traefik/docs/content/routing/providers/docker.md

title	description
Traefik Docker Routing Documentation	This guide will teach you how to attach labels to your containers, to route traffic and load balance with Traefik and Docker.

Traefik & Docker

A Story of Labels & Containers {: .subtitle }

Attach labels to your containers and let Traefik do the rest!

Configuration Examples

??? example "Configuring Docker & Deploying / Exposing Services"

Enabling the docker provider

```yaml tab="File (YAML)"
providers:
  docker: {}
```

```toml tab="File (TOML)"
[providers.docker]
```

```bash tab="CLI"
--providers.docker=true
```

Attaching labels to containers (in your docker compose file)

```yaml
version: "3"
services:
  my-container:
    # ...
    labels:
      - traefik.http.routers.my-container.rule=Host(`example.com`)
```

??? example "Specify a Custom Port for the Container"

Forward requests for `http://example.com` to `http://<private IP of container>:12345`:

```yaml
version: "3"
services:
  my-container:
    # ...
    labels:
      - traefik.http.routers.my-container.rule=Host(`example.com`)
      # Tell Traefik to use the port 12345 to connect to `my-container`
      - traefik.http.services.my-service.loadbalancer.server.port=12345
```

!!! important "Traefik Connecting to the Wrong Port: `HTTP/502 Gateway Error`"
    By default, Traefik uses the first exposed port of a container.

    Setting the label `traefik.http.services.xxx.loadbalancer.server.port`
    overrides that behavior.

??? example "Specifying more than one router and service per container"

Forwarding requests to more than one port on a container requires referencing the service loadbalancer port definition using the service parameter on the router.

In this example, requests are forwarded for `http://example-a.com` to `http://<private IP of container>:8000` in addition to `http://example-b.com` forwarding to `http://<private IP of container>:9000`:

```yaml
version: "3"
services:
  my-container:
    # ...
    labels:
      - traefik.http.routers.www-router.rule=Host(`example-a.com`)
      - traefik.http.routers.www-router.service=www-service
      - traefik.http.services.www-service.loadbalancer.server.port=8000
      - traefik.http.routers.admin-router.rule=Host(`example-b.com`)
      - traefik.http.routers.admin-router.service=admin-service
      - traefik.http.services.admin-service.loadbalancer.server.port=9000
```

Routing Configuration

!!! info "Labels"

- Labels are case insensitive.
- The complete list of labels can be found in [the reference page](../../reference/dynamic-configuration/docker.md).

General

Traefik creates, for each container, a corresponding service and router.

The Service automatically gets a server per instance of the container, and the router automatically gets a rule defined by defaultRule (if no rule for it was defined in labels).

Service definition

--8<-- "content/routing/providers/service-by-label.md"

??? example "Automatic service assignment with labels"

With labels in a compose file

```yaml
labels:
  - "traefik.http.routers.myproxy.rule=Host(`example.net`)"
  # service myservice gets automatically assigned to router myproxy
  - "traefik.http.services.myservice.loadbalancer.server.port=80"
```

??? example "Automatic service creation and assignment with labels"

With labels in a compose file

```yaml
labels:
  # no service specified or defined and yet one gets automatically created
  # and assigned to router myproxy.
  - "traefik.http.routers.myproxy.rule=Host(`example.net`)"
```

Routers

To update the configuration of the Router automatically attached to the container, add labels starting with traefik.http.routers.<name-of-your-choice>. and followed by the option you want to change.

For example, to change the rule, you could add the label traefik.http.routers.my-container.rule=Host(`example.com`).

!!! warning "The character @ is not authorized in the router name <router_name>."

