feat(cassandra-chart): Adding cassandra pod-delete chart (#209)

Signed-off-by: shubhamchaudhary <shubham.chaudhary@mayadata.io>

charts/cassandra/cassandra-pod-delete/cassandra-pod-delete.chartserviceversion.yaml

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+apiVersion: litmuchaos.io/v1alpha1
+kind: ChartServiceVersion
+metadata:
+  createdAt: 2020-04-14T10:28:08Z
+  name: cassandra-pod-delete
+  version: 0.1.0
+  annotations:
+    categories: Cassandra
+    vendor: CNCF
+    support: https://slack.kubernetes.io/
+spec:
+  displayName: cassandra-pod-delete
+  categoryDescription: |
+    This experiment causes (forced/graceful) pod failure of random replicas of an cassandra statefulset. 
+    It tests statefulset sanity (replica availability & uninterrupted service) and recovery workflows of the cassandra pod
+  keywords:
+    - Kubernetes
+    - Cassandra
+    - Pod
+  platforms:
+    - GKE
+    - Konvoy
+    - Packet(Kubeadm)
+    - Minikube
+    - EKS
+  maturity: alpha
+  maintainers:
+    - name: Shubham Chaudhary
+      email: shubham.chaudhary@mayadata.io
+  minKubeVersion: 1.12.0
+  provider:
+    name: Mayadata
+  links:
+    - name: Source Code
+      url: https://github.com/litmuschaos/litmus/tree/master/experiments/cassandra/cassandra-pod_delete
+    - name: Documentation
+      url: https://docs.litmuschaos.io/docs/cassandra-pod-delete/
+    - name: Video
+      url: 
+  icon:
+    - url: 
+      mediatype: ""
+  chaosexpcrdlink: https://raw.githubusercontent.com/litmuschaos/chaos-charts/master/charts/cassandra/cassandra-pod-delete/experiment.yaml

charts/cassandra/cassandra-pod-delete/engine.yaml

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+apiVersion: litmuschaos.io/v1alpha1
+kind: ChaosEngine
+metadata:
+  name: cassandra-chaos
+  namespace: default
+spec:
+  appinfo:
+    appns: 'default'
+    applabel: 'app=cassandra'
+    appkind: 'statefulset'
+  # It can be true/false
+  annotationCheck: 'true'
+  # It can be active/stop
+  engineState: 'active'
+  #ex. values: ns1:name=percona,ns2:run=nginx
+  auxiliaryAppInfo: ''
+  chaosServiceAccount: cassandra-pod-delete-sa
+  monitoring: false
+  # It can be delete/retain
+  jobCleanUpPolicy: 'delete'
+  experiments:
+    - name: cassandra-pod-delete
+      spec:
+        components:
+          env:
+            # set chaos duration (in sec) as desired
+            - name: TOTAL_CHAOS_DURATION
+              value: '15'
+
+            # set chaos interval (in sec) as desired
+            - name: CHAOS_INTERVAL
+              value: '15'
+              
+            # pod failures without '--force' & default terminationGracePeriodSeconds
+            - name: FORCE
+              value: 'false'
+
+            # provide cassandra service name
+            # default service: cassandra
+            - name: CASSANDRA_SVC_NAME
+              value: 'cassandra'
+
+            # provide the keyspace replication factor
+            - name: KEYSPACE_REPLICATION_FACTOR
+              value: '3'
+
+            # provide cassandra port 
+            # default port: 9042
+            - name: CASSANDRA_PORT
+              value: '9042'
+
+            # SET THE CASSANDRA_LIVENESS_CHECK
+            # IT CAN BE `enabled` OR `disabled`
+            - name: CASSANDRA_LIVENESS_CHECK
+              value: ''
+
+            

