# Docker Provider
Træfik can be configured to use Docker as a provider.
## Docker
```toml
################################################################
# Docker Provider
################################################################
# Enable Docker Provider.
[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"
# Enable watch docker changes.
#
# Optional
#
watch = true
# Override default configuration template.
# For advanced users :)
#
# Optional
#
# filename = "docker.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
# Expose containers by default in Traefik.
# If set to false, containers that don't have `traefik.enable=true` will be ignored.
#
# Optional
# Default: true
#
exposedByDefault = true
# Use the IP address from the binded port instead of the inner network one.
# For specific use-case :)
#
# Optional
# Default: false
#
usebindportip = true
# Use Swarm Mode services as data provider.
#
# Optional
# Default: false
#
swarmMode = false
# Define a default docker network to use for connections to all containers.
# Can be overridden by the traefik.docker.network label.
#
# Optional
#
network = "web"
# Enable docker TLS connection.
#
# Optional
#
# [docker.tls]
# ca = "/etc/ssl/ca.crt"
# cert = "/etc/ssl/docker.crt"
# key = "/etc/ssl/docker.key"
# insecureSkipVerify = true
```
To enable constraints see [provider-specific constraints section](/configuration/commons/#provider-specific).
## Docker Swarm Mode
```toml
################################################################
# Docker Swarm Mode Provider
################################################################
# Enable Docker Provider.
[docker]
# Docker server endpoint.
# Can be a tcp or a unix socket endpoint.
#
# 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"
# Enable watch docker changes.
#
# Optional
# Default: true
#
watch = true
# Use Docker Swarm Mode as data provider.
#
# Optional
# Default: false
#
swarmMode = true
# Define a default docker network to use for connections to all containers.
# Can be overridden by the traefik.docker.network label.
#
# Optional
#
network = "web"
# Override default configuration template.
# For advanced users :)
#
# Optional
#
# filename = "docker.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
# Expose services by default in Traefik.
#
# Optional
# Default: true
#
exposedByDefault = false
# Enable docker TLS connection.
#
# Optional
#
# [docker.tls]
# ca = "/etc/ssl/ca.crt"
# cert = "/etc/ssl/docker.crt"
# key = "/etc/ssl/docker.key"
# insecureSkipVerify = true
```
To enable constraints see [provider-specific constraints section](/configuration/commons/#provider-specific).
## Labels: overriding default behavior
### Using Docker with Swarm Mode
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)).
```yaml
version: "3"
services:
whoami:
deploy:
labels:
traefik.docker.network: traefik
```
### Using Docker Compose
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.
```yaml
version: "3"
services:
whoami:
labels:
traefik.docker.network: traefik
```
### On Containers
Labels can be used on containers to override default behavior.
| 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
Format: HEADER:value||HEADER2:value2 |
| `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.
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.
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). |
| `traefik.frontend.auth.basic.removeHeader=true` | If set to `true`, removes the `Authorization` header. |
| `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. |
| `traefik.frontend.auth.digest.removeHeader=true` | If set to `true`, removes the `Authorization` header. |
| `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`.
Overrides `defaultEntryPoints` |
| `traefik.frontend.errors..backend=NAME` | See [custom error pages](/configuration/commons/#custom-error-pages) section. |
| `traefik.frontend.errors..query=PATH` | See [custom error pages](/configuration/commons/#custom-error-pages) section. |
| `traefik.frontend.errors..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..period=6` | See [rate limiting](/configuration/commons/#rate-limiting) section. |
| `traefik.frontend.rateLimit.rateSet..average=6` | See [rate limiting](/configuration/commons/#rate-limiting) section. |
| `traefik.frontend.rateLimit.rateSet..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.
Must be set with `traefik.frontend.redirect.replacement`. |
| `traefik.frontend.redirect.replacement=http://mydomain/$1` | Redirects to another URL to this frontend.
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.
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. |
| `traefik.frontend.whiteList.useXForwardedFor=true` | Uses `X-Forwarded-For` header as valid source of IP for the white list. |
[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 `) 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.
[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`.
The result will be `user:$$apr1$$9Cv/OMGj$$ZomWQzuQbL.3TRCS81A1g/`, note additional symbol `$` makes escaping.
