Ingress of K8S

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Reference video : https://ke.qq.com/user/index/index.html#/plan/cid=1709963&term_id=102815140

1. Concept

1.1.NodePort存在的不足

A port can only be associated with one service, and the port needs to be planned in advance.
Only supports 4-layer load balancing (NodeIP+Port)

1.2.Ingress

Associated Service
realizes Pod load balancing through Ingress Controller,
supports TCP/UDP layer 4 and HTTP layer 7

2. Deploy Ingress Controller (global load balancing)

2.1.下载yaml文件

Address: https://github.com/kubernetes/ingress-nginx/tree/nginx-0.30.0

2.2.下载镜像

docker pull siriuszg/nginx-ingress-controller:0.30.0

2.3修改mandatory.yaml

Use the host network
mirror to modify the mirror image downloaded in the previous step

kubectl apply -f mandatory.yaml

It will monitor port 80 and 443 of the host normally

Three, HTTP-based Ingress rules

3.1.yaml文件

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: ingress
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - host: foo.bar.com
    http:
      paths:
      - backend:
          serviceName: web
          servicePort: 80

Explanation

host: foo.bar.com			#访问Ingress的域名
serviceName: web			#管理服务名为web的Service
servicePort: 80				#Service监听的端口为80,通过kubectl get svc查看

kubectl apply -f ingress.yaml
kubectl get ing

3.2.访问域名

Check which node nginx-ingress-controller is deployed to

kubectl get pod -o wide -ningress-nginx

nginx-ingress-controller is deployed to the 192.168.1.10 node.

Since foo.bar.com is temporary, it is necessary to write the domain name resolution to the hosts file

echo "192.168.1.10 foo.bar.com" >> /etc/hosts
curl foo.bar.com

Four, Ingress rules based on HTTPS

4.1.生成自签证书

openssl genrsa > cert.key
openssl req -new -x509 -key cert.key -subj "/CN=common" >cert.pe

4.2.创建secret

kubectl create secret tls foo-bar-com --cert=cert.pem --key=cert.key
kubectl get secrets

4.3.Ingress规则

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: tls-example-ingress
spec:
  tls:
  - hosts:
    - foo.bar.com
    secretName: foo-bar-com
  rules:
    - host: foo.bar.com
      http:
        paths:
        - path: /
          backend:
            serviceName: web
            servicePort: 80

kubectl apply -f ingress-https.yaml