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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
      - networking.k8s.io
    resources:
      - ingresses
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - extensions
      - networking.k8s.io
    resources:
      - ingresses/status
    verbs:
      - update
  - apiGroups:
      - traefik.io
      - traefik.containo.us
    resources:
      - middlewares
      - middlewaretcps
      - ingressroutes
      - traefikservices
      - ingressroutetcps
      - ingressrouteudps
      - tlsoptions
      - tlsstores
      - serverstransports
    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
      - networking.k8s.io
    resources:
      - ingresses
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - extensions
      - networking.k8s.io
    resources:
      - ingresses/status
    verbs:
      - update
  - apiGroups:
      - traefik.containo.us
    resources:
      - middlewares
      - middlewaretcps
      - ingressroutes
      - traefikservices
      - ingressroutetcps
      - ingressrouteudps
      - tlsoptions
      - tlsstores
      - serverstransports
    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 cannot 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.

v2.5 to v2.6

HTTP/3

Traefik v2.6 introduces the AdvertisedPort option, which allows advertising, in the Alt-Svc header, a UDP port different from the one on which Traefik is actually listening (the EntryPoint's port). By doing so, it introduces a new configuration structure http3, which replaces the enableHTTP3 option (which therefore doesn't exist anymore). To enable HTTP/3 on an EntryPoint, please check out the HTTP/3 configuration documentation.

Kubernetes Gateway API Provider

In v2.6, the Kubernetes Gateway API provider now only supports the version v1alpha2 of the specification and route namespaces selectors, which requires Traefik to fetch and watch the cluster namespaces. Therefore, the RBAC and CRD definitions must be updated.

v2.6.0 to v2.6.1

Metrics

In v2.6.1, the metrics system does not support any more custom HTTP method verbs to prevent potential metrics cardinality overhead. In consequence, for metrics having the method label, if the HTTP method verb of a request is not one defined in the set of common methods for HTTP/1.1 or the PRI verb (for HTTP/2), the value for the method label becomes EXTENSION_METHOD, instead of the request's one.

Tracing

In v2.6.1, the Datadog tags added to a span changed from service.name to traefik.service.name and from router.name to traefik.router.name.

v2.8

TLS client authentication

In v2.8, the caOptional option is deprecated as TLS client authentication is a server side option. This option available in the ForwardAuth middleware, as well as in the HTTP, Consul, Etcd, Redis, ZooKeeper, Marathon, Consul Catalog, and Docker providers has no effect and must not be used anymore.

Consul Enterprise Namespaces

In v2.8, the namespace option of Consul and Consul Catalog providers is deprecated, please use the namespaces options instead.

Traefik Pilot

In v2.8, the pilot.token and pilot.dashboard options are deprecated. Please check our Blog for migration instructions later this year.

v2.8.2

Since v2.5.0, the PreferServerCipherSuites is deprecated and ignored by Go, in v2.8.2 the preferServerCipherSuites option is also deprecated and ignored in Traefik.

In v2.8.2, Traefik now reject certificates signed with the SHA-1 hash function. (details)

v2.9

Traefik Pilot

In v2.9, Traefik Pilot support has been removed.

v2.10

Nomad Namespace

In v2.10, the namespace option of the Nomad provider is deprecated, please use the namespaces options instead.

Kubernetes CRDs

In v2.10, the Kubernetes CRDs API Group traefik.containo.us is deprecated, and its support will end starting with Traefik v3. Please use the API Group traefik.io instead.

As the Kubernetes CRD provider still works with both API Versions (traefik.io/v1alpha1 and traefik.containo.us/v1alpha1), it means that for the same kind, namespace and name, the provider will only keep the traefik.io/v1alpha1 resource.

In addition, the Kubernetes CRDs API Version traefik.containo.us/v1alpha1 will not be supported in Traefik v3 itself.

Please note that it is a requirement to update the CRDs and the RBAC in the cluster before upgrading Traefik. To do so, please apply the required CRDs and RBAC manifests for v2.10:

kubectl apply -f https://raw.githubusercontent.com/traefik/traefik/v2.10/docs/content/reference/dynamic-configuration/kubernetes-crd-rbac.yml
kubectl apply -f https://raw.githubusercontent.com/traefik/traefik/v2.10/docs/content/reference/dynamic-configuration/kubernetes-crd-definition-v1.yml

Traefik Hub

In v2.10, Traefik Hub configuration has been removed because Traefik Hub v2 doesn't require this configuration.

v2.11

IPWhiteList (HTTP)

In v2.11, the IPWhiteList middleware is deprecated, please use the IPAllowList middleware instead.

IPWhiteList (TCP)

In v2.11, the IPWhiteList middleware is deprecated, please use the IPAllowList middleware instead.

TLS CipherSuites

By default, cipher suites without ECDHE support are no longer offered by either clients or servers during pre-TLS 1.3 handshakes. This change can be reverted with the tlsrsakex=1 GODEBUG setting. (https://go.dev/doc/go1.22#crypto/tls)

The RSA key exchange cipher suites are way less secure than the modern ECDHE cipher suites and exposes to potential vulnerabilities like the Marvin Attack. Decision has been made to support ECDHE cipher suites only by default.

