Enabling OpenID Connect authentication for the Kubernetes API server
will allow clients, particularly `kubectl` to log in without needing
TLS certificates and private keys.
Authelia can act as an Open ID Connect identity provider. This allows
it to provide authentication/authorization for other applications
besides those inside the Kubernetes cluster using it for Ingress
authentication.
To start with, we'll configure an OIDC client for Jenkins.
Authelia is a general authentication provider that works (primarily)
by integrating with *nginx* using its subrequest mechanism. It works
great with Kubernetes/*ingress-nginx* to provide authentication for
services running in the cluster, especially those that do not provide
their own authentication system.
Authelia needs a database to store session data. It supports various
engines, but since we're only running a very small instance with no real
need for HA, SQLite on a Longhorn persistent volume is sufficient.
Configuration is done mostly through a YAML document, although some
secret values are stored in separate files, which are pointed to by
environment variables.
Dustin