Feature Branch Preview Environments with Kubernetes.

A shared test API makes parallel changes interfere with one another. The proposed preview contains the API and its disposable dependencies, with either a controlled AEM test endpoint or a contract-compatible stub supplying content.

Separate hostnames do not separate credentials, outbound traffic or data. A namespace gives resources a scope, but the design also needs restrictive RBAC, supported network policies, resource quotas and a clear rule for which external systems a preview may contact.

Derive a bounded, DNS-safe identifier from the pull request and repository, not an arbitrary branch name alone. Use that identity for the namespace, routing host, configuration and fixture dataset; a controller-backed ingress or gateway exposes the review endpoint behind appropriate access controls.

Build an immutable image from the commit, then reconcile the namespace and manifests with narrowly scoped deployment credentials. Treat untrusted fork builds separately: they must not inherit cluster credentials or access private AEM endpoints.

• Inject preview-only secrets; never bake them into the image.
• Use deterministic fixture data and contract tests alongside live integration tests.
• Attach owner, pull-request and expiry metadata so abandoned resources can be identified.

Wait for scheduling, startup and readiness before running smoke and integration checks. Associate test evidence and the URL with the exact commit so reviewers do not accidentally approve a stale deployment.

Namespace deletion does not prove that external DNS records, provisioned databases or retained volumes are gone. Track these resources explicitly, retry idempotent cleanup and alert on namespaces stuck terminating rather than blindly removing finalizers.

A shared AEM test instance preserves realistic integration behavior but can still couple previews through content and rate limits. Stubs offer faster, reproducible checks but need contract verification; neither mode establishes full production equivalence.

Continue with the complementary design in Dockerized AEM Development: Reproducible Setup and Configuration.

The intended result is a reproducible feedback loop with clear environment ownership. It remains a design objective until the lifecycle is exercised under failures.

• Attempt cross-namespace access and forbidden outbound connections; inspect actual policy enforcement.
• Cancel a pipeline during deployment, close its branch and verify both in-cluster and external resources are removed.
• Update a branch during review and verify routing, fixtures and results refer to the new image digest.
• Exercise quota exhaustion, missing secrets and unavailable AEM dependencies without exposing credentials.

Provisioning is the easy half of ephemeral infrastructure. The useful engineering unit is the full contract: trusted inputs, isolated dependencies, reproducible tests, discoverable ownership and verifiable destruction.

These sources document product behavior. The design and validation approach above are engineering proposals, not claims made by the vendors.

• Kubernetes: multi-tenancy and isolation
• Kubernetes: Ingress and controller requirements
• Kubernetes: Secrets