Etcd
etcd is an open-source distributed key-value store providing strongly consistent storage for configuration, service discovery, and cluster or application state.
Acing the Certified Kubernetes Administrator Exam, Second Edition
etcd is a consistent distributed key-value store used by Kubernetes to persist cluster configuration and resource state.
- How it is used
- Stores Kubernetes cluster configuration and resource state for the control plane, distinct from application data.
- How deep it goes
- Explains the pod, API server TLS settings, and a connectivity repair; does not demonstrate direct datastore operations.
- Examples
- Uses an API server manifest and a wrong-endpoint failure diagnosed through crictl logs and verified with kubectl.
- What you can do after
- Diagnose/debug an API server’s etcd connection by checking its endpoint, certificates, container logs, and recovered API access.
Read how Acing the Certified Kubernetes Administrator Exam, Second Edition explains etcd →
Google Anthos in Action
etcd is a distributed, strongly consistent key-value store used to persist Kubernetes cluster state and resource data.
- How it is used
- Stores Kubernetes resources and cluster state for control-plane operation.
- How deep it goes
- Explains storage responsibility, replica-count rationale, split-brain failure, backups, recovery, and clear-text security exposure.
- Examples
- Uses odd-numbered etcd replicas, external database backups, corrupted-cluster recovery, and stored Kubernetes secrets as operational examples.
- What you can do after
- Operate/configure etcd for quorum-based availability, external backups, cluster restoration, and protection of sensitive resource data.
Related concepts
- kubernetes api serverused by · The Kubernetes API server is the control-plane component that exposes, validates, and processes the Kubernetes API for managing cluster resources and state.
- control plane nodepart of · A control plane node is a Kubernetes cluster machine that hosts components managing cluster state, exposing the cluster API, scheduling workloads, and coordinating operations.
- gRPCuses · gRPC is an open-source remote procedure call framework for defining services and invoking them across process or network boundaries, commonly using Protocol Buffers and HTTP/2.
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