brief introduction

Just take notes to prevent forgetting. What we want to achieve today is the access method above the article pictures.

k8s installation ingress nginx

First deploy the following yaml file

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/mandatory.yaml

Most of the tutorials are done by typing commands directly, but I like to download them first.

wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/mandatory.yaml

Because it's in China, you need to make sure that the mirror can be downloaded to the machine. If not, I recommend the following method.

https://www.bboysoul.com/2019/08/19/k8s%E5%85%8Dfq%E4%B8%8B%E8%BD%BD%E9%95%9C%E5%83%8F/

Deployment after downloading the mirror

kubectl apply -f mandatory.yaml

It is noteworthy that this yaml file does not contain service. To create a service, use the following yaml file

https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/provider/baremetal/service-nodeport.yaml

Download the yaml file locally and then view the content

apiVersion: v1
kind: Service
metadata:
  name: ingress-nginx
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
  type: NodePort
  ports:
    - name: http
      port: 80
      targetPort: 80
      protocol: TCP
    - name: https
      port: 443
      targetPort: 443
      protocol: TCP
  selector:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

Because we want to achieve the status above the article image, the service also writes a nodePort: 80 and nodePort: 443 fields, such as the following

apiVersion: v1
kind: Service
metadata:
  name: ingress-nginx
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
  type: NodePort
  ports:
    - name: http
      port: 80
      targetPort: 80
      nodePort: 80
      protocol: TCP
    - name: https
      port: 443
      targetPort: 443
      nodePort: 443
      protocol: TCP
  selector:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

Before apply this service, we should pay attention to our apiserver's default node port range is 30000-32767, but the node port we need is not in this range, so we need to modify the node port port port of apiserver.

Because I am a cluster built using kubeadm, so

Edit the following file.

vim /etc/kubernetes/manifests/kube-apiserver.yaml

Added under command

- --service-node-port-range=30-3000

After saving, apiserver will restart automatically and apply configuration. After modifying one node, other master nodes need to be modified to ensure the same configuration of apiserver.

Then apply the yaml file.

Finally, check if the svc is working properly

kubectl get svc -A

If it's normal, let's test it.

Use the following yaml file

#deploy
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-ingress
spec:
  selector:
    matchLabels:
      app: nginx-ingress
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx-ingress
    spec:
      containers:
      - name: nginx-ingress
        image: nginx:1.15
        ports:
        - containerPort: 80
---
#service
apiVersion: v1
kind: Service
metadata:
  name: nginx-ingress
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: nginx-ingress

---
#ingress
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx-ingress
spec:
  rules:
  - host: nginx.bboysoul.com
    http:
      paths:
      - path: /
        backend:
          serviceName: nginx-ingress
          servicePort: 80

There are three objects defined above, one is deployment, one is service, and the last is ingress ingress ress and service binding, so we can access the deployment by visiting nginx.bboysoul.com.

kubectl apply -f ingress-nginx.yaml

Add your k8smaster node and nginx.bboysoul.com parsing to the external dns, and then directly access it.

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