traefik/docs/content/migration/v1-to-v2.md

# Migration Guide: From v1 to v2

How to Migrate from Traefik v1 to Traefik v2.
{: .subtitle }

The version 2 of Traefik introduces a number of breaking changes,
which require one to update their configuration when they migrate from v1 to v2.
The goal of this page is to recapitulate all of these changes, and in particular to give examples,
feature by feature, of how the configuration looked like in v1, and how it now looks like in v2.

!!! info "Migration Helper"

    We created a tool to help during the migration: [traefik-migration-tool](https://github.com/traefik/traefik-migration-tool)

    This tool allows to:

    - convert `Ingress` to Traefik `IngressRoute` resources.
    - convert `acme.json` file from v1 to v2 format.
    - migrate the static configuration contained in the file `traefik.toml` to a Traefik v2 file.

## Frontends and Backends Are Dead... <br/>... Long Live Routers, Middlewares, and Services

During the transition from v1 to v2, a number of internal pieces and components of Traefik were rewritten and reorganized.
As such, the combination of core notions such as frontends and backends has been replaced with the combination of [routers](../routing/routers/index.md), [services](../routing/services/index.md), and [middlewares](../middlewares/overview.md).

Typically, a router replaces a frontend, and a service assumes the role of a backend, with each router referring to a service.
However, even though a backend was in charge of applying any desired modification on the fly to the incoming request,
the router defers that responsibility to another component.
Instead, a dedicated middleware is now defined for each kind of such modification.
Then any router can refer to an instance of the wanted middleware.

!!! example "One frontend with basic auth and one backend, become one router, one service, and one basic auth middleware."

    !!! info "v1"

    ```yaml tab="Docker"
    labels:
      - "traefik.frontend.rule=Host:test.localhost;PathPrefix:/test"
      - "traefik.frontend.auth.basic.users=test:$$apr1$$H6uskkkW$$IgXLP6ewTrSuBkTrqE8wj/,test2:$$apr1$$d9hr9HBB$$4HxwgUir3HP4EsggP/QNo0"
    ```

    ```yaml tab="K8s Ingress"
    apiVersion: networking.k8s.io/v1beta1
    kind: Ingress
    metadata:
      name: traefik
      namespace: kube-system
      annotations:
        kubernetes.io/ingress.class: traefik
        traefik.ingress.kubernetes.io/rule-type: PathPrefix
    spec:
      rules:
      - host: test.localhost
        http:
          paths:
          - path: /test
            backend:
              serviceName: server0
              servicePort: 80
          - path: /test
            backend:
              serviceName: server1
              servicePort: 80
    ```

    ```toml tab="File (TOML)"
    [frontends]
      [frontends.frontend1]
        entryPoints = ["http"]
        backend = "backend1"

        [frontends.frontend1.routes]
          [frontends.frontend1.routes.route0]
            rule = "Host:test.localhost"
          [frontends.frontend1.routes.route0]
            rule = "PathPrefix:/test"

        [frontends.frontend1.auth]
          [frontends.frontend1.auth.basic]
            users = [
              "test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/",
              "test2:$apr1$d9hr9HBB$4HxwgUir3HP4EsggP/QNo0",
            ]

    [backends]
      [backends.backend1]
        [backends.backend1.servers.server0]
          url = "http://10.10.10.1:80"
        [backends.backend1.servers.server1]
          url = "http://10.10.10.2:80"

        [backends.backend1.loadBalancer]
          method = "wrr"
    ```

    !!! info "v2"

    ```yaml tab="Docker"
    labels:
      - "traefik.http.routers.router0.rule=Host(`test.localhost`) && PathPrefix(`/test`)"
      - "traefik.http.routers.router0.middlewares=auth"
      - "traefik.http.middlewares.auth.basicauth.users=test:$$apr1$$H6uskkkW$$IgXLP6ewTrSuBkTrqE8wj/,test2:$$apr1$$d9hr9HBB$$4HxwgUir3HP4EsggP/QNo0"
    ```

