Merge "Wait for MariaDB to be accessible via HAProxy"

ansible/roles/mariadb/tasks/recover_cluster.yml

@@ -213,3 +213,5 @@
   when:
     - bootstrap_host is defined
     - bootstrap_host != inventory_hostname
+
+- import_tasks: wait_for_loadbalancer.yml

ansible/roles/mariadb/tasks/register.yml

@@ -14,6 +14,8 @@
       priv: "*.*:USAGE"
   run_once: True
 
+- import_tasks: wait_for_loadbalancer.yml
+
 - name: Creating the Percona XtraBackup database
   become: true
   kolla_toolbox:

ansible/roles/mariadb/tasks/wait_for_loadbalancer.yml

@@ -0,0 +1,16 @@
+---
+# Explicitly wait for the database to be accessible via the load balancer.
+# Sometimes it can reject connections even when all database services are up,
+# due to the health check polling in HAProxy.
+- name: wait for MariaDB to be available via HAProxy
+  wait_for:
+    host: "{{ database_address }}"
+    port: "{{ database_port }}"
+    connect_timeout: 1
+    timeout: 60
+    search_regex: "MariaDB"
+  register: check_mariadb_port
+  until: check_mariadb_port is success
+  retries: 10
+  delay: 6
+  run_once: True