Launcher runs as a daemon under your init system, and logs to
stderr. Most modern linux systems are using
systemd, and logs may be examined with the
journalctl command. You can retrieve logs with
journalctl -r "SYSLOG_IDENTIFIER=launcher"
Launcher can be configured to log with various information levels. When working with Kolide, you may be asked to enable debug mode. You can do this by running the following command in a terminal window. It needs root permission, and will prompt you for your password.
sudo pkill -SIGUSR2 -f /usr/local/kolide-k2/bin/launcher
debug mode can be turned off by running that same command.