# log_trace

Sets the trace preference on the file defined by the `logfile` parameter. If `logfile` is not set, the values have no effect.

    log_trace = traceOptions

The value of this parameter is a comma-separated list of trace options. For a list of trace options and their meanings, see Server Tracing Options,.

You may specify trace options in three forms:

- plain A trace option without a prefix character replaces any existing trace options.
- + A trace option preceded by + adds the option to the current set of trace options.
- - A trace option preceded by - removes the option from the current set of trace options.

The following example sets the trace log to only show messages about access control violations.

    log_trace=ACL

The next example sets the trace log to show all default trace messages, in addition to SSL messages, but ADMIN messages are not shown.

    log_trace=DEFAULT,-ADMIN,+SSL

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