TLDR Tech / DevOps
Multi-Cluster databases on Kubernetes: Architecture and deployment
A new guide from CNCF demonstrates how to build a fault-resistant MongoDB database on Kubernetes using a 2+2+1 deployment pattern that can survive complete regional failures by distributing five voting members across three clusters (two nodes in the main cluster, two in a replica cluster, and one arbiter in a third location). The architecture uses the Percona Operator for MongoDB with Kubernetes' Multi-Cluster Services API to enable automatic failover within 12 seconds, requiring only a simple majority of three out of five votes to elect a new primary node when disaster strikes.
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