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70 lines
1.6 KiB
Groff
70 lines
1.6 KiB
Groff
.\" Generated by Mmark Markdown Processer - mmark.miek.nl
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.TH "COREDNS-DEBUG" 7 "December 2019" "CoreDNS" "CoreDNS Plugins"
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.SH "NAME"
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.PP
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\fIdebug\fP - disables the automatic recovery upon a crash so that you'll get a nice stack trace.
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.SH "DESCRIPTION"
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.PP
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Normally CoreDNS will recover from panics; using \fIdebug\fP inhibits this. The main use of \fIdebug\fP is
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to help in testing. A side effect of using \fIdebug\fP is that \fB\fClog.Debug\fR and \fB\fClog.Debugf\fR messages
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will be printed to standard output.
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.PP
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Note that the \fIerrors\fP plugin (if loaded) will also set a \fB\fCrecover\fR, negating this setting.
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.SH "SYNTAX"
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.PP
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.RS
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.nf
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debug
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.fi
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.RE
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.PP
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Some plugins will send debug log DNS messages. This is done in the following format:
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.PP
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.RS
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.nf
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debug: 000000 00 0a 01 00 00 01 00 00 00 00 00 01 07 65 78 61
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debug: 000010 6d 70 6c 65 05 6c 6f 63 61 6c 00 00 01 00 01 00
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debug: 000020 00 29 10 00 00 00 80 00 00 00
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debug: 00002a
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.fi
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.RE
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.PP
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Using \fB\fCtext2pcap\fR (part of Wireshark), this can be converted back to binary, with the following
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command line: \fB\fCtext2pcap -i 17 -u 53,53\fR, where 17 is the protocol (UDP) and 53 are the ports. These
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ports allow Wireshark to detect these packets as DNS messages.
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.PP
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Each plugin can decide whether to dump messages to aid in debugging.
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.SH "EXAMPLES"
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.PP
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Disable the ability to recover from crashes and show debug logging:
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.PP
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.RS
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.nf
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\&. {
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debug
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}
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.fi
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.RE
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.SH "ALSO SEE"
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.PP
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https://www.wireshark.org/docs/man-pages/text2pcap.html
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\[la]https://www.wireshark.org/docs/man-pages/text2pcap.html\[ra].
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