From the DockerCon Hackathon - Introducing SherDock: Docker Image Management Simplified

This year we sponsored the DockerConHackathon, and had an amazing 24 hours working with people hacking on Docker, Rancher, RancherOS and more. Two of our team, Darren Shepherd and Alena Prokharchyk were judges, so we didn’t think it would be fair to enter the contest. That said, we wanted to be involved in the hacking anyway so we built a little tool called SherDock, a simple image management tool for garbage collection, identifying orphaned volumes and more. The idea was to help de-clutter your Docker environment, and at the same time ensure images you do want are always available, with the latest versions pulled if so desired. Specifically, SherDock runs on a single Docker host and does the following: - Discovers images, their sizes, and whether they are in use. - Shows volumes and reads on disk meta data to determine orphaned volumes. - Graphs image layers and relationships - Garbage collect unused images on a configurable interval - Defines an exception list from garbage collection - Automatically pulls and caches images on a timed interval to ensure latest versions of a Rancher is available Everything is managed through the SherDock web interface, which can be exposed when you deploy the rancherio/sherdock container. You can see all the source code, and find installation instructions for SherDock on github. Special thanks to the big help from Josh Curl and Ankush Agarwal who joined our team and were incredibly helpful in building the garbage collection and backend systems! Volume Management in SherDock: SherDock Configuration Management [](https://cdn.rancher.com/wp-content/uploads/2015/06/21185811/sherdock-screenshot-volumes1.png)