Add quorum queues support for service

This change implements and enables by default quorum support
for rabbitmq as well as providing default variables to globally tune
it's behaviour.

In order to ensure upgrade path and ability to switch back to HA queues
we change vhost names with removing leading `/`, as enabling quorum
requires to remove exchange which is tricky thing to do with running
services.

Change-Id: I4781a0c23274b145970b3269e517c2a62497acc4

defaults/main.yml

@@ -109,7 +109,13 @@ octavia_oslomsg_rpc_servers: "{{ oslomsg_rpc_servers | default('127.0.0.1') }}"
 octavia_oslomsg_rpc_port: "{{ oslomsg_rpc_port | default('5672') }}"
 octavia_oslomsg_rpc_use_ssl: "{{ oslomsg_rpc_use_ssl | default(False) }}"
 octavia_oslomsg_rpc_userid: octavia
-octavia_oslomsg_rpc_vhost: /octavia
+# vhost name depends on value of oslomsg_rabbit_quorum_queues. In case quorum queues
+# are not used - vhost name will be prefixed with leading `/`.
+octavia_oslomsg_rpc_vhost:
+  - name: /octavia
+    state: "{{ octavia_oslomsg_rabbit_quorum_queues | ternary('absent', 'present') }}"
+  - name: octavia
+    state: "{{ octavia_oslomsg_rabbit_quorum_queues | ternary('present', 'absent') }}"
 octavia_oslomsg_rpc_ssl_version: "{{ oslomsg_rpc_ssl_version | default('TLSv1_2') }}"
 octavia_oslomsg_rpc_ssl_ca_file: "{{ oslomsg_rpc_ssl_ca_file | default('') }}"
 
@@ -127,6 +133,11 @@ octavia_oslomsg_notify_vhost: "{{ octavia_oslomsg_rpc_vhost }}"
 octavia_oslomsg_notify_ssl_version: "{{ oslomsg_notify_ssl_version | default('TLSv1_2') }}"
 octavia_oslomsg_notify_ssl_ca_file: "{{ oslomsg_notify_ssl_ca_file | default('') }}"
 
+## RabbitMQ integration
+octavia_oslomsg_rabbit_quorum_queues: "{{ oslomsg_rabbit_quorum_queues | default(True) }}"
+octavia_oslomsg_rabbit_quorum_delivery_limit: "{{ oslomsg_rabbit_quorum_delivery_limit | default(0) }}"
+octavia_oslomsg_rabbit_quorum_max_memory_bytes: "{{ oslomsg_rabbit_quorum_max_memory_bytes | default(0) }}"
+
 ## (Qdrouterd) integration
 # TODO(ansmith): Change structure when more backends will be supported
 octavia_oslomsg_amqp1_enabled: "{{ octavia_oslomsg_rpc_transport == 'amqp' }}"

templates/octavia.conf.j2

@@ -3,7 +3,7 @@ debug = {{ debug }}
 use_journal = True
 executor_thread_pool_size = {{ octavia_rpc_thread_pool_size }}
 rpc_conn_pool_size = {{ octavia_rpc_conn_pool_size }}
-transport_url = {{ octavia_oslomsg_rpc_transport }}://{% for host in octavia_oslomsg_rpc_servers.split(',') %}{{ octavia_oslomsg_rpc_userid }}:{{ octavia_oslomsg_rpc_password }}@{{ host }}:{{ octavia_oslomsg_rpc_port }}{% if not loop.last %},{% else %}/{{ octavia_oslomsg_rpc_vhost }}{% if octavia_oslomsg_rpc_use_ssl | bool %}?ssl=1&ssl_version={{ octavia_oslomsg_rpc_ssl_version }}&ssl_ca_file={{ octavia_oslomsg_rpc_ssl_ca_file }}{% else %}?ssl=0{% endif %}{% endif %}{% endfor %}
+transport_url = {{ octavia_oslomsg_rpc_transport }}://{% for host in octavia_oslomsg_rpc_servers.split(',') %}{{ octavia_oslomsg_rpc_userid }}:{{ octavia_oslomsg_rpc_password }}@{{ host }}:{{ octavia_oslomsg_rpc_port }}{% if not loop.last %},{% else %}/{{ _octavia_oslomsg_rpc_vhost_conf }}{% if octavia_oslomsg_rpc_use_ssl | bool %}?ssl=1&ssl_version={{ octavia_oslomsg_rpc_ssl_version }}&ssl_ca_file={{ octavia_oslomsg_rpc_ssl_ca_file }}{% else %}?ssl=0{% endif %}{% endif %}{% endfor %}
 
