging:
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.IP "" 4
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.nf

\&\. {
    debug
}
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.fi
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.IP "" 0
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.SH "ALSO SEE"
https://www\.wireshark\.org/docs/man\-pages/text2pcap\.html\.