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Goal: Configure a Kubernetes client-go retry loop so that a POST create request, when retried after a network timeout or 503 response, does not create a second instance of the same resource. The API server treats POST as non‑idempotent; a successful create that the client does not observe may lead to duplication on retry unless the operation is made idempote
Gardener apiServer: Private‑Only Enforcement The Gardener apiServer configuration can restrict access to a shoot cluster’s Kubernetes API server, but the default behaviour leaves the endpoint exposed via a cloud provider load balancer. While the spec allows specifying network policies or firewall rules, the toggle to enforce a “private‑only” API server is no
client-go's watch interfaces take a context.Context , and cancelling it is the documented way to stop a watch. On the wire, though, a watch is one-way server push: once the stream is established there is no in-band cancellation frame, so the server has to infer that the client is gone. How quickly it infers that appears to depend on the transport. Over HTTP/
k3s forwards API requests to the underlying datastore without a de-duplication layer for POST operations. In HA mode with etcd, client libraries retry on transient errors and kubectl --retry repeats the HTTP request. The current configuration lacks an explicit idempotency guarantee for create operations. The goal is a consistent behavior for retries that avo
Goal Determine the most suitable authentication mechanism for the Talos API server when the port is fixed at 443 and no built‑in token rotation exists. Constraints The static token file is only present during bootstrap and is removed thereafter, so it cannot serve long‑term authentication. The API server offers no port override, limiting external exposure. K
When implementing custom controllers in Kubernetes (v1.28+), ensuring that retried write operations do not result in duplicate resources or overwritten data is critical. The API server utilizes optimistic concurrency control via the resourceVersion field to prevent conflicting updates during PUT requests. While resourceVersion manages updates, the behavior f
Server‑Side LIST pagination: when does a continue token expire? When exporting a large set of objects with the API server’s LIST chunking, clients supply limit and receive a continue token in metadata.continue . The next call repeats the query with that token. In practice, the token is tied to a snapshot resourceVersion , and if the snapshot becomes stale or
kubernetes
gardener
k3s
talos