    ```yaml tab="K8s IngressRoute"
    # The definitions below require the definitions for the Middleware and IngressRoute kinds.
    # https://doc.traefik.io/traefik/v2.3/reference/dynamic-configuration/kubernetes-crd/#definitions
    apiVersion: traefik.containo.us/v1alpha1
    kind: Middleware
    metadata:
      name: basicauth
      namespace: foo

    spec:
      basicAuth:
        users:
          - test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/
          - test2:$apr1$d9hr9HBB$4HxwgUir3HP4EsggP/QNo0

    ---
    apiVersion: traefik.containo.us/v1alpha1
    kind: IngressRoute
    metadata:
      name: ingressroutebar

    spec:
      entryPoints:
        - http
      routes:
      - match: Host(`test.localhost`) && PathPrefix(`/test`)
        kind: Rule
        services:
        - name: server0
          port: 80
        - name: server1
          port: 80
        middlewares:
        - name: basicauth
          namespace: foo
    ```

    ```yaml tab="File (YAML)"
    http:
      routers:
        router0:
          rule: "Host(`test.localhost`) && PathPrefix(`/test`)"
          service: my-service
          middlewares:
            - auth

      services:
        my-service:
          loadBalancer:
            servers:
              - url: http://10.10.10.1:80
              - url: http://10.10.10.2:80

      middlewares:
        auth:
          basicAuth:
            users:
              - "test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/"
              - "test2:$apr1$d9hr9HBB$4HxwgUir3HP4EsggP/QNo0"
    ```

    ```toml tab="File (TOML)"
    [http.routers]
      [http.routers.router0]
        rule = "Host(`test.localhost`) && PathPrefix(`/test`)"
        middlewares = ["auth"]
        service = "my-service"

    [http.services]
      [[http.services.my-service.loadBalancer.servers]]
        url = "http://10.10.10.1:80"
      [[http.services.my-service.loadBalancer.servers]]
        url = "http://10.10.10.2:80"

    [http.middlewares]
      [http.middlewares.auth.basicAuth]
        users = [
          "test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/",
          "test2:$apr1$d9hr9HBB$4HxwgUir3HP4EsggP/QNo0",
        ]
    ```

## TLS Configuration is Now Dynamic, per Router.

TLS parameters used to be specified in the static configuration, as an entryPoint field.
With Traefik v2, a new dynamic TLS section at the root contains all the desired TLS configurations.
Then, a [router's TLS field](../routing/routers/index.md#tls) can refer to one of the [TLS configurations](../https/tls.md) defined at the root, hence defining the [TLS configuration](../https/tls.md) for that router.

!!! example "TLS on websecure entryPoint becomes TLS option on Router-1"

    !!! info "v1"

    ```toml tab="File (TOML)"
    # static configuration
    [entryPoints]
      [entryPoints.websecure]
        address = ":443"

        [entryPoints.websecure.tls]
          minVersion = "VersionTLS12"
          cipherSuites = [
            "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
            "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
            "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256",
            "TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256",
            "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
            "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
          ]
          [[entryPoints.websecure.tls.certificates]]
            certFile = "path/to/my.cert"
            keyFile = "path/to/my.key"
    ```

    ```bash tab="CLI"
    --entryPoints='Name:websecure Address::443 TLS:path/to/my.cert,path/to/my.key TLS.MinVersion:VersionTLS12 TLS.CipherSuites:TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256'
    ```

    !!! info "v2"

    ```yaml tab="File (YAML)"
    http:
      routers:
        Router-1:
          rule: "Host(`example.com`)"
          service: service-id
          # will terminate the TLS request
          tls:
            options: myTLSOptions

    tls:
      certificates:
        - certFile: /path/to/domain.cert
          keyFile: /path/to/domain.key
      options:
        myTLSOptions:
          minVersion: VersionTLS12
          cipherSuites:
	        - TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
	        - TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
	        - TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
	        - TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
	        - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
    ```

