How to Migrate a Spring Boot Application from Cloud Foundry to Kubernetes (Without Rewriting It)

Migrating a Spring Boot application from Cloud Foundry to Kubernetes is presented as primarily a platform-contract change rather than a rewrite of Java business logic, replacing CF buildpacks, VCAP_SERVICES, routes, scaling, logging, and health checks with container images, Kubernetes Secrets and ConfigMaps, Ingress or Gateway API routing, deployments and autoscaling, and stdout plus Actuator probes. The recommended approach is to remove Cloud Foundry-specific integrations such as spring-cloud-connectors, VCAP_SERVICES parsing, cloud profiles, and reliance on local storage or sticky sessions, then use standard Spring Boot environment-based properties and externalize state through managed databases, Redis, object storage, or persistent volumes. Paketo Buildpacks can preserve a Dockerfile-free build workflow, while careful JVM memory tuning, startup probes, graceful shutdown configuration, resource quotas, secrets management, observability, and traffic cutover planning are emphasized as major operational responsibilities previously handled by Cloud Foundry. The guide advises phased migrations that keep both platforms active until validation is complete, noting that individual services may move quickly but larger estates require substantial work on shared infrastructure, data migration, routing, security, and deployment practices. It outlines several target models, including raw Kubernetes, Korifi for CF-style workflows, commercial platforms such as Tanzu or OpenShift, and internal developer platforms such as Qovery, which is promoted as a way to retain push-to-deploy workflows, preview environments, and self-service services on Kubernetes.

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