roll update

controllers/rolling-update.md

@@ -0,0 +1,68 @@
+## Step1: Deploy Version 1
+
+```
+## Create a deployment with a record (for rollbacks):
+
+	kubectl create -f deployment-ex3.yml --record
+
+## Check the status of the rollout:
+
+	kubectl rollout status deployments kubeserve
+
+## validate deployment & Service 
+
+	kubectl get deploy kubeserve -o wide 
+	kubectl get pods -o wide 
+	kubectl get svc kubeserve-svc -o wide 
+	kubectl get ep kubeserve-svc 
+```
+
+## Step2: edit the deployment yml file & Update the version 'v2' to perform rolling update
+
+```
+## before we apply v2, lets access the application & check the output
+
+	kubectl get svc kubeserve-svc   ## copy service IP
+
+	Run this curl look while the update happens:
+
+		while true; do curl http://serviceIP; done    # Run this on Node -- DO NOT ON MASTER
+
+## Use kubectl apply to update a deployment:
+
+	kubectl apply -f deployment-ex3.yml --record
+	  
+## validate: deployment to see the updated image
+
+	kubectl roullout status deploy kubeserve
+	kubectl get deploy kubeserve -o wide 
+      
+```
+
+## Step3: Now, edit the version of image back to ‘v1’ in yml file & apply
+
+```
+   kubectl apply -f kubeserve-deployment.yaml --record
+   
+   cotinue to watch the application output node 
+```
+
+
+## Step4: Apply the rolling update to version 3 (buggy)
+
+```
+kubectl set image deployment kubeserve app=leaddevops/kubeserve:v3
+
+continue to watch the output of application throwing errors with buggy app
+
+undo the deployment 
+	kubectl rollout undo deployment kubeserve
+	
+
+To Roll back to a certain revision:	
+
+check the rollout history to go back to version 
+
+	kubectl rollout history deployment kubeserve
+	kubectl rollout undo deployment kubeserve --to-revision=2
+```

exam-prep/README.md

@@ -53,7 +53,7 @@ kubectl create service nodeport nginx --tcp=80:80 --node-port=30080 --dry-run -o
 kubectl create service clusterip nginx --tcp=80:80 --dry-run -o yaml ## generate a service yaml with type: ClusterIP
 ```
 
-## `Generate Service yaml for run pods/deployment`
+## `Generate Service yaml for to expose/access running pods/deployment`
 
 ```
 ## Note: to use below commands, the pod/deployment must be created first