02. Create Replication controller

01. Create & Display :

  kubectl create -f nginx-rc.yaml
  kubectl get pods
  kubectl get po -l app=nginx-app
  kubectl get rs nginx-rc -o wide

02. Describe

 kubectl describe rs nginx-rc

03. Update deployment

kubectl set image deploy nginx-deployment nginx-container=nginx:1.9.1
kubectl rollout status deploy/nginx-deployment
kubectl get deploy

06. IF NODE FAIL :

  kubectl get po -o wide
 kubectl get nodes
  kubectl get po -o wide

07. Scaling UP :

  kubectl scale rs nginx-rc --replicas=5
  kubectl get rs nginx-rc
  kubectl get po -o wide

08. Scaling Down :

  kubectl scale rs nginx-rs --replicas=4
  kubectl get rs nginx-rc
  kubectl get po -o wide

07. Delete Replicatoin Controller :

  kubectl delete -f nginx-rc.yaml
  kubectl get rs
  kubectl get po -l app=nginx-app

03. Create k8s Deployment

01. Create & Display :

 kubectl create -f nginx-deployment.yaml
 kubectl get deploy
 kubectl get deploy -l app=nginx-app
 kubectl get rs -l app=nginx-app
 kubectl get po -l app=nginx-app

02. Describe

 kubectl describe deploy nginx-deployment

03. Update deployment

## kubectl set image deploy nginx-deployment nginx-container=nginx:1.9.1
## kubectl rollout status deploy/nginx-deployment
## kubectl get deploy

05. Rollback

 ## kubectl set image deploy nginx-deployment nginx-container=nginx:1.91 --record
 ## kubectl rollout status deploy/nginx-deployment
 ## kubectl rollout history deploy/nginx-deployment
 ## kubectl rollout undo deploy/nginx-deployment
 ## kubectl rollout status deploy/nginx-deployment

06. IF NODE FAIL :

 ## kubectl get po -o wide
 ## kubectl get nodes
 ## kubectl get po -o wide

07. Scaling UP :

 ## kubectl scale deployment nginx-deployment --replicas=5
 ## kubectl get deploy
 ## kubectl get po -o wide

08. Scaling Down :

 ## kubectl scale deployment nginx-deployment --replicas=2
 ## kubectl get deploy
 ## kubectl get po -o wide
 ## kubectl get po -l app=nginx-app

09. Delete Replicatoin Controller :

 ## kubectl delete -f nginx-deployment.yaml
 ## kubectl get rs
 ## kubectl get po -l app=nginx-app

02. Storage Volume

• 02.01. Create EmptyDir volume

     apiVersion: v1
     kind: Pod
     metadata:
       name: test-nginx
     spec:
       containers:
       - image: nginx
         name: test-nginx
         volumeMounts:
         - mountPath: /cache
           name: cache-volume
       volumes:
       - name: cache-volume
         emptyDir: {}
  
  
     ## Create & Display EmptyDir volume
  
     Let's try K8 : kubectl apply -f emptydir.yml
     pod/test-nginx created
  
     Let's try K8 : kubectl get pods
     NAME         READY   STATUS    RESTARTS   AGE
     test-nginx   1/1     Running   0          7s
  
     Let's try K8 : kubectl exec -it test-nginx -- /bin/bash
     root@test-nginx:/# mount | grep -i cache
     /dev/vda1 on /cache type ext4 (rw,relatime)
     
     kubectl describe pod test-nginx
     kubectl delete po test-nginx
  

• 02.02. Create HostPath volume

   kubectl create -f hostpath-test.yaml
   kubectl get po
   kubectl exec redis-hostpath df /test-mnt
   kubectl delete po redis-hostpath

  - ### HostPath - From HOST to Pod : (Node2)
        ```t
        cd /test-vol
         echo "From host" > from-host.txt
         cat from-host.txt
        ```
  - ### Pod (Master)
        ```t
         kubectl exec redis-hostpath cat /test-mnt/from-host.txt
         echo "From host" > from-host.txt
         cat from-host.txt
         kubectl exec redis-hostpath -it -- /bin/sh
         cd /test-mnt
         echo "test host" > from-pod.txt
         cat from-pod.txt
        ```
   - ### HostPath - From HOST to Pod : (Node2)
     ```t
     cd /test-vol
     ls
     cat from-pod.txt
     ```