# Consul Catalog Provider Traefik 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 base domain used for the frontend rules. # # 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}}" # Enable Consul catalog TLS connection. # # Optional # # [consulCatalog.tls] # ca = "/etc/ssl/ca.crt" # cert = "/etc/ssl/consul.crt" # key = "/etc/ssl/consul.key" # 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) # # 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 | |----------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `.enable=false` | Disables this container in Traefik. | | `.protocol=https` | Overrides the default `http` protocol. | | `.weight=10` | Assigns this weight to the container. | | `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. | | `.backend.circuitbreaker.expression=EXPR` | Creates a [circuit breaker](/basics/#backends) to be used against the backend. ex: `NetworkErrorRatio() > 0.` | | `.backend.responseForwarding.flushInterval=10ms` | Defines the interval between two flushes when forwarding response from backend to client. | | `.backend.healthcheck.path=/health` | Enables health check for the backend, hitting the container at `path`. | | `.backend.healthcheck.interval=5s` | Defines the health check interval. | | `.backend.healthcheck.timeout=3s` | Defines the health check request timeout | | `.backend.healthcheck.port=8080` | Sets a different port for the health check. | | `traefik.backend.healthcheck.scheme=http` | Overrides the server URL scheme. | | `.backend.healthcheck.hostname=foobar.com` | Defines the health check hostname. | | `.backend.healthcheck.headers=EXPR` | Defines the health check request headers
Format: HEADER:value||HEADER2:value2 | | `.backend.loadbalancer.method=drr` | Overrides the default `wrr` load balancer algorithm. | | `.backend.loadbalancer.stickiness=true` | Enables backend sticky sessions. | | `.backend.loadbalancer.stickiness.cookieName=NAME` | Sets the cookie name manually for sticky sessions. | | `.backend.maxconn.amount=10` | Sets a maximum number of connections to the backend.
Must be used in conjunction with the below label to take effect. | | `.backend.maxconn.extractorfunc=client.ip` | Sets 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. | | `.frontend.auth.basic=EXPR` | Sets basic authentication to this frontend in CSV format: `User:Hash,User:Hash` (DEPRECATED). | | `.frontend.auth.basic.removeHeader=true` | If set to `true`, removes the `Authorization` header. | | `.frontend.auth.basic.users=EXPR` | Sets basic authentication to this frontend in CSV format: `User:Hash,User:Hash`. | | `.frontend.auth.basic.usersfile=/path/.htpasswd` | Sets basic authentication with an external file; if users and usersFile are provided, both are merged, with external file contents having precedence. | | `.frontend.auth.digest.removeHeader=true` | If set to `true`, removes the `Authorization` header. | | `.frontend.auth.digest.users=EXPR` | Sets digest authentication to this frontend in CSV format: `User:Realm:Hash,User:Realm:Hash`. | | `.frontend.auth.digest.usersfile=/path/.htdigest` | Sets digest authentication with an external file; if users and usersFile are provided, both are merged, with external file contents having precedence. | | `.frontend.auth.forward.address=https://example.com` | Sets the URL of the authentication server. | | `.frontend.auth.forward.authResponseHeaders=EXPR` | Sets the forward authentication authResponseHeaders in CSV format: `X-Auth-User,X-Auth-Header` | | `.frontend.auth.forward.tls.ca=/path/ca.pem` | Sets the Certificate Authority (CA) for the TLS connection with the authentication server. | | `.frontend.auth.forward.tls.caOptional=true` | Checks the certificates if present but do not force to be signed by a specified Certificate Authority (CA). | | `.frontend.auth.forward.tls.cert=/path/server.pem` | Sets the Certificate for the TLS connection with the authentication server. | | `.frontend.auth.forward.tls.insecureSkipVerify=true` | If set to true invalid SSL certificates are accepted. | | `.frontend.auth.forward.tls.key=/path/server.key` | Sets the Certificate for the TLS connection with the authentication server. | | `.frontend.auth.forward.trustForwardHeader=true` | Trusts X-Forwarded-* headers. | | `.frontend.auth.headerField=X-WebAuth-User` | Sets the header used to pass the authenticated user to the application. | | `.frontend.entryPoints=http,https` | Assigns this frontend to entry points `http` and `https`.
