Introduction to Kubernetes (k8s) with Node.js.
- Kubernetes (or minikube)
- kubectl
- Docker
- Re-using local Docker daemon with minikube:
eval $(minikube docker-env)(run it once before Docker build) - On OSX: To base64:
pbpaste | base64 | pbcopyand From base64:pbcopy | base64 --decode minikube startandminikube stop
Re-using local Docker daemon with minikube:
eval $(minikube docker-env)Building Docker image:
cd src/gateway
docker build -t my-co/gateway:v1 .kubectl create -f k8s
kubectl get deployment
kubectl get deployment <deployment-name> -o yaml
kubectl edit deployment <deployment-name>
kubectl get secret
kubectl get secret <secret-name> -o yaml
kubectl get service
kubectl get service <service-name> -o yamlkubectl get pod
kubectl describe pod <pod-name>Edit replica number in gateway Deployment and get pods again.
WARNING: Always edit yaml files in Kubernetes via kubectl, it's not synchronized with your local k8s folder.
kubectl get pod
kubectl delete pod <pod-name>
kubectl get podGo to inside a running pod:
kubectl get pod
kubectl exec <pod-name> -it -- sh
nslookup kubernetes gateway
curl <host>:3001
curl <ip>:3001
env | grep GATEWAYFrom minikibe:
minikube service gateway
Do you have a running Heapster (collects metrics for autoscaler)?
kubectl get pod -n kube-systemIf no, install it from here: https://github.com/kubernetes/heapster
kubectl autoscale deployment gateway --cpu-percent=50 --min=1 --max=10
kubectl get hpa
kubectl get hpa gateway -o yaml
ab -n 10000 -c 100 <IP>HPA runs every 2 minutes by default.
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