mgr: use ipv4 default when ipv6 was disabled

Fixes: https://tracker.ceph.com/issues/40023
Signed-off-by: kungf <yang.wang@easystack.cn>

ceph.spec.in

@@ -434,6 +434,7 @@ Requires:       ceph-base = %{_epoch_prefix}%{version}-%{release}
 Requires:       python%{_python_buildid}-bcrypt
 Requires:       python%{_python_buildid}-pecan
 Requires:       python%{_python_buildid}-six
+Requires:       python%{_python_buildid}-netifaces
 %if 0%{?fedora} || 0%{?rhel}
 Requires:       python%{_python_buildid}-cherrypy
 Requires:       python%{_python_buildid}-werkzeug
@@ -468,6 +469,7 @@ BuildArch:      noarch
 Group:          System/Filesystems
 %endif
 Requires:       ceph-mgr = %{_epoch_prefix}%{version}-%{release}
+Requires:       python%{_python_buildid}-netifaces
 %if 0%{?fedora} || 0%{?rhel}
 Requires:       python%{_python_buildid}-cherrypy
 Requires:       python%{_python_buildid}-ipaddress

src/pybind/mgr/dashboard/module.py

@@ -14,7 +14,7 @@
 import time
 from uuid import uuid4
 from OpenSSL import crypto, SSL
-from mgr_module import MgrModule, MgrStandbyModule, Option
+from mgr_module import MgrModule, MgrStandbyModule, Option, DEFAULT_ADDR
 
 try:
     import cherrypy
@@ -125,7 +125,8 @@ def _configure(self):
 
         :returns our URI
         """
-        server_addr = self.get_localized_module_option('server_addr', '::')
+        server_addr = self.get_localized_module_option('server_addr',
+                DEFAULT_ADDR)
         ssl = self.get_localized_module_option('ssl', True)
         if not ssl:
             server_port = self.get_localized_module_option('server_port', 8080)
@@ -295,7 +296,7 @@ class Module(MgrModule, CherryPyConfig):
     PLUGIN_MANAGER.hook.register_commands()
 
     MODULE_OPTIONS = [
-        Option(name='server_addr', type='str', default='::'),
+        Option(name='server_addr', type='str', default=DEFAULT_ADDR),
         Option(name='server_port', type='int', default=8080),
         Option(name='ssl_server_port', type='int', default=8443),
         Option(name='jwt_token_ttl', type='int', default=28800),

src/pybind/mgr/mgr_module.py

@@ -2,6 +2,7 @@
 
 import logging
 import json
+import netifaces
 import six
 import threading
 from collections import defaultdict, namedtuple
@@ -40,6 +41,23 @@
     "creating",
     "unknown"]
 
+def is_ipv6_enabled():
+    """
+    Check whether IPv6 is enabled.
+    :return: Return True if IPv6 is enabled, otherwise False.
+    :rtype: bool
+    """
+    interfaces = netifaces.interfaces()
+    for i in interfaces:
+        if netifaces.ifaddresses(i).has_key(netifaces.AF_INET6):
+            return True;
+    return False
+
+if is_ipv6_enabled():
+    DEFAULT_ADDR = '::'
+else:
+    DEFAULT_ADDR = '0.0.0.0'
+
 
 class CPlusPlusHandler(logging.Handler):
     def __init__(self, module_inst):

src/pybind/mgr/prometheus/module.py

@@ -8,14 +8,14 @@
 import socket
 import threading
 import time
-from mgr_module import MgrModule, MgrStandbyModule, CommandResult, PG_STATES
+from mgr_module import MgrModule, MgrStandbyModule, CommandResult, PG_STATES, \
+    DEFAULT_ADDR
 from rbd import RBD
 
 # Defaults for the Prometheus HTTP server.  Can also set in config-key
 # see https://github.com/prometheus/prometheus/wiki/Default-port-allocations
 # for Prometheus exporter port registry
 
-DEFAULT_ADDR = '::'
 DEFAULT_PORT = 9283
 
 # When the CherryPy server in 3.2.2 (and later) starts it attempts to verify
@@ -1028,7 +1028,8 @@ def __init__(self, *args, **kwargs):
         self.shutdown_event = threading.Event()
 
     def serve(self):
-        server_addr = self.get_localized_module_option('server_addr', '::')
+        server_addr = self.get_localized_module_option('server_addr',
+                DEFAULT_ADDR)
         server_port = self.get_localized_module_option(
             'server_port', DEFAULT_PORT)
         self.log.info("server_addr: %s server_port: %s" %