    ```toml tab="File (TOML)"
    # dynamic configuration
    [http.routers]
      [http.routers.Router-1]
        rule = "Host(`example.com`)"
        service = "service-id"
        # will terminate the TLS request
        [http.routers.Router-1.tls]
          options = "myTLSOptions"

    [[tls.certificates]]
      certFile = "/path/to/domain.cert"
      keyFile = "/path/to/domain.key"

    [tls.options]
      [tls.options.myTLSOptions]
        minVersion = "VersionTLS12"
        cipherSuites = [
          "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
          "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
          "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256",
          "TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256",
          "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
          "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
        ]
    ```

    ```yaml tab="K8s IngressRoute"
    # The definitions below require the definitions for the TLSOption and IngressRoute kinds.
    # https://doc.traefik.io/traefik/v2.3/reference/dynamic-configuration/kubernetes-crd/#definitions
    apiVersion: traefik.containo.us/v1alpha1
    kind: TLSOption
    metadata:
      name: mytlsoption
      namespace: default

    spec:
      minVersion: VersionTLS12
      cipherSuites:
	    - TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
	    - TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
	    - TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
	    - TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
	    - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

    ---
    apiVersion: traefik.containo.us/v1alpha1
    kind: IngressRoute
    metadata:
      name: ingressroutebar

    spec:
      entryPoints:
        - web
      routes:
        - match: Host(`example.com`)
          kind: Rule
          services:
            - name: whoami
              port: 80
      tls:
        options:
          name: mytlsoption
          namespace: default
    ```

    ```yaml tab="Docker"
    labels:
      # myTLSOptions must be defined by another provider, in this instance in the File Provider.
      # see the cross provider section
      - "traefik.http.routers.router0.tls.options=myTLSOptions@file"
    ```

## HTTP to HTTPS Redirection is Now Configured on Routers

Previously on Traefik v1, the redirection was applied on an entry point or on a frontend.
With Traefik v2 it is applied on an entry point or a [Router](../routing/routers/index.md).

To apply a redirection:

- on an entry point, the [HTTP redirection](../routing/entrypoints.md#redirection) has to be configured.
- on a router, one of the redirect middlewares, [RedirectRegex](../middlewares/redirectregex.md) or [RedirectScheme](../middlewares/redirectscheme.md), has to be configured and added to the router middlewares list.

!!! example "Global HTTP to HTTPS redirection"

    !!! info "v1"

    ```toml tab="File (TOML)"
    # static configuration
    defaultEntryPoints = ["web", "websecure"]

    [entryPoints]
      [entryPoints.web]
        address = ":80"
        [entryPoints.web.redirect]
          entryPoint = "websecure"

      [entryPoints.websecure]
        address = ":443"
        [entryPoints.websecure.tls]
    ```

    ```bash tab="CLI"
    --entrypoints=Name:web Address::80 Redirect.EntryPoint:websecure
    --entryPoints='Name:websecure Address::443 TLS'
    ```

    !!! info "v2"

    ```yaml tab="File (YAML)"
    # traefik.yml
    ## static configuration

    entryPoints:
      web:
        address: ":80"
        http:
          redirections:
            entrypoint:
              to: websecure
              scheme: https

      websecure:
        address: ":443"
    ```

    ```toml tab="File (TOML)"
    # traefik.toml
    ## static configuration

    [entryPoints.web]
      address = ":80"
      [entryPoints.web.http.redirections.entryPoint]
        to = "websecure"
        scheme = "https"

    [entryPoints.websecure]
      address = ":443"
    ```

    ```bash tab="CLI"
    ## static configuration

    --entrypoints.web.address=:80
    --entrypoints.web.http.redirections.entrypoint.to=websecure
    --entrypoints.web.http.redirections.entrypoint.scheme=https
    --entrypoints.websecure.address=:443
    --providers.docker=true
    ```

!!! example "HTTP to HTTPS redirection per domain"

    !!! info "v1"

    ```toml tab="File (TOML)"
    [entryPoints]
      [entryPoints.web]
        address = ":80"

