Configuring Crossbar.io Logging

Crossbar.io has configurable logging systems, to make its log output easier to consume or nicer to look at.

Formats

Crossbar.io has three log formats, specified by the --logformat switch.

• color: This is the default, and outputs colored logging messages. Example

• nocolor: This reduces the color output by Crossbar, and is suitable for redirecting to files. Example

• syslogd: This removes timestamps, and reduces the color. Example

Levels

Crossbar.io supports restricting the output to certain levels, specified by the --loglevel switch. These levels are:

• none: No output.

• critical: Critical or above.

• error: Error or above.

• warn: Warning or above.

• info: The default – Info or above.

• debug: Debug or above, and turn on the source location of the log events (what class/function generated them). Example

• trace: Trace or above. Some internal Crossbar.io components support trace logging, this is not yet extended to user components.

Logging to a file

By passing --logtofile to Crossbar.io, you can log to the location specified by --logdir. You may combine the --loglevel switches with --logtofile, but not --logformat (it is always in nocolor).

Adding logging to your components

If you want to integrate with Crossbar.io’s logging system, see Logging in Crossbar.io .