Я понял, первая часть, на которую следует обратить внимание, это то, что в traefik v2 есть два типа конфигурации, статическая и динамическая. Поэтому я создал два файла, traefik.toml и traefik-dynamic.toml.
содержимое файла traefik.toml:
[log]
level = "DEBUG"
filePath = "log-file.log"
[accessLog]
filePath = "log-access.log"
bufferingSize = 100
[providers]
[providers.file]
filename = "traefik-dynamic.toml"
[api]
dashboard = true
debug = true
[entryPoints]
[entryPoints.web]
address = ":80"
[entryPoints.web-secure]
address = ":443"
[entryPoints.dashboard]
address = ":8080"
[certificatesResolvers.sample.acme]
email = "myemail@example.com"
storage = "acme.json"
[certificatesResolvers.sample.acme.httpChallenge]
# used during the challenge
entryPoint = "web"
traefik-dynamic.toml:
[http]
# Redirect to https
[http.middlewares]
[http.middlewares.test-redirectscheme.redirectScheme]
scheme = "https"
[http.routers]
[http.routers.my-router]
rule = "Host(`www.example.com`)"
service = "phx"
entryPoints = ["web-secure"]
[http.routers.my-router.tls]
certResolver = "sample"
[http.services]
[http.services.phx.loadbalancer]
[[http.services.phx.loadbalancer.servers]]
url = "http://127.0.0.1:4000"