Kubernetes 上的 Docker nginx 反向代理

Question

I have a couple of applications, which runs in Docker containers (all on the same VM). In front of them, I have an nginx container as a reverse proxy. Now I want to migrate that to Kubernetes.

When I start them by docker-composer locally it works like expected. On Kubernetes not.

nginx.conf

http {
        server {
                location / {
                        proxy_pass http://app0:80;
                }

                location /app1/ {
                        proxy_pass http://app1:80;
                        rewrite ^/app1(.*)$ $1 break;
                }

                location /app2/ {
                        proxy_pass http://app2:80;
                        rewrite ^/app2(.*)$ $1 break;
                }
        }
}

edit: nginx.conf is not used on kubernetes. I have to use ingress-controller for that:

deployment.yaml

 apiVersion: apps/v1beta1 kind: Deployment metadata: name: app0 spec: replicas: 1 template: metadata: labels: app: app0 spec: nodeSelector: "beta.kubernetes.io/os": linux containers: - name: app0 image: appscontainerregistry1.azurecr.io/app0:latest imagePullPolicy: Always ports: - containerPort: 80 name: nginx --- #the other apps --- apiVersion: extensions/v1beta1 kind: Ingress metadata: name: ingress-nginx annotations: # use the shared ingress-nginx kubernetes.io/ingress.class: "nginx" spec: rules: - host: apps-url.com http: paths: - path: / backend: serviceName: app0 servicePort: 80 - path: /app1 backend: serviceName: app1 servicePort: 80 - path: /app2 backend: serviceName: app2 servicePort: 80 --- apiVersion: v1 kind: Service metadata: name: loadbalancer spec: type: LoadBalancer ports: - port: 80 selector: app: ingress-nginx

I get the response on / (app0). Unfortunately, the subroutes are not working. What I´m doing wrong?

EDIT

I figured out. Ich missed installing the ingress controller. Like on this page ( https://kubernetes.io/docs/concepts/services-networking/ingress/ ) described, the ingress doesn't work if no controller is installed. I used ingress-nginx as a controller ( https://kubernetes.github.io/ingress-nginx/deploy/ ) because it was the best-described install guide which I was able to find and I didn´t want to use HELM. I have one more question. How I can change my ingress that subdomains are working. For example, k8url.com/app1/subroute shows me every time the start page of my app1. And if I use a domain name proxying, it rewrites every time the domain name by the IP.

Answer 1

you have created deployment successfully but with that service should be there. nginx ngress on kubernetes manage traffic based on the service.

so flow goes like

nginx-ingress > service > deployment pod.

you are missing to create the service for both applications and add the proper route based on that in kubernetes ingress.

Answer 2

Add this :

apiVersion: v1
kind: Service
metadata:
  name: loadbalancer
spec:
  type: LoadBalancer
  ports:
  - port: 80
    targetPort: 80
  selector:
    app: ingress-nginx

Because you didnot route for Service Load balancer to targetPort to 80