??? info "traefik.http.routers.<router_name>.rule"

See [rule](../routers/index.md#rule) for more information.

```yaml
- "traefik.http.routers.myrouter.rule=Host(`example.com`)"
```

??? info "traefik.http.routers.<router_name>.entrypoints"

See [entry points](../routers/index.md#entrypoints) for more information.

```yaml
- "traefik.http.routers.myrouter.entrypoints=ep1,ep2"
```

??? info "traefik.http.routers.<router_name>.middlewares"

See [middlewares](../routers/index.md#middlewares) and [middlewares overview](../../middlewares/overview.md) for more information.

```yaml
- "traefik.http.routers.myrouter.middlewares=auth,prefix,cb"
```

??? info "traefik.http.routers.<router_name>.service"

See [service](../routers/index.md#service) for more information.

```yaml
- "traefik.http.routers.myrouter.service=myservice"
```

??? info "traefik.http.routers.<router_name>.tls"

See [tls](../routers/index.md#tls) for more information.

```yaml
- "traefik.http.routers.myrouter.tls=true"
```

??? info "traefik.http.routers.<router_name>.tls.certresolver"

See [certResolver](../routers/index.md#certresolver) for more information.

```yaml
- "traefik.http.routers.myrouter.tls.certresolver=myresolver"
```

??? info "traefik.http.routers.<router_name>.tls.domains[n].main"

See [domains](../routers/index.md#domains) for more information.

```yaml
- "traefik.http.routers.myrouter.tls.domains[0].main=example.org"
```

??? info "traefik.http.routers.<router_name>.tls.domains[n].sans"

See [domains](../routers/index.md#domains) for more information.

```yaml
- "traefik.http.routers.myrouter.tls.domains[0].sans=test.example.org,dev.example.org"
```

??? info "traefik.http.routers.<router_name>.tls.options"

See [options](../routers/index.md#options) for more information.

```yaml
- "traefik.http.routers.myrouter.tls.options=foobar"
```

??? info "traefik.http.routers.<router_name>.priority"

See [priority](../routers/index.md#priority) for more information.

```yaml
- "traefik.http.routers.myrouter.priority=42"
```

Services

To update the configuration of the Service automatically attached to the container, add labels starting with traefik.http.services.<name-of-your-choice>., followed by the option you want to change.

For example, to change the passHostHeader behavior, you'd add the label traefik.http.services.<name-of-your-choice>.loadbalancer.passhostheader=false.

!!! warning "The character @ is not authorized in the service name <service_name>."

??? info "traefik.http.services.<service_name>.loadbalancer.server.port"

Registers a port.
Useful when the container exposes multiples ports.

```yaml
- "traefik.http.services.myservice.loadbalancer.server.port=8080"
```

??? info "traefik.http.services.<service_name>.loadbalancer.server.scheme"

Overrides the default scheme.

```yaml
- "traefik.http.services.myservice.loadbalancer.server.scheme=http"
```

??? info "traefik.http.services.<service_name>.loadbalancer.serverstransport"

Allows to reference a ServersTransport resource that is defined either with the File provider or the Kubernetes CRD one.
See [serverstransport](../services/index.md#serverstransport) for more information.

```yaml
- "traefik.http.services.<service_name>.loadbalancer.serverstransport=foobar@file"
```

??? info "traefik.http.services.<service_name>.loadbalancer.passhostheader"

See [pass Host header](../services/index.md#pass-host-header) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.passhostheader=true"
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.headers.<header_name>"

See [health check](../services/index.md#health-check) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.healthcheck.headers.X-Foo=foobar"
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.hostname"

See [health check](../services/index.md#health-check) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.healthcheck.hostname=example.org"
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.interval"

See [health check](../services/index.md#health-check) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.healthcheck.interval=10s"
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.path"

See [health check](../services/index.md#health-check) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.healthcheck.path=/foo"
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.method"

See [health check](../services/index.md#health-check) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.healthcheck.method=foobar"
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.status"

See [health check](../services/index.md#health-check) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.healthcheck.status=42"
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.port"

See [health check](../services/index.md#health-check) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.healthcheck.port=42"
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.scheme"

See [health check](../services/index.md#health-check) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.healthcheck.scheme=http"
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.timeout"

See [health check](../services/index.md#health-check) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.healthcheck.timeout=10s"
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.followredirects"

