feat(argo-cd): Support AWS ALB Ingress with gRPC (#806)

* Support AWS ALB Ingress with GRPC

Signed-off-by: Thomas O'Neill <toneill818@gmail.com>
Signed-off-by: Thomas O'Neill <toneill@new-innov.com>

* Bump chart version

Signed-off-by: Marco Kilchhofer <marco@kilchhofer.info>

* Apply suggestions from code review

Signed-off-by: Marco Kilchhofer <marco@kilchhofer.info>

* Use single if statement

Signed-off-by: Thomas O'Neill <toneill@new-innov.com>

* Append -grpc to the service labels for ALB GRPC service

Signed-off-by: Thomas O'Neill <toneill@new-innov.com>

Co-authored-by: Thomas O'Neill <toneill@new-innov.com>
Co-authored-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>
Co-authored-by: Marco Kilchhofer <marco@kilchhofer.info>

charts/argo-cd/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 appVersion: 2.0.4
 description: A Helm chart for ArgoCD, a declarative, GitOps continuous delivery tool for Kubernetes.
 name: argo-cd
-version: 3.9.0
+version: 3.10.0
 home: https://github.com/argoproj/argo-helm
 icon: https://argoproj.github.io/argo-cd/assets/logo.png
 keywords:
@@ -21,5 +21,4 @@ dependencies:
     condition: redis-ha.enabled
 annotations:
   artifacthub.io/changes: |
-    - "[Added]: Ability to create network policies"
+    - "[Added]: Support AWS ALB Ingress with gRPC"
-    - "[Changed]: Fix icon url"

charts/argo-cd/README.md

@@ -305,6 +305,7 @@ NAME: my-release
 | server.ingressGrpc.labels | Additional ingress labels for dedicated [gRPC-ingress] | `{}` |
 | server.ingressGrpc.ingressClassName | Defines which ingress controller will implement the resource [gRPC-ingress] | `""` |
 | server.ingressGrpc.tls | Ingress TLS configuration for dedicated [gRPC-ingress] | `[]` |
+| server.ingressGrpc.isAWSALB | Setup up GRPC ingress to work with an AWS ALB | `false` |
 | server.route.enabled | Enable a OpenShift route for the server | `false` |
 | server.route.hostname | Hostname of OpenShift route | `""` |
 | server.lifecycle | PostStart and PreStop hooks configuration | `{}` |
@@ -429,3 +430,23 @@ through `xxx.extraArgs`
 | redis-ha.image.tag | Redis tag | `"6.2.1-alpine"` |
 
 [gRPC-ingress]: https://argoproj.github.io/argo-cd/operator-manual/ingress/
+
+
+### Using AWS ALB Ingress Controller With GRPC
+If you are using an AWS ALB Ingress controller, you will need to set `server.ingressGrpc.isAWSALB` to `true`. This will create a second service with the annotation `alb.ingress.kubernetes.io/backend-protocol-version: HTTP2` and modify the server ingress to add a condition annotation to route GRPC traffic to the new service. 
+
+Example:
+```yaml
+server:
+  ingress:
+    enabled: true
+    annotations: 
+      alb.ingress.kubernetes.io/backend-protocol: HTTPS
+      alb.ingress.kubernetes.io/listen-ports: '[{"HTTPS":443}]'
+      alb.ingress.kubernetes.io/scheme: internal
+      alb.ingress.kubernetes.io/target-type: ip
+  ingressGrpc:
+    enabled: true
+    isAWSALB: true
+      
+```

