Add kubernetes example for hotrod app (#3645)

* Add kubernetes example for hotrod app

Signed-off-by: Brandon High <highb@users.noreply.github.com>

* Remove grafana-agent optional configuration

Signed-off-by: Brandon High <highb@users.noreply.github.com>

* Add redis container to kubernetes deployment example

Also reduces the cpu/memory limits as they were excessive initially.

Signed-off-by: Brandon High <highb@users.noreply.github.com>

* Move kubernetes example into hotrod/kubernetes

Signed-off-by: Brandon High <highb@users.noreply.github.com>

* Add jaeger all-in-one to kubernetes example

Signed-off-by: Brandon High <highb@users.noreply.github.com>

* Add one-liner for port-forward to see traces

Signed-off-by: Brandon High <highb@users.noreply.github.com>

* Tracing port needs to be UDP not TCP

Signed-off-by: Brandon High <highb@users.noreply.github.com>

* Update examples/hotrod/README.md

Co-authored-by: Yuri Shkuro <yurishkuro@users.noreply.github.com>
Signed-off-by: Brandon High <highb@users.noreply.github.com>

* Move up kubernetes section in hotrod example README

Signed-off-by: Brandon High <highb@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Yuri Shkuro <yurishkuro@users.noreply.github.com>
Signed-off-by: Brandon High <highb@users.noreply.github.com>

* Add cleanup to k8s example READMEs

Signed-off-by: Brandon High <highb@users.noreply.github.com>

* Remove redis from hotrod example

Signed-off-by: Brandon High <highb@users.noreply.github.com>

* Use pod local/localhost for jaeger-all-in-one

Signed-off-by: Brandon High <highb@users.noreply.github.com>

Co-authored-by: Yuri Shkuro <yurishkuro@users.noreply.github.com>

examples/hotrod/README.md

@@ -28,6 +28,20 @@ to view the traces. A tutorial / walkthrough is available:
 
 Alternatively, you can run each component separately as described below.
 
+### Run everything in Kubernetes
+
+```bash
+kustomize build ./kubernetes | kubectl apply -f -
+kubectl port-forward -n example-hotrod service/example-hotrod 8080:frontend
+# In another terminal
+kubectl port-forward -n example-hotrod service/jaeger 16686:frontend
+
+# To cleanup
+kustomize build ./kubernetes | kubectl delete -f -
+```
+
+Access Jaeger UI at http://localhost:16686 and HotROD app at http://localhost:8080
+
 ### Run Jaeger backend
 
 An all-in-one Jaeger backend is packaged as a Docker container with in-memory storage.

examples/hotrod/kubernetes/README.md

@@ -0,0 +1,17 @@
+# Hot R.O.D. - Rides on Demand on Kubernetes
+
+Example k8s manifests for deploying the [hotrod app](..) to your k8s environment of choice. e.g. minikube, k3s, EKS, GKE
+
+## Usage
+
+```bash
+kustomize build . | kubectl apply -f -
+kubectl port-forward -n example-hotrod service/example-hotrod 8080:frontend
+# In another terminal
+kubectl port-forward -n example-hotrod service/jaeger 16686:frontend
+
+# To cleanup
+kustomize build . | kubectl delete -f -
+```
+
+Access Jaeger UI at <http://localhost:16686> and HotROD app at <http://localhost:8080>

examples/hotrod/kubernetes/base/hotrod/deployment.yaml

@@ -0,0 +1,40 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: example-hotrod
+  name: example-hotrod
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: example-hotrod
+  strategy: {}
+  template:
+    metadata:
+      labels:
+        app: example-hotrod
+    spec:
+      containers:
+      - image: jaegertracing/example-hotrod:latest
+        name: example-hotrod
+        args: ["all"]
+        env:
+          - name: JAEGER_AGENT_HOST
+            value: localhost
+          - name: JAEGER_AGENT_PORT
+            value: "6831"
+        ports:
+          - containerPort: 8080
+            name: frontend
+          - containerPort: 8081
+            name: customer
+          - containerPort: 8083
+            name: route
+        resources:
+          limits:
+            cpu: 100m
+            memory: 100M
+          requests:
+            cpu: 100m
+            memory: 100M

examples/hotrod/kubernetes/base/hotrod/kustomization.yaml

@@ -0,0 +1,6 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - deployment.yaml
+  - service.yaml

examples/hotrod/kubernetes/base/hotrod/service.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: example-hotrod
+spec:
+  selector:
+    app: example-hotrod
+  ports:
+    - name: frontend
+      protocol: TCP
+      port: 8080
+      targetPort: frontend

examples/hotrod/kubernetes/base/jaeger-all-in-one/kustomization.yaml

@@ -0,0 +1,33 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+bases:
+  - ../hotrod
+
+resources:
+  - service.yaml
+
+patches:
+  - target:
+      group: apps
+      version: v1
+      kind: Deployment
+      name: example-hotrod
+    patch: |-
+      - op: add
+        path: /spec/template/spec/containers/-
+        value:
+          image: jaegertracing/all-in-one:latest
+          name: jaeger
+          ports:
+            - containerPort: 6831
+              name: tracing-jaeger
+            - containerPort: 16686
+              name: frontend-jaeger
+          resources:
+            limits:
+              cpu: 100m
+              memory: 100M
+            requests:
+              cpu: 100m
+              memory: 100M

examples/hotrod/kubernetes/base/jaeger-all-in-one/service.yaml

@@ -0,0 +1,16 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: jaeger
+spec:
+  selector:
+    app: example-hotrod
+  ports:
+    - name: tracing
+      protocol: UDP
+      port: 6831
+      targetPort: tracing-jaeger
+    - name: frontend
+      protocol: TCP
+      port: 16686
+      targetPort: frontend-jaeger

examples/hotrod/kubernetes/kustomization.yaml

@@ -0,0 +1,12 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+bases:
+# If you only want the hotrod application, uncomment this line and comment out jaeger-all-in-one
+#  - base/hotrod
+  - base/jaeger
+
+namespace: example-hotrod
+
+resources:
+  - namespace.yaml

examples/hotrod/kubernetes/namespace.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: example-hotrod