Multi Tenancy

Having the ability to run multiple houses is key and a differentiator for eGeoffrey. This allows to easily host multiple users within the same environment or even deliver eGeoffrey-as-a-service to multiple house. To ensure maximum isolation, confidentiality of the data and flexibility to run different versions of the software for each house, the following approach has been adopted.

Gateway

The gateway component is supposed to be common among multiple houses.

  • The topic structure allows to easily isolate logically individual houses (provided of course they have a different house_id)
  • Since the same house_id and passcode (username and password for the gateway) is used for all the modules belonging to the same house, the service provider has add a single user to the gateway to provide a new house
  • The gateway's ACLs can prevent a user to see what's happening inside a different house. Additionally ACLs can be set based on username so the service provider needs to maintain only a single ACL with the username wildcard

Modules

Every house will run its own dedicated modules (including the Web UI) connecting to a shared gateway. This choice has been taken to achieve the following:

  • Code simplicity since every module should keep otherwise a map between the house and its entire runtime environment and challenges in distinguishing between shared modules and house-dedicated modules in the communication
  • Users can restart their own components without affecting all the houses which could have suffered a downtime otherwise
  • Possibility for managing entitlements for every house (e.g. a given house can have only a portion of the services of another house)
  • Ability to measure how much resources a house is using - useful in a consumption-based scenario
  • Simplify debug and troubleshoot (how to understand which house is causing an excessive load on a shared service)
  • Scalability (e.g. how to scale a shared service with all the houses having the same resources available)
  • Multi-version support
  • Isolation and increased security

Database

Since Redis does not provide robust authentication/authorization mechanisms for this scenario, either use a different redis database for each house or use a single, shared MongoDB database. In this scenario each database map to a different house. It is up to the admin to provision users to MongoDB, ideally assigning a dbAdmin role only for the assigned database (e.g. the house_id) to the user.