We recommend to *not* use labels to store sensitive data (certificates, credentials, etc).
Instead, we recommend to store sensitive data in a safer storage (secrets, file, etc).

Enabling the ECS provider

```yaml tab="Structured (YAML)"
providers:
  ecs: {}
```

```toml tab="Structured (TOML)"
[providers.ecs]
```

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

Attaching labels to containers (in your ECS task definition)

```json
{
  "family": "my-service",
  "containerDefinitions": [
    {
      "name": "my-container",
      "image": "my-image:latest",
      "labels": {
        "traefik.http.routers.my-container.rule": "Host(`example.com`)"
      }
    }
  ]
}
```

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

```json
{
  "family": "my-service",
  "containerDefinitions": [
    {
      "name": "my-container",
      "image": "my-image:latest",
      "labels": {
        "traefik.http.routers.my-container.rule": "Host(`example.com`)",
        "traefik.http.routers.my-container.service": "my-service",
        "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.

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`:

```json
{
  "family": "my-service",
  "containerDefinitions": [
    {
      "name": "my-container",
      "image": "my-image:latest",
      "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"
      }
    }
  ]
}
```

Labels are case-insensitive.

To learn how to configure Traefik default generated certificate, refer to the [TLS Certificates](../http/tls/tls-certificates.md#acme-default-certificate) page.

```yaml
# ...
# Declaring a middleware
traefik.http.middlewares.my-redirect.redirectscheme.scheme=https
# Referencing a middleware
traefik.http.routers.my-service.middlewares=my-redirect
```

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

```yaml
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
```

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 elastic service (but you have to do so manually).

```yaml
traefik.udp.routers.my-router.entrypoints=udp
traefik.udp.services.my-service.loadbalancer.server.port=4123
```

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 elastic service (but you have to do so manually).

```yaml
# ...
# Declaring a middleware
traefik.tcp.middlewares.test-inflightconn.amount=10
# Referencing a middleware
traefik.tcp.routers.my-service.middlewares=test-inflightconn
```

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