add example for custom ingress (#146)

Author: Mike Terhar

examples/ingress/ingress.values.yaml

@@ -0,0 +1,26 @@
+# Using coder with ingress in versions from 1.21 and newer
+# Coder's built-in ingress controller is no longer packaged
+# the coderd pod does not require a fanout so it is exposed
+# by creating a LoadBalancer service
+coderd:
+  serviceNext: true
+  devurlsHost: '*.devurls.coderhost.com'
+  serviceSpec:
+    type: ClusterIP
+    # The values.yaml file in the chart includes LoadBalancer
+    # specs which need to have the keys removed using null
+    # this does not work as a sub-chart
+    loadBalancerIP: null
+    externalTrafficPolicy: null
+    loadBalancerSourceRanges: null
+# Add the ingress values section to enable the ingress resource
+# without the controller
+ingress:
+  # Enable set to true creates the ingress resource
+  enable: true
+  # Ingress needs a host name so it can share a controller
+  host: 'coder.coderhost.com'
+  # useDefault set to false disables creation of the ingress controller
+  useDefault: false
+  # add annotations for TLS issuers and such
+  annotations: {}

templates/ingress.yaml

@@ -409,3 +409,38 @@ spec:
   {{- end }}
 {{- end }}
 ---
+{{- if and (merge .Values dict | dig "coderd" "serviceNext" true) (merge .Values dict | dig "ingress" "enable" true) }}
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: coderd-ingress
+  namespace: {{ .Release.Namespace | quote }}
+  annotations:
+    nginx.ingress.kubernetes.io/proxy-body-size: "0"
+  {{- range $key, $value := merge .Values dict | dig "ingress" "annotations" dict }}
+    {{ $key }}: {{ $value | quote }}
+  {{- end }}
+spec:
+{{- include "coder.ingress.tls" . }}
+  rules:
+  - host: {{ merge .Values dict | dig "ingress" "host" "" | quote }}
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: {{ include "coder.serviceName" . }}
+            port:
+              number: 80
+  - host: {{ merge .Values dict | dig "coderd" "devurlsHost" "" | quote }}
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: {{ include "coder.serviceName" . }}
+            port:
+              number: 80
+{{- end }}