Migration: Steps needed between the versions

To add that CRD and enhance the permissions, the following definitions need to be applied to the cluster.

TraefikService

ClusterRole

kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: traefik-ingress-controller
rules:
  - apiGroups:
      - ""
    resources:
      - services
      - endpoints
      - secrets
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - extensions
    resources:
      - ingresses
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - extensions
    resources:
      - ingresses/status
      - update
  - apiGroups:
      - traefik.containo.us
    resources:
      - middlewares
      - ingressroutes
      - traefikservices
      - ingressroutetcps
      - tlsoptions
    verbs:
      - get
      - list
      - watch

After having both resources applied, Traefik will work properly.

v2.1 to v2.2

Headers middleware: accessControlAllowOrigin

accessControlAllowOrigin is deprecated. This field will be removed in future 2.x releases. Please configure your allowed origins in accessControlAllowOriginList instead.

Kubernetes CRD

In v2.2, new Kubernetes CRDs called TLSStore and IngressRouteUDP were added. While updating an installation to v2.2, one should apply that CRDs, and update the existing ClusterRole definition to allow Traefik to use that CRDs.

To add that CRDs and enhance the permissions, the following definitions need to be applied to the cluster.

TLSStore

apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: tlsstores.traefik.containo.us
spec:
  group: traefik.containo.us
  version: v1alpha1
  names:
    kind: TLSStore
    plural: tlsstores
    singular: tlsstore
  scope: Namespaced

IngressRouteUDP

apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
spec:
  group: traefik.containo.us
  version: v1alpha1
  names:
    kind: IngressRouteUDP
    plural: ingressrouteudps
    singular: ingressrouteudp
  scope: Namespaced

ClusterRole

After having both resources applied, Traefik will work properly.

Kubernetes Ingress

To enable HTTPS, it is not sufficient anymore to only rely on a TLS section in the Ingress.

Expose an Ingress on 80 and 443

Define the default TLS configuration on the HTTPS entry point.

Ingress

kind: Ingress
apiVersion: networking.k8s.io/v1beta1
metadata:
  name: example
spec:
  tls:
  - secretName: my-tls-secret
  rules:
  - host: example.com
    http:
      paths:
      - path: "/foo"
        backend:
          serviceName: example-com
          servicePort: 80

Entry points definition and enable Ingress provider:

File (YAML)

# Static configuration
  web:
    address: :80
  websecure:
    address: :443
    http:
      tls: {}
providers:
  kubernetesIngress: {}

# Static configuration
[entryPoints.web]
  address = ":80"
[entryPoints.websecure]
  address = ":443"
  [entryPoints.websecure.http]
    [entryPoints.websecure.http.tls]
[providers.kubernetesIngress]

CLI

Use TLS only on one Ingress

Define the TLS restriction with annotations.

Ingress

kind: Ingress
apiVersion: networking.k8s.io/v1beta1
metadata:
  name: example-tls
  annotations:
    traefik.ingress.kubernetes.io/router.entrypoints: websecure
    traefik.ingress.kubernetes.io/router.tls: "true"
spec:
  tls:
  - secretName: my-tls-secret
  rules:
  - host: example.com
    http:
      - path: ""
        backend:
          serviceName: example-com
          servicePort: 80

Entry points definition and enable Ingress provider:

File (YAML)

# Static configuration
entryPoints:
  web:
    address: :80
  websecure:
    address: :443
providers:
  kubernetesIngress: {}

File (TOML)

# Static configuration
[entryPoints.web]
  address = ":80"
[entryPoints.websecure]
  address = ":443"

CLI

v2.2.2 to v2.2.5

InsecureSNI removal

In v2.2.2 we introduced a new flag (insecureSNI) which was available as a global option to disable domain fronting. Since v2.2.5 this global option has been removed, and you should not use it anymore.

HostSNI rule matcher removal

In v2.2.2 we introduced a new rule matcher (HostSNI) for HTTP routers which was allowing to match the Server Name Indication at the router level. Since v2.2.5 this rule has been removed for HTTP routers, and you should not use it anymore.

The deprecated, legacy behavior of treating the CommonName field on X.509 certificates as a host name when no Subject Alternative Names are present, is now disabled by default.

It means that if one is using https with your backend servers, and a certificate with only a CommonName, Traefik will not try to match the server name indication with the CommonName anymore.

It can be temporarily re-enabled by adding the value x509ignoreCN=0 to the GODEBUG environment variable.

More information:

File Provider

The file parser has been changed, since v2.3 the unknown options/fields in a dynamic configuration file are treated as errors.

IngressClass

In v2.3, the support of IngressClass, which is available since Kubernetes version 1.18, has been introduced. In order to be able to use this new resource the Kubernetes RBAC must be updated.

v2.3 to v2.4

ServersTransport

In v2.4.0, the support of ServersTransport has been introduced. It is therefore necessary to update and CRD definitions.

v2.4.7 to v2.4.8

Non-ASCII Domain Names

This new behavior is intended to show what was failing silently previously and to help troubleshooting configuration issues. It doesn’t change the support for non-ASCII domain names in routers rules, which is not part of the Traefik feature set so far.

In order to use non-ASCII domain names in a router’s rule, one should use the Punycode form of the domain name. For more information, please read the part or TCP router rules part of the documentation.

Tracing Span

In v2.4.9, we changed span error to log only server errors (>= 500).

v2.4.9 to v2.4.10

In v2.4.10, the default value for allowCrossNamespace has been changed to false.

K8S ExternalName Service

In v2.4.10, by default, it is no longer authorized to reference Kubernetes ExternalName services. To allow it, the allowExternalNameServices option should be set to true.

v2.4 to v2.5

Kubernetes CRD

In v2.5, the Traefik CRDs have been updated to support the new API version apiextensions.k8s.io/v1. As required by apiextensions.k8s.io/v1, we have included the OpenAPI validation schema.

After deploying the new , the resources will be validated only on creation or update.

Please note that the unknown fields will not be pruned when migrating from apiextensions.k8s.io/v1beta1 to apiextensions.k8s.io/v1 CRDs. For more details check out the official documentation.

Kubernetes Ingress

Traefik v2.5 moves forward for the Ingress provider to support Kubernetes v1.22.

Traefik now supports only v1.14+ Kubernetes clusters, which means the support of extensions/v1beta1 API Version ingresses has been dropped.

The extensions/v1beta1 API Version should now be replaced either by networking.k8s.io/v1beta1 or by networking.k8s.io/v1 (as of Kubernetes v1.19+).

The support of the networking.k8s.io/v1beta1 API Version will stop in Kubernetes v1.22.

Headers middleware: ssl redirect options

sslRedirect, sslTemporaryRedirect, sslHost and sslForceHost are deprecated in Traefik v2.5.

For simple HTTP to HTTPS redirection, you may use .

For more advanced use cases, you can use either the RedirectScheme middleware or the .

Headers middleware: accessControlAllowOrigin

accessControlAllowOrigin is no longer supported in Traefik v2.5.