Add patroni_standby_cluster

Doc: https://patroni.readthedocs.io/en/latest/replica_bootstrap.html#standby-cluster

Author: vitabaks

roles/patroni/templates/patroni.yml.j2

@@ -59,10 +59,20 @@ bootstrap:
     synchronous_mode: {{ synchronous_mode |string |d(false, true) |lower }}
     synchronous_mode_strict: {{ synchronous_mode_strict |string |d(false, true) |lower }}
     synchronous_node_count: {{ synchronous_node_count |d(1, true) |int }}
-    # standby_cluster:
-      # host: 127.0.0.1
-      # port: 1111
-      # primary_slot_name: patroni
+  {% if patroni_standby_cluster.host is defined and patroni_standby_cluster.host | length > 0 %}
+    standby_cluster:
+      host: {{ patroni_standby_cluster.host }}
+      port: {{ patroni_standby_cluster.port }}
+    {% if patroni_standby_cluster.primary_slot_name is defined and patroni_standby_cluster.primary_slot_name | length > 0 %}
+      primary_slot_name: {{ patroni_standby_cluster.primary_slot_name }}
+    {% endif %}
+    {% if patroni_standby_cluster.restore_command is defined and patroni_standby_cluster.restore_command | length > 0 %}
+      restore_command: {{ patroni_standby_cluster.restore_command }}
+    {% endif %}
+    {% if patroni_standby_cluster.recovery_min_apply_delay is defined and patroni_standby_cluster.recovery_min_apply_delay | length > 0 %}
+      recovery_min_apply_delay: {{ patroni_standby_cluster.recovery_min_apply_delay }}
+    {% endif %}
+  {% endif %}
     postgresql:
       use_pg_rewind: {{ patroni_postgresql_use_pg_rewind |string |d(false, true) |lower }}
       use_slots: true

vars/main.yml

@@ -218,6 +218,14 @@ patroni_retry_timeout: 10
 patroni_maximum_lag_on_failover: 1048576
 patroni_master_start_timeout: 300
 
+# https://patroni.readthedocs.io/en/latest/replica_bootstrap.html#standby-cluster
+patroni_standby_cluster:
+  host: ""  # an address of remote master
+  port: "5432"  # a port of remote master
+#  primary_slot_name: ""  # which slot on the remote master to use for replication (optional)
+#  restore_command: ""  # command to restore WAL records from the remote master to standby leader (optional)
+#  recovery_min_apply_delay: ""  # how long to wait before actually apply WAL records on a standby leader (optional)
+
 patroni_log_destination: stderr  # or 'logfile'
 # if patroni_log_destination: logfile
 patroni_log_dir: /var/log/patroni