How to Automate PostgreSQL 12 Replication and Failover with repmgr

service: Can't open PID file runrepmgr after Replication slots: OK

Now a common cause for this kind of issue are replication slots which are not advanced: in that case, Postgres will hold on to all WAL segments

error_ replication slot is active for pid Active: active since Fri 2020–04–10 20:56:32 AEST; 3s pg_basebackup: created temporary replication slot “pg_basebackup_16834”

error slot replication slot: FAILED lock was still there containing the supposedly PID that ran before the