traefik/docs/configuration/backends/consulcatalog.md

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# Consul Catalog Provider
Træfik can be configured to use service discovery catalog of Consul as a provider.
```toml
################################################################
# Consul Catalog Provider
################################################################
# Enable Consul Catalog Provider.
[consulCatalog]
# Consul server endpoint.
#
# Required
# Default: "127.0.0.1:8500"
#
endpoint = "127.0.0.1:8500"
# Expose Consul catalog services by default in Traefik.
#
# Optional
# Default: true
#
exposedByDefault = false
# Allow Consul server to serve the catalog reads regardless of whether it is the leader.
#
# Optional
# Default: false
#
stale = false
# Default domain used.
#
# Optional
#
domain = "consul.localhost"
# Prefix for Consul catalog tags.
#
# Optional
# Default: "traefik"
#
prefix = "traefik"
# Default frontEnd Rule for Consul services.
#
# The format is a Go Template with:
# - ".ServiceName", ".Domain" and ".Attributes" available
# - "getTag(name, tags, defaultValue)", "hasTag(name, tags)" and "getAttribute(name, tags, defaultValue)" functions are available
# - "getAttribute(...)" function uses prefixed tag names based on "prefix" value
#
# Optional
# Default: "Host:{{.ServiceName}}.{{.Domain}}"
#
#frontEndRule = "Host:{{.ServiceName}}.{{.Domain}}"
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# Enable Consul catalog TLS connection.
#
# Optional
#
# [consulCatalog.tls]
# ca = "/etc/ssl/ca.crt"
# cert = "/etc/ssl/consul.crt"
# key = "/etc/ssl/consul.key"
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# insecureSkipVerify = true
# Override default configuration template.
# For advanced users :)
#
# Optional
#
# filename = "consulcatalog.tmpl"
# Override template version
# For advanced users :)
#
# Optional
# - "1": previous template version (must be used only with older custom templates, see "filename")
# - "2": current template version (must be used to force template version when "filename" is used)
#
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# templateVersion = 2
```
This provider will create routes matching on hostname based on the service name used in Consul.
To enable constraints see [provider-specific constraints section](/configuration/commons/#provider-specific).
## Tags
Additional settings can be defined using Consul Catalog tags.
!!! note
The default prefix is `traefik`.
| Label | Description |
|-------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `<prefix>.enable=false` | Disable this container in Træfik. |
| `<prefix>.protocol=https` | Override the default `http` protocol. |
| `<prefix>.weight=10` | Assign this weight to the container. |
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| `traefik.backend.buffering.maxRequestBodyBytes=0` | See [buffering](/configuration/commons/#buffering) section. |
| `traefik.backend.buffering.maxResponseBodyBytes=0` | See [buffering](/configuration/commons/#buffering) section. |
| `traefik.backend.buffering.memRequestBodyBytes=0` | See [buffering](/configuration/commons/#buffering) section. |
| `traefik.backend.buffering.memResponseBodyBytes=0` | See [buffering](/configuration/commons/#buffering) section. |
| `traefik.backend.buffering.retryExpression=EXPR` | See [buffering](/configuration/commons/#buffering) section. |
| `<prefix>.backend.circuitbreaker.expression=EXPR` | Create a [circuit breaker](/basics/#backends) to be used against the backend. ex: `NetworkErrorRatio() > 0.` |
| `<prefix>.backend.healthcheck.path=/health` | Enable health check for the backend, hitting the container at `path`. |
| `<prefix>.backend.healthcheck.interval=1s` | Define the health check interval. |
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| `<prefix>.backend.healthcheck.port=8080` | Allow to use a different port for the health check. |
| `traefik.backend.healthcheck.scheme=http` | Override the server URL scheme. |
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| `<prefix>.backend.healthcheck.hostname=foobar.com` | Define the health check hostname. |
| `<prefix>.backend.healthcheck.headers=EXPR` | Define the health check request headers <br>Format: <code>HEADER:value&vert;&vert;HEADER2:value2</code> |
| `<prefix>.backend.loadbalancer.method=drr` | Override the default `wrr` load balancer algorithm. |
| `<prefix>.backend.loadbalancer.stickiness=true` | Enable backend sticky sessions. |
| `<prefix>.backend.loadbalancer.stickiness.cookieName=NAME` | Manually set the cookie name for sticky sessions. |
| `<prefix>.backend.loadbalancer.sticky=true` | Enable backend sticky sessions. (DEPRECATED) |
| `<prefix>.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. |
| `<prefix>.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. |
| `<prefix>.frontend.auth.basic=EXPR` | Sets basic authentication for that frontend in CSV format: `User:Hash,User:Hash` |
| `<prefix>.frontend.entryPoints=http,https` | Assign this frontend to entry points `http` and `https`.<br>Overrides `defaultEntryPoints` |
| `<prefix>.frontend.errors.<name>.backend=NAME` | See [custom error pages](/configuration/commons/#custom-error-pages) section. |
| `<prefix>.frontend.errors.<name>.query=PATH` | See [custom error pages](/configuration/commons/#custom-error-pages) section. |
| `<prefix>.frontend.errors.<name>.status=RANGE` | See [custom error pages](/configuration/commons/#custom-error-pages) section. |
| `<prefix>.frontend.passHostHeader=true` | Forward client `Host` header to the backend. |
