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Server Drain

Server drain and live migration are not the same thing in Kindling.

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What Drain Means Today

When a server is marked draining:
  • new placements avoid that host
  • replacement replicas are started on active hosts
  • Kindling waits for healthy replacements
  • old instances on the draining host are then retired
The goal is evacuation with healthy traffic continuity where the deployment topology allows it.

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What Drain Does Not Mean

It does not mean in-memory live migration of a running workload process between hosts. That remains separate future work.

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Acceptance Shape

At a practical level, draining is successful when:
  • new instances are scheduled only on active hosts
  • traffic continues to target healthy backends
  • the drained host reaches zero non-deleted deployment instances
  • the host can later be re-activated