Merge "Use loadbalancer to connect to etcd"

ansible/roles/cinder/templates/cinder.conf.j2

@@ -238,9 +238,8 @@ verify_ssl_path = {{ openstack_cacert }}
 {% if cinder_coordination_backend == 'redis' %}
 backend_url = {{ redis_connection_string }}
 {% elif cinder_coordination_backend == 'etcd' %}
-# NOTE(yoctozepto): etcd-compatible tooz drivers do not support multiple endpoints here (verified in Stein, Train)
 # NOTE(yoctozepto): we must use etcd3gw (aka etcd3+http) due to issues with alternative (etcd3) and eventlet (as used by cinder)
 # see https://bugs.launchpad.net/kolla-ansible/+bug/1854932
 # and https://review.opendev.org/466098 for details
-backend_url = etcd3+{{ etcd_protocol }}://{{ 'api' | kolla_address(groups['etcd'][0]) | put_address_in_context('url') }}:{{ etcd_client_port }}
+backend_url = etcd3+{{ internal_protocol }}://{{ kolla_internal_vip_address }}:{{ etcd_client_port }}
 {% endif %}

ansible/roles/ironic/templates/ironic-inspector.conf.j2

@@ -83,9 +83,8 @@ dnsmasq_interface = {{ ironic_dnsmasq_interface }}
 {% if ironic_coordination_backend == 'redis' %}
 backend_url = {{ redis_connection_string }}
 {% elif ironic_coordination_backend == 'etcd' %}
-# NOTE(yoctozepto): etcd-compatible tooz drivers do not support multiple endpoints here (verified in Stein, Train)
 # NOTE(yoctozepto): we must use etcd3gw (aka etcd3+http) due to issues with alternative (etcd3) and eventlet (as used by cinder)
 # see https://bugs.launchpad.net/kolla-ansible/+bug/1854932
 # and https://review.opendev.org/466098 for details
-backend_url = etcd3+{{ etcd_protocol }}://{{ 'api' | kolla_address(groups['etcd'][0]) | put_address_in_context('url') }}:{{ etcd_client_port }}
+backend_url = etcd3+{{ internal_protocol }}://{{  kolla_internal_vip_address }}:{{ etcd_client_port }}
 {% endif %}

releasenotes/notes/use-loadbalancer-for-etcdgw-coordination-6704a8b1389bbabe.yaml

+---
+features:
+  - |
+    Services using etcd3gw via tooz now use etcd via haproxy. This removes
+    a single point of failure, where we hardcoded the first etcd host for
+    backend_url.