Update README.md

- Added an small FAQ
- Added usage examples
- Added new label 'traefik.frontend.rule', more useful to add your own domains

templates/traefik/20/README.md

@@ -70,6 +70,7 @@ Use this labels if you choose extenal rancher integration.
 - traefik.backend.loadbalancer.method = < drr | wrr > # Override default lb algorithm `drr`
 - traefik.backend.circuitbreaker.expression = < expression > # Override default backend circuitbreaker expression `NetworkErrorRatio() > 0.5`
 - traefik.frontend.passHostHeader = < true | false > # Forward client Host header to the backend. Default `true`
+- traefik.frontend.rule = < rule > # Rule for host. Usually used to specify a host. I.e: 'Host:MySite.com'
 - traefik.weight = < weight >               # Override default backend weight `5`
 - traefik.alias = < alias >                 # Alternate names to route rule. Multiple values separated by ",". traefik.domain is appended. WARNING: You could have collisions BE CAREFULL
 - traefik.alias.fqdn = < alias fqdn >                   # Alternate names to route rule. Multiple values separated by ",". traefik.domain must be defined but is not appended here.
@@ -102,4 +103,24 @@ More info [rancher-traefik](https://github.com/rawmind0/rancher-traefik)
 
 Note: To access the services, you need to create A or CNAMES dns entries for every one.
 
+### Usage examples
+
+#### Setup Traefik for a custom domain
+
+You must set these labels for the service your want to expose:
+- traefik.port = 8080
+- traefik.acme = true
+- traefik.frontend.rule = Host:MyCustoDomain.com
+- traefik.enable = true
+
+### F.A.Q
+
+#### Q: Traefik doesn't expose my service
+
+Depending of de Traefik configuration we can diffenciate two cases:
+- If you configured Traefik with label *rancher_healthcheck=true* -> ensure your service has a healthcheck
+- If you configured Traefik without healthcheck, then check the Traefik log. Some times Traefik fails when try to load an invalid config and, before that, doesn't load new services -> restart Traefik should fix that
+
+### References
+
 [traefik rancher backend]: https://docs.traefik.io/configuration/backends/rancher/#labels-overriding-default-behaviour