chore(new_chart): Add Chaos Charts for pod autoscaler experiment (#286)

* Add pod autoscaler charts

Signed-off-by: Udit Gaurav <udit.gaurav@mayadata.io>

charts/generic/generic.chartserviceversion.yaml

@@ -29,6 +29,7 @@ spec:
     - pod-network-duplication
     - node-taint
     - docker-service-kill
+    - pod-autoscaler
     
   keywords:
     - Kubernetes

charts/generic/generic.package.yaml

@@ -48,3 +48,6 @@ experiments:
   - name: docker-service-kill
     CSV: docker-service-kill.chartserviceversion.yaml
     desc: "docker-service-kill"
+  - name: pod-autoscaler
+    CSV: pod-autoscaler.chartserviceversion.yaml
+    desc: "pod-autoscaler"

charts/generic/pod-autoscaler/engine.yaml

@@ -0,0 +1,33 @@
+apiVersion: litmuschaos.io/v1alpha1
+kind: ChaosEngine
+metadata:
+  name: nginx-chaos
+  namespace: default
+spec:
+  # It can be true/false
+  annotationCheck: 'false'
+  # It can be active/stop
+  engineState: 'active'
+  #ex. values: ns1:name=percona,ns2:run=nginx 
+  auxiliaryAppInfo: ''
+  appinfo:
+    appns: 'default'
+    applabel: 'app=nginx'
+    appkind: 'deployment'
+  chaosServiceAccount: pod-autoscaler-sa
+  monitoring: false
+  # It can be delete/retain
+  jobCleanUpPolicy: 'delete'
+  experiments:
+    - name: pod-autoscaler
+      spec:
+        components:
+          env:
+            # set chaos duration (in sec) as desired
+            - name: TOTAL_CHAOS_DURATION
+              value: '60'
+
+            # number of replicas to scale
+            - name: REPLICA_COUNT
+              value: '5'
+              

charts/generic/pod-autoscaler/experiment.yaml

@@ -0,0 +1,67 @@
+apiVersion: litmuschaos.io/v1alpha1
+description:
+  message: |
+    Scale the application replicas and test the node autoscaling on cluster
+kind: ChaosExperiment
+metadata:
+  name: pod-autoscaler
+  version: 0.1.0
+spec:
+  definition:
+    scope: Cluster
+    permissions:
+      - apiGroups:
+          - ""
+          - "batch"
+          - "apps"
+          - "litmuschaos.io"
+        resources:
+          - "jobs"
+          - "pods"
+          - "pods/log"
+          - "deployments"
+          - "events"
+          - "chaosengines"
+          - "chaosexperiments"
+          - "chaosresults"
+        verbs:
+          - "create"
+          - "list"
+          - "get"
+          - "patch"
+          - "update"
+          - "delete"
+      - apiGroups:
+          - ""
+        resources: 
+          - "nodes"
+        verbs:
+          - "get"
+          - "list"
+    image: "litmuschaos/go-runner:latest"
+    imagePullPolicy: Always
+    args:
+    - -c
+    - ./experiments/pod-autoscaler
+    command:
+    - /bin/bash
+    env:
+
+    - name: TOTAL_CHAOS_DURATION
+      value: '60'
+
+    # Period to wait before and after injection of chaos in sec
+    - name: RAMP_TIME
+      value: ''
+
+    # Number of replicas to scale
+    - name: REPLICA_COUNT
+      value: '5'
+
+    # PROVIDE THE LIB HERE
+    # ONLY LITMUS SUPPORTED
+    - name: LIB
+      value: 'litmus'
+  
+    labels:
+      name: pod-autoscaler

charts/generic/pod-autoscaler/pod-autoscaler.chartserviceversion.yaml

@@ -0,0 +1,44 @@
+apiVersion: litmuchaos.io/v1alpha1
+kind: ChartServiceVersion
+metadata:
+  createdAt: 2020-08-08T10:28:08Z
+  name: pod-autoscaler
+  version: 0.1.0
+  annotations:
+    categories: Kubernetes
+    vendor: CNCF
+    support: https://slack.kubernetes.io/
+spec:
+  displayName: pod-autoscaler
+  categoryDescription: |
+    The experiment aims to check the ability of nodes to accommodate the number of replicas a given application pod.
+    This experiment can be used for other scenarios as well, such as for checking the Node auto-scaling feature. For example, check if the pods are successfully rescheduled within a specified period in cases where the existing nodes are already running at the specified limits.
+  keywords:
+    - Kubernetes
+    - Scale
+    - State
+    - Node
+    - Replicas
+  platforms:
+    - GKE
+    - EKS
+    - Minikube
+  maturity: alpha
+  chaosType: infra
+  maintainers:
+    - name: Udit Gaurav
+      email: udit.gaurav@mayadata.io
+  minKubeVersion: 1.12.0
+  provider:
+    name: Mayadata
+  links:
+    - name: Source Code
+      url: https://github.com/litmuschaos/litmus-go/tree/master/experiments/generic/pod-autoscaler
+    - name: Documentation
+      url: https://docs.litmuschaos.io/docs/pod-autoscaler/
+    - name: Video
+      url: 
+  icon: 
+    - url: 
+      mediatype: ""
+  chaosexpcrdlink: https://raw.githubusercontent.com/litmuschaos/chaos-charts/master/charts/generic/pod-autoscaler/experiment.yaml

charts/generic/pod-autoscaler/rbac.yaml

@@ -0,0 +1,37 @@
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: pod-autoscaler-sa
+  namespace: default
+  labels:
+    name: pod-autoscaler-sa
+---
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRole
+metadata:
+  name: pod-autoscaler-sa
+  labels:
+    name: pod-autoscaler-sa
+rules:
+- apiGroups: ["","litmuschaos.io","batch","apps"]
+  resources: ["pods","deployments","jobs","events","chaosengines","pods/log","chaosexperiments","chaosresults"]
+  verbs: ["create","list","get","patch","update","delete"]
+- apiGroups: [""]
+  resources: ["nodes"]
+  verbs: ["get","list"]
+---
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRoleBinding
+metadata:
+  name: pod-autoscaler-sa
+  labels:
+    name: pod-autoscaler-sa
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: pod-autoscaler-sa
+subjects:
+- kind: ServiceAccount
+  name: pod-autoscaler-sa
+  namespace: default