See [health check](../services/index.md#health-check) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.healthcheck.followredirects=true"
```

??? info "traefik.http.services.<service_name>.loadbalancer.sticky.cookie"

See [sticky sessions](../services/index.md#sticky-sessions) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.sticky.cookie=true"
```

??? info "traefik.http.services.<service_name>.loadbalancer.sticky.cookie.httponly"

See [sticky sessions](../services/index.md#sticky-sessions) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.sticky.cookie.httponly=true"
```

??? info "traefik.http.services.<service_name>.loadbalancer.sticky.cookie.name"

See [sticky sessions](../services/index.md#sticky-sessions) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.sticky.cookie.name=foobar"
```

??? info "traefik.http.services.<service_name>.loadbalancer.sticky.cookie.secure"

See [sticky sessions](../services/index.md#sticky-sessions) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.sticky.cookie.secure=true"
```

??? info "traefik.http.services.<service_name>.loadbalancer.sticky.cookie.samesite"

See [sticky sessions](../services/index.md#sticky-sessions) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.sticky.cookie.samesite=none"
```

??? info "traefik.http.services.<service_name>.loadbalancer.responseforwarding.flushinterval"

See [response forwarding](../services/index.md#response-forwarding) for more information.

```yaml
- "traefik.http.services.myservice.loadbalancer.responseforwarding.flushinterval=10"
```

Middleware

You can declare pieces of middleware using labels starting with traefik.http.middlewares.<name-of-your-choice>., followed by the middleware type/options.

For example, to declare a middleware redirectscheme named my-redirect, you'd write traefik.http.middlewares.my-redirect.redirectscheme.scheme=https.

More information about available middlewares in the dedicated middlewares section.

!!! warning "The character @ is not authorized in the middleware name."

??? example "Declaring and Referencing a Middleware"

```yaml
   services:
     my-container:
       # ...
       labels:
         # Declaring a middleware
         - traefik.http.middlewares.my-redirect.redirectscheme.scheme=https
         # Referencing a middleware
         - traefik.http.routers.my-container.middlewares=my-redirect
```

!!! warning "Conflicts in Declaration"

If you declare multiple middleware with the same name but with different parameters, the middleware fails to be declared.

TCP

You can declare TCP Routers and/or Services using labels.

??? example "Declaring TCP Routers and Services"

```yaml
   services:
     my-container:
       # ...
       labels:
         - "traefik.tcp.routers.my-router.rule=HostSNI(`example.com`)"
         - "traefik.tcp.routers.my-router.tls=true"
         - "traefik.tcp.services.my-service.loadbalancer.server.port=4123"
```

!!! warning "TCP and HTTP"

If you declare a TCP Router/Service, it will prevent Traefik from automatically creating an HTTP Router/Service (like it does by default if no TCP Router/Service is defined).
You can declare both a TCP Router/Service and an HTTP Router/Service for the same container (but you have to do so manually).

TCP Routers

??? info "traefik.tcp.routers.<router_name>.entrypoints"

See [entry points](../routers/index.md#entrypoints_1) for more information.

```yaml
- "traefik.tcp.routers.mytcprouter.entrypoints=ep1,ep2"
```

??? info "traefik.tcp.routers.<router_name>.rule"

See [rule](../routers/index.md#rule_1) for more information.

```yaml
- "traefik.tcp.routers.mytcprouter.rule=HostSNI(`example.com`)"
```

??? info "traefik.tcp.routers.<router_name>.service"

See [service](../routers/index.md#services) for more information.

```yaml
- "traefik.tcp.routers.mytcprouter.service=myservice"
```

??? info "traefik.tcp.routers.<router_name>.tls"

See [TLS](../routers/index.md#tls_1) for more information.

```yaml
- "traefik.tcp.routers.mytcprouter.tls=true"
```

??? info "traefik.tcp.routers.<router_name>.tls.certresolver"

See [certResolver](../routers/index.md#certresolver_1) for more information.

```yaml
- "traefik.tcp.routers.mytcprouter.tls.certresolver=myresolver"
```

??? info "traefik.tcp.routers.<router_name>.tls.domains[n].main"