      [entryPoints.websecure]
        address = ":443"
        [entryPoints.websecure.tls]

    [file]

    [frontends]
      [frontends.frontend1]
        entryPoints = ["web", "websecure"]
        [frontends.frontend1.routes]
          [frontends.frontend1.routes.route0]
            rule = "Host:example.net"
        [frontends.frontend1.redirect]
          entryPoint = "websecure"
    ```

    !!! info "v2"

    ```yaml tab="Docker"
    labels:
      traefik.http.routers.app.rule: Host(`example.net`)
      traefik.http.routers.app.entrypoints: web
      traefik.http.routers.app.middlewares: https_redirect

      traefik.http.routers.appsecured.rule: Host(`example.net`)
      traefik.http.routers.appsecured.entrypoints: websecure
      traefik.http.routers.appsecured.tls: true

      traefik.http.middlewares.https_redirect.redirectscheme.scheme: https
      traefik.http.middlewares.https_redirect.redirectscheme.permanent: true
    ```

    ```yaml tab="K8s IngressRoute"
    apiVersion: traefik.containo.us/v1alpha1
    kind: IngressRoute
    metadata:
      name: http-redirect-ingressroute

    spec:
      entryPoints:
        - web
      routes:
        - match: Host(`example.net`)
          kind: Rule
          services:
            - name: whoami
              port: 80
          middlewares:
            - name: https-redirect

    ---
    apiVersion: traefik.containo.us/v1alpha1
    kind: IngressRoute
    metadata:
      name: https-ingressroute

    spec:
      entryPoints:
        - websecure
      routes:
        - match: Host(`foo`)
          kind: Rule
          services:
            - name: whoami
              port: 80
      tls: {}

    ---
    apiVersion: traefik.containo.us/v1alpha1
    kind: Middleware
    metadata:
      name: https-redirect
    spec:
      redirectScheme:
        scheme: https
        permanent: true
    ```

    ```yaml tab="File (YAML)"
    ## dynamic configuration
    # dynamic-conf.yml

    http:
      routers:
        router0:
          rule: "Host(`example.net`)"
          entryPoints:
            - web
          middlewares:
            - https_redirect
          service: my-service

        router1:
          rule: "Host(`example.net`)"
          entryPoints:
            - websecure
          service: my-service
          tls: {}

      middlewares:
        https-redirect:
          redirectScheme:
            scheme: https
            permanent: true
    ```

    ```toml tab="File (TOML)"
    ## dynamic configuration
    # dynamic-conf.toml

    [http.routers]
      [http.routers.router0]
        rule = "Host(`example.net`)"
        service = "my-service"
        entrypoints = ["web"]
        middlewares = ["https_redirect"]

    [http.routers.router1]
        rule = "Host(`example.net`)"
        service = "my-service"
        entrypoints = ["websecure"]
        [http.routers.router1.tls]

    [http.middlewares]
      [http.middlewares.https_redirect.redirectScheme]
        scheme = "https"
        permanent = true
    ```

## Strip and Rewrite Path Prefixes

With the new core notions of v2 (introduced earlier in the section
["Frontends and Backends Are Dead... Long Live Routers, Middlewares, and Services"](#frontends-and-backends-are-dead-long-live-routers-middlewares-and-services)),
transforming the URL path prefix of incoming requests is configured with [middlewares](../middlewares/overview.md),
after the routing step with [router rule `PathPrefix`](../routing/routers/index.md#rule).

Use Case: Incoming requests to `http://example.org/admin` are forwarded to the webapplication "admin",
with the path `/admin` stripped, e.g. to `http://<IP>:<port>/`. In this case, you must:

- First, configure a router named `admin` with a rule matching at least the path prefix with the `PathPrefix` keyword,
- Then, define a middleware of type [`stripprefix`](../middlewares/stripprefix.md), which removes the prefix `/admin`, associated to the router `admin`.

