# File Backends

Træfik can be configured with a file.

## Reference

```toml
[file]

# Backends
[backends]

  [backends.backend1]

    [backends.backend1.servers]
      [backends.backend1.servers.server0]
        url = "http://10.10.10.1:80"
        weight = 1
      [backends.backend1.servers.server1]
        url = "http://10.10.10.2:80"
        weight = 2
      # ...

    [backends.backend1.circuitBreaker]
      expression = "NetworkErrorRatio() > 0.5"

    [backends.backend1.loadBalancer]
      method = "drr"
      [backends.backend1.loadBalancer.stickiness]
        cookieName = "foobar"

    [backends.backend1.maxConn]
      amount = 10
      extractorfunc = "request.host"

    [backends.backend1.healthCheck]
      path = "/health"
      port = 88
      interval = "30s"

  [backends.backend2]
    # ...

# Frontends
[frontends]

  [frontends.frontend1]
    entryPoints = ["http", "https"]
    backend = "backend1"
    passHostHeader = true
    passTLSCert = true
    priority = 42
    basicAuth = [
      "test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/",
      "test2:$apr1$d9hr9HBB$4HxwgUir3HP4EsggP/QNo0",
    ]
    whitelistSourceRange = ["10.42.0.0/16", "152.89.1.33/32", "afed:be44::/16"]

    [frontends.frontend1.routes]
      [frontends.frontend1.routes.route0]
        rule = "Host:test.localhost"
      [frontends.frontend1.routes.Route1]
        rule = "Method:GET"
      # ...

    [frontends.frontend1.headers]
      allowedHosts = ["foobar", "foobar"]
      hostsProxyHeaders = ["foobar", "foobar"]
      SSLRedirect = true
      SSLTemporaryRedirect = true
      SSLHost = "foobar"
      STSSeconds = 42
      STSIncludeSubdomains = true
      STSPreload = true
      forceSTSHeader = true
      frameDeny = true
      customFrameOptionsValue = "foobar"
      contentTypeNosniff = true
      browserXSSFilter = true
      contentSecurityPolicy = "foobar"
      publicKey = "foobar"
      referrerPolicy = "foobar"
      isDevelopment = true
      [frontends.frontend1.headers.customRequestHeaders]
        X-Foo-Bar-01 = "foobar"
        X-Foo-Bar-02 = "foobar"
        # ...
      [frontends.frontend1.headers.customResponseHeaders]
        X-Foo-Bar-03 = "foobar"
        X-Foo-Bar-04 = "foobar"
        # ...
      [frontends.frontend1.headers.SSLProxyHeaders]
        X-Foo-Bar-05 = "foobar"
        X-Foo-Bar-06 = "foobar"
        # ...

    [frontends.frontend1.errors]
      [frontends.frontend1.errors.errorPage0]
        status = ["500-599"]
        backend = "error"
        query = "/{status}.html"
      [frontends.frontend1.errors.errorPage1]
        status = ["404", "403"]
        backend = "error"
        query = "/{status}.html"
      # ...

    [frontends.frontend1.ratelimit]
      extractorfunc = "client.ip"
        [frontends.frontend1.ratelimit.rateset.rateset1]
          period = "10s"
          average = 100
          burst = 200
        [frontends.frontend1.ratelimit.rateset.rateset2]
          period = "3s"
          average = 5
          burst = 10
        # ...

    [frontends.frontend1.redirect]
      entryPoint = "https"
      regex = "^http://localhost/(.*)"
      replacement = "http://mydomain/$1"

  [frontends.frontend2]
    # ...

# HTTPS certificates
[[tls]]
  entryPoints = ["https"]
  [tls.certificate]
    certFile = "path/to/my.cert"
    keyFile = "path/to/my.key"

[[tls]]
  # ...
```

## Configuration mode

You have three choices:

- [Simple](/configuration/backends/file/#simple)
- [Rules in a Separate File](/configuration/backends/file/#rules-in-a-separate-file)
- [Multiple `.toml` Files](/configuration/backends/file/#multiple-toml-files)

To enable the file backend, you must either pass the `--file` option to the Træfik binary or put the `[file]` section (with or without inner settings) in the configuration file.

The configuration file allows managing both backends/frontends and HTTPS certificates (which are not [Let's Encrypt](https://letsencrypt.org) certificates generated through Træfik).

### Simple

Add your configuration at the end of the global configuration file `traefik.toml`:

```toml
defaultEntryPoints = ["http", "https"]

[entryPoints]
  [entryPoints.http]
    # ...
  [entryPoints.https]
    # ...

[file]

# rules
[backends]
  [backends.backend1]
    # ...
  [backends.backend2]
    # ...

[frontends]
  [frontends.frontend1]
  # ...
  [frontends.frontend2]
  # ...
  [frontends.frontend3]
  # ...

# HTTPS certificate
[[tls]]
  # ...

[[tls]]
  # ...
```

!!! note
    adding certificates directly to the entrypoint is still maintained but certificates declared in this way cannot be managed dynamically.
    It's recommended to use the file provider to declare certificates.

### Rules in a Separate File

Put your rules in a separate file, for example `rules.toml`:

```toml
# traefik.toml
defaultEntryPoints = ["http", "https"]

[entryPoints]
  [entryPoints.http]
    # ...
  [entryPoints.https]
    # ...

[file]
  filename = "rules.toml"
```

```toml
# rules.toml
[backends]
  [backends.backend1]
    # ...
  [backends.backend2]
    # ...

[frontends]
  [frontends.frontend1]
  # ...
  [frontends.frontend2]
  # ...
  [frontends.frontend3]
  # ...

# HTTPS certificate
[[tls]]
  # ...

[[tls]]
  # ...
```

### Multiple `.toml` Files

You could have multiple `.toml` files in a directory (and recursively in its sub-directories):

```toml
[file]
  directory = "/path/to/config/"
```

If you want Træfik to watch file changes automatically, just add:

```toml
[file]
  watch = true
```