Overrides `defaultEntryPoints` | | `.frontend.errors..backend=NAME` | See [custom error pages](/configuration/commons/#custom-error-pages) section. | | `.frontend.errors..query=PATH` | See [custom error pages](/configuration/commons/#custom-error-pages) section. | | `.frontend.errors..status=RANGE` | See [custom error pages](/configuration/commons/#custom-error-pages) section. | | `.frontend.passHostHeader=true` | Forwards client `Host` header to the backend. | | `.frontend.passTLSClientCert.infos.notAfter=true` | Add the noAfter field in a escaped client infos in the `X-Forwarded-Ssl-Client-Cert-Infos` header. | | `.frontend.passTLSClientCert.infos.notBefore=true` | Add the noBefore field in a escaped client infos in the `X-Forwarded-Ssl-Client-Cert-Infos` header. | | `.frontend.passTLSClientCert.infos.sans=true` | Add the sans field in a escaped client infos in the `X-Forwarded-Ssl-Client-Cert-Infos` header. | | `.frontend.passTLSClientCert.infos.subject.commonName=true` | Add the subject.commonName field in a escaped client infos in the `X-Forwarded-Ssl-Client-Cert-Infos` header. | | `.frontend.passTLSClientCert.infos.subject.country=true` | Add the subject.country field in a escaped client infos in the `X-Forwarded-Ssl-Client-Cert-Infos` header. | | `.frontend.passTLSClientCert.infos.subject.locality=true` | Add the subject.locality field in a escaped client infos in the `X-Forwarded-Ssl-Client-Cert-Infos` header. | | `.frontend.passTLSClientCert.infos.subject.organization=true`| Add the subject.organization field in a escaped client infos in the `X-Forwarded-Ssl-Client-Cert-Infos` header. | | `.frontend.passTLSClientCert.infos.subject.province=true` | Add the subject.province field in a escaped client infos in the `X-Forwarded-Ssl-Client-Cert-Infos` header. | | `.frontend.passTLSClientCert.infos.subject.serialNumber=true`| Add the subject.serialNumber field in a escaped client infos in the `X-Forwarded-Ssl-Client-Cert-Infos` header. | | `.frontend.passTLSClientCert.pem=true` | Pass the escaped pem in the `X-Forwarded-Ssl-Client-Cert` header. | | `.frontend.passTLSCert=true` | Forwards TLS Client certificates to the backend. | | `.frontend.priority=10` | Overrides default frontend priority. | | `.frontend.rateLimit.extractorFunc=EXP` | See [rate limiting](/configuration/commons/#rate-limiting) section. | | `.frontend.rateLimit.rateSet..period=6` | See [rate limiting](/configuration/commons/#rate-limiting) section. | | `.frontend.rateLimit.rateSet..average=6` | See [rate limiting](/configuration/commons/#rate-limiting) section. | | `.frontend.rateLimit.rateSet..burst=6` | See [rate limiting](/configuration/commons/#rate-limiting) section. | | `.frontend.redirect.entryPoint=https` | Enables Redirect to another entryPoint to this frontend (e.g. HTTPS). | | `.frontend.redirect.regex=^http://localhost/(.*)` | Redirects to another URL to this frontend.
Must be set with `traefik.frontend.redirect.replacement`. | | `.frontend.redirect.replacement=http://mydomain/$1` | Redirects to another URL to this frontend.
Must be set with `traefik.frontend.redirect.regex`. | | `.frontend.redirect.permanent=true` | Returns 301 instead of 302. | | `.frontend.rule=EXPR` | Overrides the default frontend rule. Default: `Host:{{.ServiceName}}.{{.Domain}}`. | | `.frontend.whiteList.sourceRange=RANGE` | Sets a 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. | | `.frontend.whiteList.ipStrategy=true` | Uses the default IPStrategy.
Can be used when there is an existing `clientIPStrategy` but you want the remote address for whitelisting. | | `.frontend.whiteList.ipStrategy.depth=5` | See [whitelist](/configuration/entrypoints/#white-listing) | | `.frontend.whiteList.ipStrategy.excludedIPs=127.0.0.1` | See [whitelist](/configuration/entrypoints/#white-listing) | ### Multiple frontends for a single service If you need to support multiple frontends for a service, for example when having multiple `rules` that can't be combined, specify them as follows: ``` .frontends.A.rule=Host:A:PathPrefix:/A .frontends.B.rule=Host:B:PathPrefix:/ ``` `A` and `B` here are just arbitrary names, they can be anything. You can use any setting that applies to `.frontend` from the table above. ### Custom Headers !!! note The default prefix is `traefik`. | Label | Description | |--------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `.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 | | `.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 | ### Security Headers !!! note The default prefix is `traefik`. | Label | Description | |-----------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `.frontend.headers.allowedHosts=EXPR` | Provides a list of allowed hosts that requests will be processed.
Format: `Host1,Host2` | | `.frontend.headers.browserXSSFilter=true` | Adds the X-XSS-Protection header with the value `1; mode=block`. | | `.frontend.headers.contentSecurityPolicy=VALUE` | Adds CSP Header with the custom value. | | `.frontend.headers.contentTypeNosniff=true` | Adds the `X-Content-Type-Options` header with the value `nosniff`. | | `.frontend.headers.customBrowserXSSValue=VALUE` | Set custom value for X-XSS-Protection header. This overrides the BrowserXssFilter option. | | `.frontend.headers.customFrameOptionsValue=VALUE` | Overrides the `X-Frame-Options` header with the custom value. | | `.frontend.headers.forceSTSHeader=false` | Adds the STS header to non-SSL requests. | | `.frontend.headers.frameDeny=false` | Adds the `X-Frame-Options` header with the value of `DENY`. | | `.frontend.headers.hostsProxyHeaders=EXPR` | Provides a list of headers that the proxied hostname may be stored.
Format: `HEADER1,HEADER2` | | `.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. | | `.frontend.headers.publicKey=VALUE` | Adds HPKP header. | | `.frontend.headers.referrerPolicy=VALUE` | Adds referrer policy header. | | `.frontend.headers.SSLRedirect=true` | Forces the frontend to redirect to SSL if a non-SSL request is sent. | | `.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. | | `.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. | | `.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. | | `.frontend.headers.SSLProxyHeaders=EXPR` | Header combinations that would signify a proper SSL Request (Such as `X-Forwarded-For:https`).
Format: HEADER:value||HEADER2:value2 | | `.frontend.headers.STSSeconds=315360000` | Sets the max-age of the STS header. | | `.frontend.headers.STSIncludeSubdomains=true` | Adds the `IncludeSubdomains` section of the STS header. | | `.frontend.headers.STSPreload=true` | Adds the preload flag to the STS header. | ### Examples If you want that Traefik uses Consul tags correctly you need to defined them like that: ```js traefik.enable=true traefik.tags=api traefik.tags=external ``` If the prefix defined in Traefik configuration is `bla`, tags need to be defined like that: ```js bla.enable=true bla.tags=api bla.tags=external ```