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Migration: Steps needed between the versions

v2.0 to v2.1

Kubernetes CRD

In v2.1, a new Kubernetes CRD called TraefikService was added. While updating an installation to v2.1, one should apply that CRD, and update the existing ClusterRole definition to allow Traefik to use that CRD.

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

apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: traefikservices.traefik.containo.us

spec:
  group: traefik.containo.us
  version: v1alpha1
  names:
    kind: TraefikService
    plural: traefikservices
    singular: traefikservice
  scope: Namespaced
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
    verbs:
      - 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.

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

apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: ingressrouteudps.traefik.containo.us

spec:
  group: traefik.containo.us
  version: v1alpha1
  names:
    kind: IngressRouteUDP
    plural: ingressrouteudps
    singular: ingressrouteudp
  scope: Namespaced

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
    verbs:
      - update
  - apiGroups:
      - traefik.containo.us
    resources:
      - middlewares
      - ingressroutes
      - traefikservices
      - ingressroutetcps
      - ingressrouteudps
      - tlsoptions
      - tlsstores
    verbs:
      - get
      - list
      - watch

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.

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:

# Static configuration

entryPoints:
  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]
# Static configuration

--entryPoints.web.address=:80
--entryPoints.websecure.address=:443
--entryPoints.websecure.http.tls=true
--providers.kubernetesIngress=true

Use TLS only on one Ingress

Define the TLS restriction with annotations.

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:
      paths:
      - path: ""
        backend:
          serviceName: example-com
          servicePort: 80

Entry points definition and enable Ingress provider:

# Static configuration

entryPoints:
  web:
    address: :80
  websecure:
    address: :443

providers:
  kubernetesIngress: {}
# Static configuration

[entryPoints.web]
  address = ":80"

[entryPoints.websecure]
  address = ":443"

[providers.kubernetesIngress]
# Static configuration

--entryPoints.web.address=:80
--entryPoints.websecure.address=:443
--providers.kubernetesIngress=true

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.

v2.2 to v2.3

X.509 CommonName Deprecation

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: https://golang.org/doc/go1.15#commonname

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 RBAC and CRD definitions.

v2.4.7 to v2.4.8

Non-ASCII Domain Names

In v2.4.8, we introduced a new check on domain names used in HTTP router rule Host and HostRegexp expressions, and in TCP router rule HostSNI expression. This check ensures that provided domain names don't contain non-ASCII characters. If not, an error is raised, and the associated router will be shown as invalid in the dashboard.

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 HTTP routers rule part or TCP router rules part of the documentation.

v2.4.8 to v2.4.9

Tracing Span

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

v2.4.9 to v2.4.10

K8S CrossNamespace

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 Traefik CRDs, 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 EntryPoints redirections.

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

Headers middleware: accessControlAllowOrigin

accessControlAllowOrigin is no longer supported in Traefik v2.5.

X.509 CommonName Deprecation Bis

Following up on the deprecation started previously, as the x509ignoreCN=0 value for the GODEBUG is deprecated in Go 1.17, the legacy behavior related to the CommonName field can not be enabled at all anymore.

v2.5.3 to v2.5.4

Errors middleware

In v2.5.4, when the errors service is configured with the PassHostHeader option to true (default), the forwarded Host header value is now set to the client request Host value and not 0.0.0.0. Check out the Errors middleware documentation for more details.