!!! example "Strip Path Prefix When Forwarding to Backend"

    !!! info "v1"

    ```yaml tab="Docker"
    labels:
      - "traefik.frontend.rule=Host:example.org;PathPrefixStrip:/admin"
    ```

    ```yaml tab="Kubernetes Ingress"
    apiVersion: networking.k8s.io/v1beta1
    kind: Ingress
    metadata:
      name: traefik
      annotations:
        kubernetes.io/ingress.class: traefik
        traefik.ingress.kubernetes.io/rule-type: PathPrefixStrip
    spec:
      rules:
      - host: example.org
        http:
          paths:
          - path: /admin
            backend:
              serviceName: admin-svc
              servicePort: admin
    ```

    ```toml tab="File (TOML)"
    [frontends.admin]
      [frontends.admin.routes.admin_1]
      rule = "Host:example.org;PathPrefixStrip:/admin"
    ```

    !!! info "v2"

    ```yaml tab="Docker"
    labels:
      - "traefik.http.routers.admin.rule=Host(`example.org`) && PathPrefix(`/admin`)"
      - "traefik.http.routers.admin.middlewares=admin-stripprefix"
      - "traefik.http.middlewares.admin-stripprefix.stripprefix.prefixes=/admin"
    ```

    ```yaml tab="Kubernetes IngressRoute"
    ---
    apiVersion: traefik.containo.us/v1alpha1
    kind: IngressRoute
    metadata:
      name: http-redirect-ingressroute
      namespace: admin-web
    spec:
      entryPoints:
        - web
      routes:
        - match: Host(`example.org`) && PathPrefix(`/admin`)
          kind: Rule
          services:
            - name: admin-svc
              port: admin
          middlewares:
            - name: admin-stripprefix
    ---
    apiVersion: traefik.containo.us/v1alpha1
    kind: Middleware
    metadata:
      name: admin-stripprefix
    spec:
      stripPrefix:
        prefixes:
          - /admin
    ```

    ```yaml tab="File (YAML)"
    ## Dynamic Configuration
    # dynamic-conf.yml

    # As YAML Configuration File
    http:
      routers:
        admin:
          service: admin-svc
          middlewares:
            - "admin-stripprefix"
          rule: "Host(`example.org`) && PathPrefix(`/admin`)"

      middlewares:
        admin-stripprefix:
          stripPrefix:
            prefixes:
            - "/admin"

    # ...
    ```

    ```toml tab="File (TOML)"
    ## Dynamic configuration
    # dynamic-conf.toml

    [http.routers.router1]
        rule = "Host(`example.org`) && PathPrefix(`/admin`)"
        service = "admin-svc"
        entrypoints = ["web"]
        middlewares = ["admin-stripprefix"]

    [http.middlewares]
      [http.middlewares.admin-stripprefix.stripPrefix]
      prefixes = ["/admin"]

    # ...
    ```

??? question "What About Other Path Transformations?"

    Instead of removing the path prefix with the [`stripprefix` middleware](../../middlewares/stripprefix/), you can also:

    - Add a path prefix with the [`addprefix` middleware](../../middlewares/addprefix/)
    - Replace the complete path of the request with the [`replacepath` middleware](../../middlewares/replacepath/)
    - ReplaceRewrite path using Regexp with the [`replacepathregex` middleware](../../middlewares/replacepathregex/)
    - And a lot more on the [`middlewares` page](../../middlewares/overview/)

## ACME (LetsEncrypt)

[ACME](../https/acme.md) is now a certificate resolver (under a certificatesResolvers section) but remains in the static configuration.

!!! example "ACME from provider to a specific Certificate Resolver"

    !!! info "v1"

    ```toml tab="File (TOML)"
    # static configuration
    defaultEntryPoints = ["websecure","web"]

    [entryPoints.web]
    address = ":80"
      [entryPoints.web.redirect]
      entryPoint = "webs"
    [entryPoints.websecure]
      address = ":443"
      [entryPoints.websecure.tls]

    [acme]
      email = "your-email-here@example.com"
      storage = "acme.json"
      entryPoint = "websecure"
      onHostRule = true
      [acme.tlsChallenge]
    ```

