Service Logging Considerations
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An Ice service running as a Windows service logs to the Windows Application event log when no other logger is configured. The source name for the event log is the service's name unless a different value is specified using the property Ice.EventLog.Source.
On Linux and macOS, an Ice service logs to standard error when no other logger is configured. A service started with --daemon redirects standard error to /dev/null, which discards these log messages, unless --noclose, Ice.StdErr or Ice.StdOut is set. To keep the log messages of a daemon, set Ice.StdErr to send standard error to a file, Ice.UseSyslog to log to the syslog facility, or Ice.LogFile to write log messages to a file.
The systemd units included in the Linux packages start glacier2router, icegridnode and icegridregistry in the foreground, and the sample configuration files installed with them set Ice.UseSystemdJournal, so these services log to the systemd journal.
An Ice service that fails before it initializes its communicator logs the error to standard error, or to the Application event log when it runs as a Windows service, even when it is configured to use a different logger.