Kubernetes ingress 不工作，默认后端 404

Question

我是 Kubernetes 的新手。我正在为 K8S 使用 GKE 托管服务。有 2 个部署 nginx、httpd，并为这 2 个部署创建了 NodePort 服务。

我正在尝试为服务创建入口规则。 nginx 入口控制器是通过 helm 安装的。我有一个来自 freenom 的域，并将 Google 云 DNS 设置为使用静态 public IP。当我尝试访问入口 URL (domain/nginx) 时，它给出了：

"default backend - 404"

部署：

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx
  labels:
    name: nginx
spec:
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: nginx
  replicas: 1
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: httpd
  labels:
    name: httpd
spec:
  selector:
    matchLabels:
      app: httpd
  template:
    metadata:
      labels:
        app: httpd
    spec:
      containers:
        - name: httpd
          image: httpd
  replicas: 1

服务：

apiVersion: v1
kind: Service
metadata:
  labels:
    name: nginx
  name: nginx-service
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: nginx
  type: NodePort

与 httpd 服务相同

入口：

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: test
  annotations:
    kubernetes.io/ingress.global-static-ip-name: testingk8s
spec:
  rules:
    - host: xyz.tk
      http: 
        paths:
          - path: /nginx
            backend:
              serviceName: nginx-service
              servicePort: 80
          - path: /httpd
            backend:
              serviceName: httpd-service
              servicePort: 80

入口描述：

Default backend:  default-http-backend:80 (10.48.0.7:8080)
Rules:
  Host           Path  Backends
  ----           ----  --------
  xyz.tk
                 /nginx   nginx-service:80 (10.48.0.25:80)
                 /httpd   httpd-service:80 (10.48.0.26:80)
Annotations:     ingress.kubernetes.io/backends:
                   {"k8s-be-30916--413d33a91e61ca5d":"HEALTHY","k8s-be-31376--413d33a91e61ca5d":"HEALTHY","k8s-be-32702--413d33a91e61ca5d":"HEALTHY"}

入口控制器 Pod 日志：

I0812 09:38:34.405188       6 event.go:278] Event(v1.ObjectReference{Kind:"Ingress", Namespace:"nginx", Name:"test", UID:"61991dbd-a361-47d2-88cc-548a7c43e743", APIVersion:"networking.k8s.io/v1beta1", ResourceVersion:"316030", FieldPath:""}): type: 'Normal' reason: 'CREATE' Ingress nginx/test
I0812 09:38:34.405815       6 controller.go:139] Configuration changes detected, backend reload required.
I0812 09:38:34.532163       6 controller.go:155] Backend successfully reloaded.
I0812 09:38:41.369315       6 status.go:275] updating Ingress nginx/test status from [] to [{35.192.136.218 }]
I0812 09:38:41.374080       6 event.go:278] Event(v1.ObjectReference{Kind:"Ingress", Namespace:"nginx", Name:"test", UID:"61991dbd-a361-47d2-88cc-548a7c43e743", APIVersion:"networking.k8s.io/v1beta1", ResourceVersion:"316057", FieldPath:""}): type: 'Normal' reason: 'UPDATE' Ingress nginx/test

Answer 1

添加注释 kubernetes.io/ingress.class: nginx 和 nginx.ingress.kubernetes.io/rewrite-target: /。所以入口看起来像下面

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: test
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
    kubernetes.io/ingress.class: nginx
spec:
  rules:
    - host: xyz.tk
      http: 
        paths:
          - path: /nginx
            backend:
              serviceName: nginx-service
              servicePort: 80
          - path: /httpd
            backend:
              serviceName: httpd-service
              servicePort: 80

Answer 2

当您安装 HELM chart 时，会为 nginx-insgress 创建一个具有随机 IP 的 LoadBalancer，这就是您不能在 loadBalancer 中使用 pre-created IP 的原因。

尝试安装 controller.service.loadBalancerIP 配置的 HELM chart：

controller.service.loadBalancerIP IP address to assign to load balancer (if supported)

helm install --name nginx-ingress stable/nginx-ingress \
      --set controller.service.loadBalancerIP=<YOUR_EXTERNAL_IP>

NOTE: Yor IP must be in the same region of the cluster. Please refer to this documentation

Kubernetes ingress 不工作，默认后端 404

Kubernetes ingress is not working , default backend 404

kubernetes

google-kubernetes-engine

nginx-ingress