Using /addprefix middleware not found in k8s

Traefik Traefik v2
,
1

Hello everyone,

i would like to use the /addprefix middleware in a k8s cluster.
My traefik install is on latest version mit helm-install.

Required CRDs and RBACs are installed like described in here: Kubernetes IngressRoute & Traefik CRD - Traefik

If i try to apply this:

apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
  name: nodered-ui-prefix
spec:
  addprefix:
    prefix:
      - /ui

I just get this error:

error: error validating "middleware_addprefix.yaml": error validating data: ValidationError(Middleware.spec): unknown field "addprefix" in io.traefik.v1alpha1.Middleware.spec; if you choose to ignore these errors, turn validation off with --validate=false

The Middleware HTTP Docs also say that it's needed to install the middleware CRD Traefik Proxy HTTP Middleware Overview - Traefik

# As a Kubernetes Traefik IngressRoute
apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
  name: middlewares.traefik.io
spec:
  group: traefik.io
  version: v1alpha1
  names:
    kind: Middleware
    plural: middlewares
    singular: middleware
  scope: Namespaced

Which give that error:

error: error validating "middlewares_CRD.yaml": error validating data: [ValidationError(CustomResourceDefinition.spec): unknown field "version" in io.k8s.apiextensions-apiserver.pkg.apis.apiextensions.v1.CustomResourceDefinitionSpec, ValidationError(CustomResourceDefinition.spec): missing required field "versions" in io.k8s.apiextensions-apiserver.pkg.apis.apiextensions.v1.CustomResourceDefinitionSpec]; if you choose to ignore these errors, turn validation off with --validate=false

But if i describe my CustomResourceDefinition the addprefix is already there:

apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
  name: middlewares.traefik.io
spec:
  group: traefik.io
  names:
    kind: Middleware
    listKind: MiddlewareList
    plural: middlewares
    singular: middleware
  scope: Namespaced
  versions:
  - name: v1alpha1
    schema:
      openAPIV3Schema:
        description: 'Middleware is the CRD implementation of a Traefik Middleware.
          More info: https://doc.traefik.io/traefik/v2.10/middlewares/http/overview/'
        properties:
          apiVersion:
            description: 'APIVersion defines the versioned schema of this representation
              of an object. Servers should convert recognized schemas to the latest
              internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources'
            type: string
          kind:
            description: 'Kind is a string value representing the REST resource this
              object represents. Servers may infer this from the endpoint the client
              submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds'
            type: string
          metadata:
            type: object
          spec:
            description: MiddlewareSpec defines the desired state of a Middleware.
            properties:
              addPrefix:
                description: 'AddPrefix holds the add prefix middleware configuration.
                  This middleware updates the path of a request before forwarding
                  it. More info: https://doc.traefik.io/traefik/v2.10/middlewares/http/addprefix/'
                properties:
                  prefix:
                    description: Prefix is the string to add before the current path
                      in the requested URL. It should include a leading slash (/).
                    type: string
                type: object
            type: object
        required:
        - metadata
        - spec
        type: object
    served: true
    storage: true
status:
  acceptedNames:
    kind: Middleware
    listKind: MiddlewareList
    plural: middlewares
    singular: middleware
  storedVersions:
  - v1alpha1

So the final question is:
How to use middlewares in Kubernetes in my case?

2

I've found the solution(s) for the problem.
First of all i migrated ALL my resources to the new "traefik.io/v1alpha1" API-Version.

Then i deleted all older "trafik.containo.us" CRDs.

An then i found some syntax-problems in my middleware-yaml. Correct version is:

apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
  name: nodered-ui-prefix
spec:
  addPrefix:
    prefix: /ui
3

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