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Document Docker port selection on multiple exposed ports

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Mathias Brodala 2024-07-29 10:22:04 +02:00 committed by GitHub
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10
docs/content/providers/docker.md
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@ -117,12 +117,14 @@ When using Docker Compose, labels are specified by the directive
Traefik retrieves the private IP and port of containers from the Docker API.
Port detection works as follows:
Port detection for private communication works as follows:
- If a container [exposes](https://docs.docker.com/engine/reference/builder/#expose) a single port,
then Traefik uses this port for private communication.
then Traefik uses this port.
- If a container [exposes](https://docs.docker.com/engine/reference/builder/#expose) multiple ports,
or does not expose any port, then you must manually specify which port Traefik should use for communication
then Traefik uses the lowest port. E.g. if `80` and `8080` are exposed, Traefik will use `80`.
- If a container does not expose any port, or the selection from multiple ports does not fit,
then you must manually specify which port Traefik should use for communication
by using the label `traefik.http.services.<service_name>.loadbalancer.server.port`
(Read more on this label in the dedicated section in [routing](../routing/providers/docker.md#port)).
@ -738,7 +740,7 @@ providers:
_Optional, Default=false_
If the parameter is set to `true`,
any [servers load balancer](../routing/services/index.md#servers-load-balancer) defined for Docker containers is created
any [servers load balancer](../routing/services/index.md#servers-load-balancer) defined for Docker containers is created
regardless of the [healthiness](https://docs.docker.com/engine/reference/builder/#healthcheck) of the corresponding containers.
It also then stays alive and responsive even at times when it becomes empty,
i.e. when all its children containers become unhealthy.

5
docs/content/routing/providers/docker.md
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@ -66,10 +66,11 @@ With Docker, Traefik can leverage labels attached to a container to generate rou
```
!!! important "Traefik Connecting to the Wrong Port: `HTTP/502 Gateway Error`"
By default, Traefik uses the first exposed port of a container.
By default, Traefik uses the lowest exposed port of a container as detailed in
[Port Detection](../providers/docker.md#port-detection) of the Docker provider.
Setting the label `traefik.http.services.xxx.loadbalancer.server.port`
overrides that behavior.
overrides this behavior.
??? example "Specifying more than one router and service per container"