docker-postgres-backup/docker-entrypoint-initdb-co.../1.1.0_01_master_create_rep_...

#! /usr/bin/env bash

if [ "${POSTGRES_MASTER_MODE}" != 1 ]
then
  echo "Database is not in master mode. Exiting."
  exit 0
fi

psql <<-EOF
  CREATE USER "${POSTGRES_REP_USER}" REPLICATION LOGIN ENCRYPTED PASSWORD '${POSTGRES_REP_PASSWORD}';
EOF