MariaDB: Clean up values file and exporter start script

This PS cleans up the default values file, and also allows some
aspects of the mysql exporter's operation to be configured.

Change-Id: I577e3237ca0bfe3665e7a57cf2a9364baea7c24a
Signed-off-by: Pete Birley <pete@port.direct>

mariadb/templates/etc/_20-override.cnf.tpl

@@ -14,4 +14,4 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */}}
 
-{{ .Values.database.config_override }}
+{{ .Values.conf.database.config_override }}

mariadb/templates/monitoring/prometheus/bin/_mysqld-exporter.sh.tpl

@@ -17,14 +17,8 @@ limitations under the License.
 */}}
 
 set -ex
-COMMAND="${@:-start}"
 
-function start () {
-  exec /bin/mysqld_exporter -config.my-cnf=/etc/mysql/mysql_user.cnf
-}
-
-function stop () {
-  kill -TERM 1
-}
-
-$COMMAND
+exec /bin/mysqld_exporter \
+  -config.my-cnf=/etc/mysql/mysql_user.cnf \
+  -web.listen-address="${POD_IP}:${LISTEN_PORT}" \
+  -web.telemetry-path="$TELEMETRY_PATH"

mariadb/templates/monitoring/prometheus/exporter-deployment.yaml

@@ -54,10 +54,9 @@ spec:
 {{ tuple $envAll $envAll.Values.pod.resources.prometheus_mysql_exporter | include "helm-toolkit.snippets.kubernetes_resources" | indent 10 }}
           command:
             - /tmp/mysqld-exporter.sh
-            - start
           ports:
             - name: metrics
-              containerPort: {{ .Values.network.prometheus_mysql_exporter.port }}
+              containerPort: {{ tuple "prometheus_mysql_exporter" "internal" "metrics" . | include "helm-toolkit.endpoints.endpoint_port_lookup" }}
           env:
             - name: EXPORTER_USER
               valueFrom:
@@ -74,6 +73,14 @@ spec:
                 secretKeyRef:
                   name: mysql-exporter-secrets
                   key: DATA_SOURCE_NAME
+            - name: POD_IP
+              valueFrom:
+                fieldRef:
+                  fieldPath: status.podIP
+            - name: LISTEN_PORT
+              value: {{ tuple "prometheus_mysql_exporter" "internal" "metrics" . | include "helm-toolkit.endpoints.endpoint_port_lookup" | quote }}
+            - name: TELEMETRY_PATH
+              value: {{ tuple "prometheus_mysql_exporter" "internal" "metrics" . | include "helm-toolkit.endpoints.keystone_endpoint_path_lookup" | quote }}
           volumeMounts:
             - name: mysql-exporter-secrets
               mountPath: /etc/mysql/mysql_user.cnf

mariadb/templates/monitoring/prometheus/exporter-service.yaml

@@ -31,7 +31,7 @@ metadata:
 spec:
   ports:
   - name: metrics
-    port: {{ .Values.network.prometheus_mysql_exporter.port }}
+    port: {{ tuple "prometheus_mysql_exporter" "internal" "metrics" . | include "helm-toolkit.endpoints.endpoint_port_lookup" }}
   selector:
 {{ tuple $envAll "prometheus_mysql_exporter" "exporter" | include "helm-toolkit.snippets.kubernetes_metadata_labels" | indent 4 }}
 {{- end }}

mariadb/values.yaml

@@ -226,8 +226,6 @@ dependencies:
         - endpoint: internal
           service: oslo_db
 
-force_bootstrap: false
-
 volume:
   chown_on_start: true
   enabled: true
@@ -271,24 +269,19 @@ conf:
       --single-transaction --quick --skip-opt
       --add-drop-database --add-drop-table --databases
     days_of_backup_to_keep: 3
-
-database:
-  config_override: null
-  # Any configuration here will override the base config.
-  # config_override: |-
-  #   [mysqld]
-  #   wsrep_slave_threads=1
+  database:
+    config_override: null
+    # Any configuration here will override the base config.
+    # config_override: |-
+    #   [mysqld]
+    #   wsrep_slave_threads=1
 
 monitoring:
   prometheus:
-    enabled: false
+    enabled: true
     mysqld_exporter:
       scrape: true
 
-network:
-  prometheus_mysql_exporter:
-    port: 9104
-
 # typically overridden by environmental
 # values, but should include all endpoints
 # required by this chart