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# Docker Provider
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Træfik can be configured to use Docker as a provider.
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## Docker
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```toml
################################################################
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# Docker Provider
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################################################################
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# Enable Docker Provider.
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[docker]
# Docker server endpoint. Can be a tcp or a unix socket endpoint.
#
# Required
#
endpoint = "unix:///var/run/docker.sock"
# Default domain used.
# Can be overridden by setting the "traefik.domain" label on a container.
#
# Required
#
domain = "docker.localhost"
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# Enable watch docker changes.
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#
# Optional
#
watch = true
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# Override default configuration template.
# For advanced users :)
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#
# Optional
#
# filename = "docker.tmpl"
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# 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
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# Expose containers by default in Traefik.
# If set to false, containers that don't have `traefik.enable=true` will be ignored.
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#
# Optional
# Default: true
#
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exposedByDefault = true
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# Use the IP address from the binded port instead of the inner network one.
# For specific use-case :)
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#
# Optional
# Default: false
#
usebindportip = true
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# Use Swarm Mode services as data provider.
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#
# Optional
# Default: false
#
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swarmMode = false
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# Define a default docker network to use for connections to all containers.
# Can be overridden by the traefik.docker.network label.
#
# Optional
#
network = "web"
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# Enable docker TLS connection.
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#
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# Optional
#
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# [docker.tls]
# ca = "/etc/ssl/ca.crt"
# cert = "/etc/ssl/docker.crt"
# key = "/etc/ssl/docker.key"
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# insecureSkipVerify = true
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```
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To enable constraints see [provider-specific constraints section ](/configuration/commons/#provider-specific ).
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## Docker Swarm Mode
```toml
################################################################
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# Docker Swarm Mode Provider
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################################################################
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# Enable Docker Provider.
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[docker]
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# Docker server endpoint.
# Can be a tcp or a unix socket endpoint.
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#
# Required
# Default: "unix:///var/run/docker.sock"
#
endpoint = "tcp://127.0.0.1:2375"
# Default domain used.
# Can be overridden by setting the "traefik.domain" label on a services.
#
# Optional
# Default: ""
#
domain = "docker.localhost"
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# Enable watch docker changes.
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#
# Optional
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# Default: true
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#
watch = true
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# Use Docker Swarm Mode as data provider.
#
# Optional
# Default: false
#
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swarmMode = true
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# Define a default docker network to use for connections to all containers.
# Can be overridden by the traefik.docker.network label.
#
# Optional
#
network = "web"
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# Override default configuration template.
# For advanced users :)
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#
# Optional
#
# filename = "docker.tmpl"
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# 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
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# Expose services by default in Traefik.
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#
# Optional
# Default: true
#
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exposedByDefault = false
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# Enable docker TLS connection.
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#
# Optional
#
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# [docker.tls]
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# ca = "/etc/ssl/ca.crt"
# cert = "/etc/ssl/docker.crt"
# key = "/etc/ssl/docker.key"
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# insecureSkipVerify = true
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```
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To enable constraints see [provider-specific constraints section ](/configuration/commons/#provider-specific ).
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## Labels: overriding default behavior
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### Using Docker with Swarm Mode
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If you use a compose file with the Swarm mode, labels should be defined in the `deploy` part of your service.
This behavior is only enabled for docker-compose version 3+ ([Compose file reference](https://docs.docker.com/compose/compose-file/#labels-1)).
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```yaml
version: "3"
services:
whoami:
deploy:
labels:
traefik.docker.network: traefik
```
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### Using Docker Compose
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If you are intending to use only Docker Compose commands (e.g. `docker-compose up --scale whoami=2 -d` ), labels should be under your service, otherwise they will be ignored.
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```yaml
version: "3"
services:
whoami:
labels:
traefik.docker.network: traefik
```
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### On Containers
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Labels can be used on containers to override default behavior.
