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75 lines
1.6 KiB
Markdown
75 lines
1.6 KiB
Markdown
# trace
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*trace* enables OpenTracing-based tracing of DNS requests as they go through the plugin chain.
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## Syntax
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The simplest form is just:
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~~~
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trace [ENDPOINT-TYPE] [ENDPOINT]
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~~~
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* **ENDPOINT-TYPE** is the type of tracing destination. Currently only `zipkin` is supported
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and that is what it defaults to.
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* **ENDPOINT** is the tracing destination, and defaults to `localhost:9411`. For Zipkin, if
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ENDPOINT does not begin with `http`, then it will be transformed to `http://ENDPOINT/api/v1/spans`.
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With this form, all queries will be traced.
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Additional features can be enabled with this syntax:
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~~~
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trace [ENDPOINT-TYPE] [ENDPOINT] {
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every AMOUNT
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service NAME
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client_server
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}
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~~~
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* `every` **AMOUNT** will only trace one query of each AMOUNT queries. For example, to trace 1 in every
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100 queries, use AMOUNT of 100. The default is 1.
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* `service` **NAME** allows you to specify the service name reported to the tracing server.
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Default is `coredns`.
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* `client_server` will enable the `ClientServerSameSpan` OpenTracing feature.
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## Zipkin
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You can run Zipkin on a Docker host like this:
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```
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docker run -d -p 9411:9411 openzipkin/zipkin
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```
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## Examples
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Use an alternative Zipkin address:
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~~~
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trace tracinghost:9253
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~~~
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or
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~~~ corefile
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. {
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trace zipkin tracinghost:9253
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}
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~~~
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If for some reason you are using an API reverse proxy or something and need to remap
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the standard Zipkin URL you can do something like:
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~~~
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trace http://tracinghost:9411/zipkin/api/v1/spans
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~~~
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Trace one query every 10000 queries, rename the service, and enable same span:
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~~~
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trace tracinghost:9411 {
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every 10000
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service dnsproxy
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client_server
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}
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~~~
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