charts/cassandra/cassandra-pod-delete/experiment.yaml

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+apiVersion: litmuschaos.io/v1alpha1
+description:
+  message: |
+    Deletes a pod belonging to a casandra statefulset
+kind: ChaosExperiment
+metadata:
+  name: cassandra-pod-delete
+  version: 0.1.0
+spec:
+  definition:
+    scope: Namespaced
+    permissions:
+      - apiGroups:
+          - ""
+          - "apps"
+          - "batch"
+          - "litmuschaos.io"
+        resources:
+          - "deployments"
+          - "statefulsets"
+          - "jobs"
+          - "pods"
+          - "pods/log"
+          - "pods/exec"
+          - "services"
+          - "events"
+          - "configmaps"
+          - "chaosengines"
+          - "chaosexperiments"
+          - "chaosresults"
+        verbs:
+          - "create"
+          - "list"
+          - "get"
+          - "patch"
+          - "update"
+          - "delete"
+      - apiGroups:
+          - ""
+        resources: 
+          - "nodes"
+        verbs:
+          - "get"
+          - "list"
+    image: "litmuschaos/ansible-runner:latest"
+    args:
+    - -c
+    - ansible-playbook ./experiments/cassandra/pod-delete/pod_delete_ansible_logic.yml -i /etc/ansible/hosts -vv; exit 0
+    command:
+    - /bin/bash
+    env:
+
+    - name: ANSIBLE_STDOUT_CALLBACK
+      value: 'default'
+
+    # provide cassandra service name
+    # default service: cassandra
+    - name: CASSANDRA_SVC_NAME
+      value: ''
+
+    # provide the keyspace replication factor
+    - name: KEYSPACE_REPLICATION_FACTOR
+      value: ''
+
+    # provide cassandra port 
+    # default port: 9042
+    - name: CASSANDRA_PORT
+      value: ''
+
+    # provide liveness deployement port
+    # default port: 8088, It only supports 8088 port
+    - name: LIVENESS_SVC_PORT
+      value: '8088'
+
+    # provide cassandra liveness image
+    - name: CASSANDRA_LIVENESS_IMAGE
+      value: 'litmuschaos/cassandra-client:latest'
+
+    - name: TOTAL_CHAOS_DURATION
+      value: '15'
+
+    - name: CHAOS_INTERVAL
+      value: '15'
+
+    # SET THE CASSANDRA_LIVENESS_CHECK
+    # IT CAN BE `enabled` OR `disabled`
+    - name: CASSANDRA_LIVENESS_CHECK
+      value: ''
+
+    ## Period to wait before injection of chaos  
+    - name: RAMP_TIME
+      value: ''
+
+    - name: FORCE
+      value: ''
+
+    ## env var that describes the library used to execute the chaos
+    ## default: litmus. Supported values: litmus, powerfulseal
+    - name: LIB
+      value: ''
+
+    labels:
+      name: cassandra-pod-delete

charts/cassandra/cassandra-pod-delete/powerfulseal_rbac.yaml

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+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: cassandra-pod-delete-sa
+  namespace: default
+  labels:
+    name: cassandra-pod-delete-sa
+---
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRole
+metadata:
+  name: cassandra-pod-delete-sa
+  labels:
+    name: cassandra-pod-delete-sa
+rules:
+- apiGroups: ["","litmuschaos.io","batch","apps"]
+  resources: ["pods","deployments","statefulsets","pods/log","pods/exec","services","events","jobs","configmaps","chaosengines","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: cassandra-pod-delete-sa
+  labels:
+    name: cassandra-pod-delete-sa
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: cassandra-pod-delete-sa
+subjects:
+- kind: ServiceAccount
+  name: cassandra-pod-delete-sa
+  namespace: default
+

charts/cassandra/cassandra-pod-delete/rbac.yaml

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+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: cassandra-pod-delete-sa
+  namespace: default
+  labels:
+    name: cassandra-pod-delete-sa
+---
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: Role
+metadata:
+  name: cassandra-pod-delete-sa
+  namespace: default
+  labels:
+    name: cassandra-pod-delete-sa
+rules:
+- apiGroups: ["","litmuschaos.io","batch","apps"]
+  resources: ["pods","deployments","statefulsets","services","pods/log","pods/exec","events","jobs","chaosengines","chaosexperiments","chaosresults"]
+  verbs: ["create","list","get","patch","update","delete"]
+---
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: RoleBinding
+metadata:
+  name: cassandra-pod-delete-sa
+  namespace: default
+  labels:
+    name: cassandra-pod-delete-sa
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: cassandra-pod-delete-sa
+subjects:
+- kind: ServiceAccount
+  name: cassandra-pod-delete-sa
+  namespace: default
+