 [api_settings]
 bind_host = {{ octavia_uwsgi_bind_address }}
@@ -23,10 +23,13 @@ topic = octavia_prov
 
 [oslo_messaging_rabbit]
 ssl = {{ octavia_oslomsg_rpc_use_ssl }}
+rabbit_quorum_queue = {{ octavia_oslomsg_rabbit_quorum_queues }}
+rabbit_quorum_delivery_limit = {{ octavia_oslomsg_rabbit_quorum_delivery_limit }}
+rabbit_quorum_max_memory_bytes = {{ octavia_oslomsg_rabbit_quorum_max_memory_bytes }}
 
 [oslo_messaging_notifications]
 driver = {{ (octavia_ceilometer_enabled | bool) | ternary('messagingv2', 'noop') }}
-transport_url = {{ octavia_oslomsg_notify_transport }}://{% for host in octavia_oslomsg_notify_servers.split(',') %}{{ octavia_oslomsg_notify_userid }}:{{ octavia_oslomsg_notify_password }}@{{ host }}:{{ octavia_oslomsg_notify_port }}{% if not loop.last %},{% else %}/{{ octavia_oslomsg_notify_vhost }}{% if octavia_oslomsg_notify_use_ssl | bool %}?ssl=1&ssl_version={{ octavia_oslomsg_notify_ssl_version }}&ssl_ca_file={{ octavia_oslomsg_notify_ssl_ca_file }}{% else %}?ssl=0{% endif %}{% endif %}{% endfor %}
+transport_url = {{ octavia_oslomsg_notify_transport }}://{% for host in octavia_oslomsg_notify_servers.split(',') %}{{ octavia_oslomsg_notify_userid }}:{{ octavia_oslomsg_notify_password }}@{{ host }}:{{ octavia_oslomsg_notify_port }}{% if not loop.last %},{% else %}/{{ _octavia_oslomsg_notify_vhost_conf }}{% if octavia_oslomsg_notify_use_ssl | bool %}?ssl=1&ssl_version={{ octavia_oslomsg_notify_ssl_version }}&ssl_ca_file={{ octavia_oslomsg_notify_ssl_ca_file }}{% else %}?ssl=0{% endif %}{% endif %}{% endfor %}
 
 [database]
 connection = mysql+pymysql://{{ octavia_galera_user }}:{{ octavia_container_mysql_password }}@{{ octavia_galera_address }}:{{ octavia_galera_port }}/{{ octavia_galera_database }}?charset=utf8{% if octavia_galera_use_ssl | bool %}&ssl_verify_cert=true{% if octavia_galera_ssl_ca_cert | length > 0 %}&ssl_ca={{ octavia_galera_ssl_ca_cert }}{% endif %}{% endif +%}

vars/main.yml

@@ -19,6 +19,18 @@ _octavia_is_first_play_host: >-
       inventory_hostname == (groups[octavia_services['octavia-api']['group']] | intersect(ansible_play_hosts)) | first) | bool
   }}
 
+_octavia_oslomsg_rpc_vhost_conf: >-
+  {{
+    (octavia_oslomsg_rpc_vhost is string) | ternary(
+      octavia_oslomsg_rpc_vhost, octavia_oslomsg_rpc_vhost | selectattr('state', 'eq', 'present') | map(attribute='name') | first)
+  }}
+
+_octavia_oslomsg_notify_vhost_conf: >-
+  {{
+    (octavia_oslomsg_notify_vhost is string) | ternary(
+      octavia_oslomsg_notify_vhost, octavia_oslomsg_notify_vhost | selectattr('state', 'eq', 'present') | map(attribute='name') | first)
+  }}
+
 #
 # Compile a list of the services on a host based on whether
 # the host is in the host group and the service is enabled.