Lab Information
There is a production deployment planned for next week. The Nautilus DevOps team wants to test the deployment update and rollback on Dev environment first so that they can identify the risks in advance. Below you can find more details about the plan they want to execute.
Create a namespace devops. Create a deployment called httpd-deploy under this new namespace, It should have one container called httpd, use httpd:2.4.25 image and 3 replicas. The deployment should use RollingUpdate strategy with maxSurge=1, and maxUnavailable=2. Also create a NodePort type service named httpd-service and expose the deployment on nodePort: 30008.
Now upgrade the deployment to version httpd:2.4.43 using a rolling update.
Finally, once all pods are updated undo the recent update and roll back to the previous/original version.
Note:
a. The kubectl utility on jump_host has been configured to work with the kubernetes cluster.
b. Please make sure you only use the specified image(s) for this deployment and as per the sequence mentioned in the task description. If you mistakenly use a wrong image and fix it later, that will also distort the revision history which can eventually fail this task.
Lab Solutions
Step 1: Create the Namespace
First, create the devops namespace:
kubectl create namespace devops
Step 2: Create the Deployment
Create a YAML file for the deployment with the specified configuration:
cat > httpd-deploy.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
name: httpd-deploy
namespace: devops
spec:
replicas: 3
strategy:
type: RollingUpdate
rollingUpdate:
maxSurge: 1
maxUnavailable: 2
selector:
matchLabels:
app: httpd
template:
metadata:
labels:
app: httpd
spec:
containers:
- name: httpd
image: httpd:2.4.25
ports:
- containerPort: 80
EOF
Apply the deployment:
kubectl apply -f httpd-deploy.yaml
Step 3: Create the Service
Create a YAML file for the NodePort service:
cat > httpd-service.yaml << EOF
apiVersion: v1
kind: Service
metadata:
name: httpd-service
namespace: devops
spec:
type: NodePort
selector:
app: httpd
ports:
- protocol: TCP
port: 80
targetPort: 80
nodePort: 30008
EOF
Apply the service:
kubectl apply -f httpd-service.yaml
Step 4: Verify Initial Deployment
Check that everything is running correctly:
kubectl get all -n devops
Step 5: Upgrade the Deployment
Upgrade to the new image version using rolling update:
kubectl set image deployment/httpd-deploy httpd=httpd:2.4.43 -n devops
Monitor the rolling update progress:
kubectl rollout status deployment/httpd-deploy -n devops
Verify the upgrade:
kubectl get pods -n devops -o wide
kubectl describe deployment httpd-deploy -n devops
Step 6: Rollback to Previous Version
Undo the recent update and roll back to the original version:
kubectl rollout undo deployment/httpd-deploy -n devops
Monitor the rollback progress:
kubectl rollout status deployment/httpd-deploy -n devops
Step 7: Final Verification
Verify that the rollback was successful:
kubectl get pods -n devops -o wide
kubectl describe deployment httpd-deploy -n devops
Check the rollout history:
kubectl rollout history deployment/httpd-deploy -n devops
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