Project Harbor is another VMware initiative in the Cloud Native Apps space. In a nutshell, it allows you to store and distributes Docker images locally from within your own infrastructure. While Project Harbor provides security, identity and management of images, it also offers better performance by having the registry closer to the build and run environment for image transfers. Harbor also supports multiple deployments so that you can have images replicated between them for high availability. You can get more information (including the necessary components) about Project Harbor on github.
In this post, we will deploy Project Harbor in Photon OS, and then create some docker volumes on Virtual SAN using the docker volume driver for vSphere. This will provide an additional layer of availability for your registry and images, because if one of the physical hosts in your infrastructure hosting Project Harbor fails, there is still a full copy of the data available. Special thanks to Haining Henry Zhang of our Cloud Apps team for helping me understand this process.