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STACKSIMPLIFY Kubernetes Rollback Deployments on AWS EKS

stacksimplify/aws-eks-kubernetes-masterclass

Rollback Deployment ¶

Step-00: Introduction ¶

We can rollback a deployment in two ways.
Previous Version
Specific Version

Step-01: Rollback a Deployment to previous version ¶

Check the Rollout History of a Deployment ¶

# List Deployment Rollout History
kubectl rollout history deployment/<Deployment-Name>
kubectl rollout history deployment/my-first-deployment

Verify changes in each revision ¶

Observation: Review the "Annotations" and "Image" tags for clear understanding about changes.

# List Deployment History with revision information
kubectl rollout history deployment/my-first-deployment --revision=1
kubectl rollout history deployment/my-first-deployment --revision=2
kubectl rollout history deployment/my-first-deployment --revision=3

Rollback to previous version ¶

Observation: If we rollback, it will go back to revision-2 and its number increases to revision-4

# Undo Deployment
kubectl rollout undo deployment/my-first-deployment

# List Deployment Rollout History
kubectl rollout history deployment/my-first-deployment

Verify Deployment, Pods, ReplicaSets ¶

kubectl get deploy
kubectl get rs
kubectl get po
kubectl describe deploy my-first-deployment

Access the Application using Public IP ¶

We should see Application Version:V2 whenever we access the application in browser

# Get NodePort
kubectl get svc
Observation: Make a note of port which starts with 3 (Example: 80:3xxxx/TCP). Capture the port 3xxxx and use it in application URL below. 

# Get Public IP of Worker Nodes
kubectl get nodes -o wide
Observation: Make a note of "EXTERNAL-IP" if your Kubernetes cluster is setup on AWS EKS.

# Application URL
http://<worker-node-public-ip>:<Node-Port>

Step-02: Rollback to specific revision ¶

Check the Rollout History of a Deployment ¶

# List Deployment Rollout History
kubectl rollout history deployment/<Deployment-Name>
kubectl rollout history deployment/my-first-deployment

Rollback to specific revision ¶

# Rollback Deployment to Specific Revision
kubectl rollout undo deployment/my-first-deployment --to-revision=3

List Deployment History ¶

Observation: If we rollback to revision 3, it will go back to revision-3 and its number increases to revision-5 in rollout history
```
# List Deployment Rollout History
kubectl rollout history deployment/my-first-deployment  
```

Access the Application using Public IP ¶

We should see Application Version:V3 whenever we access the application in browser

# Get NodePort
kubectl get svc
Observation: Make a note of port which starts with 3 (Example: 80:3xxxx/TCP). Capture the port 3xxxx and use it in application URL below. 

# Get Public IP of Worker Nodes
kubectl get nodes -o wide
Observation: Make a note of "EXTERNAL-IP" if your Kubernetes cluster is setup on AWS EKS.

# Application URL
http://<worker-node-public-ip>:<Node-Port>

AWS EKS - Elastic Kubernetes Service - Masterclass ¶

Step-03: Rolling Restarts of Application ¶

Rolling restarts will kill the existing pods and recreate new pods in a rolling fashion.

# Rolling Restarts
kubectl rollout restart deployment/<Deployment-Name>
kubectl rollout restart deployment/my-first-deployment

# Get list of Pods
kubectl get po