Prometheus Operator: Allow user to expose grafana

This commit adds a new variable `grafana_ingress_host` where user can
provide the Ingress Host URL to expose Grafana on.

Signed-off-by: Suraj Deshmukh <suraj@kinvolk.io>

pkg/components/prometheus-operator/component.go

@@ -46,9 +46,12 @@ type CoreDNS struct {
 }
 
 type component struct {
-	GrafanaAdminPassword string   `hcl:"grafana_admin_password,attr"`
-	Namespace            string   `hcl:"namespace,optional"`
-	EtcdEndpoints        []string `hcl:"etcd_endpoints,optional"`
+	GrafanaAdminPassword string `hcl:"grafana_admin_password,attr"`
+	GrafanaIngressHost   string `hcl:"grafana_ingress_host,optional"`
+	ExposeGrafana        bool
+
+	Namespace     string   `hcl:"namespace,optional"`
+	EtcdEndpoints []string `hcl:"etcd_endpoints,optional"`
 
 	PrometheusOperatorNodeSelector map[string]string `hcl:"prometheus_operator_node_selector,optional"`
 
@@ -133,6 +136,11 @@ func (c *component) RenderManifests() (map[string]string, error) {
 		return nil, errors.Wrap(err, "load chart from assets")
 	}
 
+	// Expose Grafana if the ingress host is not empty.
+	if c.GrafanaIngressHost != "" {
+		c.ExposeGrafana = true
+	}
+
 	values, err := util.RenderTemplate(chartValuesTmpl, c)
 	if err != nil {
 		return nil, errors.Wrap(err, "render chart values template")

pkg/components/prometheus-operator/template.go

@@ -46,6 +46,8 @@ alertmanager:
           resources:
             requests:
               storage: "{{.AlertManagerStorageSize}}"
+
+
 grafana:
   adminPassword: {{.GrafanaAdminPassword}}
   testFramework:
@@ -55,6 +57,21 @@ grafana:
       searchNamespace: ALL
   rbac:
     pspUseAppArmor: false
+
+  ingress:
+    enabled: {{ .ExposeGrafana }}
+    annotations:
+      kubernetes.io/ingress.class: contour
+      kubernetes.io/tls-acme: "true"
+      cert-manager.io/cluster-issuer: "letsencrypt-production"
+    hosts:
+    - {{ .GrafanaIngressHost }}
+    tls:
+    - hosts:
+      - {{ .GrafanaIngressHost }}
+      secretName: {{ .GrafanaIngressHost }}-tls
+
+
 kubeEtcd:
   enabled: {{.Monitor.Etcd}}
   endpoints: {{.EtcdEndpoints}}