*: add example for running on kubernetes

cmd/example-app/main.go

@@ -94,7 +94,7 @@ func cmd() *cobra.Command {
 				}
 
 				// This sets the OAuth2 client and oidc client.
-				a.ctx = context.WithValue(a.ctx, oauth2.HTTPClient, &client)
+				a.ctx = context.WithValue(a.ctx, oauth2.HTTPClient, client)
 			}
 
 			// TODO(ericchiang): Retry with backoff

cmd/poke/config.go

@@ -47,23 +47,25 @@ func (s *Storage) UnmarshalYAML(unmarshal func(interface{}) error) error {
 		return err
 	}
 	s.Type = storageMeta.Type
-	var c struct {
-		Config StorageConfig `yaml:"config"`
-	}
 	// TODO(ericchiang): replace this with a registration process.
+	var err error
 	switch storageMeta.Type {
 	case "kubernetes":
-		c.Config = &kubernetes.Config{}
+		var config struct {
+			Config kubernetes.Config `yaml:"config"`
+		}
+		err = unmarshal(&config)
+		s.Config = &config.Config
 	case "memory":
-		c.Config = &memory.Config{}
+		var config struct {
+			Config memory.Config `yaml:"config"`
+		}
+		err = unmarshal(&config)
+		s.Config = &config.Config
 	default:
 		return fmt.Errorf("unknown storage type %q", storageMeta.Type)
 	}
-	if err := unmarshal(c); err != nil {
-		return err
-	}
-	s.Config = c.Config
-	return nil
+	return err
 }
 
 // StorageConfig is a configuration that can create a storage.

example/k8s/.gitignore

@@ -0,0 +1 @@
+ssl/

example/k8s/README.md

@@ -0,0 +1,19 @@
+# Running dex as the Kubernetes
+
+```
+kubectl create -f thirdpartyresources.yaml
+kubectl create configmap dex-config --from-file=config.yaml=config-k8s.yaml
+kubectl create -f deployment.yaml
+```
+
+```
+kubectl create -f https://raw.githubusercontent.com/kubernetes/contrib/master/ingress/controllers/nginx/rc.yaml
+./gencert.sh
+kubectl create secret tls dex.example.com.tls --cert=ssl/cert.pem --key=ssl/key.pem
+kubectl create -f dex-ingress.yaml
+```
+
+```
+kubectl create -f client.yaml
+../../bin/example-app --issuer https://dex.example.com --issuer-root-ca ssl/ca.pem
+```

example/k8s/client.yaml

@@ -3,6 +3,7 @@ apiVersion: oauth2clients.oidc.coreos.com/v1
 metadata:
   name: example-app
   namespace: default
+
 secret: ZXhhbXBsZS1hcHAtc2VjcmV0
 redirectURIs:
 - http://127.0.0.1:5555/callback

example/k8s/config-k8s.yaml

@@ -0,0 +1,13 @@
+issuer: https://dex.example.com
+storage:
+  type: kubernetes
+  config:
+    inCluster: true
+
+web:
+  http: 0.0.0.0:5556
+
+connectors:
+- type: mock
+  id: mock
+  name: Mock

example/k8s/deployment.yaml

@@ -0,0 +1,38 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  labels:
+    app: dex
+  name: dex
+spec:
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: dex
+    spec:
+      containers:
+      - image: quay.io/ericchiang/poke
+        name: dex
+        command:
+        - "/poke"
+        - "serve"
+        - "/dex/config.yaml"
+        env:
+        # A value required for dex's Kubernetes client.
+        - name: KUBERNETES_POD_NAMESPACE
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace
+
+        ports:
+        - containerPort: 5556
+          name: worker-port
+
+        volumeMounts:
+        - name: config-volume
+          mountPath: /dex
+      volumes:
+      - name: config-volume
+        configMap:
+          name: dex-config

