Запускаем приложение с использованием NginxInc Kubernetes Ingress

Делаю
04.04.2019

По материалам из видео индуса:

https://www.youtube.com/watch?v=YzaYqxW0wGs&list=PL34sAs7_26wNBRWM6BDhnonoA5FMERax0

kubernetes ingress

Подготовили кластер и окружение как здесь.

Установили и настроили HAProxy как здесь.

Создаем NginxInc Kubernetes Ingress контроллер

Запускаем приложение

$ kubectl create -f https://raw.githubusercontent.com/justmeandopensource/kubernetes/master/yamls/ingress-demo/nginx-deploy-blue.yaml

$ kubectl create -f https://raw.githubusercontent.com/justmeandopensource/kubernetes/master/yamls/ingress-demo/nginx-deploy-green.yaml

$ kubectl create -f https://raw.githubusercontent.com/justmeandopensource/kubernetes/master/yamls/ingress-demo/ingress-resource-2.yaml

$ kubectl expose deploy nginx-deploy-blue --port 80

$ kubectl expose deploy nginx-deploy-green --port 80

$ kubectl describe ing ingress-resource-2

$ kubectl get pods
NAME                                 READY   STATUS    RESTARTS   AGE
nginx-deploy-blue-7cc7d854dc-9hzwf   1/1     Running   0          3m5s
nginx-deploy-green-fbbd6d8d8-2nkzb   1/1     Running   0          3m

Настройка на клиенте

# vi /etc/hosts

192.168.0.5 blue.nginx.example.com
192.168.0.5 green.nginx.example.com

$ curl blue.nginx.example.com
<h1>I am <font color=blue>BLUE</font></h1>

$ curl green.nginx.example.com
<h1>I am <font color=green>GREEN</font></h1>

Удаляем все это добро:

$ kubectl delete ing ingress-resource-2

$ kubectl delete deployment nginx-deploy-blue
$ kubectl delete deployment nginx-deploy-green

$ kubectl delete service nginx-deploy-blue
$ kubectl delete service nginx-deploy-green

Попробуем запустить свое приложение:

$ mkdir ~/tmp/cats-app/ && cd ~/tmp/cats-app/

# vi nodejs-cats-app-deployment.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nodejs-cats-app-deployment
spec:
  replicas: 3
  template:
    metadata:
      labels:
        app: nodejs-cats-app
    spec:
      containers:
      - name: nodejs-cats-app
        image: webmakaka/cats-app

$ vi nodejs-cats-app-svc-nodeport.yaml

apiVersion: v1
kind: Service
metadata:
  name: nodejs-cats-app-nodeport
spec:
  type: NodePort
  ports:
  - port: 80
    targetPort: 8080
    nodePort: 30123
  selector:
    app: nodejs-cats-app

# vi ingress-resource-nodejs-cats-app.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nodejs-cats-app-ingress
spec:
  rules:
  - host: nodejs-cats-app.example.com
    http:
      paths:
      - path: /
        backend:
          serviceName: nodejs-cats-app-nodeport
          servicePort: 80

$ kubectl create -f nodejs-cats-app-deployment.yaml
$ kubectl create -f nodejs-cats-app-svc-nodeport.yaml
$ kubectl create -f ingress-resource-nodejs-cats-app.yaml

$ kubectl get pods
NAME                                          READY   STATUS    RESTARTS   AGE
nodejs-cats-app-deployment-5d67fbc67d-2bmxz   1/1     Running   0          44m
nodejs-cats-app-deployment-5d67fbc67d-4jkz2   1/1     Running   0          34m
nodejs-cats-app-deployment-5d67fbc67d-ghtc5   1/1     Running   0          44m

$ kubectl get deployments
NAME                         READY   UP-TO-DATE   AVAILABLE   AGE
nodejs-cats-app-deployment   3/3     3            3           48m

$ kubectl get ing
NAME                      HOSTS                         ADDRESS   PORTS   AGE
nodejs-cats-app-ingress   nodejs-cats-app.example.com             80      48m

$ kubectl get service
NAME                       TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE
kubernetes                 ClusterIP   10.96.0.1        <none>        443/TCP        66m
nodejs-cats-app-nodeport   NodePort    10.110.183.157   <none>        80:30123/TCP   49m

На клиенте:

# vi /etc/hosts

192.168.0.5 nodejs-cats-app.example.com

$ curl nodejs-cats-app.example.com
OK

Удалить

# kubectl delete deployment nodejs-cats-app-deployment
# kubectl delete ing nodejs-cats-app-ingress
# kubectl delete service nodejs-cats-app-deployment
# kubectl delete svc nodejs-cats-app-nodeport