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416 lines
12 KiB
Markdown
416 lines
12 KiB
Markdown
---
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title: "Routing & Load Balancing Overview |Traefik Docs"
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description: "Read the official Traefik documentation to learn more on the Traefik Proxy architecture and the components that enable the routes to be created."
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---
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# Overview
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What's Happening to the Requests?
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{: .subtitle }
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Let's zoom in on Traefik's architecture and talk about the components that enable the routes to be created.
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First, when you start Traefik, you define [entrypoints](../entrypoints/) (in their most basic forms, they are port numbers).
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Then, connected to these entrypoints, [routers](../routers/) analyze the incoming requests to see if they match a set of [rules](../routers/#rule).
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If they do, the router might transform the request using pieces of [middleware](../middlewares/overview.md) before forwarding them to your [services](./services/index.md).
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## Clear Responsibilities
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- [_Providers_](../providers/overview.md) discover the services that live on your infrastructure (their IP, health, ...)
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- [_Entrypoints_](./entrypoints.md) listen for incoming traffic (ports, ...)
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- [_Routers_](./routers/index.md) analyse the requests (host, path, headers, SSL, ...)
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- [_Services_](./services/index.md) forward the request to your services (load balancing, ...)
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- [_Middlewares_](../middlewares/overview.md) may update the request or make decisions based on the request (authentication, rate limiting, headers, ...)
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## Example with a File Provider
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Below is an example of a full configuration file for the [file provider](../providers/file.md) that forwards `http://example.com/whoami/` requests to a service reachable on `http://private/whoami-service/`.
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In the process, Traefik will make sure that the user is authenticated (using the [BasicAuth middleware](../middlewares/http/basicauth.md)).
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Static configuration:
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```yaml tab="File (YAML)"
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entryPoints:
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web:
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# Listen on port 8081 for incoming requests
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address: :8081
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providers:
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# Enable the file provider to define routers / middlewares / services in file
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file:
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directory: /path/to/dynamic/conf
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```
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```toml tab="File (TOML)"
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[entryPoints]
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[entryPoints.web]
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# Listen on port 8081 for incoming requests
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address = ":8081"
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[providers]
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# Enable the file provider to define routers / middlewares / services in file
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[providers.file]
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directory = "/path/to/dynamic/conf"
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```
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```bash tab="CLI"
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# Listen on port 8081 for incoming requests
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--entryPoints.web.address=:8081
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# Enable the file provider to define routers / middlewares / services in file
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--providers.file.directory=/path/to/dynamic/conf
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```
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Dynamic configuration:
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```yaml tab="YAML"
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# http routing section
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http:
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routers:
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# Define a connection between requests and services
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to-whoami:
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rule: "Host(`example.com`) && PathPrefix(`/whoami/`)"
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# If the rule matches, applies the middleware
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middlewares:
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- test-user
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# If the rule matches, forward to the whoami service (declared below)
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service: whoami
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middlewares:
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# Define an authentication mechanism
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test-user:
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basicAuth:
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users:
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- test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/
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services:
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# Define how to reach an existing service on our infrastructure
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whoami:
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loadBalancer:
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servers:
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- url: http://private/whoami-service
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```
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```toml tab="TOML"
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# http routing section
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[http]
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[http.routers]
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# Define a connection between requests and services
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[http.routers.to-whoami]
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rule = "Host(`example.com`) && PathPrefix(`/whoami/`)"
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# If the rule matches, applies the middleware
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middlewares = ["test-user"]
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# If the rule matches, forward to the whoami service (declared below)
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service = "whoami"
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[http.middlewares]
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# Define an authentication mechanism
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[http.middlewares.test-user.basicAuth]
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users = ["test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/"]
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[http.services]
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# Define how to reach an existing service on our infrastructure
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[http.services.whoami.loadBalancer]
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[[http.services.whoami.loadBalancer.servers]]
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url = "http://private/whoami-service"
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```
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!!! info ""
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In this example, we use the [file provider](../providers/file.md).
