Added support to configure standby_clusters in patroni

changelogs/unreleased/brodock-patroni-standbycluster.yml

+---
+title: Allow bootstrapping patroni Standby Cluster
+merge_request: 4558
+author:
+type: added

files/gitlab-cookbooks/patroni/attributes/default.rb

@@ -17,6 +17,12 @@ default['patroni']['use_pg_rewind'] = false
 default['patroni']['use_slots'] = true
 default['patroni']['replication_slots'] = {}
+# Standby cluster replication settings
+default['patroni']['standby_cluster']['enable'] = false
+default['patroni']['standby_cluster']['host'] = nil
+default['patroni']['standby_cluster']['port'] = 5432
+default['patroni']['standby_cluster']['primary_slot_name'] = nil
+
 # Global/Universal settings
 default['patroni']['name'] = node.name
 default['patroni']['scope'] = 'postgresql-ha'

files/gitlab-cookbooks/patroni/libraries/patroni_helper.rb

@@ -3,6 +3,7 @@ class PatroniHelper < BaseHelper
   DCS_ATTRIBUTES ||= %w(loop_wait ttl retry_timeout maximum_lag_on_failover max_timelines_history master_start_timeout).freeze
   DCS_POSTGRESQL_ATTRIBUTES ||= %w(use_pg_rewind use_slots).freeze
+  DCS_STANDBY_CLUSTER_ATTRIBUTES ||= %w(host port primary_slot_name).freeze
   attr_reader :node
@@ -63,6 +64,14 @@ class PatroniHelper < BaseHelper
       dcs['slots'][slot_name] = parse_replication_slots_options(options)
     end
+    if node['patroni']['standby_cluster']['enable']
+      dcs['standby_cluster'] = {}
+
+      DCS_STANDBY_CLUSTER_ATTRIBUTES.each do |key|
+        dcs['standby_cluster'][key] = node['patroni']['standby_cluster'][key]
+      end
+    end
+
     dcs
   end