traefik/docs/configuration/backends/rancher.md

Rancher Backend

Træfik can be configured to use Rancher as a backend configuration.

Global Configuration

################################################################
# 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.

Rancher Metadata Service

# 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

# 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.enable=false	Disable this container in Træfik
traefik.port=80	Register this port. Useful when the container exposes multiples ports.
traefik.protocol=https	Override the default http protocol
traefik.weight=10	Assign this weight to the container
traefik.backend=foo	Give the name foo to the generated backend for this container.
traefik.backend.circuitbreaker.expression=EXPR	Create a circuit breaker to be used against the backend
traefik.backend.healthcheck.path=/health	Enable health check for the backend, hitting the container at path.
traefik.backend.healthcheck.port=8080	Allow to use a different port for the health check.
traefik.backend.healthcheck.interval=1s	Define the health check interval.
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)
traefik.backend.loadbalancer.swarm=true	Use Swarm's inbuilt load balancer (only relevant under Swarm Mode).
traefik.backend.maxconn.amount=10	Set a maximum number of connections to the backend. 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. Must be used in conjunction with the above label to take effect.
traefik.frontend.auth.basic=EXPR	Sets basic authentication for that frontend in CSV format: User:Hash,User:Hash
traefik.frontend.entryPoints=http,https	Assign this frontend to entry points http and https. Overrides defaultEntryPoints
traefik.frontend.errors.<name>.backend=NAME	See custom error pages section.
traefik.frontend.errors.<name>.query=PATH	See custom error pages section.
traefik.frontend.errors.<name>.status=RANGE	See custom error pages section.
traefik.frontend.passHostHeader=true	Forward client Host header to the backend.
traefik.frontend.passTLSCert=true	Forward TLS Client certificates to the backend.
traefik.frontend.priority=10	Override default frontend priority
traefik.frontend.rateLimit.extractorFunc=EXP	See custom error pages section.
traefik.frontend.rateLimit.rateSet.<name>.period=6	See custom error pages section.
traefik.frontend.rateLimit.rateSet.<name>.average=6	See custom error pages section.
traefik.frontend.rateLimit.rateSet.<name>.burst=6	See custom error pages section.
traefik.frontend.redirect.entryPoint=https	Enables Redirect to another entryPoint for that frontend (e.g. HTTPS)
traefik.frontend.redirect.regex=^http://localhost/(.*)	Redirect to another URL for that frontend. Must be set with traefik.frontend.redirect.replacement.
traefik.frontend.redirect.replacement=http://mydomain/$1	Redirect to another URL for that frontend. Must be set with traefik.frontend.redirect.regex.
traefik.frontend.rule=EXPR	Override the default frontend rule. Default: Host:{service_name}.{stack_name}.{domain}.
traefik.frontend.whitelistSourceRange=RANGE	List of IP-Ranges which are allowed to access. An unset or empty list allows all Source-IPs to access. If one of the Net-Specifications are invalid, the whole list is invalid and allows all Source-IPs to access.

Security Headers

Label	Description
traefik.frontend.headers.allowedHosts=EXPR	Provides a list of allowed hosts that requests will be processed. Format: Host1,Host2
traefik.frontend.headers.customRequestHeaders=EXPR	Provides the container with custom request headers that will be appended to each request forwarded to the container. Format: HEADER:value||HEADER2:value2
traefik.frontend.headers.customResponseHeaders=EXPR	Appends the headers to each response returned by the container, before forwarding the response to the client. Format: HEADER:value||HEADER2:value2
traefik.frontend.headers.hostsProxyHeaders=EXPR	Provides a list of headers that the proxied hostname may be stored. Format: HEADER1,HEADER2
traefik.frontend.headers.SSLRedirect=true	Forces the frontend to redirect to SSL if a non-SSL request is sent.
traefik.frontend.headers.SSLTemporaryRedirect=true	Forces the frontend to redirect to SSL if a non-SSL request is sent, but by sending a 302 instead of a 301.
traefik.frontend.headers.SSLHost=HOST	This setting configures the hostname that redirects will be based on. Default is "", which is the same host as the request.
traefik.frontend.headers.SSLProxyHeaders=EXPR	Header combinations that would signify a proper SSL Request (Such as X-Forwarded-For:https). Format: HEADER:value||HEADER2:value2
traefik.frontend.headers.STSSeconds=315360000	Sets the max-age of the STS header.
traefik.frontend.headers.STSIncludeSubdomains=true	Adds the IncludeSubdomains section of the STS header.
traefik.frontend.headers.STSPreload=true	Adds the preload flag to the STS header.
traefik.frontend.headers.forceSTSHeader=false	Adds the STS header to non-SSL requests.
traefik.frontend.headers.frameDeny=false	Adds the X-Frame-Options header with the value of DENY.
traefik.frontend.headers.customFrameOptionsValue=VALUE	Overrides the X-Frame-Options header with the custom value.
traefik.frontend.headers.contentTypeNosniff=true	Adds the X-Content-Type-Options header with the value nosniff.
traefik.frontend.headers.browserXSSFilter=true	Adds the X-XSS-Protection header with the value 1; mode=block.
traefik.frontend.headers.contentSecurityPolicy=VALUE	Adds CSP Header with the custom value.
traefik.frontend.headers.publicKey=VALUE	Adds pinned HTST public key header.
traefik.frontend.headers.referrerPolicy=VALUE	Adds referrer policy header.
traefik.frontend.headers.isDevelopment=false	This will cause the AllowedHosts, SSLRedirect, and STSSeconds/STSIncludeSubdomains options to be ignored during development. When deploying to production, be sure to set this to false.