traefik/docs/configuration/backends/rancher.md

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# Rancher Backend
Træfik can be configured to use Rancher as a backend configuration.
## Global Configuration
```toml
################################################################
# Rancher configuration backend
################################################################
# Enable Rancher configuration backend.
[rancher]
# Default domain used.
# Can be overridden by setting the "traefik.domain" label on an service.
#
# Required
#
domain = "rancher.localhost"
# Enable watch Rancher changes.
#
# Optional
# Default: true
#
watch = true
# Polling interval (in seconds).
#
# Optional
# Default: 15
#
refreshSeconds = 15
# Expose Rancher services by default in Traefik.
#
# Optional
# Default: true
#
exposedByDefault = false
# Filter services with unhealthy states and inactive states.
#
# Optional
# Default: false
#
enableServiceHealthFilter = true
```
To enable constraints see [backend-specific constraints section](/configuration/commons/#backend-specific).
## Rancher Metadata Service
```toml
# Enable Rancher metadata service configuration backend instead of the API
# configuration backend.
#
# Optional
# Default: false
#
[rancher.metadata]
# Poll the Rancher metadata service for changes every `rancher.RefreshSeconds`.
# NOTE: this is less accurate than the default long polling technique which
# will provide near instantaneous updates to Traefik
#
# Optional
# Default: false
#
intervalPoll = true
# Prefix used for accessing the Rancher metadata service.
#
# Optional
# Default: "/latest"
#
prefix = "/2016-07-29"
```
## Rancher API
```toml
# Enable Rancher API configuration backend.
#
# Optional
# Default: true
#
[rancher.api]
# Endpoint to use when connecting to the Rancher API.
#
# Required
endpoint = "http://rancherserver.example.com/v1"
# AccessKey to use when connecting to the Rancher API.
#
# Required
accessKey = "XXXXXXXXXXXXXXXXXXXX"
# SecretKey to use when connecting to the Rancher API.
#
# Required
secretKey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
```
!!! note
If Traefik needs access to the Rancher API, you need to set the `endpoint`, `accesskey` and `secretkey` parameters.
To enable Traefik to fetch information about the Environment it's deployed in only, you need to create an `Environment API Key`.
This can be found within the API Key advanced options.
Add these labels to traefik docker deployment to autogenerated these values:
```
io.rancher.container.agent.role: environment
io.rancher.container.create_agent: true
```
## Labels: overriding default behaviour
Labels can be used on task containers to override default behaviour:
| Label | Description |
|-----------------------------------------------------------------------|------------------------------------------------------------------------------------------|
| `traefik.protocol=https` | Override the default `http` protocol |
| `traefik.weight=10` | Assign this weight to the container |
| `traefik.enable=false` | Disable this container in Træfik |
| `traefik.frontend.rule=Host:test.traefik.io` | Override the default frontend rule (Default: `Host:{containerName}.{domain}`). |
| `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` | Sets basic authentication for that frontend in CSV format: `User:Hash,User:Hash`. |
| `traefik.backend.circuitbreaker.expression=NetworkErrorRatio() > 0.5` | Create a [circuit breaker](/basics/#backends) to be used against the backend |
| `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.loadbalancer.sticky=true` | Enable backend sticky sessions (DEPRECATED) |