Allow root to log as postgres

roles/postgresql_server/handlers/main.yml

@@ -1,6 +1,6 @@
 ---
-- name: restart postgresql
+- name: Reload postgresql
   service:
     name: postgresql
-    state: restarted
-    enabled: true
+    state: reloaded
+...

roles/postgresql_server/tasks/main.yml

@@ -35,9 +35,16 @@
     group: postgres
   loop:
     - pg_hba.conf
+    - pg_ident.conf
     - postgresql.conf
   notify:
-    - restart postgresql
+    - Reload postgresql
+
+- name: Enable and start PostgreSQL
+  systemd:
+    name: postgresql.service
+    state: started
+    enabled: true
 
 - name: Create databases
   become: true

roles/postgresql_server/templates/postgresql/pg_hba.conf.j2

@@ -9,8 +9,7 @@
 # maintenance (custom daily cronjobs, replication, and similar tasks).
 #
 # Database administrative login by Unix domain socket
-local   all             postgres                                peer
-
+local   all             postgres                                peer map=map_root
 
 # "local" is for Unix domain socket connections only
 local   all             all                                     peer

roles/postgresql_server/templates/postgresql/pg_ident.conf.j2

@@ -0,0 +1,4 @@
+{{ ansible_managed | comment }}
+
+# MAPNAME       SYSTEM-USERNAME         PG-USERNAME
+map_root        root                    postgress