Create a deployment called webapp with image nginx having 5 replicas in it, put the file in /tmp directory with named webapp.yaml

• A.//Create a file using dry run command
  kubectl create deploy --image=nginx --dry-run -o yaml >
  /tmp/webapp.yaml
  // Now, edit file webapp.yaml and update replicas=5
  apiVersion: apps/v1
  kind: Deployment
  metadata:
  labels:
  app: webapp
  name: webapp
  spec:
  replicas: 5
  selector:
  matchLabels:
  app: webapp
  template:
  metadata:
  labels:
  Note: Search "deployment" in kubernetes.io site , you will get
  the page
  https://kubernetes.io/docs/concepts/workloads/controllers/deplo
  yment/
  // Verify the Deployment
  kubectl get deploy webapp --show-labels
  // Output the YAML file of the deployment webapp
  kubectl get deploy webapp -o yaml
• B.//Create a file using dry run command
  kubectl create deploy --image=nginx --dry-run -o yaml >
  /tmp/webapp.yaml
  // Now, edit file webapp.yaml and update replicas=5
  apiVersion: apps/v1
  kind: Deployment
  metadata:
  labels:
  app: webapp
  name: webapp
  spec:
  replicas: 5
  selector:
  matchLabels:
  app: webapp
  template:
  metadata:
  labels:
  app: webapp
  spec:
  containers:
  - image: nginx
  name: nginx
  Note: Search "deployment" in kubernetes.io site , you will get
  the page
  https://kubernetes.io/docs/concepts/workloads/controllers/deplo
  yment/
  // Verify the Deployment
  kubectl get deploy webapp --show-labels
  // Output the YAML file of the deployment webapp
  kubectl get deploy webapp -o yaml

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Create an nginx pod with containerPort 80 and with a PersistentVolumeClaim "task-pv-claim" and has a mouth path "/usr/share/nginx/html"

• A.vim nginx-pvc-pod.yaml
  apiVersion: v1
  kind: Pod
  metadata:
  name: task-pv-pod
  spec:
  volumes:
  - name: task-pv-storage
  persistentVolumeClaim:
  claimName: task-pv-claim
  containers:
  - name: task-pv-container
  image: nginx
  ports:
  - containerPort: 80
  name: "http"
  volumeMounts:
  - mountPath: "/usr/share/nginx/html"
  name: task-pv-storage
  kubectl apply -f nginx-pvc-pod.yaml
  // Verify
  kubectl describe po "POD-Name" | grep -i volumes -A5
  Volumes:
  task-pv-storage:
  Type: PersistentVolumeClaim (a reference to a
  PersistentVolumeClaim in the same namespace)
  ClaimName: task-pv-claim
  ReadOnly: false
• B.vim nginx-pvc-pod.yaml
  apiVersion: v1
  kind: Pod
  metadata:
  name: task-pv-pod
  spec:
  volumes:
  - name: task-pv-storage
  persistentVolumeClaim:
  claimName: task-pv-claim
  containers:
  - name: task-pv-container
  image: nginx
  ports:
  - containerPort: 60
  name: "http"
  volumeMounts:
  - mountPath: "/usr/share/nginx/html"
  name: task-pv-storage
  kubectl apply -f nginx-pvc-pod.yaml
  // Verify
  kubectl describe po "POD-Name" | grep -i volumes -A4
  Volumes:
  task-pv-storage:
  Type: PersistentVolumeClaim (a reference to a
  PersistentVolumeClaim in the same namespace)
  ClaimName: task-pv-claim
  ReadOnly: false

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Ensure a single instance of pod nginx is running on each node of the Kubernetes cluster where nginx also represents the Image name which has to be used. Do not override any taints currently in place.
Use DaemonSet to complete this task and use ds-kusc00201 as DaemonSet name.

Correct Answer:

See the solution below.
Explanation
solution

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Undo the deployment with the previous version and verify
everything is Ok

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Get the memory and CPU usage of all the pods and find out top 3 pods which have the highest usage and put them into the cpuusage.txt file

• A.// Get the top 3 pods
  kubectl top pod --all-namespaces | sort --reverse --key 3 --
  numeric | head -8
  // putting into file
  kubectl top pod --all-namespaces | sort --reverse --key 6 --
  numeric | head -6 > cpu-usage.txt
  // verify
  cat cpu-usage.txt
• B.// Get the top 3 pods
  kubectl top pod --all-namespaces | sort --reverse --key 3 --
  numeric | head -3
  // putting into file
  kubectl top pod --all-namespaces | sort --reverse --key 3 --
  numeric | head -3 > cpu-usage.txt
  // verify
  cat cpu-usage.txt

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