Arvados

The way Arvados is supposed to be configured is services start by reading config.default.yml and then merge in the cluster config.yml. config.yml is expected to only have settings that the administrator has actually changed.

Our Ansible playbooks don't really respect this. If they need a value from Arvados configuration, they usually assume they can find it in the administrator's config.yml. There are some hard-coded defaults in the code but this approach isn't scalable and risks drifting away from config.default.yml.

Plan and implement a way for all of our Ansible playbooks to initialize the arvados_config fact with values from config.default.yml.