traefik/docs/content/routing/providers/consul-catalog.md

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# Traefik & Consul Catalog
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A Story of Tags, Services & Instances
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{: .subtitle }
![Rancher](../../assets/img/providers/consul.png)
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Attach tags to your services and let Traefik do the rest!
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## Routing Configuration
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!!! info "tags"
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- tags are case insensitive.
- The complete list of tags can be found [the reference page](../../reference/dynamic-configuration/consul-catalog.md)
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### General
Traefik creates, for each consul Catalog service, a corresponding [service](../services/index.md) and [router](../routers/index.md).
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The Service automatically gets a server per instance in this consul Catalog service, and the router gets a default rule attached to it, based on the service name.
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### Routers
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To update the configuration of the Router automatically attached to the service, add tags starting with `traefik.routers.{name-of-your-choice}.` and followed by the option you want to change.
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For example, to change the rule, you could add the tag ```traefik.http.routers.my-service.rule=Host(`mydomain.com`)```.
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??? info "`traefik.http.routers.<router_name>.rule`"
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See [rule](../routers/index.md#rule) for more information.
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```yaml
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traefik.http.routers.myrouter.rule=Host(`mydomain.com`)
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```
??? info "`traefik.http.routers.<router_name>.entrypoints`"
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See [entry points](../routers/index.md#entrypoints) for more information.
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```yaml
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traefik.http.routers.myrouter.entrypoints=web,websecure
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```
??? info "`traefik.http.routers.<router_name>.middlewares`"
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See [middlewares](../routers/index.md#middlewares) and [middlewares overview](../../middlewares/overview.md) for more information.
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```yaml
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traefik.http.routers.myrouter.middlewares=auth,prefix,cb
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```
??? info "`traefik.http.routers.<router_name>.service`"
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See [rule](../routers/index.md#service) for more information.
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```yaml
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traefik.http.routers.myrouter.service=myservice
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```
??? info "`traefik.http.routers.<router_name>.tls`"
See [tls](../routers/index.md#tls) for more information.
```yaml
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traefik.http.routers.myrouter>.tls=true
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```
??? info "`traefik.http.routers.<router_name>.tls.certresolver`"
See [certResolver](../routers/index.md#certresolver) for more information.
```yaml
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traefik.http.routers.myrouter.tls.certresolver=myresolver
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```
??? info "`traefik.http.routers.<router_name>.tls.domains[n].main`"
See [domains](../routers/index.md#domains) for more information.
```yaml
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traefik.http.routers.myrouter.tls.domains[0].main=foobar.com
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```
??? info "`traefik.http.routers.<router_name>.tls.domains[n].sans`"
See [domains](../routers/index.md#domains) for more information.
```yaml
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traefik.http.routers.myrouter.tls.domains[0].sans=test.foobar.com,dev.foobar.com
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```
??? info "`traefik.http.routers.<router_name>.tls.options`"
See [options](../routers/index.md#options) for more information.
```yaml
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traefik.http.routers.myrouter.tls.options=foobar
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```
??? info "`traefik.http.routers.<router_name>.priority`"
<!-- TODO doc priority in routers page -->
```yaml
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traefik.http.routers.myrouter.priority=42
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```
### Services
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To update the configuration of the Service automatically attached to the service,
add tags starting with `traefik.http.services.{name-of-your-choice}.`, followed by the option you want to change.
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For example, to change the `passHostHeader` behavior,
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you'd add the tag `traefik.http.services.{name-of-your-choice}.loadbalancer.passhostheader=false`.
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??? info "`traefik.http.services.<service_name>.loadbalancer.server.port`"
Registers a port.
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Useful when the service exposes multiples ports.
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```yaml
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traefik.http.services.myservice.loadbalancer.server.port=8080
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```
??? info "`traefik.http.services.<service_name>.loadbalancer.server.scheme`"
Overrides the default scheme.
```yaml
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traefik.http.services.myservice.loadbalancer.server.scheme=http
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```
??? info "`traefik.http.services.<service_name>.loadbalancer.passhostheader`"
<!-- TODO doc passHostHeader in services page -->
```yaml
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traefik.http.services.myservice.loadbalancer.passhostheader=true
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```
??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.headers.<header_name>`"
See [health check](../services/index.md#health-check) for more information.