charts/argo-cd/templates/argocd-server/alb-grpc-service.yaml

@@ -0,0 +1,24 @@
+{{- if and .Values.server.ingressGrpc.enabled .Values.server.ingressGrpc.isAWSALB -}}
+apiVersion: v1
+kind: Service
+metadata:
+  annotations:
+    alb.ingress.kubernetes.io/backend-protocol-version: HTTP2 #This tells AWS to send traffic from the ALB using HTTP2. Can use GRPC as well if you want to leverage GRPC specific features
+  labels:
+    {{- include "argo-cd.labels" (dict "context" . "component" (print .Values.server.name "-gprc") "name" (print .Values.server.name "-grpc")) | nindent 4 }}
+  name: {{ template "argo-cd.server.fullname" . }}-grpc
+spec:
+  ports:
+  - name: {{ .Values.server.service.servicePortHttpName }}
+    protocol: TCP
+    port: {{ .Values.server.service.servicePortHttp }}
+    targetPort: {{- if .Values.server.service.namedTargetPort }} {{ .Values.server.name }} {{- else }} {{ .Values.server.containerPort }} {{- end }}
+  - name: {{ .Values.server.service.servicePortHttpsName }}
+    protocol: TCP
+    port: {{ .Values.server.service.servicePortHttps }}
+    targetPort: {{- if .Values.server.service.namedTargetPort }} {{ .Values.server.name }} {{- else }} {{ .Values.server.containerPort }} {{- end }}
+  selector:
+    {{- include "argo-cd.selectorLabels" (dict "context" . "name" .Values.server.name) | nindent 4 }}
+  sessionAffinity: None
+  type: ClusterIP
+{{- end -}}

charts/argo-cd/templates/argocd-server/ingress-grpc.yaml

@@ -1,4 +1,4 @@
-{{- if .Values.server.ingressGrpc.enabled -}}
+{{- if and .Values.server.ingressGrpc.enabled (not .Values.server.ingressGrpc.isAWSALB) -}}
 {{- $serviceName := include "argo-cd.server.fullname" . -}}
 {{- $servicePort := ternary .Values.server.service.servicePortHttps .Values.server.service.servicePortHttp .Values.server.ingressGrpc.https -}}
 {{- $paths := .Values.server.ingressGrpc.paths -}}

charts/argo-cd/templates/argocd-server/ingress.yaml

@@ -12,6 +12,10 @@ metadata:
   {{- range $key, $value := .Values.server.ingress.annotations }}
     {{ $key }}: {{ $value | quote }}
   {{- end }}
+  {{- if and .Values.server.ingressGrpc.isAWSALB .Values.server.ingressGrpc.enabled }}
+    alb.ingress.kubernetes.io/conditions.{{ template "argo-cd.server.fullname" . }}-grpc: |
+      [{"field":"http-header","httpHeaderConfig":{"httpHeaderName": "Content-Type", "values":["application/grpc"]}}]
+  {{- end }}
 {{- end }}
   name: {{ template "argo-cd.server.fullname" . }}
   labels:
@@ -35,6 +39,26 @@ spec:
           {{- toYaml $extraPaths | nindent 10 }}
           {{- end }}
           {{- range $p := $paths }}
+          {{- if and $.Values.server.ingressGrpc.isAWSALB $.Values.server.ingressGrpc.enabled }}
+          - path: {{ $p }}
+            {{- if eq (include "argo-cd.ingress.apiVersion" $) "networking.k8s.io/v1" }}
+            pathType: Prefix
+            {{- end }}
+            backend:
+              {{- if eq (include "argo-cd.ingress.apiVersion" $) "networking.k8s.io/v1" }}
+              service:
+                name: {{ template "argo-cd.server.fullname" $ }}-grpc
+                port:
+                  {{- if kindIs "float64" $servicePort }}
+                  number: {{ $servicePort }}
+                  {{- else }}
+                  name: {{ $servicePort }}
+                  {{- end }}
+              {{- else }}
+              serviceName: {{ template "argo-cd.server.fullname" $ }}-grpc
+              servicePort: {{ $servicePort }}
+              {{- end }}
+            {{- end }}
           - path: {{ $p }}
             {{- if eq (include "argo-cd.ingress.apiVersion" $) "networking.k8s.io/v1" }}
             pathType: {{ $pathType }}

charts/argo-cd/values.yaml

@@ -601,6 +601,7 @@ server:
   # https://argoproj.github.io/argo-cd/operator-manual/ingress/
   ingressGrpc:
     enabled: false
+    isAWSALB: false
     annotations: {}
     labels: {}
     ingressClassName: ""