When Anchore was formed there was an obvious gap in terms of open source container security and our goal was to fill that gap with the best in breed container scanning solution that added not just reporting but policy based compliance. At the same time we were working on Anchore CoreOS released the Clair project which provided an open source vulnerability scanner. We are big fans of the work CoreOS has done in the container community so we looked into that project but saw a number of gaps:
One of the most popular features of the Anchore Cloud service is the ability to deep dive into any container image to inspect its contents to see what files, packages and software libraries make up an image. Before I import any public image into my development environment I check out the list of security vulnerabilities in the image, if any, the policy status (does it fail basic compliance checks) and then I dig into the contents tab to see what operating system packages and libraries are in the image. I am still surprised at just how large many images are.