    ```bash tab="CLI"
    --defaultentrypoints=websecure,web
    --entryPoints=Name:web Address::80 Redirect.EntryPoint:websecure
    --entryPoints=Name:websecure Address::443 TLS
    --acme.email=your-email-here@example.com
    --acme.storage=acme.json
    --acme.entryPoint=websecure
    --acme.onHostRule=true
    --acme.tlschallenge=true
    ```

    !!! info "v2"

    ```yaml tab="File (YAML)"
    entryPoints:
      web:
        address: ":80"

      websecure:
        address: ":443"
        http:
          tls:
            certResolver: myresolver

    certificatesResolvers:
      myresolver:
        acme:
          email: your-email@example.com
          storage: acme.json
          tlsChallenge: {}
    ```

    ```toml tab="File (TOML)"
    # static configuration
    [entryPoints]
      [entryPoints.web]
        address = ":80"

      [entryPoints.websecure]
        address = ":443"
      [entryPoints.websecure.http.tls]
        certResolver = "myresolver"

    [certificatesResolvers.myresolver.acme]
      email = "your-email@example.com"
      storage = "acme.json"
      [certificatesResolvers.myresolver.acme.tlsChallenge]
    ```

    ```bash tab="CLI"
    --entrypoints.web.address=:80
    --entrypoints.websecure.address=:443
    --certificatesresolvers.myresolver.acme.email=your-email@example.com
    --certificatesresolvers.myresolver.acme.storage=acme.json
    --certificatesresolvers.myresolver.acme.tlschallenge=true
    ```

## Traefik Logs

In the v2, all the [log configuration](../observability/logs.md) remains in the static part but are unified under a `log` section.
There is no more log configuration at the root level.

!!! example "Simple log configuration"

    !!! info "v1"

    ```toml tab="File (TOML)"
    # static configuration
    logLevel = "DEBUG"

    [traefikLog]
      filePath = "/path/to/traefik.log"
      format   = "json"
    ```

    ```bash tab="CLI"
    --logLevel=DEBUG
    --traefikLog.filePath=/path/to/traefik.log
    --traefikLog.format=json
    ```

    !!! info "v2"

    ```yaml tab="File (YAML)"
    # static configuration
    log:
      level: DEBUG
      filePath: /path/to/log-file.log
      format: json
    ```

    ```toml tab="File (TOML)"
    # static configuration
    [log]
      level = "DEBUG"
      filePath = "/path/to/log-file.log"
      format = "json"
    ```

    ```bash tab="CLI"
    --log.level=DEBUG
    --log.filePath=/path/to/traefik.log
    --log.format=json
    ```

## Access Logs

Access Logs are configured in the same way as before.

But all request headers are now filtered out by default in Traefik v2.
So during migration, you might want to consider enabling some needed fields (see [access log configuration](../observability/access-logs.md)).

## Tracing

Traefik v2 retains OpenTracing support. The `backend` root option from the v1 is gone, you just have to set your [tracing configuration](../observability/tracing/overview.md).

!!! example "Simple Jaeger tracing configuration"

    !!! info "v1"

    ```toml tab="File (TOML)"
    # static configuration
    [tracing]
      backend = "jaeger"
      servicename = "tracing"
      [tracing.jaeger]
        samplingParam = 1.0
        samplingServerURL = "http://12.0.0.1:5778/sampling"
        samplingType = "const"
        localAgentHostPort = "12.0.0.1:6831"
    ```

    ```bash tab="CLI"
    --tracing.backend=jaeger
    --tracing.servicename=tracing
    --tracing.jaeger.localagenthostport=12.0.0.1:6831
    --tracing.jaeger.samplingparam=1.0
    --tracing.jaeger.samplingserverurl=http://12.0.0.1:5778/sampling
    --tracing.jaeger.samplingtype=const
    ```

    !!! info "v2"

    ```yaml tab="File (YAML)"
    # static configuration
    tracing:
      servicename: tracing
      jaeger:
        samplingParam: 1
        samplingServerURL: 'http://12.0.0.1:5778/sampling'
        samplingType: const
        localAgentHostPort: '12.0.0.1:6831'
    ```