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| Label | Description |
|------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `traefik.docker.network` | Overrides the default docker network to use for connections to the container. [1] |
| `traefik.domain` | Sets the default domain for the frontend rules. |
| `traefik.enable=false` | Disables this container in Træfik. |
| `traefik.port=80` | Registers this port. Useful when the container exposes multiples ports. |
| `traefik.protocol=https` | Overrides the default `http` protocol |
| `traefik.weight=10` | Assigns this weight to the container |
| `traefik.backend=foo` | Gives the name `foo` to the generated backend for this 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. |
| `traefik.backend.circuitbreaker.expression=EXPR` | Creates a [circuit breaker ](/basics/#backends ) to be used against the backend |
| `traefik.backend.healthcheck.path=/health` | Enables health check for the backend, hitting the container at `path` . |
| `traefik.backend.healthcheck.interval=1s` | Defines the health check interval. |
| `traefik.backend.healthcheck.port=8080` | Sets a different port for the health check. |
| `traefik.backend.healthcheck.scheme=http` | Overrides the server URL scheme. |
| `traefik.backend.healthcheck.hostname=foobar.com` | Defines the health check hostname. |
| `traefik.backend.healthcheck.headers=EXPR` | Defines the health check request headers < br > Format: < code > HEADER:value|| HEADER2:value2</ code > |
| `traefik.backend.loadbalancer.method=drr` | Overrides the default `wrr` load balancer algorithm |
| `traefik.backend.loadbalancer.stickiness=true` | Enables backend sticky sessions |
| `traefik.backend.loadbalancer.stickiness.cookieName=NAME` | Sets the cookie name manually for sticky sessions |
| `traefik.backend.loadbalancer.sticky=true` | Enables backend sticky sessions (DEPRECATED) |
| `traefik.backend.loadbalancer.swarm=true` | Uses Swarm's inbuilt load balancer (only relevant under Swarm Mode). |
| `traefik.backend.maxconn.amount=10` | Sets a maximum number of connections to the backend.< br > Must be used in conjunction with the below label to take effect. |
| `traefik.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.< br > Must be used in conjunction with the above label to take effect. |
| `traefik.frontend.auth.basic=EXPR` | Sets the basic authentication to this frontend in CSV format: `User:Hash,User:Hash` [2] (DEPRECATED). |
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| `traefik.frontend.auth.basic.removeHeader=true` | If set to `true` , removes the `Authorization` header. |
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| `traefik.frontend.auth.basic.users=EXPR` | Sets the basic authentication to this frontend in CSV format: `User:Hash,User:Hash` [2]. |
| `traefik.frontend.auth.basic.usersfile=/path/.htpasswd` | Sets the basic authentication with an external file; if users and usersFile are provided, both are merged, with external file contents having precedence. |
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| `traefik.frontend.auth.digest.removeHeader=true` | If set to `true` , removes the `Authorization` header. |
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| `traefik.frontend.auth.digest.users=EXPR` | Sets the digest authentication to this frontend in CSV format: `User:Realm:Hash,User:Realm:Hash` . |
| `traefik.frontend.auth.digest.usersfile=/path/.htdigest` | Sets the digest authentication with an external file; if users and usersFile are provided, both are merged, with external file contents having precedence. |
| `traefik.frontend.auth.forward.address=https://example.com` | Sets the URL of the authentication server. |
| `traefik.frontend.auth.forward.tls.ca=/path/ca.pem` | Sets the Certificate Authority (CA) for the TLS connection with the authentication server. |
| `traefik.frontend.auth.forward.tls.caOptional=true` | Checks the certificates if present but do not force to be signed by a specified Certificate Authority (CA). |
| `traefik.frontend.auth.forward.tls.cert=/path/server.pem` | Sets the Certificate for the TLS connection with the authentication server. |
| `traefik.frontend.auth.forward.tls.insecureSkipVerify=true` | If set to true invalid SSL certificates are accepted. |
| `traefik.frontend.auth.forward.tls.key=/path/server.key` | Sets the Certificate for the TLS connection with the authentication server. |
| `traefik.frontend.auth.forward.trustForwardHeader=true` | Trusts X-Forwarded-* headers. |
| `traefik.frontend.auth.headerField=X-WebAuth-User` | Sets the header user to pass the authenticated user to the application. |
| `traefik.frontend.entryPoints=http,https` | Assigns this frontend to entry points `http` and `https` .< br > Overrides `defaultEntryPoints` |
| `traefik.frontend.errors.<name>.backend=NAME` | See [custom error pages ](/configuration/commons/#custom-error-pages ) section. |
| `traefik.frontend.errors.<name>.query=PATH` | See [custom error pages ](/configuration/commons/#custom-error-pages ) section. |
| `traefik.frontend.errors.<name>.status=RANGE` | See [custom error pages ](/configuration/commons/#custom-error-pages ) section. |
| `traefik.frontend.passHostHeader=true` | Forwards client `Host` header to the backend. |
| `traefik.frontend.passTLSCert=true` | Forwards TLS Client certificates to the backend. |