See [domains](../routers/index.md#domains_1) for more information.

```yaml
- "traefik.tcp.routers.mytcprouter.tls.domains[0].main=example.org"
```

??? info "traefik.tcp.routers.<router_name>.tls.domains[n].sans"

See [domains](../routers/index.md#domains_1) for more information.

```yaml
- "traefik.tcp.routers.mytcprouter.tls.domains[0].sans=test.example.org,dev.example.org"
```

??? info "traefik.tcp.routers.<router_name>.tls.options"

See [options](../routers/index.md#options_1) for more information.

```yaml
- "traefik.tcp.routers.mytcprouter.tls.options=mysoptions"
```

??? info "traefik.tcp.routers.<router_name>.tls.passthrough"

See [TLS](../routers/index.md#tls_1) for more information.

```yaml
- "traefik.tcp.routers.mytcprouter.tls.passthrough=true"
```

??? info "traefik.tcp.routers.<router_name>.priority"

See [priority](../routers/index.md#priority_1) for more information.

```yaml
- "traefik.tcp.routers.myrouter.priority=42"
```

TCP Services

??? info "traefik.tcp.services.<service_name>.loadbalancer.server.port"

Registers a port of the application.

```yaml
- "traefik.tcp.services.mytcpservice.loadbalancer.server.port=423"
```

??? info "traefik.tcp.services.<service_name>.loadbalancer.server.tls"

Determines whether to use TLS when dialing with the backend.

```yaml
- "traefik.tcp.services.mytcpservice.loadbalancer.server.tls=true"
```

??? info "traefik.tcp.services.<service_name>.loadbalancer.proxyprotocol.version"

See [PROXY protocol](../services/index.md#proxy-protocol) for more information.

```yaml
- "traefik.tcp.services.mytcpservice.loadbalancer.proxyprotocol.version=1"
```

??? info "traefik.tcp.services.<service_name>.loadbalancer.serverstransport"

Allows to reference a ServersTransport resource that is defined either with the File provider or the Kubernetes CRD one.
See [serverstransport](../services/index.md#serverstransport_2) for more information.

```yaml
- "traefik.tcp.services.<service_name>.loadbalancer.serverstransport=foobar@file"
```

UDP

You can declare UDP Routers and/or Services using labels.

??? example "Declaring UDP Routers and Services"

```yaml
   services:
     my-container:
       # ...
       labels:
         - "traefik.udp.routers.my-router.entrypoints=udp"
         - "traefik.udp.services.my-service.loadbalancer.server.port=4123"
```

!!! warning "UDP and HTTP"

If you declare a UDP Router/Service, it will prevent Traefik from automatically creating an HTTP Router/Service (like it does by default if no UDP Router/Service is defined).
You can declare both a UDP Router/Service and an HTTP Router/Service for the same container (but you have to do so manually).

UDP Routers

??? info "traefik.udp.routers.<router_name>.entrypoints"

See [entry points](../routers/index.md#entrypoints_2) for more information.

```yaml
- "traefik.udp.routers.myudprouter.entrypoints=ep1,ep2"
```

??? info "traefik.udp.routers.<router_name>.service"

See [service](../routers/index.md#services_1) for more information.

```yaml
- "traefik.udp.routers.myudprouter.service=myservice"
```

UDP Services

??? info "traefik.udp.services.<service_name>.loadbalancer.server.port"

Registers a port of the application.

```yaml
- "traefik.udp.services.myudpservice.loadbalancer.server.port=423"
```

Specific Provider Options

traefik.enable

- "traefik.enable=true"

You can tell Traefik to consider (or not) the container by setting traefik.enable to true or false.

This option overrides the value of exposedByDefault.

traefik.docker.network

- "traefik.docker.network=mynetwork"

Overrides the default docker network to use for connections to the container.

If a container is linked to several networks, be sure to set the proper network name (you can check this with docker inspect <container_id>), otherwise it will randomly pick one (depending on how docker is returning them).

!!! warning When deploying a stack from a compose file stack, the networks defined are prefixed with stack.