Traefik 2.0: How to configure `traefik.frontend.rule=Host:example.com`? - traefik

Question

I just attempted to upgrade my existing pretty simple Traefik setup to 2.0.
I am using Docker as a provider.
I am running the containers with docker-compose. This is my docker-compose config:
version: "3.5"
services:
traefik:
image: traefik:v2.0-alpine
read_only: yes
ports:
- 80:80
- 443:443
volumes:
- type: bind
source: /var/run/docker.sock
target: /var/run/docker.sock
- type: bind
source: ./traefik.toml
target: /traefik.toml
- type: bind
source: ./acme.json
target: /acme.json
networks:
- traefik
example:
image: example.com/example/example
labels:
- "traefik.enable=true"
- "traefik.frontend.rule=Host:example.com"
- "traefik.docker.network=traefik"
networks:
- traefik
This is my traefik.toml:
defaultEntryPoints = ["http", "https"]
[Global]
sendAnonymousUsage = true
[entryPoints]
[entryPoints.http]
address = ":80"
[entryPoints.http.redirect]
entryPoint = "https"
[entryPoints.https]
address = ":443"
[entryPoints.https.tls]
[acme]
email = "ssl#example.com"
storage = "acme.json"
entryPoint = "https"
onHostRule = true
onDemand = false
acmeLogging = true
[acme.tlsChallenge]
[docker]
exposedByDefault = false
This setup works fine with Traefik 1.7.
With Traefik 2.0 I observe two issues, looking at the ACME log:
Unable to obtain ACME certificate for domains traefik-example-deployment
Unable to obtain ACME certificate for domains example-example-deployment
Traefik is apparently exposing both containers. It should only expose the example container.
Traefik is ignoring the traefik.frontend.rule=Host:example.com label.
I suspect this might be due to configuration format changes in Traefik 2.0. However, although I looked through the 2.0 documentation, I was unable how the correct configuration looks.

Answer 1

Routers¶
To update the configuration of the Router automatically attached to the container, add labels starting with traefik.routers.{name-of-your-choice}. and followed by the option you want to change. For example, to change the rule, you could add the label traefik.http.routers.my-container.rule=Host(my-domain).
Every Router parameter can be updated this way.
As Mentioned in Doc - https://docs.traefik.io/v2.0/providers/docker/
change the labels: to
services:
my-container:
# ...
labels:
- traefik.http.routers.my-container.rule=Host(`my-domain`)
To tell Traefik not to expose Container - add - traefik.enable=false
As traefik Expose containers by default through Traefik. If set to false, containers that don't have a traefik.enable=true label will be ignored from the resulting routing configuration.
exposedByDefault (Optional, Default=true)¶