Yes, there should be no output with '-d', it's daemon mode - it should silently detach and go to background.
Before running it as daemon, you can check that config files are good and agent is working properly by running it with '-D3' (3 - debug level, can be from 0 to 9)
Before running it as daemon, you can check that config files are good and agent is working properly by running it with '-D3' (3 - debug level, can be from 0 to 9)