Skupper

What Skupper is

Skupper is a free, open-source application interconnect for creating private networks across sites and platforms. It forwards local service traffic between sites over existing IP networks, connecting services across network boundaries without VPNs or special firewall rules. Skupper forms an isolated application network with logical service addresses, and its product page says application services are never exposed on the public internet. Router connections use mutual TLS with a private, dedicated certificate authority, and each router has its own certificate. Skupper can distribute requests among service instances according to capacity and configured link costs, balance new TCP connections across workloads at different sites, and reroute traffic when a workload becomes unavailable. Multi-key listeners support weighted distribution and priority-based failover across routing keys. The project lists remote resource access, platform migration, application resiliency, and highly distributed applications as use cases. Kubernetes controllers can be installed from YAML, Helm charts, or an Operator; local-system sites require the CLI. Sites and service exposure can also be managed with CLI commands or declarative YAML using Site, Listener, and Connector resources. Skupper code and documentation use the Apache License version 2.0. Stateful applications that need a controlled order for traffic redirection require failover orchestration implemented separately.