Merge "Fixed down server issue after reloading keepalived"

octavia/amphorae/backends/agent/api_server/keepalivedlvs.py

@@ -198,6 +198,13 @@ class KeepalivedLvs(udp_listener_base.UdpListenerApiServerBase):
                 message='Invalid Request',
                 details="Unknown action: {0}".format(action)), status=400)
 
+        # When octavia requests a reload of keepalived, force a restart since
+        # a keepalived reload doesn't restore members in their initial state.
+        #
+        # TODO(gthiemonge) remove this when keepalived>=2.0.14 is widely use
+        if action == consts.AMP_ACTION_RELOAD:
+            action = consts.AMP_ACTION_RESTART
+
         self._check_udp_listener_exists(listener_id)
         if action == consts.AMP_ACTION_RELOAD:
             if consts.OFFLINE == self._check_udp_listener_status(listener_id):

octavia/common/constants.py

@@ -558,6 +558,7 @@ SYSCTL_CMD = '/sbin/sysctl'
 AMP_ACTION_START = 'start'
 AMP_ACTION_STOP = 'stop'
 AMP_ACTION_RELOAD = 'reload'
+AMP_ACTION_RESTART = 'restart'
 GLANCE_IMAGE_ACTIVE = 'active'
 
 INIT_SYSTEMD = 'systemd'

releasenotes/notes/fix-udp-server-status-bug-db4d3e38bcdf0554.yaml

@@ -0,0 +1,12 @@
+---
+issues:
+  - |
+    When a load balancer with a UDP listener is updated, the listener service
+    is restarted, which causes an interruption of the flow of traffic during a
+    short period of time. This issue is caused by a keepalived bug
+    (https://github.com/acassen/keepalived/issues/1163) that was fixed in
+    keepalived 2.0.14, but this package is not yet provided by distributions.
+fixes:
+  - |
+    Fix a bug that prevented UDP servers to be restored as members of a pool
+    after removing a health monitor resource.