    ```toml tab="File (TOML)"
    # static configuration
    [tracing]
      servicename = "tracing"
      [tracing.jaeger]
        samplingParam = 1.0
        samplingServerURL = "http://12.0.0.1:5778/sampling"
        samplingType = "const"
        localAgentHostPort = "12.0.0.1:6831"
    ```

    ```bash tab="CLI"
    --tracing.servicename=tracing
    --tracing.jaeger.localagenthostport=12.0.0.1:6831
    --tracing.jaeger.samplingparam=1.0
    --tracing.jaeger.samplingserverurl=http://12.0.0.1:5778/sampling
    --tracing.jaeger.samplingtype=const
    ```

## Metrics

The v2 retains metrics tools and allows metrics to be configured for the entrypoints and/or services.
For a basic configuration, the [metrics configuration](../observability/metrics/overview.md) remains the same.

!!! example "Simple Prometheus metrics configuration"

    !!! info "v1"

    ```toml tab="File (TOML)"
    # static configuration
    [metrics.prometheus]
      buckets = [0.1,0.3,1.2,5.0]
      entryPoint = "traefik"
    ```

    ```bash tab="CLI"
    --metrics.prometheus.buckets=[0.1,0.3,1.2,5.0]
    --metrics.prometheus.entrypoint=traefik
    ```

    !!! info "v2"

    ```yaml tab="File (YAML)"
    # static configuration
    metrics:
      prometheus:
        buckets:
          - 0.1
          - 0.3
          - 1.2
          - 5
        entryPoint: metrics
    ```

    ```toml tab="File (TOML)"
    # static configuration
    [metrics.prometheus]
      buckets = [0.1,0.3,1.2,5.0]
      entryPoint = "metrics"
    ```

    ```bash tab="CLI"
    --metrics.prometheus.buckets=[0.1,0.3,1.2,5.0]
    --metrics.prometheus.entrypoint=metrics
    ```

## No More Root Level Key/Values

To avoid any source of confusion, there are no more configuration at the root level.
Each root item has been moved to a related section or removed.

!!! example "From root to dedicated section"

    !!! info "v1"

    ```toml tab="File (TOML)"
    # static configuration
    checkNewVersion = false
    sendAnonymousUsage = true
    logLevel = "DEBUG"
    insecureSkipVerify = true
    rootCAs = [ "/mycert.cert" ]
    maxIdleConnsPerHost = 200
    providersThrottleDuration = "2s"
    AllowMinWeightZero = true
    debug = true
    defaultEntryPoints = ["web", "websecure"]
    keepTrailingSlash = false
    ```

    ```bash tab="CLI"
    --checknewversion=false
    --sendanonymoususage=true
    --loglevel=DEBUG
    --insecureskipverify=true
    --rootcas=/mycert.cert
    --maxidleconnsperhost=200
    --providersthrottleduration=2s
    --allowminweightzero=true
    --debug=true
    --defaultentrypoints=web,websecure
    --keeptrailingslash=true
    ```

    !!! info "v2"

    ```yaml tab="File (YAML)"
    # static configuration
    global:
      checkNewVersion: true
      sendAnonymousUsage: true

    log:
      level: DEBUG

    serversTransport:
      insecureSkipVerify: true
      rootCAs:
        - /mycert.cert
      maxIdleConnsPerHost: 42

    providers:
      providersThrottleDuration: 42
    ```

    ```toml tab="File (TOML)"
    # static configuration
    [global]
      checkNewVersion = true
      sendAnonymousUsage = true

    [log]
      level = "DEBUG"

    [serversTransport]
      insecureSkipVerify = true
      rootCAs = [ "/mycert.cert" ]
      maxIdleConnsPerHost = 42

    [providers]
      providersThrottleDuration = 42
    ```

    ```bash tab="CLI"
    --global.checknewversion=true
    --global.sendanonymoususage=true
    --log.level=DEBUG
    --serverstransport.insecureskipverify=true
    --serverstransport.rootcas=/mycert.cert
    --serverstransport.maxidleconnsperhost=42
    --providers.providersthrottleduration=42
    ```

## Dashboard

You need to activate the API to access the [dashboard](../operations/dashboard.md).

