Dedicated server App is only for windows so far and the EULA officially now states what was mention here before:
"Running the Application is only allowed with a Steam login that owns ARK Survival Ascended, with one Application instance allowed per login."
https://store.steampowered.com//eula/2430930_eula_0
Sorry, this is a poop move.. Linux server and no limit, please. Otherwise my ASA time is already over.