traefik/docs/configuration/backends/consulcatalog.md

Consul Catalog Provider

Traefik can be configured to use service discovery catalog of Consul as a provider.

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

Tags

Additional settings can be defined using Consul Catalog tags.

!!! note The default prefix is traefik.

Label	Description
<prefix>.enable=false	Disables this container in Traefik.
<prefix>.protocol=https	Overrides the default http protocol.
<prefix>.weight=10	Assigns this weight to the container.
traefik.backend.buffering.maxRequestBodyBytes=0	See buffering section.
traefik.backend.buffering.maxResponseBodyBytes=0	See buffering section.
traefik.backend.buffering.memRequestBodyBytes=0	See buffering section.
traefik.backend.buffering.memResponseBodyBytes=0	See buffering section.
traefik.backend.buffering.retryExpression=EXPR	See buffering section.
<prefix>.backend.circuitbreaker.expression=EXPR	Creates a circuit breaker to be used against the backend. ex: NetworkErrorRatio() > 0.
<prefix>.backend.healthcheck.path=/health	Enables health check for the backend, hitting the container at path.
<prefix>.backend.healthcheck.interval=1s	Defines the health check interval.
<prefix>.backend.healthcheck.port=8080	Sets a different port for the health check.
traefik.backend.healthcheck.scheme=http	Overrides the server URL scheme.
<prefix>.backend.healthcheck.hostname=foobar.com	Defines the health check hostname.
<prefix>.backend.healthcheck.headers=EXPR	Defines the health check request headers Format: HEADER:value||HEADER2:value2
<prefix>.backend.loadbalancer.method=drr	Overrides the default wrr load balancer algorithm.
<prefix>.backend.loadbalancer.stickiness=true	Enables backend sticky sessions.
<prefix>.backend.loadbalancer.stickiness.cookieName=NAME	Sets the cookie name manually for sticky sessions.
<prefix>.backend.loadbalancer.sticky=true	Enables backend sticky sessions. (DEPRECATED)
<prefix>.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.
<prefix>.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.
<prefix>.frontend.auth.basic=EXPR	Sets basic authentication to this frontend in CSV format: User:Hash,User:Hash (DEPRECATED).
<prefix>.frontend.auth.basic.removeHeader=true	If set to true, removes the Authorization header.
<prefix>.frontend.auth.basic.users=EXPR	Sets basic authentication to this frontend in CSV format: User:Hash,User:Hash.
<prefix>.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.
<prefix>.frontend.auth.digest.removeHeader=true	If set to true, removes the Authorization header.
<prefix>.frontend.auth.digest.users=EXPR	Sets digest authentication to this frontend in CSV format: User:Realm:Hash,User:Realm:Hash.
<prefix>.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.
<prefix>.frontend.auth.forward.address=https://example.com	Sets the URL of the authentication server.
<prefix>.frontend.auth.forward.authResponseHeaders=EXPR	Sets the forward authentication authResponseHeaders in CSV format: X-Auth-User,X-Auth-Header
<prefix>.frontend.auth.forward.tls.ca=/path/ca.pem	Sets the Certificate Authority (CA) for the TLS connection with the authentication server.
<prefix>.frontend.auth.forward.tls.caOptional=true	Checks the certificates if present but do not force to be signed by a specified Certificate Authority (CA).
<prefix>.frontend.auth.forward.tls.cert=/path/server.pem	Sets the Certificate for the TLS connection with the authentication server.
<prefix>.frontend.auth.forward.tls.insecureSkipVerify=true	If set to true invalid SSL certificates are accepted.
<prefix>.frontend.auth.forward.tls.key=/path/server.key	Sets the Certificate for the TLS connection with the authentication server.
<prefix>.frontend.auth.forward.trustForwardHeader=true	Trusts X-Forwarded-* headers.
<prefix>.frontend.auth.headerField=X-WebAuth-User	Sets the header used to pass the authenticated user to the application.
<prefix>.frontend.entryPoints=http,https	Assigns this frontend to entry points http and https. Overrides defaultEntryPoints
<prefix>.frontend.errors.<name>.backend=NAME	See custom error pages section.
<prefix>.frontend.errors.<name>.query=PATH	See custom error pages section.
<prefix>.frontend.errors.<name>.status=RANGE	See custom error pages section.
<prefix>.frontend.passHostHeader=true	Forwards client Host header to the backend.
<prefix>.frontend.passTLSClientCert.infos.notAfter=true	Add the noAfter field in a escaped client infos in the X-Forwarded-Ssl-Client-Cert-Infos header.
<prefix>.frontend.passTLSClientCert.infos.notBefore=true	Add the noBefore field in a escaped client infos in the X-Forwarded-Ssl-Client-Cert-Infos header.
<prefix>.frontend.passTLSClientCert.infos.sans=true	Add the sans field in a escaped client infos in the X-Forwarded-Ssl-Client-Cert-Infos header.
<prefix>.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.
<prefix>.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.
<prefix>.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.
<prefix>.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.
<prefix>.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.
<prefix>.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.
<prefix>.frontend.passTLSClientCert.pem=true	Pass the escaped pem in the X-Forwarded-Ssl-Client-Cert header.
<prefix>.frontend.passTLSCert=true	Forwards TLS Client certificates to the backend.
<prefix>.frontend.priority=10	Overrides default frontend priority.
<prefix>.frontend.rateLimit.extractorFunc=EXP	See rate limiting section.
<prefix>.frontend.rateLimit.rateSet.<name>.period=6	See rate limiting section.
<prefix>.frontend.rateLimit.rateSet.<name>.average=6	See rate limiting section.
<prefix>.frontend.rateLimit.rateSet.<name>.burst=6	See rate limiting section.
<prefix>.frontend.redirect.entryPoint=https	Enables Redirect to another entryPoint to this frontend (e.g. HTTPS).
<prefix>.frontend.redirect.regex=^http://localhost/(.*)	Redirects to another URL to this frontend. Must be set with traefik.frontend.redirect.replacement.
<prefix>.frontend.redirect.replacement=http://mydomain/$1	Redirects to another URL to this frontend. Must be set with traefik.frontend.redirect.regex.
<prefix>.frontend.redirect.permanent=true	Returns 301 instead of 302.
<prefix>.frontend.rule=EXPR	Overrides the default frontend rule. Default: Host:{{.ServiceName}}.{{.Domain}}.
<prefix>.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.
<prefix>.frontend.whiteList.useXForwardedFor=true	Uses X-Forwarded-For header as valid source of IP for the white list.

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:

<prefix>.frontends.A.rule=Host:A:PathPrefix:/A
<prefix>.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 <prefix>.frontend from the table above.

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. Format: HEADER:value||HEADER2:value2
<prefix>.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
<prefix>.frontend.headers.allowedHosts=EXPR	Provides a list of allowed hosts that requests will be processed. 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. Format: HEADER1,HEADER2
<prefix>.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.
<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.
<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). Format: HEADER:value||HEADER2:value2
<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.

Examples

If you want that Traefik uses Consul tags correctly you need to defined them like that:

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:

bla.enable=true
bla.tags=api
bla.tags=external