The following ciphers have been removed from the default list:

  • TLS_RSA_WITH_AES_128_CBC_SHA
  • TLS_RSA_WITH_AES_256_CBC_SHA
  • TLS_RSA_WITH_AES_128_GCM_SHA256
  • TLS_RSA_WITH_AES_256_GCM_SHA384

To enable these ciphers, please set the option CipherSuites in your TLS configuration or set the environment variable GODEBUG=tlsrsakex=1.

Minimum TLS Version

By default, the minimum version offered by crypto/tls servers is now TLS 1.2 if not specified with config.MinimumVersion, matching the behavior of crypto/tls clients. This change can be reverted with the tls10server=1 GODEBUG setting. (https://go.dev/doc/go1.22#crypto/tls)

To enable TLS 1.0, please set the option MinVersion to VersionTLS10 in your TLS configuration or set the environment variable GODEBUG=tls10server=1.

v2.11.1

Maximum Router Priority Value

Before v2.11.1, the maximum user-defined router priority value is:

  • MaxInt32 for 32-bit platforms,
  • MaxInt64 for 64-bit platforms.

Please check out the go documentation for more information.

In v2.11.1, Traefik reserves a range of priorities for its internal routers and now, the maximum user-defined router priority value is:

  • (MaxInt32 - 1000) for 32-bit platforms,
  • (MaxInt64 - 1000) for 64-bit platforms.

EntryPoint.Transport.RespondingTimeouts.

Starting with v2.11.1 the following timeout options are deprecated:

  • <entryPoint>.transport.respondingTimeouts.readTimeout
  • <entryPoint>.transport.respondingTimeouts.writeTimeout
  • <entryPoint>.transport.respondingTimeouts.idleTimeout

They have been replaced by:

  • <entryPoint>.transport.respondingTimeouts.http.readTimeout
  • <entryPoint>.transport.respondingTimeouts.http.writeTimeout
  • <entryPoint>.transport.respondingTimeouts.http.idleTimeout

EntryPoint.Transport.RespondingTimeouts.TCP.LingeringTimeout

Starting with v2.11.1 a new lingeringTimeout entryPoints option has been introduced, with a default value of 2s.

The lingering timeout defines the maximum duration between each TCP read operation on the connection. As a layer 4 timeout, it applies during HTTP handling but respects the configured HTTP server readTimeout.

This change avoids Traefik instances with the default configuration hanging while waiting for bytes to be read on the connection.

We suggest to adapt this value accordingly to your situation. The new default value is purposely narrowed and can close the connection too early.

Increasing the lingeringTimeout value could be the solution notably if you are dealing with the following errors:

  • TCP: Error while handling TCP connection: readfrom tcp X.X.X.X:X->X.X.X.X:X: read tcp X.X.X.X:X->X.X.X.X:X: i/o timeout
  • HTTP: '499 Client Closed Request' caused by: context canceled
  • HTTP: ReverseProxy read error during body copy: read tcp X.X.X.X:X->X.X.X.X:X: use of closed network connection

v2.11.2

LingeringTimeout

Starting with v2.11.2 the <entrypoint>.transport.respondingTimeouts.tcp.lingeringTimeout introduced in v2.11.1 has been removed.

RespondingTimeouts.TCP and RespondingTimeouts.HTTP

Starting with v2.11.2 the respondingTimeouts.tcp and respondingTimeouts.http sections introduced in v2.11.1 have been removed. To configure the responding timeouts, please use the respondingTimeouts section.

EntryPoint.Transport.RespondingTimeouts.ReadTimeout

Starting with v2.11.2 the entryPoints readTimeout option default value changed to 60 seconds.

For HTTP, this option defines the maximum duration for reading the entire request, including the body. For TCP, this option defines the maximum duration for the first bytes to be read on the connection.

The default value was previously set to zero, which means no timeout.

This change has been done to avoid Traefik instances with the default configuration to be hanging forever while waiting for bytes to be read on the connection.

Increasing the readTimeout value could be the solution notably if you are dealing with the following errors:

  • TCP: Error while handling TCP connection: readfrom tcp X.X.X.X:X->X.X.X.X:X: read tcp X.X.X.X:X->X.X.X.X:X: i/o timeout
  • HTTP: '499 Client Closed Request' caused by: context canceled
  • HTTP: ReverseProxy read error during body copy: read tcp X.X.X.X:X->X.X.X.X:X: use of closed network connection

v2.11.3

Connection headers

In v2.11.3, the handling of the request Connection headers directives has changed to prevent any abuse. Before, Traefik removed any header listed in the Connection header just before forwarding the request to the backends. Now, Traefik removes the headers listed in the Connection header as soon as the request is handled. As a consequence, middlewares do not have access to those Connection headers, and a new option has been introduced to specify which ones could go through the middleware chain before being removed: <entrypoint>.forwardedHeaders.connection.

Please check out the entrypoint forwarded headers connection option configuration documentation.

v2.11.14

X-Forwarded-Prefix

In v2.11.14, the X-Forwarded-Prefix header is now handled like the other X-Forwarded-* headers: Traefik removes it when it's sent from an untrusted source. Please refer to the Forwarded headers documentation for more details.