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Even if it is one of the least magical way of configuring Traefik, it explicitly describes every available notion.
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!!! info "HTTP / TCP"
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In this example, we've defined routing rules for http requests only.
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Traefik also supports TCP requests. To add [TCP routers](./routers/index.md) and [TCP services](./services/index.md), declare them in a TCP section like in the following.
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??? example "Adding a TCP route for TLS requests on whoami-tcp.example.com"
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**Static Configuration**
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```yaml tab="File (YAML)"
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entryPoints:
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web:
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# Listen on port 8081 for incoming requests
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address: :8081
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providers:
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# Enable the file provider to define routers / middlewares / services in file
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file:
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directory: /path/to/dynamic/conf
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```
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```toml tab="File (TOML)"
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[entryPoints]
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[entryPoints.web]
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# Listen on port 8081 for incoming requests
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address = ":8081"
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[providers]
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# Enable the file provider to define routers / middlewares / services in file
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[providers.file]
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directory = "/path/to/dynamic/conf"
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```
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```bash tab="CLI"
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# Listen on port 8081 for incoming requests
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--entryPoints.web.address=:8081
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# Enable the file provider to define routers / middlewares / services in file
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--providers.file.directory=/path/to/dynamic/conf
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```
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**Dynamic Configuration**
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```yaml tab="YAML"
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# http routing section
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http:
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routers:
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# Define a connection between requests and services
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to-whoami:
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rule: Host(`example.com`) && PathPrefix(`/whoami/`)
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# If the rule matches, applies the middleware
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middlewares:
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- test-user
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# If the rule matches, forward to the whoami service (declared below)
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service: whoami
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middlewares:
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# Define an authentication mechanism
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test-user:
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basicAuth:
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users:
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- test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/
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services:
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# Define how to reach an existing service on our infrastructure
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whoami:
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loadBalancer:
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servers:
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- url: http://private/whoami-service
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tcp:
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routers:
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to-whoami-tcp:
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service: whoami-tcp
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rule: HostSNI(`whoami-tcp.example.com`)
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tls: {}
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services:
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whoami-tcp:
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loadBalancer:
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servers:
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- address: xx.xx.xx.xx:xx
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```
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```toml tab="TOML"
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# http routing section
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[http]
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[http.routers]
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# Define a connection between requests and services
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[http.routers.to-whoami]
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rule = "Host(`example.com`) && PathPrefix(`/whoami/`)"
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# If the rule matches, applies the middleware
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middlewares = ["test-user"]
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# If the rule matches, forward to the whoami service (declared below)
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service = "whoami"
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[http.middlewares]
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# Define an authentication mechanism
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[http.middlewares.test-user.basicAuth]
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users = ["test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/"]
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[http.services]
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# Define how to reach an existing service on our infrastructure
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[http.services.whoami.loadBalancer]
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[[http.services.whoami.loadBalancer.servers]]
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url = "http://private/whoami-service"
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[tcp]
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[tcp.routers]
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[tcp.routers.to-whoami-tcp]
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rule = "HostSNI(`whoami-tcp.example.com`)"
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service = "whoami-tcp"
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[tcp.routers.to-whoami-tcp.tls]
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[tcp.services]
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[tcp.services.whoami-tcp.loadBalancer]
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[[tcp.services.whoami-tcp.loadBalancer.servers]]
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address = "xx.xx.xx.xx:xx"
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```
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## Transport configuration
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Most of what happens to the connection between the clients and Traefik,
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and then between Traefik and the backend servers, is configured through the
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[entrypoints](../entrypoints) and the [routers](../routers).
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In addition, a few parameters are dedicated to configuring globally
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what happens with the connections between Traefik and the backends.
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This is done through the `serversTransport` section of the configuration,
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which features these options:
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### `insecureSkipVerify`
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_Optional, Default=false_
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`insecureSkipVerify` disables SSL certificate verification.
