[Feature] Add an example for RayService high availability

ray-operator/config/samples/ray-service.high-availability.yaml

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+kind: ConfigMap
+apiVersion: v1
+metadata:
+  name: redis-config
+  labels:
+    app: redis
+data:
+  redis.conf: |-
+    dir /data
+    port 6379
+    bind 0.0.0.0
+    appendonly yes
+    protected-mode no
+    requirepass 5241590000000000
+    pidfile /data/redis-6379.pid
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: redis
+  labels:
+    app: redis
+spec:
+  type: ClusterIP
+  ports:
+    - name: redis
+      port: 6379
+  selector:
+    app: redis
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: redis
+  labels:
+    app: redis
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: redis
+  template:
+    metadata:
+      labels:
+        app: redis
+    spec:
+      containers:
+        - name: redis
+          image: redis:5.0.8
+          command:
+            - "sh"
+            - "-c"
+            - "redis-server /usr/local/etc/redis/redis.conf"
+          ports:
+            - containerPort: 6379
+          volumeMounts:
+            - name: config
+              mountPath: /usr/local/etc/redis/redis.conf
+              subPath: redis.conf
+      volumes:
+        - name: config
+          configMap:
+            name: redis-config
+---
+# Redis password
+apiVersion: v1
+kind: Secret
+metadata:
+  name: redis-password-secret
+type: Opaque
+data:
+  # echo -n "5241590000000000" | base64
+  password: NTI0MTU5MDAwMDAwMDAwMA==
+---
+apiVersion: ray.io/v1
+kind: RayService
+metadata:
+  name: rayservice-ha
+  annotations:
+    ray.io/ft-enabled: "true"
+spec:
+  serviceUnhealthySecondThreshold: 900 # Config for the health check threshold for Ray Serve applications. Default value is 900.
+  deploymentUnhealthySecondThreshold: 300 # Config for the health check threshold for Ray dashboard agent. Default value is 300.
+  serveConfigV2: |
+    applications:
+      - name: fruit_app
+        import_path: fruit.deployment_graph
+        route_prefix: /fruit
+        runtime_env:
+          working_dir: "https://github.com/ray-project/test_dag/archive/41d09119cbdf8450599f993f51318e9e27c59098.zip"
+        deployments:
+          - name: MangoStand
+            num_replicas: 2
+            max_replicas_per_node: 1
+            user_config:
+              price: 3
+            ray_actor_options:
+              num_cpus: 0.1
+          - name: OrangeStand
+            num_replicas: 2
+            max_replicas_per_node: 1
+            user_config:
+              price: 2
+            ray_actor_options:
+              num_cpus: 0.1
+          - name: PearStand
+            num_replicas: 2
+            max_replicas_per_node: 1
+            user_config:
+              price: 1
+            ray_actor_options:
+              num_cpus: 0.1
+          - name: FruitMarket
+            num_replicas: 2
+            max_replicas_per_node: 1
+            ray_actor_options:
+              num_cpus: 0.1
+          - name: DAGDriver
+            num_replicas: 2
+            max_replicas_per_node: 1
+            ray_actor_options:
+              num_cpus: 0.1
+  rayClusterConfig:
+    rayVersion: '2.7.0' # should match the Ray version in the image of the containers
+    ######################headGroupSpecs#################################
+    # Ray head pod template.
+    headGroupSpec:
+      rayStartParams:
+        num-cpus: "0"
+        redis-password: $REDIS_PASSWORD
+      #pod template
+      template:
+        spec:
+          containers:
+            - name: ray-head
+              image: rayproject/ray:2.7.0
+              env:
+                - name: RAY_REDIS_ADDRESS
+                  value: redis:6379
+                # This environment variable is used in the `rayStartParams` above.
+                - name: REDIS_PASSWORD
+                  valueFrom:
+                    secretKeyRef:
+                      name: redis-password-secret
+                      key: password
+              resources:
+                limits:
+                  cpu: 1
+                  memory: 1Gi
+                requests:
+                  cpu: 1
+                  memory: 1Gi
+              ports:
+                - containerPort: 6379
+                  name: gcs-server
+                - containerPort: 8265 # Ray dashboard
+                  name: dashboard
+                - containerPort: 10001
+                  name: client
+                - containerPort: 8000
+                  name: serve
+    workerGroupSpecs:
+      # the pod replicas in this group typed worker
+      - replicas: 2
+        minReplicas: 1
+        maxReplicas: 5
+        # logical group name, for this called small-group, also can be functional
+        groupName: worker
+        # The `rayStartParams` are used to configure the `ray start` command.
+        # See https://github.com/ray-project/kuberay/blob/master/docs/guidance/rayStartParams.md for the default settings of `rayStartParams` in KubeRay.
+        # See https://docs.ray.io/en/latest/cluster/cli.html#ray-start for all available options in `rayStartParams`.
+        rayStartParams: {}
+        #pod template
+        template:
+          spec:
+            containers:
+              - name: ray-worker # must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character (e.g. 'my-name',  or '123-abc'
+                image: rayproject/ray:2.7.0
+                lifecycle:
+                  preStop:
+                    exec:
+                      command: ["/bin/sh","-c","ray stop"]
+                resources:
+                  limits:
+                    cpu: 1
+                    memory: 2Gi
+                  requests:
+                    cpu: 1
+                    memory: 2Gi
+---
+kind: ConfigMap
+apiVersion: v1
+metadata:
+  name: query-config
+data:
+  query.py: |-
+    import requests
+
+    url = "http://rayservice-ha-serve-svc:8000/fruit/"
+    data = '["PEAR", 12]'
+
+    req_index = 0
+    num_fail = 0
+
+    while True:
+        print(f"req_index : {req_index}, num_fail: {num_fail}")
+        try:
+            response = requests.post(url, data=data)
+            print(f"response: {response.text}")
+        except Exception as e:
+            print(e)
+            num_fail += 1
+        req_index += 1
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  name: ray-pod
+spec:
+  containers:
+  - name: ray-container
+    image: rayproject/ray:2.7.0
+    command: ["/bin/bash", "-c", "--"]
+    args: ["while true; do sleep 30; done;"]
+    volumeMounts:
+      - mountPath: /home/ray/samples
+        name: query-configmap
+  volumes:
+    - name: query-configmap
+      configMap:
+        name: query-config
+        items:
+          - key: query.py
+            path: query.py