Scale tests added

Author: rcmadhankumar

tests/scale/kube-burner/README.md

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+# Running Scale tests with kube burner
+## Steps
+- [Download](https://github.com/cloud-bulldozer/kube-burner/releases) kube burner binary
+- Untar the tar file
+```
+tar -xvf kube-burner-0.15.1-Linux-ppc64le.tar.gz 
+```
+- Create the storage class 
+```
+kubectl apply -f tests/scale/kube-burner/static/sc.yaml
+```
+- Run workloads
+```
+./kube-burner init --uuid=3fs8d0dgdjknwf49s356g3 -c tests/scale/kube-burner/config.yaml
+```

tests/scale/kube-burner/config.yaml

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+---
+global:
+  writeToFile: true
+  metricsDirectory: collected-metrics
+  measurements:
+    - name: podLatency
+      esIndex: kube-burner
+
+jobs:
+  - name: api-intensive-create
+    jobIterations: 10
+    qps: 10
+    burst: 10
+    jobType: create
+    namespacedIterations: false
+    namespace: kube-system-test
+    podWait: true
+    cleanup: true
+    waitFor: []
+    waitWhenFinished: true
+    objects:
+      - objectTemplate: templates/pvc.yaml
+        replicas: 10
+      - objectTemplate: templates/pod.yaml
+        replicas: 10
+
+  - name: ensure-pods-removal
+    qps: 10
+    burst: 10
+    jobType: delete
+    waitForDeletion: true
+    objects:
+      - kind: Pod
+        labelSelector: {kube-burner-job: api-intensive-create}
+
+  - name: remove-pvc
+    qps: 10
+    burst: 10
+    jobType: delete
+    waitForDeletion: true
+    objects:
+      - kind: PersistentVolumeClaim
+        labelSelector: {kube-burner-job: api-intensive-create}

tests/scale/kube-burner/static/sc.yaml

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+kind: StorageClass
+apiVersion: storage.k8s.io/v1
+metadata:
+  name: powervs-sc
+provisioner: powervs.csi.ibm.com
+volumeBindingMode: WaitForFirstConsumer
+parameters:
+  type: tier3
+  csi.storage.k8s.io/fstype: xfs

tests/scale/kube-burner/templates/pod.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  name: app-{{.Iteration}}-{{.Replica}}
+spec:
+  containers:
+    - name: app-{{.Iteration}}-{{.Replica}}
+      image: k8s.gcr.io/pause:3.6
+      command: ["/pause"]
+      volumeMounts:
+        - name: persistent-storage-{{.Iteration}}-{{.Replica}}
+          mountPath: /data
+  volumes:
+    - name: persistent-storage-{{.Iteration}}-{{.Replica}}
+      persistentVolumeClaim:
+        claimName: powervs-claim-{{.Iteration}}-{{.Replica}}

tests/scale/kube-burner/templates/pvc.yaml

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+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: powervs-claim-{{.Iteration}}-{{.Replica}}
+spec:
+  accessModes:
+    - ReadWriteOnce
+  storageClassName: powervs-sc
+  resources:
+    requests:
+      storage: 1G