To activate the dashboard, you can either:

- use the [secure mode](../operations/dashboard.md#secure-mode) with the `api@internal` service like in the following examples
- or use the [insecure mode](../operations/api.md#insecure)

!!! example "Activate and access the dashboard"

    !!! info "v1"

    ```toml tab="File (TOML)"
    ## static configuration
    # traefik.toml

    [entryPoints.websecure]
      address = ":443"
      [entryPoints.websecure.tls]
      [entryPoints.websecure.auth]
        [entryPoints.websecure.auth.basic]
          users = [
            "test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/"
          ]

    [api]
      entryPoint = "websecure"
    ```

    ```bash tab="CLI"
    --entryPoints='Name:websecure Address::443 TLS Auth.Basic.Users:test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/'
    --api
    ```

    !!! info "v2"

    ```yaml tab="Docker"
    # dynamic configuration
    labels:
      - "traefik.http.routers.api.rule=Host(`traefik.docker.localhost`)"
      - "traefik.http.routers.api.entrypoints=websecure"
      - "traefik.http.routers.api.service=api@internal"
      - "traefik.http.routers.api.middlewares=myAuth"
      - "traefik.http.routers.api.tls"
      - "traefik.http.middlewares.myAuth.basicauth.users=test:$$apr1$$H6uskkkW$$IgXLP6ewTrSuBkTrqE8wj/"
    ```

    ```yaml tab="File (YAML)"
    ## static configuration
    # traefik.yml

    entryPoints:
      websecure:
        address: ':443'

    api: {}

    providers:
      file:
        directory: /path/to/dynamic/config

    ##---------------------##

    ## dynamic configuration
    # /path/to/dynamic/config/dynamic-conf.yml

     http:
      routers:
        api:
          rule: Host(`traefik.docker.localhost`)
          entrypoints:
            - websecure
          service: api@internal
          middlewares:
            - myAuth
          tls: {}

      middlewares:
        myAuth:
          basicAuth:
            users:
              - 'test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/'
    ```

    ```toml tab="File (TOML)"
    ## static configuration
    # traefik.toml

    [entryPoints.websecure]
      address = ":443"

    [api]

    [providers.file]
      directory = "/path/to/dynamic/config"

    ##---------------------##

    ## dynamic configuration
    # /path/to/dynamic/config/dynamic-conf.toml

    [http.routers.api]
      rule = "Host(`traefik.docker.localhost`)"
      entrypoints = ["websecure"]
      service = "api@internal"
      middlewares = ["myAuth"]
      [http.routers.api.tls]

    [http.middlewares.myAuth.basicAuth]
      users = [
        "test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/"
      ]
    ```

## Providers

Supported [providers](../providers/overview.md), for now:

- [ ] Azure Service Fabric
- [x] Consul
- [x] Consul Catalog
- [x] Docker
- [ ] DynamoDB
- [ ] ECS
- [x] Etcd
- [ ] Eureka
- [x] File
- [x] Kubernetes Ingress
- [x] Kubernetes IngressRoute
- [x] Marathon
- [ ] Mesos
- [x] Rancher
- [x] Redis
- [x] Rest
- [x] Zookeeper

## Some Tips You Should Know

- Different sources of static configuration (file, CLI flags, ...) cannot be [mixed](../getting-started/configuration-overview.md#the-static-configuration).
- Now, configuration elements can be referenced between different providers by using the provider namespace notation: `@<provider>`.
  For instance, a router named `myrouter` in a File Provider can refer to a service named `myservice` defined in Docker Provider with the following notation: `myservice@docker`.
- Middlewares are applied in the same order as their declaration in router.
- If you have any questions feel free to join our [community forum](https://community.traefik.io).