High Availability and Disaster Recovery Options for PostgreSQL

This document is a technical guide that outlines various high-availability cluster architectures and disaster recovery options for PostgreSQL, utilizing technologies such as Patroni, Kubernetes, and OpenShift. It describes multiple configurations, including simple Patroni clusters, standby clusters for single cluster failovers, and various automatic failover strategies involving multiple data centers. The guide details the core requirements for each option, such as the need for an odd number of etcd nodes and specific database server configurations. It also discusses the advantages and disadvantages of each architecture, including considerations for data center failover and the implications of using cloud infrastructure. The document aims to provide customers with a comprehensive understanding of how to implement resilient and redundant PostgreSQL systems to ensure continuous operation and data integrity in the event of failures.