```yaml
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traefik.http.services.myservice.loadbalancer.healthcheck.headers.X-Foo=foobar
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```
??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.hostname`"
See [health check](../services/index.md#health-check) for more information.
```yaml
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traefik.http.services.myservice.loadbalancer.healthcheck.hostname=foobar.com
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```
??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.interval`"
See [health check](../services/index.md#health-check) for more information.
```yaml
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traefik.http.services.myservice.loadbalancer.healthcheck.interval=10
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```
??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.path`"
See [health check](../services/index.md#health-check) for more information.
```yaml
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traefik.http.services.myservice.loadbalancer.healthcheck.path=/foo
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```
??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.port`"
See [health check](../services/index.md#health-check) for more information.
```yaml
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traefik.http.services.myservice.loadbalancer.healthcheck.port=42
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```
??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.scheme`"
See [health check](../services/index.md#health-check) for more information.
```yaml
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traefik.http.services.myservice.loadbalancer.healthcheck.scheme=http
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```
??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.timeout`"
See [health check](../services/index.md#health-check) for more information.
```yaml
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traefik.http.services.myservice.loadbalancer.healthcheck.timeout=10
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```
??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.followredirects`"
See [health check](../services/index.md#health-check) for more information.
```yaml
traefik.http.services.myservice.loadbalancer.healthcheck.followredirects=true
```
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??? info "`traefik.http.services.<service_name>.loadbalancer.sticky`"
See [sticky sessions](../services/index.md#sticky-sessions) for more information.
```yaml
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traefik.http.services.myservice.loadbalancer.sticky=true
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```
??? info "`traefik.http.services.<service_name>.loadbalancer.sticky.cookie.httponly`"
See [sticky sessions](../services/index.md#sticky-sessions) for more information.
```yaml
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traefik.http.services.myservice.loadbalancer.sticky.cookie.httponly=true
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```
??? info "`traefik.http.services.<service_name>.loadbalancer.sticky.cookie.name`"
See [sticky sessions](../services/index.md#sticky-sessions) for more information.
```yaml
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traefik.http.services.myservice.loadbalancer.sticky.cookie.name=foobar
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```
??? info "`traefik.http.services.<service_name>.loadbalancer.sticky.cookie.secure`"
See [sticky sessions](../services/index.md#sticky-sessions) for more information.
```yaml
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traefik.http.services.myservice.loadbalancer.sticky.cookie.secure=true
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```
??? info "`traefik.http.services.<service_name>.loadbalancer.responseforwarding.flushinterval`"
<!-- TODO doc responseforwarding in services page -->
FlushInterval specifies the flush interval to flush to the client while copying the response body.
```yaml
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traefik.http.services.myservice.loadbalancer.responseforwarding.flushinterval=10
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```
### Middleware
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You can declare pieces of middleware using tags starting with `traefik.http.middlewares.{name-of-your-choice}.`, followed by the middleware type/options.
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For example, to declare a middleware [`redirectscheme`](../../middlewares/redirectscheme.md) named `my-redirect`, you'd write `traefik.http.middlewares.my-redirect.redirectscheme.scheme: https`.
More information about available middlewares in the dedicated [middlewares section](../../middlewares/overview.md).
??? example "Declaring and Referencing a Middleware"
```yaml
# ...
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# Declaring a middleware
traefik.http.middlewares.my-redirect.redirectscheme.scheme=https
# Referencing a middleware
traefik.http.routers.my-service.middlewares=my-redirect
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```
!!! warning "Conflicts in Declaration"
If you declare multiple middleware with the same name but with different parameters, the middleware fails to be declared.
### TCP
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You can declare TCP Routers and/or Services using tags.
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??? example "Declaring TCP Routers and Services"
```yaml
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traefik.tcp.routers.my-router.rule=HostSNI(`my-host.com`)
traefik.tcp.routers.my-router.tls=true
traefik.tcp.services.my-service.loadbalancer.server.port=4123
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```
!!! warning "TCP and HTTP"
If you declare a TCP Router/Service, it will prevent Traefik from automatically creating an HTTP Router/Service (like it does by default if no TCP Router/Service is defined).
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You can declare both a TCP Router/Service and an HTTP Router/Service for the same consul service (but you have to do so manually).
