traefik/providerTemplates/marathon.tmpl

{{$apps := .Applications}}
[backends]{{range .Tasks}}
    [backends.backend{{.AppID | replace "/" "-"}}.servers.server-{{.ID | replace "." "-"}}]
    url = "http://{{.Host}}:{{getPort .}}"
    {{$appID := .AppID}}
    {{range $apps}}
    {{if eq $appID .ID}}
    weight = {{getWeight .}}
    {{end}}
    {{end}}
{{end}}

[frontends]{{range .Applications}}
  [frontends.frontend{{.ID | replace "/" "-"}}]
  backend = "backend{{.ID | replace "/" "-"}}"
    [frontends.frontend-{{getHost . | replace "/" "-"}}.routes.route-host-{{getHost . | replace "/" "-"}}]
    rule = "Host"
    value = "{{getHost . | replace "/" "-"}}.{{$.Domain}}"
{{end}}