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e261ac1a6e
Limit the options in both errors and log middleware, just output to stdout and let someone else (journald,docker) care about where to route the logs. This removes syslog and logging to a file. Fixes #573 #602
101 lines
2.4 KiB
Markdown
101 lines
2.4 KiB
Markdown
# log
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*log* enables query logging to standard output.
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## Syntax
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~~~ txt
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log
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~~~
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* With no arguments, a query log entry is written to *stdout* in the common log format for all requests
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~~~ txt
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log FILE
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~~~
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* **FILE** is the log file to create (or append to). The *only* valid name for **FILE** is *stdout*.
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~~~ txt
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log [NAME] FILE [FORMAT]
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~~~
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* `NAME` is the name to match in order to be logged
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* `FILE` is the log file (again only *stdout* is allowed here).
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* `FORMAT` is the log format to use (default is Common Log Format)
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You can further specify the class of responses that get logged:
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~~~ txt
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log [NAME] FILE [FORMAT] {
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class [success|denial|error|all]
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}
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~~~
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Here `success` `denial` and `error` denotes the class of responses that should be logged. The
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classes have the following meaning:
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* `success`: successful response
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* `denial`: either NXDOMAIN or NODATA (name exists, type does not)
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* `error`: SERVFAIL, NOTIMP, REFUSED, etc. Anything that indicates the remote server is not willing to
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resolve the request.
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* `all`: the default - nothing is specified.
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If no class is specified, it defaults to *all*.
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## Log File
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The "log file" can only be *stdout*. CoreDNS expects another service to pick up this output and deal
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with it, i.e. journald when using systemd or Docker's logging capabilities.
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## Log Format
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You can specify a custom log format with any placeholder values. Log supports both request and
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response placeholders.
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The following place holders are supported:
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* `{type}`: qtype of the request.
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* `{name}`: qname of the request.
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* `{class}`: qclass of the request.
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* `{proto}`: protocol used (tcp or udp).
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* `{when}`: time of the query.
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* `{remote}`: client's IP address.
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* `{size}`: request size in bytes.
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* `{port}`: client's port.
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* `{duration}`: response duration.
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* `{>bufsize}`: the EDNS0 buffer size advertised.
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* `{>do}`: is the EDNS0 DO (DNSSEC OK) bit set.
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* `{>id}`: query ID
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* `{>opcode}`: query OPCODE.
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* `{rcode}`: response RCODE.
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* `{rsize}`: response size.
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The default Common Log Format is:
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~~~ txt
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`{remote} - [{when}] "{type} {class} {name} {proto} {size} {>do} {>bufsize}" {rcode} {rsize} {duration}`
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~~~
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## Examples
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Log all requests to stdout
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~~~
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log stdout
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~~~
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Custom log format, for all zones (`.`)
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~~~
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log . stdout "{proto} Request: {name} {type} {>id}"
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~~~
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Only log denials for example.org (and below to a file)
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~~~
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log example.org stdout {
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class denial
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}
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~~~
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