etcd
Distributed key-value store built on Raft, used as the cluster state store for Kubernetes. Covers install, single-node and three-node cluster setup, TLS, RBAC, backup/restore, tuning, and monitoring.
Etcd
PostgreSQL
Setup and operation of a Patroni-managed PostgreSQL 17 cluster with etcd consensus and PgBouncer connection pooling, covering SSL, performance tuning, WAL archiving, PITR, and logical replication.