Why Kubernetes Node OS Still Shapes Pe...

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" summary

Kernel updates that break every pod happen in real deployments, CNIs like Calico fail on specific cloud drivers about once a year, and silent changes such as MTU shifts cause widespread outage and block lifecycle repair. Cluster API originally chooses an immutable Node OS with Cluster API rollouts then reintroduces mutability to allow registry, certificate, and small tuning changes without full node replacement. Platform contracts, drift prevention, and integration with vendors such as Canonical Stan 718 showcase determine upgrade confidence.

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