.\" generated with Ronn/v0.7.3
.\" http://github.com/rtomayko/ronn/tree/0.7.3
.
.TH "COREDNS\-TRACE" "7" "January 2018" "CoreDNS" "CoreDNS plugins"
.
.SH "NAME"
\fItrace\fR \- enables OpenTracing\-based tracing of DNS requests as they go through the plugin chain\.
.
.SH "DESCRIPTION"
With \fItrace\fR you enable OpenTracing of how a request flows through CoreDNS\.
.
.SH "SYNTAX"
The simplest form is just:
.
.IP "" 4
.
.nf

trace [ENDPOINT\-TYPE] [ENDPOINT]
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.fi
.
.IP "" 0
.
.IP "\(bu" 4
\fBENDPOINT\-TYPE\fR is the type of tracing destination\. Currently only \fBzipkin\fR is supported and that is what it defaults to\.
.
.IP "\(bu" 4
\fBENDPOINT\fR is the tracing destination, and defaults to \fBlocalhost:9411\fR\. For Zipkin, if ENDPOINT does not begin with \fBhttp\fR, then it will be transformed to \fBhttp://ENDPOINT/api/v1/spans\fR\.
.
.IP "" 0
.
.P
With this form, all queries will be traced\.
.
.P
Additional features can be enabled with this syntax:
.
.IP "" 4
.
.nf

trace [ENDPOINT\-TYPE] [ENDPOINT] {
    every AMOUNT
    service NAME
    client_server
}
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.fi
.
.IP "" 0
.
.IP "\(bu" 4
\fBevery\fR \fBAMOUNT\fR will only trace one query of each AMOUNT queries\. For example, to trace 1 in every 100 queries, use AMOUNT of 100\. The default is 1\.
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.IP "\(bu" 4
\fBservice\fR \fBNAME\fR allows you to specify the service name reported to the tracing server\. Default is \fBcoredns\fR\.
.
.IP "\(bu" 4
\fBclient_server\fR will enable the \fBClientServerSameSpan\fR OpenTracing feature\.
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.IP "" 0
.
.SH "ZIPKIN"
You can run Zipkin on a Docker host like this:
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.IP "" 4
.
.nf

docker run \-d \-p 9411:9411 openzipkin/zipkin
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.fi
.
.IP "" 0
.
.SH "EXAMPLES"
Use an alternative Zipkin address:
.
.IP "" 4
.
.nf

trace tracinghost:9253
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.fi
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.IP "" 0
.
.P
or
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.IP "" 4
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.nf

\&\. {
    trace zipkin tracinghost:9253
}
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.fi
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.IP "" 0
.
.P
If for some reason you are using an API reverse proxy or something and need to remap the standard Zipkin URL you can do something like:
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.IP "" 4
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.nf

trace http://tracinghost:9411/zipkin/api/v1/spans
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.fi
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.IP "" 0
.
.P
Trace one query every 10000 queries, rename the service, and enable same span:
.
.IP "" 4
.
.nf

trace tracinghost:9411 {
    every 10000
    service dnsproxy
    client_server
}
.
.fi
.
.IP "" 0