Enable TLS between Prometheus and Grafana

This patchset enables TLS path between Prometheus and Grafana.
Grafana pull data from Prometheus. As such, Prometheus is the
server and Grafana is the client for TLS handshake.

Change-Id: I50cb6f59472155415cff16a81ebaebd192064d65

grafana/Chart.yaml

@@ -15,7 +15,7 @@ apiVersion: v1
 appVersion: v7.3.6
 description: OpenStack-Helm Grafana
 name: grafana
-version: 0.1.4
+version: 0.1.5
 home: https://grafana.com/
 sources:
   - https://github.com/grafana/grafana

grafana/templates/certificates.yaml

@@ -1,17 +0,0 @@
-{{/*
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-  http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/}}
-
-{{- if .Values.manifests.certificates -}}
-{{  dict "envAll" . "service" "grafana" "type" "internal" | include "helm-toolkit.manifests.certificates" }}
-{{- end -}}

grafana/templates/deployment.yaml

@@ -81,6 +81,13 @@ spec:
                   key: GRAFANA_ADMIN_PASSWORD
             - name: PROMETHEUS_URL
               value: {{ tuple "monitoring" "internal" "api" $envAll | include "helm-toolkit.endpoints.keystone_endpoint_uri_lookup" }}
+{{- if .Values.manifests.certificates }}
+            - name: CACERT
+              valueFrom:
+                secretKeyRef:
+                  key: ca.crt
+                  name: prometheus-tls-api
+{{- end }}
 {{- if .Values.pod.env.grafana }}
 {{ include "helm-toolkit.utils.to_k8s_env_vars" .Values.pod.env.grafana | indent 12 }}
 {{- end }}

grafana/values.yaml

@@ -236,13 +236,6 @@ endpoints:
       public: grafana
     host_fqdn_override:
       default: null
-      # NOTE(srwilkers): this chart supports TLS for fqdn over-ridden public
-      # endpoints using the following format:
-      # public:
-      #   host: null
-      #   tls:
-      #     crt: null
-      #     key: null
     path:
       default: null
     scheme:
@@ -366,7 +359,6 @@ secrets:
     grafana:
       grafana:
         public: grafana-tls-public
-        internal: grafana-tls-api
   prometheus:
     user: prometheus-user-creds
 

grafana/values_overrides/tls.yaml

@@ -6,15 +6,26 @@ conf:
       ca_cert_path: /etc/mysql/certs/ca.crt
       client_key_path: /etc/mysql/certs/tls.key
       client_cert_path: /etc/mysql/certs/tls.crt
-endpoints:
-  grafana:
-    host_fqdn_override:
-      default:
-        tls:
-          secretName: grafana-tls-api
-          issuerRef:
-            name: ca-issuer
-            kind: ClusterIssuer
+  provisioning:
+    datasources:
+      template: |
+        {{ $prom_host := tuple "monitoring" "internal" . | include "helm-toolkit.endpoints.hostname_fqdn_endpoint_lookup" }}
+        {{ $prom_uri := printf "https://%s" $prom_host }}
+        apiVersion: 1
+        datasources:
+        - name: prometheus
+          type: prometheus
+          access: proxy
+          orgId: 1
+          editable: true
+          basicAuth: true
+          basicAuthUser: {{ .Values.endpoints.monitoring.auth.user.username }}
+          jsonData:
+            tlsAuthWithCACert: true
+          secureJsonData:
+            basicAuthPassword: {{ .Values.endpoints.monitoring.auth.user.password }}
+            tlsCACert: $CACERT
+          url: {{ $prom_uri }}
 manifests:
   certificates: true
 ...

releasenotes/notes/grafana.yaml

@@ -5,4 +5,5 @@ grafana:
   - 0.1.2 Update Grafana version
   - 0.1.3 Provision any dashboard as homepage
   - 0.1.4 Enable TLS for Grafana
+  - 0.1.5 Enable TLS between Grafana and Prometheus
 ...