SSL is required for a secure connection between the client and the server so confidential data cannot be intercepted by any middle-man
Patroni has command line utility patronictl which can be used to interact with the Patroni postgres cluster. Let's see patroni commands every DBA should know.
Passive Postgres replicas can be used for read-only requests instead of master node in HA cluster.
Configure and setup PostgreSQL HA cluster using Patroni, ETCD and HAProxy