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-rw-r--r--nova/conf/api.py7
1 files changed, 5 insertions, 2 deletions
diff --git a/nova/conf/api.py b/nova/conf/api.py
index 5c8a367e8e..58cbc4931e 100644
--- a/nova/conf/api.py
+++ b/nova/conf/api.py
@@ -225,8 +225,11 @@ service.
help="""
Domain name used to configure FQDN for instances.
-Configure a fully-qualified domain name for instance hostnames. If unset, only
-the hostname without a domain will be configured.
+Configure a fully-qualified domain name for instance hostnames. The value is
+suffixed to the instance hostname from the database to construct the hostname
+that appears in the metadata API. To disable this behavior (for example in
+order to correctly support microversion's 2.94 FQDN hostnames), set this to the
+empty string.
Possible values: