740 lines
15 KiB
Markdown
740 lines
15 KiB
Markdown
---
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title: "Consul Catalog Configuration Discovery"
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description: "Learn how to use Consul Catalog as a provider for configuration discovery in Traefik Proxy. Read the technical documentation."
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---
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# Traefik & Consul Catalog
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A Story of Tags, Services & Instances
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{: .subtitle }
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Attach tags to your services and let Traefik do the rest!
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## Configuration Examples
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??? example "Configuring Consul Catalog & Deploying / Exposing Services"
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Enabling the consul catalog provider
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```yaml tab="File (YAML)"
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providers:
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consulCatalog: {}
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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```
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```bash tab="CLI"
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--providers.consulcatalog=true
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```
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Attaching tags to services
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```yaml
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- traefik.http.routers.my-router.rule=Host(`example.com`)
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```
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## Routing Configuration
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See the dedicated section in [routing](../routing/providers/consul-catalog.md).
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## Provider Configuration
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### `refreshInterval`
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_Optional, Default=15s_
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Defines the polling interval.
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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refreshInterval: 30s
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# ...
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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refreshInterval = "30s"
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# ...
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```
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```bash tab="CLI"
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--providers.consulcatalog.refreshInterval=30s
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# ...
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```
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### `prefix`
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_required, Default="traefik"_
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The prefix for Consul Catalog tags defining Traefik labels.
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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prefix: test
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# ...
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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prefix = "test"
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# ...
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```
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```bash tab="CLI"
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--providers.consulcatalog.prefix=test
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# ...
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```
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### `requireConsistent`
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_Optional, Default=false_
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Forces the read to be fully consistent.
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!!! note ""
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It is more expensive due to an extra round-trip but prevents ever performing a stale read.
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For more information, see the consul [documentation on consistency](https://www.consul.io/api-docs/features/consistency).
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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requireConsistent: true
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# ...
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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requireConsistent = true
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# ...
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```
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```bash tab="CLI"
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--providers.consulcatalog.requireConsistent=true
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# ...
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```
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### `stale`
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_Optional, Default=false_
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Use stale consistency for catalog reads.
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!!! note ""
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This makes reads very fast and scalable at the cost of a higher likelihood of stale values.
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For more information, see the consul [documentation on consistency](https://www.consul.io/api-docs/features/consistency).
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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stale: true
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# ...
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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stale = true
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# ...
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```
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```bash tab="CLI"
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--providers.consulcatalog.stale=true
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# ...
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```
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### `cache`
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_Optional, Default=false_
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Use local agent caching for catalog reads.
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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cache: true
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# ...
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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cache = true
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# ...
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```
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```bash tab="CLI"
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--providers.consulcatalog.cache=true
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# ...
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```
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### `endpoint`
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Defines the Consul server endpoint.
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#### `address`
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Defines the address of the Consul server.
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_Optional, Default="127.0.0.1:8500"_
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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endpoint:
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address: 127.0.0.1:8500
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# ...
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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[providers.consulCatalog.endpoint]
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address = "127.0.0.1:8500"
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# ...
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```
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```bash tab="CLI"
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--providers.consulcatalog.endpoint.address=127.0.0.1:8500
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# ...
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```
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#### `scheme`
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_Optional, Default=""_
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Defines the URI scheme for the Consul server.
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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endpoint:
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scheme: https
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# ...
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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[providers.consulCatalog.endpoint]
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scheme = "https"
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# ...
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```
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```bash tab="CLI"
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--providers.consulcatalog.endpoint.scheme=https
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# ...
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```
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#### `datacenter`
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_Optional, Default=""_
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Defines the datacenter to use.
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If not provided in Traefik, Consul uses the default agent datacenter.
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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endpoint:
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datacenter: test
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# ...
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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[providers.consulCatalog.endpoint]
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datacenter = "test"
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# ...
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```
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```bash tab="CLI"
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--providers.consulcatalog.endpoint.datacenter=test
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# ...
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```
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#### `token`
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_Optional, Default=""_
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Token is used to provide a per-request ACL token which overwrites the agent's default token.
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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endpoint:
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token: test
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# ...
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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[providers.consulCatalog.endpoint]
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token = "test"
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# ...
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```
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```bash tab="CLI"
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--providers.consulcatalog.endpoint.token=test
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# ...
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```
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#### `endpointWaitTime`
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_Optional, Default=""_
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Limits the duration for which a Watch can block.
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If not provided, the agent default values will be used.
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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endpoint:
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endpointWaitTime: 15s
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# ...
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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[providers.consulCatalog.endpoint]
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endpointWaitTime = "15s"
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# ...
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```
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```bash tab="CLI"
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--providers.consulcatalog.endpoint.endpointwaittime=15s
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# ...
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```
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#### `httpAuth`
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_Optional_
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Used to authenticate the HTTP client using HTTP Basic Authentication.
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##### `username`
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_Optional, Default=""_
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Username to use for HTTP Basic Authentication.
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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endpoint:
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httpAuth:
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username: test
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog.endpoint.httpAuth]
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username = "test"
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```
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```bash tab="CLI"
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--providers.consulcatalog.endpoint.httpauth.username=test
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```
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##### `password`
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_Optional, Default=""_
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Password to use for HTTP Basic Authentication.
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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endpoint:
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httpAuth:
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password: test
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog.endpoint.httpAuth]
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password = "test"
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```
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```bash tab="CLI"
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--providers.consulcatalog.endpoint.httpauth.password=test
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```
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#### `tls`
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_Optional_
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Defines the TLS configuration used for the secure connection to Consul Catalog.
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##### `ca`
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_Optional_
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`ca` is the path to the certificate authority used for the secure connection to Consul Catalog,
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it defaults to the system bundle.
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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endpoint:
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tls:
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ca: path/to/ca.crt
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog.endpoint.tls]
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ca = "path/to/ca.crt"
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```
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```bash tab="CLI"
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--providers.consulcatalog.endpoint.tls.ca=path/to/ca.crt
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```
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##### `cert`
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_Optional_
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`cert` is the path to the public certificate used for the secure connection to Consul Catalog.
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When using this option, setting the `key` option is required.
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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endpoint:
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tls:
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cert: path/to/foo.cert
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key: path/to/foo.key
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog.endpoint.tls]
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cert = "path/to/foo.cert"
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key = "path/to/foo.key"
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```
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```bash tab="CLI"
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--providers.consulcatalog.endpoint.tls.cert=path/to/foo.cert
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--providers.consulcatalog.endpoint.tls.key=path/to/foo.key
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```
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##### `key`
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_Optional_
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`key` is the path to the private key used for the secure connection to Consul Catalog.
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When using this option, setting the `cert` option is required.
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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endpoint:
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tls:
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cert: path/to/foo.cert
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key: path/to/foo.key
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog.endpoint.tls]
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cert = "path/to/foo.cert"
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key = "path/to/foo.key"
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```
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```bash tab="CLI"
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--providers.consulcatalog.endpoint.tls.cert=path/to/foo.cert
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--providers.consulcatalog.endpoint.tls.key=path/to/foo.key
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```
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##### `insecureSkipVerify`
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_Optional, Default=false_
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If `insecureSkipVerify` is `true`, the TLS connection to Consul accepts any certificate presented by the server regardless of the hostnames it covers.
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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endpoint:
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tls:
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insecureSkipVerify: true
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog.endpoint.tls]
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insecureSkipVerify = true
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```
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```bash tab="CLI"
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--providers.consulcatalog.endpoint.tls.insecureskipverify=true
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```
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### `exposedByDefault`
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_Optional, Default=true_
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Expose Consul Catalog services by default in Traefik.
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If set to `false`, services that don't have a `traefik.enable=true` tag will be ignored from the resulting routing configuration.
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For additional information, refer to [Restrict the Scope of Service Discovery](./overview.md#restrict-the-scope-of-service-discovery).
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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exposedByDefault: false
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# ...
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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exposedByDefault = false
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# ...
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```
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```bash tab="CLI"
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--providers.consulcatalog.exposedByDefault=false
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# ...
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```
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### `defaultRule`
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_Optional, Default=```Host(`{{ normalize .Name }}`)```_
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The default host rule for all services.
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For a given service, if no routing rule was defined by a tag, it is defined by this `defaultRule` instead.
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The `defaultRule` must be set to a valid [Go template](https://pkg.go.dev/text/template/),
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and can include [sprig template functions](https://masterminds.github.io/sprig/).
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The service name can be accessed with the `Name` identifier,
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and the template has access to all the labels (i.e. tags beginning with the `prefix`) defined on this service.
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The option can be overridden on an instance basis with the `traefik.http.routers.{name-of-your-choice}.rule` tag.
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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defaultRule: "Host(`{{ .Name }}.{{ index .Labels \"customLabel\"}}`)"
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# ...
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```
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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defaultRule = "Host(`{{ .Name }}.{{ index .Labels \"customLabel\"}}`)"
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# ...
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```
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```bash tab="CLI"
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--providers.consulcatalog.defaultRule=Host(`{{ .Name }}.{{ index .Labels \"customLabel\"}}`)
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# ...
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```
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??? info "Default rule and Traefik service"
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The exposure of the Traefik container, combined with the default rule mechanism,
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can lead to create a router targeting itself in a loop.
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In this case, to prevent an infinite loop,
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Traefik adds an internal middleware to refuse the request if it comes from the same router.
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### `connectAware`
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_Optional, Default=false_
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Enable Consul Connect support.
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If set to `true`, Traefik will be enabled to communicate with Connect services.
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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connectAware = true
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# ...
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```
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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connectAware: true
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# ...
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```
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```bash tab="CLI"
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--providers.consulcatalog.connectAware=true
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# ...
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```
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### `connectByDefault`
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_Optional, Default=false_
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Consider every service as Connect capable by default.
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If set to `true`, Traefik will consider every Consul Catalog service to be Connect capable by default.
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The option can be overridden on an instance basis with the `traefik.consulcatalog.connect` tag.
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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connectByDefault = true
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# ...
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```
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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connectByDefault: true
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# ...
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```
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```bash tab="CLI"
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--providers.consulcatalog.connectByDefault=true
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# ...
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```
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### `serviceName`
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_Optional, Default="traefik"_
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Name of the Traefik service in Consul Catalog.
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```toml tab="File (TOML)"
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[providers.consulCatalog]
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serviceName = "test"
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# ...
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```
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```yaml tab="File (YAML)"
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providers:
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consulCatalog:
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serviceName: test
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# ...
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```
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```bash tab="CLI"
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--providers.consulcatalog.serviceName=test
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# ...
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```
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### `constraints`
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_Optional, Default=""_
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The `constraints` option can be set to an expression that Traefik matches against the service tags to determine whether
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to create any route for that service. If none of the service tags match the expression, no route for that service is
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created. If the expression is empty, all detected services are included.
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The expression syntax is based on the ```Tag(`tag`)```, and ```TagRegex(`tag`)``` functions,
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as well as the usual boolean logic, as shown in examples below.
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??? example "Constraints Expression Examples"
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|
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```toml
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# Includes only services having the tag `a.tag.name=foo`
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constraints = "Tag(`a.tag.name=foo`)"
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```
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|
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```toml
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# Excludes services having any tag `a.tag.name=foo`
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constraints = "!Tag(`a.tag.name=foo`)"
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```
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|
```toml
|
|
# With logical AND.
|
|
constraints = "Tag(`a.tag.name`) && Tag(`another.tag.name`)"
|
|
```
|
|
|
|
```toml
|
|
# With logical OR.
|
|
constraints = "Tag(`a.tag.name`) || Tag(`another.tag.name`)"
|
|
```
|
|
|
|
```toml
|
|
# With logical AND and OR, with precedence set by parentheses.
|
|
constraints = "Tag(`a.tag.name`) && (Tag(`another.tag.name`) || Tag(`yet.another.tag.name`))"
|
|
```
|
|
|
|
```toml
|
|
# Includes only services having a tag matching the `a\.tag\.t.+` regular expression.
|
|
constraints = "TagRegex(`a\.tag\.t.+`)"
|
|
```
|
|
|
|
```yaml tab="File (YAML)"
|
|
providers:
|
|
consulCatalog:
|
|
constraints: "Tag(`a.tag.name`)"
|
|
# ...
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
[providers.consulCatalog]
|
|
constraints = "Tag(`a.tag.name`)"
|
|
# ...
|
|
```
|
|
|
|
```bash tab="CLI"
|
|
--providers.consulcatalog.constraints="Tag(`a.tag.name`)"
|
|
# ...
|
|
```
|
|
|
|
For additional information, refer to [Restrict the Scope of Service Discovery](./overview.md#restrict-the-scope-of-service-discovery).
|
|
|
|
### `namespaces`
|
|
|
|
_Optional, Default=""_
|
|
|
|
The `namespaces` option defines the namespaces in which the consul catalog services will be discovered.
|
|
When using the `namespaces` option, the discovered configuration object names will be suffixed as shown below:
|
|
|
|
```text
|
|
<resource-name>@consulcatalog-<namespace>
|
|
```
|
|
|
|
!!! warning
|
|
|
|
The namespaces option only works with [Consul Enterprise](https://www.consul.io/docs/enterprise),
|
|
which provides the [Namespaces](https://www.consul.io/docs/enterprise/namespaces) feature.
|
|
|
|
!!! warning
|
|
|
|
One should only define either the `namespaces` option or the `namespace` option.
|
|
|
|
```yaml tab="File (YAML)"
|
|
providers:
|
|
consulCatalog:
|
|
namespaces:
|
|
- "ns1"
|
|
- "ns2"
|
|
# ...
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
[providers.consulCatalog]
|
|
namespaces = ["ns1", "ns2"]
|
|
# ...
|
|
```
|
|
|
|
```bash tab="CLI"
|
|
--providers.consulcatalog.namespaces=ns1,ns2
|
|
# ...
|
|
```
|
|
|
|
### `watch`
|
|
|
|
_Optional, Default=false_
|
|
|
|
When set to `true`, watches for Consul changes ([Consul watches checks](https://www.consul.io/docs/dynamic-app-config/watches#checks)).
|
|
|
|
```yaml tab="File (YAML)"
|
|
providers:
|
|
consulCatalog:
|
|
watch: true
|
|
# ...
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
[providers.consulCatalog]
|
|
watch = true
|
|
# ...
|
|
```
|
|
|
|
```bash tab="CLI"
|
|
--providers.consulcatalog.watch=true
|
|
# ...
|
|
```
|