#### 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.
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 |
#### 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.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`. |
| `traefik.frontend.headers.hostsProxyHeaders=EXPR ` | Provides a list of headers that the proxied hostname may be stored.
Format: `HEADER1,HEADER2` |
| `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. |
| `traefik.frontend.headers.publicKey=VALUE` | Adds pinned HTST public key header. |
| `traefik.frontend.headers.referrerPolicy=VALUE` | Adds referrer policy header. |
| `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.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. |
| `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. |
### 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.
Segment labels override the default behavior.
| Label | Description |
|---------------------------------------------------------------------------|---------------------------------------------------------------|
| `traefik..backend=BACKEND` | Same as `traefik.backend` |
| `traefik..domain=DOMAIN` | Same as `traefik.domain` |
| `traefik..port=PORT` | Same as `traefik.port` |
| `traefik..protocol=http` | Same as `traefik.protocol` |
| `traefik..weight=10` | Same as `traefik.weight` |
| `traefik..frontend.auth.basic=EXPR` | Same as `traefik.frontend.auth.basic` |
| `traefik..frontend.auth.basic.removeHeader=true` | Same as `traefik.frontend.auth.basic.removeHeader` |
| `traefik..frontend.auth.basic.users=EXPR` | Same as `traefik.frontend.auth.basic.users` |
| `traefik..frontend.auth.basic.usersFile=/path/.htpasswd` | Same as `traefik.frontend.auth.basic.usersFile` |
| `traefik..frontend.auth.digest.removeHeader=true` | Same as `traefik.frontend.auth.digest.removeHeader` |
| `traefik..frontend.auth.digest.users=EXPR` | Same as `traefik.frontend.auth.digest.users` |
| `traefik..frontend.auth.digest.usersFile=/path/.htdigest` | Same as `traefik.frontend.auth.digest.usersFile` |
| `traefik..frontend.auth.forward.address=https://example.com`| Same as `traefik.frontend.auth.forward.address` |
| `traefik..frontend.auth.forward.tls.ca=/path/ca.pem` | Same as `traefik.frontend.auth.forward.tls.ca` |
| `traefik..frontend.auth.forward.tls.caOptional=true` | Same as `traefik.frontend.auth.forward.tls.caOptional` |
| `traefik..frontend.auth.forward.tls.cert=/path/server.pem` | Same as `traefik.frontend.auth.forward.tls.cert` |
| `traefik..frontend.auth.forward.tls.insecureSkipVerify=true`| Same as `traefik.frontend.auth.forward.tls.insecureSkipVerify`|
| `traefik..frontend.auth.forward.tls.key=/path/server.key` | Same as `traefik.frontend.auth.forward.tls.key` |
| `traefik..frontend.auth.forward.trustForwardHeader=true` | Same as `traefik.frontend.auth.forward.trustForwardHeader` |
| `traefik..frontend.auth.headerField=X-WebAuth-User` | Same as `traefik.frontend.auth.headerField` |
| `traefik..frontend.entryPoints=https` | Same as `traefik.frontend.entryPoints` |
| `traefik..frontend.errors..backend=NAME` | Same as `traefik.frontend.errors..backend` |
| `traefik..frontend.errors..query=PATH` | Same as `traefik.frontend.errors..query` |
| `traefik..frontend.errors..status=RANGE` | Same as `traefik.frontend.errors..status` |
| `traefik..frontend.passHostHeader=true` | Same as `traefik.frontend.passHostHeader` |
| `traefik..frontend.passTLSCert=true` | Same as `traefik.frontend.passTLSCert` |
| `traefik..frontend.priority=10` | Same as `traefik.frontend.priority` |
| `traefik..frontend.rateLimit.extractorFunc=EXP` | Same as `traefik.frontend.rateLimit.extractorFunc` |
| `traefik..frontend.rateLimit.rateSet..period=6` | Same as `traefik.frontend.rateLimit.rateSet..period` |
| `traefik..frontend.rateLimit.rateSet..average=6` | Same as `traefik.frontend.rateLimit.rateSet..average` |
| `traefik..frontend.rateLimit.rateSet..burst=6` | Same as `traefik.frontend.rateLimit.rateSet..burst` |
| `traefik..frontend.redirect.entryPoint=https` | Same as `traefik.frontend.redirect.entryPoint` |
| `traefik..frontend.redirect.regex=^http://localhost/(.*)` | Same as `traefik.frontend.redirect.regex` |
| `traefik..frontend.redirect.replacement=http://mydomain/$1` | Same as `traefik.frontend.redirect.replacement` |
| `traefik..frontend.redirect.permanent=true` | Same as `traefik.frontend.redirect.permanent` |
| `traefik..frontend.rule=EXP` | Same as `traefik.frontend.rule` |
| `traefik..frontend.whiteList.sourceRange=RANGE` | Same as `traefik.frontend.whiteList.sourceRange` |
| `traefik..frontend.whiteList.useXForwardedFor=true` | Same as `traefik.frontend.whiteList.useXForwardedFor` |
#### Custom Headers
| Label | Description |
|----------------------------------------------------------------------|----------------------------------------------------------|
| `traefik..frontend.headers.customRequestHeaders=EXPR ` | Same as `traefik.frontend.headers.customRequestHeaders` |
| `traefik..frontend.headers.customResponseHeaders=EXPR` | Same as `traefik.frontend.headers.customResponseHeaders` |
#### Security Headers
| Label | Description |
|-------------------------------------------------------------------------|--------------------------------------------------------------|
| `traefik..frontend.headers.allowedHosts=EXPR` | Same as `traefik.frontend.headers.allowedHosts` |
| `traefik..frontend.headers.browserXSSFilter=true` | Same as `traefik.frontend.headers.browserXSSFilter` |
| `traefik..frontend.headers.contentSecurityPolicy=VALUE` | Same as `traefik.frontend.headers.contentSecurityPolicy` |
| `traefik..frontend.headers.contentTypeNosniff=true` | Same as `traefik.frontend.headers.contentTypeNosniff` |
| `traefik..frontend.headers.customBrowserXSSValue=VALUE` | Same as `traefik.frontend.headers.customBrowserXSSValue` |
| `traefik..frontend.headers.customFrameOptionsValue=VALUE` | Same as `traefik.frontend.headers.customFrameOptionsValue` |
| `traefik..frontend.headers.forceSTSHeader=false` | Same as `traefik.frontend.headers.forceSTSHeader` |
| `traefik..frontend.headers.frameDeny=false` | Same as `traefik.frontend.headers.frameDeny` |
| `traefik..frontend.headers.hostsProxyHeaders=EXPR` | Same as `traefik.frontend.headers.hostsProxyHeaders` |
| `traefik..frontend.headers.isDevelopment=false` | Same as `traefik.frontend.headers.isDevelopment` |
| `traefik..frontend.headers.publicKey=VALUE` | Same as `traefik.frontend.headers.publicKey` |
| `traefik..frontend.headers.referrerPolicy=VALUE` | Same as `traefik.frontend.headers.referrerPolicy` |
| `traefik..frontend.headers.SSLRedirect=true` | Same as `traefik.frontend.headers.SSLRedirect` |
| `traefik..frontend.headers.SSLTemporaryRedirect=true` | Same as `traefik.frontend.headers.SSLTemporaryRedirect` |
| `traefik..frontend.headers.SSLHost=HOST` | Same as `traefik.frontend.headers.SSLHost` |
| `traefik..frontend.headers.SSLForceHost=true` | Same as `traefik.frontend.headers.SSLForceHost` |
| `traefik..frontend.headers.SSLProxyHeaders=EXPR` | Same as `traefik.frontend.headers.SSLProxyHeaders=EXPR` |
| `traefik..frontend.headers.STSSeconds=315360000` | Same as `traefik.frontend.headers.STSSeconds=315360000` |
| `traefik..frontend.headers.STSIncludeSubdomains=true` | Same as `traefik.frontend.headers.STSIncludeSubdomains=true` |
| `traefik..frontend.headers.STSPreload=true` | Same as `traefik.frontend.headers.STSPreload=true` |
!!! note
If a label is defined both as a `container label` and a `segment label` (for example `traefik..port=PORT` and `traefik.port=PORT` ), the `segment label` is used to defined the `` property (`port` in the example).
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`.
More details in this [example](/user-guide/docker-and-lets-encrypt/#labels).
!!! warning
When running inside a container, Træfik will need network access through:
`docker network connect `