Not everyone needs a self-hosted OAuth2 solution, but if you do, have a look at Hydra — a fully compliant open source OAuth2 server and OpenID connect provider. Hydra has in-memory storage support for development and a relational database (PostgreSQL) for production use cases. Hydra as such is stateless and easy to scale horizontally in platforms such as Kubernetes. Depending on your performance requirement, you may have to tune the number of database instances while scaling Hydra instances. And because Hydra doesn't provide any identity management solutions out of the box, you can integrate whatever flavor of identity management you have with Hydra through a clean API. This clear separation of identity from the rest of the OAuth2 framework makes it easier to integrate Hydra with an existing authentication ecosystem.
Not everyone needs a self-hosted OAuth2 solution, but if you do, we found Hydra — a fully compliant open-source OAuth2 server and OpenID connect provider — quite useful. We really like that Hydra doesn't provide any identity management solutions out of the box; so no matter what flavor of identity management you have, it's possible to integrate it with Hydra through a clean API. This clear separation of identity from the rest of the OAuth2 framework makes it easier to integrate Hydra with an existing authentication ecosystem.