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```yaml tab="File (YAML)"
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## Static configuration
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serversTransport:
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insecureSkipVerify: true
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```
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```toml tab="File (TOML)"
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## Static configuration
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[serversTransport]
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insecureSkipVerify = true
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```
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```bash tab="CLI"
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## Static configuration
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--serversTransport.insecureSkipVerify=true
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```
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### `rootCAs`
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_Optional_
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`rootCAs` is the list of certificates (as file paths, or data bytes)
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that will be set as Root Certificate Authorities when using a self-signed TLS certificate.
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```yaml tab="File (YAML)"
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## Static configuration
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serversTransport:
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rootCAs:
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- foo.crt
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- bar.crt
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```
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```toml tab="File (TOML)"
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## Static configuration
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[serversTransport]
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rootCAs = ["foo.crt", "bar.crt"]
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```
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```bash tab="CLI"
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## Static configuration
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--serversTransport.rootCAs=foo.crt,bar.crt
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```
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### `maxIdleConnsPerHost`
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_Optional, Default=2_
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If non-zero, `maxIdleConnsPerHost` controls the maximum idle (keep-alive) connections to keep per-host.
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```yaml tab="File (YAML)"
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## Static configuration
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serversTransport:
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maxIdleConnsPerHost: 7
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```
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```toml tab="File (TOML)"
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## Static configuration
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[serversTransport]
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maxIdleConnsPerHost = 7
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```
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```bash tab="CLI"
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## Static configuration
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--serversTransport.maxIdleConnsPerHost=7
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```
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!!! info "Disable connection reuse"
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The default value of `maxIdleConnsPerHost` is 2, and the zero value is the fallback to the default (2).
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If you want to disable connection reuse, set `maxIdleConnsPerHost` to -1.
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### `forwardingTimeouts`
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`forwardingTimeouts` is about a number of timeouts relevant to when forwarding requests to the backend servers.
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#### `forwardingTimeouts.dialTimeout`
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_Optional, Default=30s_
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`dialTimeout` is the maximum duration allowed for a connection to a backend server to be established.
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Zero means no timeout.
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```yaml tab="File (YAML)"
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## Static configuration
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serversTransport:
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forwardingTimeouts:
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dialTimeout: 1s
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```
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```toml tab="File (TOML)"
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## Static configuration
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[serversTransport.forwardingTimeouts]
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dialTimeout = "1s"
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```
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```bash tab="CLI"
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## Static configuration
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--serversTransport.forwardingTimeouts.dialTimeout=1s
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```
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#### `forwardingTimeouts.responseHeaderTimeout`
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_Optional, Default=0s_
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`responseHeaderTimeout`, if non-zero, specifies the amount of time to wait for a server's response headers
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after fully writing the request (including its body, if any).
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This time does not include the time to read the response body.
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Zero means no timeout.
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```yaml tab="File (YAML)"
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## Static configuration
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serversTransport:
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forwardingTimeouts:
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responseHeaderTimeout: 1s
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```
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```toml tab="File (TOML)"
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## Static configuration
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[serversTransport.forwardingTimeouts]
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responseHeaderTimeout = "1s"
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```
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```bash tab="CLI"
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## Static configuration
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--serversTransport.forwardingTimeouts.responseHeaderTimeout=1s
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```
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#### `forwardingTimeouts.idleConnTimeout`
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_Optional, Default=90s_
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`idleConnTimeout`, is the maximum amount of time an idle (keep-alive) connection
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will remain idle before closing itself.
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Zero means no limit.
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```yaml tab="File (YAML)"
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## Static configuration
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serversTransport:
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forwardingTimeouts:
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idleConnTimeout: 1s
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```
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```toml tab="File (TOML)"
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## Static configuration
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[serversTransport.forwardingTimeouts]
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idleConnTimeout = "1s"
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```
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```bash tab="CLI"
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## Static configuration
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--serversTransport.forwardingTimeouts.idleConnTimeout=1s
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```
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{!traefik-for-business-applications.md!}
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