example/k8s/dex-ingress.yaml

@@ -0,0 +1,28 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: dex
+spec:
+  ports:
+    - name: dex
+      port: 5556
+  selector:
+    app: dex
+---
+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: dex
+spec:
+  tls:
+  - secretName: dex.example.com.tls
+    hosts:
+    - dex.example.com
+  rules:
+  - host: dex.example.com
+    http:
+      paths:
+      - backend:
+          serviceName: dex
+          servicePort: 5556
+        path: /

example/k8s/gencert.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+mkdir -p ssl
+
+cat << EOF > ssl/req.cnf
+[req]
+req_extensions = v3_req
+distinguished_name = req_distinguished_name
+
+[req_distinguished_name]
+
+[ v3_req ]
+basicConstraints = CA:FALSE
+keyUsage = nonRepudiation, digitalSignature, keyEncipherment
+subjectAltName = @alt_names
+
+[alt_names]
+DNS.1 = dex.example.com
+EOF
+
+openssl genrsa -out ssl/ca-key.pem 2048
+openssl req -x509 -new -nodes -key ssl/ca-key.pem -days 10 -out ssl/ca.pem -subj "/CN=kube-ca"
+
+openssl genrsa -out ssl/key.pem 2048
+openssl req -new -key ssl/key.pem -out ssl/csr.pem -subj "/CN=kube-ca" -config ssl/req.cnf
+openssl x509 -req -in ssl/csr.pem -CA ssl/ca.pem -CAkey ssl/ca-key.pem -CAcreateserial -out ssl/cert.pem -days 10 -extensions v3_req -extfile ssl/req.cnf

example/k8s/nginx-ingress.yaml

@@ -0,0 +1,100 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: default-http-backend
+  labels:
+    k8s-app: default-http-backend
+spec:
+  ports:
+  - port: 80
+    targetPort: 8080
+    protocol: TCP
+    name: http
+  selector:
+    k8s-app: default-http-backend
+---
+apiVersion: v1
+kind: ReplicationController
+metadata:
+  name: default-http-backend
+spec:
+  replicas: 1
+  selector:
+    k8s-app: default-http-backend
+  template:
+    metadata:
+      labels:
+        k8s-app: default-http-backend
+    spec:
+      terminationGracePeriodSeconds: 60
+      containers:
+      - name: default-http-backend
+        # Any image is permissable as long as:
+        # 1. It serves a 404 page at /
+        # 2. It serves 200 on a /healthz endpoint
+        image: gcr.io/google_containers/defaultbackend:1.0
+        livenessProbe:
+          httpGet:
+            path: /healthz
+            port: 8080
+            scheme: HTTP
+          initialDelaySeconds: 30
+          timeoutSeconds: 5
+        ports:
+        - containerPort: 8080
+        resources:
+          limits:
+            cpu: 10m
+            memory: 20Mi
+          requests:
+            cpu: 10m
+            memory: 20Mi
+---
+apiVersion: extensions/v1beta1
+kind: DaemonSet
+metadata:
+  name: nginx-ingress-controller
+  labels:
+    k8s-app: nginx-ingress-lb
+spec:
+  replicas: 1
+  selector:
+    web-frontend
+  template:
+    metadata:
+      labels:
+        k8s-app: nginx-ingress-lb
+        name: nginx-ingress-lb
+    spec:
+      terminationGracePeriodSeconds: 60
+      containers:
+      - image: gcr.io/google_containers/nginx-ingress-controller:0.8.2
+        name: nginx-ingress-lb
+        imagePullPolicy: Always
+        livenessProbe:
+          httpGet:
+            path: /healthz
+            port: 10249
+            scheme: HTTP
+          initialDelaySeconds: 30
+          timeoutSeconds: 5
+        # use downward API
+        env:
+          - name: POD_NAME
+            valueFrom:
+              fieldRef:
+                fieldPath: metadata.name
+          - name: POD_NAMESPACE
+            valueFrom:
+              fieldRef:
+                fieldPath: metadata.namespace
+        ports:
+        - containerPort: 443
+          hostPort: 443
+        # we expose 18080 to access nginx stats in url /nginx-status
+        # this is optional
+        - containerPort: 18080
+          hostPort: 18080
+        args:
+        - /nginx-ingress-controller
+        - --default-backend-service=default/default-http-backend