# Service Fabric Backend

Træfik can be configured to use Service Fabric as a backend configuration.

See [this repository for an example deployment package and further documentation.](https://aka.ms/traefikonsf)

## Service Fabric

```toml
################################################################
# Service Fabric provider
################################################################

# Enable Service Fabric configuration backend
[serviceFabric]

# Service Fabric Management Endpoint
#
# Required
#
clusterManagementUrl = "https://localhost:19080"

# Service Fabric Management Endpoint API Version
#
# Required
# Default: "3.0"
#
apiVersion = "3.0"

# Service Fabric Polling Interval (in seconds)
#
# Required
# Default: 10
#
refreshSeconds = 10

# Enable TLS connection.
#
# Optional
#
# [serviceFabric.tls]
#   ca = "/etc/ssl/ca.crt"
#   cert = "/etc/ssl/servicefabric.crt"
#   key = "/etc/ssl/servicefabric.key"
#   insecureskipverify = true
```

## Labels

The provider uses labels to configure how services are exposed through Træfik.
These can be set using Extensions and the Property Manager API

#### Extensions

Set labels with extensions through the services `ServiceManifest.xml` file.
Here is an example of an extension setting Træfik labels:

```xml
<StatelessServiceType ServiceTypeName="WebServiceType">
  <Extensions>
      <Extension Name="Traefik">
        <Labels xmlns="http://schemas.microsoft.com/2015/03/fabact-no-schema">
          <Label Key="traefik.frontend.rule.example2">PathPrefixStrip: /a/path/to/strip</Label>
          <Label Key="traefik.expose">true</Label>
          <Label Key="traefik.frontend.passHostHeader">true</Label>
        </Labels>
      </Extension>
  </Extensions>
</StatelessServiceType>
```

#### Property Manager 

Set Labels with the property manager API to overwrite and add labels, while your service is running.
Here is an example of adding a frontend rule using the property manager API. 

```shell
curl -X PUT \
  'http://localhost:19080/Names/GettingStartedApplication2/WebService/$/GetProperty?api-version=6.0&IncludeValues=true' \
  -d '{
  "PropertyName": "traefik.frontend.rule.default",
  "Value": {
    "Kind": "String",
    "Data": "PathPrefixStrip: /a/path/to/strip"
  },
  "CustomTypeId": "LabelType"
}'
```

!!! note
    This functionality will be released in a future version of the [sfctl](https://docs.microsoft.com/en-us/azure/service-fabric/service-fabric-application-lifecycle-sfctl) tool.

## Available Labels

Labels, set through extensions or the property manager, can be used on services to override default behaviour.

| Label                                                     | Description                                                                                                                                                                                                            |
|-----------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `traefik.backend.maxconn.amount=10`                       | Set a maximum number of connections to the backend.<br>Must be used in conjunction with the below label to take effect.                                                                                                   |
| `traefik.backend.maxconn.extractorfunc=client.ip`         | Set the function to be used against the request to determine what to limit maximum connections to the backend by.<br>Must be used in conjunction with the above label to take effect.                                  |
| `traefik.backend.loadbalancer.method=drr`                 | Override the default `wrr` load balancer algorithm                                                                                                                                                                     |
| `traefik.backend.loadbalancer.stickiness=true`            | Enable backend sticky sessions                                                                                                                                                                                         |
| `traefik.backend.loadbalancer.stickiness.cookieName=NAME` | Manually set the cookie name for sticky sessions                                                                                                                                                                       |
| `traefik.backend.circuitbreaker.expression=EXPR`          | Create a [circuit breaker](/basics/#backends) to be used against the backend                                                                                                                                           |
| `traefik.backend.weight=10`                               | Assign this weight to the container                                                                                                                                                                                    |
| `traefik.expose=true`                                     | Expose this service using træfik                                                                                                                                                                                      |
| `traefik.frontend.rule=EXPR`                              | Override the default frontend rule. Defaults to SF address.                                                                                                                                                            |
| `traefik.frontend.passHostHeader=true`                    | Forward client `Host` header to the backend.                                                                                                                                                                           |
| `traefik.frontend.priority=10`                            | Override default frontend priority                                                                                                                                                                                     |
| `traefik.frontend.entryPoints=http,https`                 | Assign this frontend to entry points `http` and `https`. Overrides `defaultEntryPoints`                                                                                                                                |
| `traefik.frontend.auth.basic=EXPR`                        | Set basic authentication for that frontend in CSV format: `User:Hash,User:Hash`                                                                                                                                       |
| `traefik.frontend.whitelistSourceRange:RANGE`             | List of IP-Ranges which are allowed to access. An unset or empty list allows all Source-IPs to access.<br>If one of the Net-Specifications are invalid, the whole list is invalid and allows all Source-IPs to access. |
| `traefik.backend.group.name`                              | Group all services with the same name into a single backend in Træfik                                                                                                                                                |
| `traefik.backend.group.weight`                            | Set the weighting of the current services nodes in the backend group                                                                                                                                                  |