Runs the server silently. If this parameter is set, the server will automatically run in background and disassociate from the controlling terminal. This parameter can only be set at server start.
When this parameter is set, the server's standard output and standard error are redirected to the file postmaster.log within the data directory. There is no provision for rotating this file, so it will grow indefinitely unless server log output is redirected elsewhere by other settings. It is recommended that log_destination be set to
syslog or that logging_collector be enabled when using this option. Even with those measures, errors reported early during startup may appear in postmaster.log rather than the normal log destination.