kubernetes
8 minKubernetes Foundations: Objects, Controllers, and Reconciliation
Learn how desired state, API objects, and controller loops turn declarative manifests into running workloads.
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16 matching resultsArticles and interview answers
kubernetes
5 minKubernetes Foundations: Pods, Workloads, and Declarative State
Understand what the API stores, why controllers replace Pods, and how labels connect workloads without treating a cluster as a remote shell.
Q&A
Q&AWhy can a Kubernetes object remain after deletion was requested?
A controller has not removed its finalizer after completing external cleanup.
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The API server records deletion and retains the object while finalizers remain. The owning controller must retry idempotent cleanup and remove only its own finalizer after confirmed completion.
kubernetes
8 minKubernetes finalizers: deletion is a protocol, not a cleanup callback
Follow deletion timestamps and controller-owned finalizer removal without hiding leaked resources.
kubernetes
18 minKubernetes Advanced Operations: Packet Paths, Rollouts, DNS, and Operators
Trace service traffic, prevent rollout 502s, debug CPU throttling and CoreDNS, and design conflict-safe controller reconciliation.
devops
5 minDevOps Foundations: Safe Changes, Health Signals, and Rollback Boundaries
Design a release as a controlled change to code, configuration, and data, with explicit health checks and a recovery plan that matches what can actually be reversed.
unix
8 minpipefail, Signals, and Unix Process Management
Unix is full of tiny control primitives. Learn how `set -o pipefail`, process signals, and clean lifecycle management keep shell pipelines reliable and debuggable.
Q&A
Q&AWhy can a Kubernetes drain be blocked by a healthy-looking deployment?
Eviction permission depends on the budget and observed ready capacity.
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A PDB can reject supported voluntary eviction when too few healthy selected pods would remain. It does not prevent node failures, guarantee replacement capacity, or govern every controller deletion.