can not use traefik with dynamic configuration file - go

Question

I'm trying to learn and use traefik.
here is my docker-compose.yaml:
version: "3"
services:
traefik:
image: "traefik:v2.0"
container_name: "traefik"
ports:
- "80:80"
- "8080:8080"
volumes:
- "/var/run/docker.sock:/var/run/docker.sock"
- ./traefik:/etc/traefik
- ./docker:/etc/docker
whoami:
image: "containous/whoami"
container_name: "whoami"
and here is my traefik.toml:
[entryPoints]
[entryPoints.web]
address = ":80"
[providers]
[providers.file]
filename = "/etc/docker/dynamic_conf.toml"
[providers.docker]
exposedByDefault = false
[api]
insecure = true
and this is my dynamic_conf.toml:
[http]
[http.routers]
[http.routers.whoami]
rule = "Host(`whoami.localhost`)"
entrypoints = "web"
service = "whoami"
but when i build the image and run it, I get an error:
Cannot start the provider *file.Provider: toml: cannot load TOML value of type string into a Go slice
Screenshot: traefik errors
I couldn't find out the reason, I searched and I changed
filename = "/etc/docker/dynamic_conf.toml"
to
filename = ["/etc/docker/dynamic_conf.toml"]

Answer 1

entryPoints is a slice, not a string.
I'm not sure if you need to change the capitalization, but you definitely need to change it to a slice, like this:
entryPoints = ["web"]
You can find an example for it on this page under Priority > Set priorities -- using the File Provider.
Also, the filename property is a string, so leave it as it was before. See this link:
filename = "/etc/docker/dynamic_conf.toml"