While a buildbot daemon runs, it emits text to a logfile, named
twistd.log. A command like
tail -f twistd.log is useful
to watch the command output as it runs.
The buildmaster will announce any errors with its configuration file in the logfile, so it is a good idea to look at the log at startup time to check for any problems. Most buildmaster activities will cause lines to be added to the log.