Kubernetes Tutorial

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Cluster Control

kubectl get nodes
kubectl get pods
kubectl get deployments
kubectl get services

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Create Deployment

kubectl create -f ./echo-deployment.yaml
kubectl create -f ./nginx-deployment.yaml

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Create Service

kubectl create -f ./echo-service.yaml
kubectl create -f ./nginx-service.yaml

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Create ConfigMap

kubectl create -f ./nginx-config.yaml

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Deployment Control

kubectl describe deployment echo-deployment
kubectl describe deployment nginx-deployment

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Restart Pods in Deployment

kubectl rollout restart deployment echo-deployment
kubectl rollout restart deployment nginx-deployment

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Apply Deployment Changes

kubectl apply -f ./echo-deployment.yaml
kubectl apply -f ./nginx-deployment.yaml

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Apply Service Changes

kubectl apply -f ./echo-service.yaml
kubectl apply -f ./nginx-service.yaml

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Apply ConfigMap Changes

kubectl apply -f ./nginx-config.yaml

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Read Pod Logs

kubectl logs <pod>

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Connect to Pod Terminal and Execute Commands

kubectl exec -it <pod> -- /bin/bash

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Scale Manually

kubectl scale deployment echo-deployment --replicas=5
kubectl scale deployment nginx-deployment --replicas=3

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Create HPA via File

kubectl create -f ./echo-hpa.yaml
kubectl create -f ./nginx-hpa.yaml

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Create HPA via Command

kubectl autoscale deployment echo-deployment --cpu-percent=50 --min=2 --max=10
kubectl autoscale deployment nginx-deployment --cpu-percent=15 --min=1 --max=5

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Apply HPA Changes via File

kubectl apply -f ./echo-hpa.yaml
kubectl apply -f ./nginx-hpa.yaml

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Control HPA

kubectl get hpa

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Port Forwarding

kubectl port-forward pod/<nginx-pod> 8080:80

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Check on Browser

http://localhost:8080

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Check on Terminal

# Bash / Linux / macOS
curl http://localhost:8080

# PowerShell / Windows
Invoke-WebRequest http://localhost:8080

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Simulate 10,000 Requests to Increase Load

# Bash / Linux / macOS
for i in {1..10000}; do curl http://localhost:8080; done

# PowerShell / Windows
for ($i=1; $i -le 10000; $i++) { Invoke-WebRequest http://localhost:8080 }

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Control HPA While Watching

kubectl get hpa -w

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Control Pods While Watching

kubectl get pods -w

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Control Events

kubectl get events

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Export Deployment as YAML

kubectl get deployment echo-deployment -o yaml > echo-deployment-export.yaml
kubectl get deployment nginx-deployment -o yaml > nginx-deployment-export.yaml

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Export Service as YAML

kubectl get svc echo-service -o yaml > echo-service-export.yaml
kubectl get svc nginx-service -o yaml > nginx-service-export.yaml

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Export ConfigMap as YAML

kubectl get configmap nginx-config -o yaml > nginx-config-export.yaml

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Export HPA as YAML

kubectl get hpa echo-deployment -o yaml > echo-hpa-export.yaml
kubectl get hpa nginx-deployment -o yaml > nginx-hpa-export.yaml

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Delete HPA

kubectl delete -f ./echo-hpa.yaml
kubectl delete -f ./nginx-hpa.yaml

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Delete Service

kubectl delete -f ./echo-service.yaml
kubectl delete -f ./nginx-service.yaml

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Delete ConfigMap

kubectl delete -f ./nginx-config.yaml

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Delete Deployment

kubectl delete -f ./echo-deployment.yaml
kubectl delete -f ./nginx-deployment.yaml