| `<prefix>.frontend.passTLSCert=true` | Forward TLS Client certificates to the backend. |
| `<prefix>.frontend.priority=10` | Override default frontend priority. |
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| `<prefix>.frontend.rateLimit.extractorFunc=EXP` | See [rate limiting](/configuration/commons/#rate-limiting) section. |
| `<prefix>.frontend.rateLimit.rateSet.<name>.period=6` | See [rate limiting](/configuration/commons/#rate-limiting) section. |
| `<prefix>.frontend.rateLimit.rateSet.<name>.average=6` | See [rate limiting](/configuration/commons/#rate-limiting) section. |
| `<prefix>.frontend.rateLimit.rateSet.<name>.burst=6` | See [rate limiting](/configuration/commons/#rate-limiting) section. |
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| `<prefix>.frontend.redirect.entryPoint=https` | Enables Redirect to another entryPoint for that frontend (e.g. HTTPS). |
| `<prefix>.frontend.redirect.regex=^http://localhost/(.*)` | Redirect to another URL for that frontend.<br>Must be set with `traefik.frontend.redirect.replacement`. |
| `<prefix>.frontend.redirect.replacement=http://mydomain/$1` | Redirect to another URL for that frontend.<br>Must be set with `traefik.frontend.redirect.regex`. |
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| `<prefix>.frontend.redirect.permanent=true` | Return 301 instead of 302. |
| `<prefix>.frontend.rule=EXPR` | Override the default frontend rule. Default: `Host:{{.ServiceName}}.{{.Domain}}`. |
| `<prefix>.frontend.whiteList.sourceRange=RANGE` | List of IP-Ranges which are allowed to access.<br>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. |
| `<prefix>.frontend.whiteList.useXForwardedFor=true` | Use `X-Forwarded-For` header as valid source of IP for the white list. |
### Custom Headers
!!! note
The default prefix is `traefik`.
| Label | Description |
|--------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `<prefix>.frontend.headers.customRequestHeaders=EXPR ` | Provides the container with custom request headers that will be appended to each request forwarded to the container.<br>Format: <code>HEADER:value&vert;&vert;HEADER2:value2</code> |
| `<prefix>.frontend.headers.customResponseHeaders=EXPR` | Appends the headers to each response returned by the container, before forwarding the response to the client.<br>Format: <code>HEADER:value&vert;&vert;HEADER2:value2</code> |
### Security Headers
!!! note
The default prefix is `traefik`.
| Label | Description |
|-----------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `<prefix>.frontend.headers.allowedHosts=EXPR` | Provides a list of allowed hosts that requests will be processed.<br>Format: `Host1,Host2` |
| `<prefix>.frontend.headers.browserXSSFilter=true` | Adds the X-XSS-Protection header with the value `1; mode=block`. |
| `<prefix>.frontend.headers.contentSecurityPolicy=VALUE` | Adds CSP Header with the custom value. |
| `<prefix>.frontend.headers.contentTypeNosniff=true` | Adds the `X-Content-Type-Options` header with the value `nosniff`. |
| `<prefix>.frontend.headers.customBrowserXSSValue=VALUE` | Set custom value for X-XSS-Protection header. This overrides the BrowserXssFilter option. |
| `<prefix>.frontend.headers.customFrameOptionsValue=VALUE` | Overrides the `X-Frame-Options` header with the custom value. |
| `<prefix>.frontend.headers.forceSTSHeader=false` | Adds the STS header to non-SSL requests. |
| `<prefix>.frontend.headers.frameDeny=false` | Adds the `X-Frame-Options` header with the value of `DENY`. |
| `<prefix>.frontend.headers.hostsProxyHeaders=EXPR` | Provides a list of headers that the proxied hostname may be stored.<br>Format: `HEADER1,HEADER2` |
| `<prefix>.frontend.headers.isDevelopment=false` | This will cause the `AllowedHosts`, `SSLRedirect`, and `STSSeconds`/`STSIncludeSubdomains` options to be ignored during development.<br>When deploying to production, be sure to set this to false. |
| `<prefix>.frontend.headers.publicKey=VALUE` | Adds pinned HTST public key header. |
| `<prefix>.frontend.headers.referrerPolicy=VALUE` | Adds referrer policy header. |
| `<prefix>.frontend.headers.SSLRedirect=true` | Forces the frontend to redirect to SSL if a non-SSL request is sent. |
| `<prefix>.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. |
| `<prefix>.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. |
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| `<prefix>.frontend.headers.SSLForceHost=true` | If `SSLForceHost` is `true` and `SSLHost` is set, requests will be forced to use `SSLHost` even the ones that are already using SSL. Default is false. |
| `<prefix>.frontend.headers.SSLProxyHeaders=EXPR` | Header combinations that would signify a proper SSL Request (Such as `X-Forwarded-For:https`).<br>Format: <code>HEADER:value&vert;&vert;HEADER2:value2</code> |
| `<prefix>.frontend.headers.STSSeconds=315360000` | Sets the max-age of the STS header. |
| `<prefix>.frontend.headers.STSIncludeSubdomains=true` | Adds the `IncludeSubdomains` section of the STS header. |
| `<prefix>.frontend.headers.STSPreload=true` | Adds the preload flag to the STS header. |
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### Examples
If you want that Træfik uses Consul tags correctly you need to defined them like that:
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```js
traefik.enable=true
traefik.tags=api
traefik.tags=external
```
If the prefix defined in Træfik configuration is `bla`, tags need to be defined like that:
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```js
bla.enable=true
bla.tags=api
bla.tags=external
```