docs: Improve tutorial (#947)

Co-authored-by: Britania Rodriguez Reyes <[email protected]>

Author: jamyct

docs/tutorials/MigrationWithOverrideDR.md

@@ -15,6 +15,9 @@ Due to a sudden increase in traffic and resource demands in your WestUS clusters
 The following resources are currently deployed in the WestUS clusters:
 
 #### Service
+
+> Note: Service test file located [here](./testfiles/nginx-service.yaml).
+
 ```yaml
 apiVersion: v1
 kind: Service
@@ -36,6 +39,9 @@ Summary:
 - It targets pods with the label app: nginx and forwards traffic to port 80 on the pods.
 
 #### Deployment
+
+> Note: Deployment test file located [here](./testfiles/nginx-deployment.yaml).
+
 ```yaml
 apiVersion: apps/v1
 kind: Deployment
@@ -67,6 +73,9 @@ Summary:
 - The pods are labeled with `app: nginx` and expose port 80.
 
 #### ClusterResourcePlacement
+
+> Note: CRP Availability test file located [here](./testfiles/crp-availability.yaml)
+
 ```yaml
 apiVersion: placement.kubernetes-fleet.io/v1
 kind: ClusterResourcePlacement
@@ -261,6 +270,9 @@ When the clusters in WestUS are nearing capacity limits and risk becoming overlo
 For this tutorial, we will move them to WestEurope.
 
 ## Create Resource Override
+
+> Note: Cluster resource override test file located [here](./testfiles/ro-1.yaml)
+
 To scale up during migration, apply this override before updating crp:
 ```yaml
 apiVersion: placement.kubernetes-fleet.io/v1alpha1
@@ -318,13 +330,13 @@ spec:
   strategy:
     type: RollingUpdate
 ```
-Update the `crp.yaml` to reflect selecting clusters with higher node-count and apply it:
+Update the [`crp-availability.yaml`](./testfiles/crp-availability.yaml) to reflect selecting clusters with higher node-count and apply it:
 ```bash
-kubectl apply -f crp.yaml
+kubectl apply -f crp-availability.yaml
 ```
 
 ### Results
-After applying the updated `crp.yaml`, the Fleet will schedule the application on the available clusters in WestEurope as they each have 3 nodes.
+After applying the updated [`crp-availability.yaml`](./testfiles/crp-availability.yaml), the Fleet will schedule the application on the available clusters in WestEurope as they each have 3 nodes.
 You can check the status of the CRP to ensure that the application has been successfully migrated and is running in the new region:
 ```bash
 kubectl get crp crp-availability -o yaml

docs/tutorials/testfiles/crp-availability.yaml

@@ -0,0 +1,23 @@
+apiVersion: placement.kubernetes-fleet.io/v1
+kind: ClusterResourcePlacement
+metadata:
+  name: crp-availability
+spec:
+  policy:
+    affinity:
+      clusterAffinity:
+        requiredDuringSchedulingIgnoredDuringExecution:
+          clusterSelectorTerms:
+            - labelSelector:
+                matchLabels:
+                  fleet.azure.com/location: westus
+    numberOfClusters: 2
+    placementType: PickN
+  resourceSelectors:
+    - group: ""
+      kind: Namespace
+      name: test-app
+      version: v1
+  revisionHistoryLimit: 10
+  strategy:
+    type: RollingUpdate

docs/tutorials/testfiles/nginx-deployment.yaml

@@ -0,0 +1,20 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  namespace: test-app
+spec:
+  selector:
+    matchLabels:
+      app: nginx
+  replicas: 2
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+        - name: nginx
+          image: nginx:1.16.1
+          ports:
+            - containerPort: 80

docs/tutorials/testfiles/nginx-service.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx-service
+  namespace: test-app
+spec:
+  selector:
+    app: nginx
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 80
+  type: LoadBalancer

docs/tutorials/testfiles/ro-1.yaml

@@ -0,0 +1,23 @@
+apiVersion: placement.kubernetes-fleet.io/v1alpha1
+kind: ResourceOverride
+metadata:
+  name: ro-1
+  namespace: test-app
+spec:
+  resourceSelectors:
+    -  group: apps
+       kind: Deployment
+       version: v1
+       name: nginx-deployment
+  policy:
+    overrideRules:
+      - clusterSelector:
+          clusterSelectorTerms:
+            - labelSelector:
+                matchLabels:
+                  fleet.azure.com/location: westeurope
+        jsonPatchOverrides:
+          - op: replace
+            path: /spec/replicas
+            value:
+              4