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#### TCP Routers
??? info "`traefik.tcp.routers.<router_name>.entrypoints`"
See [entry points](../routers/index.md#entrypoints_1) for more information.
```yaml
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traefik.tcp.routers.mytcprouter.entrypoints=ep1,ep2
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```
??? info "`traefik.tcp.routers.<router_name>.rule`"
See [rule](../routers/index.md#rule_1) for more information.
```yaml
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traefik.tcp.routers.mytcprouter.rule=HostSNI(`myhost.com`)
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```
??? info "`traefik.tcp.routers.<router_name>.service`"
See [service](../routers/index.md#services) for more information.
```yaml
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traefik.tcp.routers.mytcprouter.service=myservice
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```
??? info "`traefik.tcp.routers.<router_name>.tls`"
See [TLS](../routers/index.md#tls_1) for more information.
```yaml
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traefik.tcp.routers.mytcprouter.tls=true
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```
??? info "`traefik.tcp.routers.<router_name>.tls.certresolver`"
See [certResolver](../routers/index.md#certresolver_1) for more information.
```yaml
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traefik.tcp.routers.mytcprouter.tls.certresolver=myresolver
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```
??? info "`traefik.tcp.routers.<router_name>.tls.domains[n].main`"
See [domains](../routers/index.md#domains_1) for more information.
```yaml
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traefik.tcp.routers.mytcprouter.tls.domains[0].main=foobar.com
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```
??? info "`traefik.tcp.routers.<router_name>.tls.domains[n].sans`"
See [domains](../routers/index.md#domains_1) for more information.
```yaml
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traefik.tcp.routers.mytcprouter.tls.domains[0].sans=test.foobar.com,dev.foobar.com
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```
??? info "`traefik.tcp.routers.<router_name>.tls.options`"
See [options](../routers/index.md#options_1) for more information.
```yaml
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traefik.tcp.routers.mytcprouter.tls.options=mysoptions
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```
??? info "`traefik.tcp.routers.<router_name>.tls.passthrough`"
See [TLS](../routers/index.md#tls_1) for more information.
```yaml
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traefik.tcp.routers.mytcprouter.tls.passthrough=true
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```
#### TCP Services
??? info "`traefik.tcp.services.<service_name>.loadbalancer.server.port`"
Registers a port of the application.
```yaml
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traefik.tcp.services.mytcpservice.loadbalancer.server.port=423
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```
??? info "`traefik.tcp.services.<service_name>.loadbalancer.terminationdelay`"
See [termination delay](../services/index.md#termination-delay) for more information.
```yaml
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traefik.tcp.services.mytcpservice.loadbalancer.terminationdelay=100
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```
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### UDP
You can declare UDP Routers and/or Services using tags.
??? example "Declaring UDP Routers and Services"
```yaml
traefik.udp.routers.my-router.entrypoints=udp
traefik.udp.services.my-service.loadbalancer.server.port=4123
```
!!! warning "UDP and HTTP"
If you declare a UDP Router/Service, it will prevent Traefik from automatically creating an HTTP Router/Service (like it does by default if no UDP Router/Service is defined).
You can declare both a UDP Router/Service and an HTTP Router/Service for the same consul service (but you have to do so manually).
#### UDP Routers
??? info "`traefik.udp.routers.<router_name>.entrypoints`"
See [entry points](../routers/index.md#entrypoints_2) for more information.
```yaml
traefik.udp.routers.myudprouter.entrypoints=ep1,ep2
```
??? info "`traefik.udp.routers.<router_name>.service`"
See [service](../routers/index.md#services_1) for more information.
```yaml
traefik.udp.routers.myudprouter.service=myservice
```
#### UDP Services
??? info "`traefik.udp.services.<service_name>.loadbalancer.server.port`"
Registers a port of the application.
```yaml
traefik.udp.services.myudpservice.loadbalancer.server.port=423
```
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### Specific Provider Options
#### `traefik.enable`
```yaml
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traefik.enable=true
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```
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You can tell Traefik to consider (or not) the service by setting `traefik.enable` to true or false.
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This option overrides the value of `exposedByDefault`.
#### Port Lookup
Traefik is capable of detecting the port to use, by following the default consul Catalog flow.
That means, if you just expose lets say port `:1337` on the consul Catalog ui, traefik will pick up this port and use it.