microk8s使用ingress对外提供web服务

1. 启用 ingress

$ microk8s.status #查看系统模块
$ microk8s.enable registry ingress

1. 创建服务, selector 中是提供服务器 pod 的名称，同时暴露 80 端口出来

$ cat <<EOF | microk8s.kubectl apply -f -
apiVersion: v1
kind: Service
metadata:
  name: my-web
spec:
  selector:
    app: my-nginx
  ports:
    - protocol: TCP
      port: 80
      targetPort: 80
EOF

1. 创建 ingress，配置 rule 把流量重定向至指定服务。ingress 允许使用不同厂商controller 实现

• 多域名

$ microk8s.kubectl get ingress
$ cat <<EOF | microk8s.kubectl apply -f -
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: web-ingress
  annotations:
    kubernetes.io/ingress.class: nginx
spec:
  rules:
  - host: demo1.example.com
    http:
      paths:
      - backend:
          serviceName: my-web
          servicePort: 80
  - host: demo2.example.com
    http:
      paths:
      - backend:
          serviceName: my-web2
          servicePort: 80
EOF

• 多路径

$ cat <<EOF | microk8s.kubectl apply -f -
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: web-ingress-rewrite
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/rewrite-target: /$2
spec:
  rules:
  - host: demo3.example.com
    http:
      paths:
      - path: /web(/|$)(.*)
        backend:
          serviceName: my-web
          servicePort: 80
EOF
$ microk8s.kubectl get ingress
$ microk8s.kubectl describe ingress # 查看ingress详情
$ microk8s.kubectl edit ingress #编辑ingress

注意 nginx 多路径和多域名可以同时存在，可以创建多个 ingress

参考资料

https://kubernetes.io/docs/concepts/services-networking/ingress/ https://kubernetes.github.io/ingress-nginx/examples/rewrite/ https://www.regular-expressions.info/refcapture.html