Octavia: Support uWSGI for API server

Currently Octavia API server still using eventlet-based HTTP servers,
it is generally considered more performant and flexible to run them
using a generic HTTP server that supports WSGI.

Change-Id: I75cfca8b660e0ea949527182e10b463972b3c0fb

octavia/Chart.yaml

@@ -16,7 +16,7 @@ apiVersion: v1
 appVersion: v1.0.0
 description: OpenStack-Helm Octavia
 name: octavia
-version: 0.2.10
+version: 0.2.11
 home: https://docs.openstack.org/octavia/latest/
 icon: https://www.openstack.org/themes/openstack/images/project-mascots/Octavia/OpenStack_Project_Octavia_vertical.png
 sources:

octavia/templates/bin/_octavia-api.sh.tpl

@@ -20,8 +20,7 @@ set -ex
 COMMAND="${@:-start}"
 
 function start () {
-  exec octavia-api \
+  exec uwsgi --ini /etc/octavia/octavia-api-uwsgi.ini
-        --config-file /etc/octavia/octavia.conf
 }
 
 function stop () {

octavia/templates/configmap-etc.yaml

@@ -88,6 +88,12 @@ limitations under the License.
 {{- $_ := tuple "oslo_messaging" "internal" "octavia" "amqp" . | include "helm-toolkit.endpoints.authenticated_transport_endpoint_uri_lookup" | set .Values.conf.octavia.DEFAULT "transport_url" -}}
 {{- end -}}
 
+{{- if empty (index .Values.conf.octavia_api_uwsgi.uwsgi "http-socket") -}}
+{{- $http_socket_port := tuple "load_balancer" "service" "api" . | include "helm-toolkit.endpoints.endpoint_port_lookup" | toString }}
+{{- $http_socket := printf "0.0.0.0:%s" $http_socket_port }}
+{{- $_ := set .Values.conf.octavia_api_uwsgi.uwsgi "http-socket" $http_socket -}}
+{{- end -}}
+
 {{- if and (empty .Values.conf.logging.handler_fluent) (has "fluent" .Values.conf.logging.handlers.keys) -}}
 {{- $fluentd_host := tuple "fluentd" "internal" $envAll | include "helm-toolkit.endpoints.hostname_namespaced_endpoint_lookup" }}
 {{- $fluentd_port := tuple "fluentd" "internal" "service" $envAll | include "helm-toolkit.endpoints.endpoint_port_lookup" }}
@@ -108,6 +114,7 @@ metadata:
 type: Opaque
 data:
   octavia.conf: {{ include "helm-toolkit.utils.to_oslo_conf" .Values.conf.octavia | b64enc }}
+  octavia-api-uwsgi.ini: {{ include "helm-toolkit.utils.to_oslo_conf" .Values.conf.octavia_api_uwsgi | b64enc }}
   logging.conf: {{ include "helm-toolkit.utils.to_oslo_conf" .Values.conf.logging | b64enc }}
 {{- end }}
 {{- end }}

octavia/templates/deployment-api.yaml

@@ -87,6 +87,10 @@ spec:
               mountPath: /etc/octavia/octavia.conf
               subPath: octavia.conf
               readOnly: true
+            - name: octavia-etc
+              mountPath: /etc/octavia/octavia-api-uwsgi.ini
+              subPath: octavia-api-uwsgi.ini
+              readOnly: true
             {{- if .Values.conf.octavia.DEFAULT.log_config_append }}
             - name: octavia-etc
               mountPath: {{ .Values.conf.octavia.DEFAULT.log_config_append }}

octavia/values.yaml

@@ -331,6 +331,23 @@ conf:
         priority: 0
         apply-to: all
         pattern: '(notifications)\.'
+  octavia_api_uwsgi:
+    uwsgi:
+      processes: 4
+      add-header: "Connection: close"
+      buffer-size: 65535
+      die-on-term: true
+      enable-threads: true
+      exit-on-reload: false
+      hook-master-start: unix_signal:15 gracefully_kill_them_all
+      lazy-apps: true
+      log-x-forwarded-for: true
+      master: true
+      procname-prefix-spaced: "octavia-api:"
+      route-user-agent: '^kube-probe.* donotlog:'
+      thunder-lock: true
+      worker-reload-mercy: 80
+      wsgi-file: /var/lib/openstack/bin/octavia-wsgi
 
 secrets:
   identity:

releasenotes/notes/octavia.yaml

@@ -14,4 +14,5 @@ octavia:
   - 0.2.8 Define service_type in keystone_authtoken to support application credentials with access rules
   - 0.2.9 Use default timeout and retry configs for haproxy_amphora
   - 0.2.10 Fix generating health_manager Role and RoleBinding
+  - 0.2.11 Uses uWSGI for API service
 ...