Mention foreign keys constraints are incompatible with group replication.

diff --git a/docs/backends/generic-mysql.rst b/docs/backends/generic-mysql.rst
index 811975dfab5eded4028c74c42a8e7dc738122ce9..1ced43ef65fcfa92b02706cc89719530446eefb0 100644 (file)
--- a/docs/backends/generic-mysql.rst
+++ b/docs/backends/generic-mysql.rst
@@ -48,6 +48,11 @@ domains table. The following SQL does the job:
 .. literalinclude:: ../../modules/gmysqlbackend/enable-foreign-keys.mysql.sql
    :language: SQL
 
+.. warning::
+  Please note, however, that setting up these foreign key constraints prevents
+  the PowerDNS database from being usable with mysql group replication, if you
+  are using multiple servers.
+
 Using MySQL/MariaDB replication
 -------------------------------