| `traefik.frontend.priority=10` | Overrides default frontend priority |
| `traefik.frontend.rateLimit.extractorFunc=EXP` | See [rate limiting ](/configuration/commons/#rate-limiting ) section. |
| `traefik.frontend.rateLimit.rateSet.<name>.period=6` | See [rate limiting ](/configuration/commons/#rate-limiting ) section. |
| `traefik.frontend.rateLimit.rateSet.<name>.average=6` | See [rate limiting ](/configuration/commons/#rate-limiting ) section. |
| `traefik.frontend.rateLimit.rateSet.<name>.burst=6` | See [rate limiting ](/configuration/commons/#rate-limiting ) section. |
| `traefik.frontend.redirect.entryPoint=https` | Enables Redirect to another entryPoint to this frontend (e.g. HTTPS) |
| `traefik.frontend.redirect.regex=^http://localhost/(.*)` | Redirects to another URL to this frontend.< br > Must be set with `traefik.frontend.redirect.replacement` . |
| `traefik.frontend.redirect.replacement=http://mydomain/$1` | Redirects to another URL to this frontend.< br > Must be set with `traefik.frontend.redirect.regex` . |
| `traefik.frontend.redirect.permanent=true` | Returns 301 instead of 302. |
| `traefik.frontend.rule=EXPR` | Overrides the default frontend rule. Default: `Host:{containerName}.{domain}` or `Host:{service}.{project_name}.{domain}` if you are using `docker-compose` . |
| `traefik.frontend.whiteList.sourceRange=RANGE` | Sets a list of IP-Ranges which are allowed to access.< br > An unset or empty list allows all Source-IPs to access.< br > If one of the Net-Specifications are invalid, the whole list is invalid and allows all Source-IPs to access. |
| `traefik.frontend.whiteList.useXForwardedFor=true` | Uses `X-Forwarded-For` header as valid source of IP for the white list. |
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[1] `traefik.docker.network` :
If a container is linked to several networks, be sure to set the proper network name (you can check with `docker inspect <container_id>` ) otherwise it will randomly pick one (depending on how docker is returning them).
For instance when deploying docker `stack` from compose files, the compose defined networks will be prefixed with the `stack` name.
Or if your service references external network use it's name instead.
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[2] `traefik.frontend.auth.basic.users=EXPR ` :
To create `user:password` pair, it's possible to use this command:
`echo $(htpasswd -nb user password) | sed -e s/\\$/\\$\\$/g` .
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The result will be `user:$$apr1$$9Cv/OMGj$$ZomWQzuQbL.3TRCS81A1g/` , note additional symbol `$` makes escaping.
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#### Custom Headers
| Label | Description |
|-------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `traefik.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|| HEADER2:value2</ code > |
| `traefik.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|| HEADER2:value2</ code > |
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#### Security Headers
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| Label | Description |
|----------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| `traefik.frontend.headers.allowedHosts=EXPR` | Provides a list of allowed hosts that requests will be processed.< br > Format: `Host1,Host2` |
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| `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.contentTypeNosniff=true` | Adds the `X-Content-Type-Options` header with the value `nosniff` . |
| `traefik.frontend.headers.customBrowserXSSValue=VALUE` | Set custom value for X-XSS-Protection header. This overrides the BrowserXssFilter option. |
| `traefik.frontend.headers.customFrameOptionsValue=VALUE` | Overrides the `X-Frame-Options` header with the custom value. |
| `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` . |
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| `traefik.frontend.headers.hostsProxyHeaders=EXPR ` | Provides a list of headers that the proxied hostname may be stored.< br > Format: `HEADER1,HEADER2` |
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| `traefik.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. |
| `traefik.frontend.headers.publicKey=VALUE` | Adds pinned HTST public key header. |
| `traefik.frontend.headers.referrerPolicy=VALUE` | Adds referrer policy header. |
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| `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. |
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| `traefik.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. |
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| `traefik.frontend.headers.SSLProxyHeaders=EXPR` | Header combinations that would signify a proper SSL Request (Such as `X-Forwarded-For:https` ).< br > Format: < code > HEADER:value|| HEADER2:value2</ code > |
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| `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. |
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### On containers with Multiple Ports (segment labels)
Segment labels are used to define routes to a container exposing multiple ports.
A segment is a group of labels that apply to a port exposed by a container.
You can define as many segments as ports exposed in a container.
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Segment labels override the default behavior.
