tc Server ALL must generate log records for system startup and shutdown.
Logging must be started as soon as possible when a service starts and when a service is stopped. Many forms of suspicious actions can be detected by analyzing logs for unexpected service starts and stops. Also, by starting to log immediately after a service starts, it becomes more difficult for suspicious activity to go unlogged.
During start, tc Server reports system messages onto STDOUT and STDERR. These messages will be logged if the initialization script is configured correctly. For historical reasons, the standard log file for this is called catalina.out.