🌵Ingress
Ingress 和 Ingress Controller
Ingress 可以将集群内的服务对外暴露，并且提供了负载均衡，HTTPS，以及基于域名的分流支持。Ingress 本身是一种配置，配置了如何对外提供服务。
如果需要 Ingress 真正生效，需要依赖于 Ingress Controller。可以简单类比为，Ingress Controller 就像是 Nginx，而 Ingress 则是 Nginx 的配置。
常见的 Ingress Controller 有多种，例如 ingress-nginx，ambassador 等，使用不同的 Ingress Controller 的时候，Ingress 的配置也会有所差别。
这里以 ingress-nginx 为例。
安装 Ingress Controller
bash
$ helm install --name nginx --namespace ingress-nginx stable/nginx-ingress
$ kubectl get all -n ingress-nginx
NAME READY STATUS RESTARTS AGE
pod/nginx-nginx-ingress-controller-7d9449d76c-v4cf9 1/1 Running 0 30s
pod/nginx-nginx-ingress-default-backend-7f79f9545-9px9f 1/1 Running 0 30s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/nginx-nginx-ingress-controller LoadBalancer 10.97.45.251 localhost 80:30432/TCP,443:32760/TCP 30s
service/nginx-nginx-ingress-default-backend ClusterIP 10.108.182.134 <none> 80/TCP 30s
NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/nginx-nginx-ingress-controller 1/1 1 1 30s
deployment.apps/nginx-nginx-ingress-default-backend 1/1 1 1 30s
NAME DESIRED CURRENT READY AGE
replicaset.apps/nginx-nginx-ingress-controller-7d9449d76c 1 1 1 30s
replicaset.apps/nginx-nginx-ingress-default-backend-7f79f9545 1 1 1 30s创建 Ingress
IP 访问
yaml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: nginx
annotations:
kubernetes.io/ingress.class: "nginx"
spec:
rules:
- http:
paths:
- path: /
backend:
serviceName: nginx
servicePort: 80bash
$ kubectl get ingress
NAME HOSTS ADDRESS PORTS AGE
nginx * 80 3s域名分流
yaml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: nginx
annotations:
kubernetes.io/ingress.class: "nginx"
spec:
rules:
- host: nginx-example.com
http:
paths:
- path: /
backend:
serviceName: nginx
servicePort: 80bash
kubectl get ingress
NAME HOSTS ADDRESS PORTS AGE
nginx nginx-example.com 80 10s