Ali Afsharzadeh 46c266661c

Add a status option to the service health check

2022-11-24 11:40:05 +01:00

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title	description
Traefik Consul Catalog Routing	Learn how to use Consul Catalog as a provider for routing configurations in Traefik Proxy. Read the technical documentation.

Traefik & Consul Catalog

A Story of Tags, Services & Instances {: .subtitle }

Attach tags to your services and let Traefik do the rest!

Routing Configuration

!!! info "tags"

- tags are case insensitive.
- The complete list of tags can be found [the reference page](../../reference/dynamic-configuration/consul-catalog.md)

General

Traefik creates, for each consul Catalog service, a corresponding service and router.

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.

Routers

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.

For example, to change the rule, you could add the tag traefik.http.routers.my-service.rule=Host(`example.com`).

??? info "traefik.http.routers.<router_name>.rule"

See [rule](../routers/index.md#rule) for more information.

```yaml
traefik.http.routers.myrouter.rule=Host(`example.com`)
```

??? info "traefik.http.routers.<router_name>.entrypoints"

See [entry points](../routers/index.md#entrypoints) for more information.

```yaml
traefik.http.routers.myrouter.entrypoints=web,websecure
```

??? info "traefik.http.routers.<router_name>.middlewares"

See [middlewares](../routers/index.md#middlewares) and [middlewares overview](../../middlewares/overview.md) for more information.

```yaml
traefik.http.routers.myrouter.middlewares=auth,prefix,cb
```

??? info "traefik.http.routers.<router_name>.service"

See [rule](../routers/index.md#service) for more information.

```yaml
traefik.http.routers.myrouter.service=myservice
```

??? info "traefik.http.routers.<router_name>.tls"

See [tls](../routers/index.md#tls) for more information.

```yaml
traefik.http.routers.myrouter.tls=true
```

??? info "traefik.http.routers.<router_name>.tls.certresolver"

See [certResolver](../routers/index.md#certresolver) for more information.

```yaml
traefik.http.routers.myrouter.tls.certresolver=myresolver
```

??? info "traefik.http.routers.<router_name>.tls.domains[n].main"

See [domains](../routers/index.md#domains) for more information.

```yaml
traefik.http.routers.myrouter.tls.domains[0].main=example.org
```

??? info "traefik.http.routers.<router_name>.tls.domains[n].sans"

See [domains](../routers/index.md#domains) for more information.

```yaml
traefik.http.routers.myrouter.tls.domains[0].sans=test.example.org,dev.example.org
```

??? info "traefik.http.routers.<router_name>.tls.options"

See [options](../routers/index.md#options) for more information.

```yaml
traefik.http.routers.myrouter.tls.options=foobar
```

??? info "traefik.http.routers.<router_name>.priority"

See [priority](../routers/index.md#priority) for more information.

```yaml
traefik.http.routers.myrouter.priority=42
```

Services

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.

For example, to change the passHostHeader behavior, you'd add the tag traefik.http.services.{name-of-your-choice}.loadbalancer.passhostheader=false.

??? info "traefik.http.services.<service_name>.loadbalancer.server.port"

Registers a port.
Useful when the service exposes multiples ports.

```yaml
traefik.http.services.myservice.loadbalancer.server.port=8080
```

??? info "traefik.http.services.<service_name>.loadbalancer.server.scheme"

Overrides the default scheme.

```yaml
traefik.http.services.myservice.loadbalancer.server.scheme=http
```

??? info "traefik.http.services.<service_name>.loadbalancer.serverstransport"

Allows to reference a ServersTransport resource that is defined either with the File provider or the Kubernetes CRD one.
See [serverstransport](../services/index.md#serverstransport) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.serverstransport=foobar@file
```

??? info "traefik.http.services.<service_name>.loadbalancer.passhostheader"

See [pass Host header](../services/index.md#pass-host-header) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.passhostheader=true
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.headers.<header_name>"

See [health check](../services/index.md#health-check) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.healthcheck.headers.X-Foo=foobar
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.hostname"

See [health check](../services/index.md#health-check) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.healthcheck.hostname=example.org
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.interval"

See [health check](../services/index.md#health-check) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.healthcheck.interval=10
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.path"

See [health check](../services/index.md#health-check) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.healthcheck.path=/foo
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.method"

See [health check](../services/index.md#health-check) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.healthcheck.method=foobar
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.status"

See [health check](../services/index.md#health-check) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.healthcheck.status=42
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.port"

See [health check](../services/index.md#health-check) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.healthcheck.port=42
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.scheme"

See [health check](../services/index.md#health-check) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.healthcheck.scheme=http
```

??? info "traefik.http.services.<service_name>.loadbalancer.healthcheck.timeout"

See [health check](../services/index.md#health-check) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.healthcheck.timeout=10
```

??? 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
```

??? info "traefik.http.services.<service_name>.loadbalancer.sticky.cookie"

See [sticky sessions](../services/index.md#sticky-sessions) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.sticky.cookie=true
```

??? info "traefik.http.services.<service_name>.loadbalancer.sticky.cookie.httponly"

See [sticky sessions](../services/index.md#sticky-sessions) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.sticky.cookie.httponly=true
```

??? info "traefik.http.services.<service_name>.loadbalancer.sticky.cookie.name"

See [sticky sessions](../services/index.md#sticky-sessions) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.sticky.cookie.name=foobar
```

??? info "traefik.http.services.<service_name>.loadbalancer.sticky.cookie.secure"

See [sticky sessions](../services/index.md#sticky-sessions) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.sticky.cookie.secure=true
```

??? info "traefik.http.services.<service_name>.loadbalancer.sticky.cookie.samesite"

See [sticky sessions](../services/index.md#sticky-sessions) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.sticky.cookie.samesite=none
```

??? info "traefik.http.services.<service_name>.loadbalancer.responseforwarding.flushinterval"

See [response forwarding](../services/index.md#response-forwarding) for more information.

```yaml
traefik.http.services.myservice.loadbalancer.responseforwarding.flushinterval=10
```

Middleware

You can declare pieces of middleware using tags starting with traefik.http.middlewares.{name-of-your-choice}., followed by the middleware type/options.

For example, to declare a middleware redirectscheme named my-redirect, you'd write traefik.http.middlewares.my-redirect.redirectscheme.scheme: https.

More information about available middlewares in the dedicated middlewares section.

??? example "Declaring and Referencing a Middleware"

```yaml
# ...
# Declaring a middleware
traefik.http.middlewares.my-redirect.redirectscheme.scheme=https
# Referencing a middleware
traefik.http.routers.my-service.middlewares=my-redirect
```

!!! warning "Conflicts in Declaration"

If you declare multiple middleware with the same name but with different parameters, the middleware fails to be declared.

TCP

You can declare TCP Routers and/or Services using tags.

??? example "Declaring TCP Routers and Services"

```yaml
traefik.tcp.routers.my-router.rule=HostSNI(`example.com`)
traefik.tcp.routers.my-router.tls=true
traefik.tcp.services.my-service.loadbalancer.server.port=4123
```

!!! 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).
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).

TCP Routers

??? info "traefik.tcp.routers.<router_name>.entrypoints"

See [entry points](../routers/index.md#entrypoints_1) for more information.

```yaml
traefik.tcp.routers.mytcprouter.entrypoints=ep1,ep2
```

??? info "traefik.tcp.routers.<router_name>.rule"

See [rule](../routers/index.md#rule_1) for more information.

```yaml
traefik.tcp.routers.mytcprouter.rule=HostSNI(`example.com`)
```

??? info "traefik.tcp.routers.<router_name>.service"

See [service](../routers/index.md#services) for more information.

```yaml
traefik.tcp.routers.mytcprouter.service=myservice
```

??? info "traefik.tcp.routers.<router_name>.tls"

See [TLS](../routers/index.md#tls_1) for more information.

```yaml
traefik.tcp.routers.mytcprouter.tls=true
```

??? info "traefik.tcp.routers.<router_name>.tls.certresolver"

See [certResolver](../routers/index.md#certresolver_1) for more information.

```yaml
traefik.tcp.routers.mytcprouter.tls.certresolver=myresolver
```

??? info "traefik.tcp.routers.<router_name>.tls.domains[n].main"

See [domains](../routers/index.md#domains_1) for more information.

```yaml
traefik.tcp.routers.mytcprouter.tls.domains[0].main=example.org
```

??? info "traefik.tcp.routers.<router_name>.tls.domains[n].sans"

See [domains](../routers/index.md#domains_1) for more information.

```yaml
traefik.tcp.routers.mytcprouter.tls.domains[0].sans=test.example.org,dev.example.org
```

??? info "traefik.tcp.routers.<router_name>.tls.options"

See [options](../routers/index.md#options_1) for more information.

```yaml
traefik.tcp.routers.mytcprouter.tls.options=mysoptions
```

??? info "traefik.tcp.routers.<router_name>.tls.passthrough"

See [TLS](../routers/index.md#tls_1) for more information.

```yaml
traefik.tcp.routers.mytcprouter.tls.passthrough=true
```

TCP Services

??? info "traefik.tcp.services.<service_name>.loadbalancer.server.port"

Registers a port of the application.

```yaml
traefik.tcp.services.mytcpservice.loadbalancer.server.port=423
```

??? info "traefik.tcp.services.<service_name>.loadbalancer.terminationdelay"

See [termination delay](../services/index.md#termination-delay) for more information.

```yaml
traefik.tcp.services.mytcpservice.loadbalancer.terminationdelay=100
```

??? info "traefik.tcp.services.<service_name>.loadbalancer.proxyprotocol.version"

See [PROXY protocol](../services/index.md#proxy-protocol) for more information.

```yaml
traefik.tcp.services.mytcpservice.loadbalancer.proxyprotocol.version=1
```

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
```

Specific Provider Options

`traefik.enable`

traefik.enable=true

You can tell Traefik to consider (or not) the service by setting traefik.enable to true or false.

This option overrides the value of exposedByDefault.

`traefik.consulcatalog.connect`

traefik.consulcatalog.connect=true

You can tell Traefik to consider (or not) the service as a Connect capable one by setting traefik.consulcatalog.connect to true or false.

This option overrides the value of connectByDefault.

`traefik.consulcatalog.canary`

traefik.consulcatalog.canary=true

When ConsulCatalog, in the context of a Nomad orchestrator, is a provider (of service registration) for Traefik, one might have the need to distinguish within Traefik between a Canary instance of a service, or a production one. For example if one does not want them to be part of the same load-balancer.

Therefore, this option, which is meant to be provided as one of the values of the canary_tags field in the Nomad service stanza, allows Traefik to identify that the associated instance is a canary one.

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.

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