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Extend marathon port discovery to allow port names as identifier

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Fabian Gruber 2020-12-16 12:32:03 +01:00 • committed by GitHub
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docs/content/user-guides/marathon.md
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@ -14,13 +14,21 @@ Traefik tries to detect the configured mode and route traffic to the right IP ad
## Port detection
Traefik also attempts to determine the right port (which is a [non-trivial matter in Marathon](https://mesosphere.github.io/marathon/docs/ports.html)).
Following is the order by which Traefik tries to identify the port (the first one that yields a positive result will be used):
Traefik also attempts to determine the right port (which is a [non-trivial matter in Marathon](https://mesosphere.github.io/marathon/docs/ports.html)) from the following sources:
1. A arbitrary port specified through the `traefik.http.services.serviceName.loadbalancer.server.port=8080`
1. The task port (possibly indexed through the `traefik.http.services.serviceName.loadbalancer.server.port=index:0` label, otherwise the first one).
1. The port from the application's `portDefinitions` field (possibly indexed through the `traefik.http.services.serviceName.loadbalancer.server.port=index:0` label, otherwise the first one).
1. The port from the application's `ipAddressPerTask` field (possibly indexed through the `traefik.http.services.serviceName.loadbalancer.server.port=index:0` label, otherwise the first one).
1. An arbitrary port specified through label `traefik.http.services.serviceName.loadbalancer.server.port=8080`
1. The task port.
1. The port from the application's `portDefinitions` field.
1. The port from the application's `ipAddressPerTask` field.
### Port label syntax
To select a port, you can either
- specify the port directly: `traefik.http.services.serviceName.loadbalancer.server.port=8080`
- specify a port index: `traefik.http.services.serviceName.loadbalancer.server.port=index:0`
- specify a port name: `traefik.http.services.serviceName.loadbalancer.server.port=name:http`
- otherwise the first one is selected.
## Achieving high availability