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| Label | Description |
|---------------------------------------------------------------------------|---------------------------------------------------------------|
| `traefik.<segment_name>.backend=BACKEND` | Same as `traefik.backend` |
| `traefik.<segment_name>.domain=DOMAIN` | Same as `traefik.domain` |
| `traefik.<segment_name>.port=PORT` | Same as `traefik.port` |
| `traefik.<segment_name>.protocol=http` | Same as `traefik.protocol` |
| `traefik.<segment_name>.weight=10` | Same as `traefik.weight` |
| `traefik.<segment_name>.frontend.auth.basic=EXPR` | Same as `traefik.frontend.auth.basic` |
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| `traefik.<segment_name>.frontend.auth.basic.removeHeader=true` | Same as `traefik.frontend.auth.basic.removeHeader` |
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| `traefik.<segment_name>.frontend.auth.basic.users=EXPR` | Same as `traefik.frontend.auth.basic.users` |
| `traefik.<segment_name>.frontend.auth.basic.usersfile=/path/.htpasswd` | Same as `traefik.frontend.auth.basic.usersfile` |
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| `traefik.<segment_name>.frontend.auth.digest.removeHeader=true` | Same as `traefik.frontend.auth.digest.removeHeader` |
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| `traefik.<segment_name>.frontend.auth.digest.users=EXPR` | Same as `traefik.frontend.auth.digest.users` |
| `traefik.<segment_name>.frontend.auth.digest.usersfile=/path/.htdigest` | Same as `traefik.frontend.auth.digest.usersfile` |
| `traefik.<segment_name>.frontend.auth.forward.address=https://example.com` | Same as `traefik.frontend.auth.forward.address` |
| `traefik.<segment_name>.frontend.auth.forward.tls.ca=/path/ca.pem` | Same as `traefik.frontend.auth.forward.tls.ca` |
| `traefik.<segment_name>.frontend.auth.forward.tls.caOptional=true` | Same as `traefik.frontend.auth.forward.tls.caOptional` |
| `traefik.<segment_name>.frontend.auth.forward.tls.cert=/path/server.pem` | Same as `traefik.frontend.auth.forward.tls.cert` |
| `traefik.<segment_name>.frontend.auth.forward.tls.insecureSkipVerify=true` | Same as `traefik.frontend.auth.forward.tls.insecureSkipVerify` |
| `traefik.<segment_name>.frontend.auth.forward.tls.key=/path/server.key` | Same as `traefik.frontend.auth.forward.tls.key` |
| `traefik.<segment_name>.frontend.auth.forward.trustForwardHeader=true` | Same as `traefik.frontend.auth.forward.trustForwardHeader` |
| `traefik.<segment_name>.frontend.auth.headerField=X-WebAuth-User` | Same as `traefik.frontend.auth.headerField` |
| `traefik.<segment_name>.frontend.entryPoints=https` | Same as `traefik.frontend.entryPoints` |
| `traefik.<segment_name>.frontend.errors.<name>.backend=NAME` | Same as `traefik.frontend.errors.<name>.backend` |
| `traefik.<segment_name>.frontend.errors.<name>.query=PATH` | Same as `traefik.frontend.errors.<name>.query` |
| `traefik.<segment_name>.frontend.errors.<name>.status=RANGE` | Same as `traefik.frontend.errors.<name>.status` |
| `traefik.<segment_name>.frontend.passHostHeader=true` | Same as `traefik.frontend.passHostHeader` |
| `traefik.<segment_name>.frontend.passTLSCert=true` | Same as `traefik.frontend.passTLSCert` |
| `traefik.<segment_name>.frontend.priority=10` | Same as `traefik.frontend.priority` |
| `traefik.<segment_name>.frontend.rateLimit.extractorFunc=EXP` | Same as `traefik.frontend.rateLimit.extractorFunc` |
| `traefik.<segment_name>.frontend.rateLimit.rateSet.<name>.period=6` | Same as `traefik.frontend.rateLimit.rateSet.<name>.period` |
| `traefik.<segment_name>.frontend.rateLimit.rateSet.<name>.average=6` | Same as `traefik.frontend.rateLimit.rateSet.<name>.average` |
| `traefik.<segment_name>.frontend.rateLimit.rateSet.<name>.burst=6` | Same as `traefik.frontend.rateLimit.rateSet.<name>.burst` |
| `traefik.<segment_name>.frontend.redirect.entryPoint=https` | Same as `traefik.frontend.redirect.entryPoint` |
| `traefik.<segment_name>.frontend.redirect.regex=^http://localhost/(.*)` | Same as `traefik.frontend.redirect.regex` |
| `traefik.<segment_name>.frontend.redirect.replacement=http://mydomain/$1` | Same as `traefik.frontend.redirect.replacement` |
| `traefik.<segment_name>.frontend.redirect.permanent=true` | Same as `traefik.frontend.redirect.permanent` |
| `traefik.<segment_name>.frontend.rule=EXP` | Same as `traefik.frontend.rule` |
| `traefik.<segment_name>.frontend.whiteList.sourceRange=RANGE` | Same as `traefik.frontend.whiteList.sourceRange` |
