mirror of
https://github.com/coredns/coredns.git
synced 2025-10-31 10:13:14 -04:00
99 lines
2.3 KiB
Markdown
99 lines
2.3 KiB
Markdown
# trace
|
|
|
|
## Name
|
|
|
|
*trace* - enables OpenTracing-based tracing of DNS requests as they go through the plugin chain.
|
|
|
|
## Description
|
|
|
|
With *trace* you enable OpenTracing of how a request flows through CoreDNS. Enable the *debug*
|
|
plugin to get logs from the trace plugin.
|
|
|
|
## Syntax
|
|
|
|
The simplest form is just:
|
|
|
|
~~~
|
|
trace [ENDPOINT-TYPE] [ENDPOINT]
|
|
~~~
|
|
|
|
* **ENDPOINT-TYPE** is the type of tracing destination. Currently only `zipkin` and `datadog` are supported.
|
|
Defaults to `zipkin`.
|
|
* **ENDPOINT** is the tracing destination, and defaults to `localhost:9411`. For Zipkin, if
|
|
**ENDPOINT** does not begin with `http`, then it will be transformed to `http://ENDPOINT/api/v1/spans`.
|
|
|
|
With this form, all queries will be traced.
|
|
|
|
Additional features can be enabled with this syntax:
|
|
|
|
~~~
|
|
trace [ENDPOINT-TYPE] [ENDPOINT] {
|
|
every AMOUNT
|
|
service NAME
|
|
client_server
|
|
datadog_analytics_rate RATE
|
|
}
|
|
~~~
|
|
|
|
* `every` **AMOUNT** 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.
|
|
* `service` **NAME** allows you to specify the service name reported to the tracing server.
|
|
Default is `coredns`.
|
|
* `client_server` will enable the `ClientServerSameSpan` OpenTracing feature.
|
|
* `datadog_analytics_rate` **RATE** will enable [trace analytics](https://docs.datadoghq.com/tracing/app_analytics) on the traces sent
|
|
from *0* to *1*, *1* being every trace sent will be analyzed. This is a datadog only feature
|
|
(**ENDPOINT-TYPE** needs to be `datadog`)
|
|
|
|
## Zipkin
|
|
|
|
You can run Zipkin on a Docker host like this:
|
|
|
|
```
|
|
docker run -d -p 9411:9411 openzipkin/zipkin
|
|
```
|
|
|
|
Note the zipkin provider does not support the v1 API since coredns 1.7.1.
|
|
|
|
## Examples
|
|
|
|
Use an alternative Zipkin address:
|
|
|
|
~~~
|
|
trace tracinghost:9253
|
|
~~~
|
|
|
|
or
|
|
|
|
~~~ corefile
|
|
. {
|
|
trace zipkin tracinghost:9253
|
|
}
|
|
~~~
|
|
|
|
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:
|
|
|
|
~~~
|
|
trace http://tracinghost:9411/zipkin/api/v1/spans
|
|
~~~
|
|
|
|
Using DataDog:
|
|
|
|
~~~
|
|
trace datadog localhost:8126
|
|
~~~
|
|
|
|
Trace one query every 10000 queries, rename the service, and enable same span:
|
|
|
|
~~~
|
|
trace tracinghost:9411 {
|
|
every 10000
|
|
service dnsproxy
|
|
client_server
|
|
}
|
|
~~~
|
|
|
|
## See Also
|
|
|
|
See the *debug* plugin for more information about debug logging.
|