Nginx 入口重写目标不起作用

Question

我完全按照这里所说的做了：https://github.com/kubernetes/ingress-nginx/tree/master/docs/examples/rewrite#examples

$ echo '
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /$2
  name: rewrite
  namespace: default
spec:
  rules:
  - host: rewrite.bar.com
    http:
      paths:
      - backend:
          serviceName: coffee-svc
          servicePort: 80
        path: /something(/|$)(.*)
' | kubectl create -f -

创建入口，我将rewrite.bar.com 添加到我的/etc/hosts 到minikube 的ip。 coffee-svs 是此示例中的服务：https://github.com/nginxinc/NGINX-Demos/tree/master/kubernetes-demo-nginx-ingress-resources

但没有发生重写，我的用例与此处显示的完全相同：Another nginx ingress rewrite-target problem，但建议的解决方案不起作用。

当我执行curl rewrite.bar.com/something 时，会有一个404 Not Found 响应。

预期的行为是将rewrite.bar.com/something 重写为rewrite.bar.com/，然后在路径/ 上调用coffee-svc。

还做curl -I -k rewrite.bar.com/返回：

HTTP/1.1 404 Not Found
Server: nginx/1.17.9
Date: Sat, 02 May 2020 15:24:02 GMT
Content-Type: text/html
Content-Length: 153
Connection: keep-alive

我使用 helm 安装了 nginx ingress，使用 stable/nginx-ingress，当前版本为 0.30.0。

Kubernetes 版本是1.14。

编辑： 添加 ingress-controller-pod 日志

I0502 15:52:00.344425       7 flags.go:215] Watching for Ingress class: nginx
W0502 15:52:00.344820       7 flags.go:260] SSL certificate chain completion is disabled (--enable-ssl-chain-completion=false)
W0502 15:52:00.344909       7 client_config.go:543] Neither --kubeconfig nor --master was specified.  Using the inClusterConfig.  This might not work.
I0502 15:52:00.345341       7 main.go:193] Creating API client for https://10.96.0.1:443
I0502 15:52:00.355089       7 main.go:237] Running in Kubernetes cluster version v1.14 (v1.14.1) - git (clean) commit b7394102d6ef778017f2ca4046abbaa23b88c290 - platform linux/amd64
I0502 15:52:00.358184       7 main.go:91] Validated default/my-nginx-ingress-default-backend as the default backend.
I0502 15:52:00.836581       7 main.go:102] SSL fake certificate created /etc/ingress-controller/ssl/default-fake-certificate.pem
W0502 15:52:00.873934       7 store.go:628] Unexpected error reading configuration configmap: configmaps "my-nginx-ingress-controller" not found
I0502 15:52:00.911054       7 nginx.go:263] Starting NGINX Ingress controller
I0502 15:52:02.035037       7 event.go:281] Event(v1.ObjectReference{Kind:"Ingress", Namespace:"default", Name:"rewrite", UID:"60b7853f-8c86-11ea-b3ad-080027f64399", APIVersion:"networking.k8s.io/v1beta1", ResourceVersion:"367651", FieldPath:""}): type: 'Normal' reason: 'CREATE' Ingress default/rewrite
I0502 15:52:02.113846       7 nginx.go:307] Starting NGINX process
I0502 15:52:02.116614       7 leaderelection.go:242] attempting to acquire leader lease  default/ingress-controller-leader-nginx...
I0502 15:52:02.123127       7 controller.go:137] Configuration changes detected, backend reload required.
I0502 15:52:02.135944       7 status.go:86] new leader elected: my-nginx-ingress-controller-6fcc8d7f97-r9d8t
I0502 15:52:02.321762       7 controller.go:153] Backend successfully reloaded.
I0502 15:52:02.321833       7 controller.go:162] Initial sync, sleeping for 1 second.
I0502 15:52:55.451512       7 leaderelection.go:252] successfully acquired lease default/ingress-controller-leader-nginx
I0502 15:52:55.452458       7 status.go:86] new leader elected: my-nginx-ingress-controller-6fcc8d7f97-7p8g6
I0502 15:52:55.470245       7 status.go:274] updating Ingress default/rewrite status from [] to [{10.0.2.15 }]
I0502 15:52:55.475571       7 event.go:281] Event(v1.ObjectReference{Kind:"Ingress", Namespace:"default", Name:"rewrite", UID:"60b7853f-8c86-11ea-b3ad-080027f64399", APIVersion:"networking.k8s.io/v1beta1", ResourceVersion:"367750", FieldPath:""}): type: 'Normal' reason: 'UPDATE' Ingress default/rewrite
I0502 15:53:18.288519       7 controller.go:137] Configuration changes detected, backend reload required.
I0502 15:53:18.291422       7 event.go:281] Event(v1.ObjectReference{Kind:"Ingress", Namespace:"default", Name:"rewrite", UID:"60b7853f-8c86-11ea-b3ad-080027f64399", APIVersion:"networking.k8s.io/v1beta1", ResourceVersion:"367783", FieldPath:""}): type: 'Normal' reason: 'DELETE' Ingress default/rewrite
I0502 15:53:18.403753       7 controller.go:153] Backend successfully reloaded.
I0502 15:53:20.187998       7 event.go:281] Event(v1.ObjectReference{Kind:"Ingress", Namespace:"default", Name:"rewrite", UID:"0ba43588-8c8d-11ea-b3ad-080027f64399", APIVersion:"networking.k8s.io/v1beta1", ResourceVersion:"367788", FieldPath:""}): type: 'Normal' reason: 'CREATE' Ingress default/rewrite
I0502 15:53:21.623215       7 controller.go:137] Configuration changes detected, backend reload required.
I0502 15:53:21.796798       7 controller.go:153] Backend successfully reloaded.

Answer 1

最后我通过删除整个 minikube 集群解决了这个问题：

minikube delete
minikube start

在某个地方，不知何故影响入口的配置。然后它工作得很好。 Pitty 我不知道罪魁祸首的配置或部署。

Answer 2

curl 命令应该是

curl rewrite.bar.com/something --header "Host: rewrite.bar.com"

Host 标头是 nginx 用来了解哪个主机发送请求并为主机 rewrite.bar.com 应用入口规则的内容，并且重写按照规则中的定义进行。

如果您使用浏览器访问相同的 url，则此标头由浏览器自动发送。

使用下面的命令通过来自另一个 pod 的 curl 测试服务

kubectl run curl --image=radial/busyboxplus:curl -i --tty

If you don't see a command prompt, try pressing enter.

[ root@curl:/ ]$ curl coffee-svc