K8S-LABS

K8S LAB 2

1-Create a ReplicaSet using the below yaml

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: new-replica-set
  namespace: default
spec:
  replicas: 4
  selector:
    matchLabels:
      name: busybox-pod
  template:
    metadata:
      labels:
        name: busybox-pod
    spec:
      containers:
      - command:
        - sh
        - -c
        - echo Hello Kubernetes! && sleep 3600
        image: busybox777
        imagePullPolicy: Always
        name: busybox-container

#Create a YAML file then apply it
vim deployment-1.yml
kubectl apply -f deployment-1.yml

2-How many PODs are DESIRED in the new-replica-set?

kubectl get replicaset.apps

3-What is the image used to create the pods in the new-replica-set?

the image is busybox777

kubectl describe replicaset.apps

4-How many PODs are READY in the new-replica-set?

kubectl get replicaset.apps

5-Why do you think the PODs are not ready?

I think the PODS are not ready due to an error in fetching the image from container registery which is DockerHub (no such image called busybox777)

kubectl describe replicaset.apps #OR
kubectl get pods

6-Delete any one of the 4 PODs.

How many pods now

still 4 pods due to specified desired number of pods

kubectl delete po new-replica-set-69bsf

7-Why are there still 4 PODs, even after you deleted one?

Because of the controller on master node checks the worker node for the specified desired number of pods in the YAML file of deployment if there's any pod down for any reason it automatically creates another one

8-Create a ReplicaSet using the below yaml

There is an issue with the file, so try to fix it.

apiVersion: v1
kind: ReplicaSet
metadata:
  name: replicaset-1
spec:
  replicas: 2
  selector:
    matchLabels:
      tier: frontend
  template:
    metadata:
      labels:
        tier: frontend
    spec:
      containers:
      - name: nginx
        image: nginx

The issue in the YAML file is the apiVersion the apiVersion of Replica sets is apps/v1

the right answer is

apiVersion: apps/v1

Edited the file and applied it, now the Deployment is running

K8S LAB 3

1-Create a deployment called my-first-deployment of image nginx:alpine in the default namespace.

Check to make sure the deployment is healthy.

kubectl create deployment my-first-deployment --image=nginx:alpine --dry-run=client -oyaml > dep1.yml
kubectl apply -f dep1.yml

2-Scale my-first-deployment up to run 3 replicas. Check to make sure all 3 replicas are ready.

kubectl scale deployment my-first-deployment --replicas=3
#OR best practice is modify the Yaml file itself to make replicas 3

3-Scale my-first-deployment down to run 2 replicas.

kubectl scale deployment my-first-deployment --replicas=2
#OR best practice is modify the Yaml file itself to make replicas 2

4-Change the image my-first-deployment runs from nginx:alpine to httpd:alpine .

vim dep1.yml 
#change the image
kubectl apply -f dep1.yml

5-Delete the deployment my-first-deployment

kubectl delete deployment my-first-deployment

6-Create deployment from the below yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: frontend-deployment
  namespace: default
spec:
  replicas: 4
  selector:
    matchLabels:
      name: busybox-pod
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      labels:
        name: busybox-pod
    spec:
      containers:
      - command:
        - sh
        - -c
        - echo Hello Kubernetes! && sleep 3600
        image: busybox888
        imagePullPolicy: Always
        name: busybox-container

vim dep2.yml
kubectl apply -f dep2.yml

7-How many ReplicaSets exist on the system now?

kubectl get deployment

6 total replica sets

8-How many PODs exist on the system now?

kubectl get pods

6 pods

9-Out of all the existing PODs, how many are ready?

2 pods Are ready

10-What is the image used to create the pods in the new deployment?

kubectl describe deployment

busybox888 image

11-Why do you think the deployment is not ready?

Error pulling the image from docker hub, No such image.

12-Create a new Deployment using the below yaml

No YAML file was provided

13- There is an issue with the file, so try to fix it and correct the value of kind.

The issue is there is no Yaml file included :'D

LAB 4

1-How many Services exist on the system?

kubectl get svc

2-What is the type of the default kubernetes service?

The Default type is ClusterIP

3-What is the targetPort configured on the kubernetes service?

kubectl describe svc

target port is 6443/TCP

4-How many labels are configured on the kubernetes service?

Labels:            component=apiserver
                   provider=kubernetes

5-How many Endpoints are attached on the kubernetes service?

1 Endpoint = 172.30.1.2:6443

6-Create a Deployment using the below yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: simple-webapp-deployment
  namespace: default
spec:
  replicas: 4
  selector:
    matchLabels:
      name: simple-webapp
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      creationTimestamp: null
      labels:
        name: simple-webapp
    spec:
      containers:
      - image: kodekloud/simple-webapp:red
        imagePullPolicy: IfNotPresent
        name: simple-webapp
        ports:
        - containerPort: 8080
          protocol: TCP

vim deployment.yml
kubectl apply -f deployment.yml

7-What is the image used to create the pods in the deployment?

kubectl describe deployment

kodekloud/simple-webapp:red

8-Create a new service to access the web application using the the below

Name: webapp-service
Type: NodePort
targetPort: 8080
port: 8080
nodePort: 30080

The syntax of this Yaml file is wrong and it's missing key components

The updated version :

vim scv.yml
kubectl apply -f scv.yml

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