Mmastodon TechnologySoftware first seen 2 d ago, last 2 d ago, peak #4
Kubernetes clusters can fail even when all deployments report ready
Original: Every deployment in this three-zone cluster reports ready: $ kubectl get deployments NAME ... # kubernetes # devops # sr
A Kubernetes cluster spread across three zones can show every deployment as fully ready—3/3—yet still go dark if a single zone fails. The warning highlights that kubectl readiness status reflects pod health, not zone-level resilience, and engineers are reminded to check replication across availability zones rather than trusting aggregate deployment status.
Why now: It challenges a common assumption among Kubernetes operators that 'all ready' means resilient, sparking discussion about multi-zone failure modes.
Evidence
- Every deployment in this three-zone cluster reports ready: $ kubectl get deployments NAME ... # kubernetes # devops # sre # opensource # software # coding # development # engineering # inclusive # community Your cluster says 3/3. It will still go dark with one zone. · hackaday@www.urbanmind.net · 2
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