Link: Skupper

Skupper - Multicloud communication

Skupper is a layer-7 service multi-cluster interconnection service. Skupper enables secure communication across Kubernetes clusters by defining an ad-hoc virtual networking substrate. Unlike Submariner and Cilium, Skupper does not introduce a cluster-wide interconnection but just for a specific set of namespaces. Skupper implements multi-cluster services in namespaces exposed in the Skupper network. When a service is exposed, Skupper creates particular endpoints, making them available on the entire cluster.

From their website:

In a Skupper network, each namespace contains a Skupper instance. When these Skupper instances connect, they continually share information about the services that each instance exposes. This means that each Skupper instance is always aware of every service that has been exposed to the Skupper network, regardless of the namespace in which each service resides.

Once a Skupper network is formed across Kubernetes namespaces, any of the services in those namespaces can be exposed (through annotation) to the Skupper network. When a service is exposed, Skupper creates proxy endpoints to make that service available on each namespace in the Skupper network.