| `traefik.<segment_name>.frontend.whiteList.useXForwardedFor=true` | Same as `traefik.frontend.whiteList.useXForwardedFor` |
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#### Custom Headers
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| Label | Description |
|----------------------------------------------------------------------|----------------------------------------------------------|
| `traefik.<segment_name>.frontend.headers.customRequestHeaders=EXPR ` | Same as `traefik.frontend.headers.customRequestHeaders` |
| `traefik.<segment_name>.frontend.headers.customResponseHeaders=EXPR` | Same as `traefik.frontend.headers.customResponseHeaders` |
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#### Security Headers
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| Label | Description |
|-------------------------------------------------------------------------|--------------------------------------------------------------|
| `traefik.<segment_name>.frontend.headers.allowedHosts=EXPR` | Same as `traefik.frontend.headers.allowedHosts` |
| `traefik.<segment_name>.frontend.headers.browserXSSFilter=true` | Same as `traefik.frontend.headers.browserXSSFilter` |
| `traefik.<segment_name>.frontend.headers.contentSecurityPolicy=VALUE` | Same as `traefik.frontend.headers.contentSecurityPolicy` |
| `traefik.<segment_name>.frontend.headers.contentTypeNosniff=true` | Same as `traefik.frontend.headers.contentTypeNosniff` |
| `traefik.<segment_name>.frontend.headers.customBrowserXSSValue=VALUE` | Same as `traefik.frontend.headers.customBrowserXSSValue` |
| `traefik.<segment_name>.frontend.headers.customFrameOptionsValue=VALUE` | Same as `traefik.frontend.headers.customFrameOptionsValue` |
| `traefik.<segment_name>.frontend.headers.forceSTSHeader=false` | Same as `traefik.frontend.headers.forceSTSHeader` |
| `traefik.<segment_name>.frontend.headers.frameDeny=false` | Same as `traefik.frontend.headers.frameDeny` |
| `traefik.<segment_name>.frontend.headers.hostsProxyHeaders=EXPR` | Same as `traefik.frontend.headers.hostsProxyHeaders` |
| `traefik.<segment_name>.frontend.headers.isDevelopment=false` | Same as `traefik.frontend.headers.isDevelopment` |
| `traefik.<segment_name>.frontend.headers.publicKey=VALUE` | Same as `traefik.frontend.headers.publicKey` |
| `traefik.<segment_name>.frontend.headers.referrerPolicy=VALUE` | Same as `traefik.frontend.headers.referrerPolicy` |
| `traefik.<segment_name>.frontend.headers.SSLRedirect=true` | Same as `traefik.frontend.headers.SSLRedirect` |
| `traefik.<segment_name>.frontend.headers.SSLTemporaryRedirect=true` | Same as `traefik.frontend.headers.SSLTemporaryRedirect` |
| `traefik.<segment_name>.frontend.headers.SSLHost=HOST` | Same as `traefik.frontend.headers.SSLHost` |
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| `traefik.<segment_name>.frontend.headers.SSLForceHost=true` | Same as `traefik.frontend.headers.SSLForceHost` |
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| `traefik.<segment_name>.frontend.headers.SSLProxyHeaders=EXPR` | Same as `traefik.frontend.headers.SSLProxyHeaders=EXPR` |
| `traefik.<segment_name>.frontend.headers.STSSeconds=315360000` | Same as `traefik.frontend.headers.STSSeconds=315360000` |
| `traefik.<segment_name>.frontend.headers.STSIncludeSubdomains=true` | Same as `traefik.frontend.headers.STSIncludeSubdomains=true` |
| `traefik.<segment_name>.frontend.headers.STSPreload=true` | Same as `traefik.frontend.headers.STSPreload=true` |
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!!! note
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If a label is defined both as a `container label` and a `segment label` (for example `traefik.<segment_name>.port=PORT` and `traefik.port=PORT` ), the `segment label` is used to defined the `<segment_name>` property (`port` in the example).
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It's possible to mix `container labels` and `segment labels` , in this case `container labels` are used as default value for missing `segment labels` but no frontends are going to be created with the `container labels` .
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More details in this [example ](/user-guide/docker-and-lets-encrypt/#labels ).
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!!! warning
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When running inside a container, Træfik will need network access through:
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`docker network connect <network> <traefik-container>`
