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Last active December 18, 2018 09:05
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Hello World Ingress in Kubernetes
#!/usr/bin/env bash
: '
We'll see...
* Pod replicas
* Helm: The Kubernetes Package Manager
* Ingress resource: Exposes HTTP and HTTPS routes from outside the cluster to services within the cluster.
'
NS_HELLO=hello
NS_INGRESS=ingress
# check nodes
kubectl get nodes
# helm init
kubectl -n kube-system create serviceaccount tiller
kubectl create clusterrolebinding tiller --clusterrole cluster-admin --serviceaccount=kube-system:tiller
helm init --service-account tiller --upgrade
helm repo update
# launch ingress
kubectl create namespace $NS_INGRESS
helm install stable/nginx-ingress --name ingress --namespace $NS_INGRESS
kubectl -n $NS_INGRESS get pod,deploy,rs,svc,ep,ingress -o wide
sleep 10
# launch backend
kubectl create namespace $NS_HELLO
kubectl -n $NS_HELLO create deploy hostnames --image=nginxdemos/hello
kubectl -n $NS_HELLO scale --replicas=3 deploy hostnames
kubectl -n $NS_HELLO create service clusterip hostnames --tcp=8080:80
kubectl -n $NS_HELLO get pod,deploy,rs,svc,ep,ingress -o wide
sleep 10
# add ingress rule for backend
cat << EOF > ingress-hostnames.yaml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
annotations:
kubernetes.io/ingress.class: nginx
name: hello
namespace: $NS_HELLO
spec:
rules:
- host: www.example.com
http:
paths:
- backend:
serviceName: hostnames
servicePort: 8080
path: /hello
EOF
kubectl create -f ingress-hostnames.yaml
# cloud
EXTERNAL_IP=$(kubectl -n ingress get service/ingress-nginx-ingress-controller -o jsonpath='{.status.loadBalancer.ingress.ip}')
EXTERNAL_PORT=80
## inhouse
#EXTERNAL_IP=$(kubectl get nodes -o jsonpath='{.items[1].status.addresses[0].address}')
#EXTERNAL_PORT=$(kubectl -n ingress get service/ingress-nginx-ingress-controller -o jsonpath='{.spec.ports[0].nodePort}')
sudo -- sh -c 'echo "$EXTERNAL_IP www.example.com" >> /etc/hosts'
curl http://www.example.com:$EXTERNAL_PORT/hostnames | grep -i "name:" | awk '{print $2}' | awk '{gsub(/<[^>]*>/,"")};1'
destroy (){
helm delete --purge ingress && kubectl delete ns $NS_INGRESS
kubectl -n $NS_HELLO delete deploy,svc,ingress --all && kubectl delete ns $NS_HELLO
}
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