etcd
etcd is a distributed key-value store for configuration, service coordination, and other critical metadata. It keeps one consistent view of that data across a cluster, even when some members fail.
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Don't Panic
Don't Panic - etcd
etcd centers on etcd. etcd is a distributed key-value store for data that a system must agree on. It keeps configuration, coordination records, and other critical metadata in a flat key space.
Operate from the project's own resources and APIs. Learn how desired state becomes running state, which status conditions matter, and which dependencies (network, storage, identity, certificates) the control plane assumes.
Upgrades, backups, and credential rotation are part of the product, not optional aftercare. Version skew between clients and servers creates failures that look like application bugs. Pin versions and rehearse rollback.
Convenience features reduce boilerplate and widen blast radius. Enable them when you can observe and reverse the expanded surface. Defaults from quickstarts are starting points, not production policy.
Name owners for upgrades, credentials, and disaster recovery before traffic arrives. Unowned control-plane state becomes an outage with no clear pager. Prefer explicit version pins and tested rollback over floating tags that quietly change behavior between deploys.
Name owners for upgrades, credentials, and disaster recovery before traffic arrives. Unowned control-plane state becomes an outage with no clear pager. Prefer explicit version pins and tested rollback over floating tags that quietly change behavior between deploys.
Name owners for upgrades, credentials, and disaster recovery before traffic arrives. Unowned control-plane state becomes an outage with no clear pager. Prefer explicit version pins and tested rollback over floating tags that quietly change behavior between deploys.
Read the Intro for the mental model. Use the Cheatsheet when you need the resource map. Updates and Upstream track the etcd release line that changes these APIs.
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Sources
- https://etcd.io/
Supports
- etcd as a distributed, reliable key-value store for critical distributed-system data
- Raft-based replication and the role of etcdctl
- https://etcd.io/docs/v3.6/learning/why/
Supports
- Origin of the etcd name
- Metadata, configuration, service discovery, election, locking, and liveness use cases
- Preference for consistency over split-brain availability
- Comparison boundary with other key-value stores
- https://etcd.io/docs/v3.6/learning/data_model/
Supports
- Flat binary key space and lexical ranges
- Multiversion storage, revisions, key versions, and retained history
- Workload focus on infrequently updated data and reliable watches
- Compaction of older superseded revisions
- https://etcd.io/docs/v3.6/learning/api/
Supports
- gRPC service organization
- KV range, put, delete, and transaction operations
- Watch events and streams
- Lease grant and keep-alive behavior
- Auth, Cluster, and Maintenance service roles
- https://etcd.io/docs/v3.6/learning/api_guarantees/
Supports
- Durability and strict serializability of completed KV operations
- Revision ordering and transaction atomicity
- Watch ordering, reliability, delay, and compaction boundary
- Lease behavior and time-to-live semantics
- https://etcd.io/docs/v3.6/learning/design-client/
Supports
- Endpoint selection, retry, failover, and load-balancing concerns
- Preservation of consistency guarantees across client failures
- Unknown outcomes and at-most-once semantics for mutable operations
- https://etcd.io/docs/v3.6/learning/design-learner/
Supports
- Non-voting learner members
- Catch-up before promotion to a voting member
- Membership-change safety motivation
- https://etcd.io/docs/v3.6/learning/glossary/
Supports
- Official terminology for clients, clusters, members, leaders, followers, and revisions
- https://etcd.io/docs/v3.6/op-guide/failures/
Supports
- Follower and leader failure behavior
- Majority requirements and network partition behavior
- Client reconnection after member failure
- https://etcd.io/docs/v3.6/op-guide/maintenance/
Supports
- Periodic maintenance requirement
- Compaction, defragmentation, space quota, and storage alarms
- Snapshot backups and Raft log retention
- https://etcd.io/docs/v3.6/op-guide/recovery/
Supports
- Failure tolerance for N-member clusters
- Effect of permanent quorum loss
- Snapshot creation, verification, and restoration into a new cluster
- https://etcd.io/docs/v3.6/op-guide/monitoring/
Supports
- Health, debug, and metrics endpoints
- Prometheus-format monitoring and alerting
- Grafana dashboards for etcd metrics
- https://etcd.io/docs/v3.6/op-guide/security/
Supports
- Transport security for client and peer traffic
- Certificate-based authentication options
- https://etcd.io/docs/v3.6/op-guide/authentication/rbac/
Supports
- Users, roles, authentication, and key-range permissions
- Least-privilege access-control guidance
- https://kubernetes.io/docs/tasks/administer-cluster/configure-upgrade-etcd/
Supports
- Kubernetes storage of cluster data in etcd
- Odd-member quorum guidance
- Operational importance of backup, TLS, and low-latency storage
- https://github.com/sindresorhus/awesome
Supports
- Discovery entry point for the curated Awesome Kubernetes list
- https://github.com/ramitsurana/awesome-kubernetes
Supports
- Discovery of Prometheus and Grafana as Kubernetes monitoring ecosystem projects relevant to etcd operation
- https://prometheus.io/docs/introduction/overview/
Supports
- Prometheus collection and querying of time-series metrics
- Alerting use for monitored systems
- https://grafana.com/docs/grafana/latest/fundamentals/
Supports
- Grafana dashboards and data-source visualization
- Operational exploration of collected metrics