microk8s 中的入口未分配地址

Question

我的问题是为什么入口不为服务分配地址？

首先我创建了 3 个部署：

kubectl create deployment cheddar --image=errm/cheese:cheddar
kubectl create deployment stilton --image=errm/cheese:stilton
kubectl create deployment wensleydale --image=errm/cheese:wensleydale

其次，我公开了这 3 个部署：

kubectl expose deployment cheddar --port=80                  
kubectl expose deployment stilton --port=80                  
kubectl expose deployment wensleydale --port=80

然后我用

kubectl apply -f ingress.yaml

应用我的ingress.yaml，ingress.yaml内容是：

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: cheddar
spec:
  ingressClassName: nginx
  rules:
  - host: cheddar.127.0.0.1.nip.io
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: cheddar
            port:
              number: 80
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: stilton
spec:
  ingressClassName: nginx
  rules:
  - host: stilton.127.0.0.1.nip.io
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: stilton
            port:
              number: 80
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: wensleydale
spec:
  ingressClassName: nginx
  rules:
  - host: wensleydale.127.0.0.1.nip.io
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: wensleydale
            port:
              number: 80
---

但是当我路由这条路径时，结果仍然是

404-nginx

kubectl get ingress

返回：

NAME          CLASS   HOSTS                          ADDRESS   PORTS   AGE
cheddar       nginx   cheddar.127.0.0.1.nip.io                 80      43s
stilton       nginx   stilton.127.0.0.1.nip.io                 80      43s
wensleydale   nginx   wensleydale.127.0.0.1.nip.io             80      43s

NOTE1：我在 ubuntu 上使用 microk8s，我的集群版本是：

v1.21.7-3+7700880a5c71e2

➜  ~ k get no
NAME   STATUS   ROLES    AGE   VERSION
ali    Ready    <none>   8d    v1.21.7-3+7700880a5c71e2

➜  ~ kubectl version
Client Version: version.Info{Major:"1", Minor:"21+", GitVersion:"v1.21.7-3+7700880a5c71e2", GitCommit:"7700880a5c71e25c44491ef5c7d7fb30527d8337", GitTreeState:"clean", BuildDate:"2021-11-17T22:07:23Z", GoVersion:"go1.16.10", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"21+", GitVersion:"v1.21.7-3+7700880a5c71e2", GitCommit:"7700880a5c71e25c44491ef5c7d7fb30527d8337", GitTreeState:"clean", BuildDate:"2021-11-17T22:02:47Z", GoVersion:"go1.16.10", Compiler:"gc", Platform:"linux/amd64"}

注意2：我已经通过此命令启用了入口扩展：

microk8s enable ingress

Answer 1

如果您使用的是裸机集群，则必须使用诸如 Metallb 之类的东西。 Kubernetes 没有实现网络负载均衡器，因此无法为您的入口分配 IP 地址。

既然你使用的是microk8s，你可以使用

microk8s enable metallb

如果您使用的是 aws、gcp、aks，您可以在他们的文档中找到它。

对于裸机，请参阅以下内容： https://metalb.org/