Practical.md

Ingress

Helm install

curl https://raw.githubusercontent.com/kubernetes/helm/master/scripts/get > ~/get_helm.sh
chmod 700 ~/get_helm.sh
~/get_helm.sh

Helm init and install nginx-ingress

• https://kubernetes.io/docs/concepts/services-networking/ingress/
• https://github.com/kubernetes/ingress-nginx

kubectl create serviceaccount --namespace kube-system tiller
kubectl create clusterrolebinding tiller-cluster-rule --clusterrole=cluster-admin --serviceaccount=kube-system:tiller
kubectl patch deploy --namespace kube-system tiller-deploy -p '{"spec":{"template":{"spec":{"serviceAccount":"tiller"}}}}'      
helm init --service-account tiller --upgrade

kubectl get nodes -o wide
EXTERNAL_IP=$(kubectl get nodes -o jsonpath='{..addresses[?(@.type=="ExternalIP")].address}')
helm install stable/nginx-ingress --name=nginx-ingress --namespace=kube-system --set rbac.create=true --set controller.service.externalIPs="{$EXTERNAL_IP}"

• Helm release 삭제방법

helm delete --purge nginx-ingress

• kubectl JSONPath support: https://kubernetes.io/docs/reference/kubectl/jsonpath/

Ingress-nginx 생성

kubectl create -f ./k8s/ingress-nginx.yaml

Scaling

Manual scale

kubectl scale --replicas=3 deployment api-gateway
kubectl get pods

Autoscaler

• https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/
• https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough/

kubectl run php-apache --image=k8s.gcr.io/hpa-example --requests=cpu=200m --expose --port=80
kubectl autoscale deployment php-apache --cpu-percent=50 --min=1 --max=10
kubectl get horizontalpodautoscalers

부하 설정

다른 터미널에서,

kubectl run -i --tty load-generator --image=busybox /bin/sh
while true; do wget -q -O- http://php-apache.default.svc.cluster.local; done

상태 확인

kubectl get horizontalpodautoscalers
kubectl get deployment php-apache

자동 확인 (CTRL-C 로 중단)

watch -n 1 "kubectl get horizontalpodautoscalers && kubectl get deployment php-apache && kubectl get pods"