Default Interactive TTY prints daemon output

I work for a company that deploys clustered products using coreos and docker, and as part of our deployment, we automatically start up a few docker containers to expose, among others, a web interface for the client to interact with. The issue I am facing at the moment is that the terminal (be it bare metal, vmware, virtualbox) where coreos is deployed (non-ssh) is very verbose. It dumps all sorts of systemd information, as well as docker daemon output directly to the client-facing terminal. I rebuilt the coreos ISO to include some auto-deployment stuff, and would prefer if there was a way I could turn off this verbosity at ISO level, or even soon after boot (by adding a script to the ISO). I need to find out why this default terminal is used to dump daemon output?