DNS failure while running Centos7 in Docker on Centos6

We’ve been trying to run programs on the latest CentOS 7 Docker image, running it on a CentOS 6.6 machine. The problem we’ve found is that the CentOS 7 inside of Docker can’t make any DNS calls.

Has anyone else run into this problem? Is this just a matter of installing something extra into the CentOS 7 image?