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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, 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, 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: myTlsSecret

  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: myTlsSecret

  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.