Can't run OpenFOAM. Refuses root user.
 

I did a fresh install of OpenFoam on a linux system. I'm trying to run one of the tutorials and mpirun is refusing execute saying that I'm the root user. I'm not logged in as root, so I don't know how I suddenly got promoted to a root user. (Bad security hole there!) I'm guessing this is an issue with docker. Is there a work around for this?