Etcd Concepts

Internal

• etcd
• Kubernetes Concepts
• OpenShift Concepts

Overview

etcd is a distributed, highly available key/value datastore for state within a cluster. etcd is used by Kubernetes cluster store to maintain configuration and other state. etcd is designed for large scale distributed systems, that will never tolerate split brain operation (network partitions) and are willing to sacrifice availability to achieve this. etcd prefers consistence over availability. Also see the CAP Theorem. etcd can be used as a consistent key-value store for configuration management, service discovery and coordinating distributed work.

etcd resolves write consistency issues suing the RAFT consensus algorithm.