Kubernetes 之 Ingress
定义
Ingress 可以把外部需要进入到集群内部的请求转发到集群中的一些服务上，从而实现把服务映射到集群外部的需要。Ingress 能把集群内 Service 配置成外网能够访问的 URL，流量负载均衡，提供基于域名访问的虚拟主机等，相当于一个流量入口。它的基础构件叫做 Ingress Controller。
部署
构建 Ingress Controller
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.11.1/deploy/static/provider/baremetal/deploy.yaml
检查 Ingress Controller 是否创建完毕
root@k8s-master1:~# kubectl get pods --namespace=ingress-nginx
NAME READY STATUS RESTARTS AGE
ingress-nginx-admission-create-29fkf 0/1 Completed 0 47s
ingress-nginx-admission-patch-6fn6j 0/1 Completed 0 47s
ingress-nginx-controller-784997fdc7-rxkwb 0/1 Running 0 47s
编写 service 规则
apiVersion: v1
kind: Service
metadata:
name: service-static-web2
namespace: default
labels:
app: service-static-web2
spec:
type: ClusterIP
ports:
- port: 8080
protocol: TCP
targetPort: 80
selector:
app: pod-web-static
编写 Ingress 规则
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: ingress-static-web
namespace: default
spec:
ingressClassName: nginx
rules:
- host: web.test1.com
http:
paths:
- backend:
service:
name: service-static-web2
port:
number: 8080
path: /
pathType: Prefix
在 /etc/hosts中加入127.0.0.1 web.test1.com，并进行测试
root@k8s-master1:~# kubectl get service -ningress-nginx
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
ingress-nginx-controller NodePort 10.109.159.254 <none> 80:31284/TCP,443:30204/TCP 124m
ingress-nginx-controller-admission ClusterIP 10.100.3.205 <none> 443/TCP 124m
root@k8s-master1:~# curl http://web.test1.com:31284
<html><body><h1>This is a test</h1></body></html>