Getting permission denied error with lets encrypt if acme.json permission is set to 600

Traefik Traefik v2 (latest)
1

Hi I'm facing couple of problems when using lets encrypt.
traefik version: v2.1

  1. If I set the file permission of acme.json file to 600 them I'm getting below error.
level=error msg="The ACME resolver \"le\" is skipped from the resolvers list because: unable to get ACME account: open /etc/traefik/acme/acme.json: permission denied"

  1. If I set the permisison other than 600 then I'm getting file permission is too open. please change the file permission to 600.

  2. I have create a certificatesResolvers with name myresolver and using it like below
    proxy-config.yaml

`[http.routers]
  [http.routers.myrouter]
    rule = "Host(`bchain.example.in`)"
    middlewares = ["redirect-to-https"]
    service = "goserver"
    entryPoints = ["websecure"]
    [http.routers.myrouter.tls]
      certResolver = "myresolver"
      [[http.routers.myrouter.tls.domains]]
        main = "bchain.example.com"

[http.middlewares]
  [http.middlewares.redirect-to-https.redirectScheme]
   scheme = "https"
   #port = "443"
   permanent = true

[http.services]
  [http.services.goserver.loadBalancer]
    [[http.services.goserver.loadBalancer.servers]]
      url = "http://10.160.0.10:8001" # using this to send the req to go app server for REST Api's

[certificatesResolvers.myresolver.acme]
  email = "test@gmail.com"
  storage = "./letsencrypt/acme.json"
  caServer = "https://acme-staging-v02.api.letsencrypt.org/directory"
  [certificatesResolvers.myresolver.acme.tlsChallenge]`

But in the logs I'm getting below error

level=error msg="the router myrouter@file uses a non-existent resolver: myresolver"

docker-traefik.yaml file

traefik:
    deploy:
      replicas: 1
      restart_policy:
        condition: on-failure
        delay: 5s
        max_attempts: 5
      placement:
        constraints:
          - node.hostname == gcloud1
          - node.role == manager
      labels:
        - "traefik.enable=true"
        #  here router is api and in proxy-config.toml file router is myrouter
        - "traefik.http.routers.api.rule=Host(`traefik.example.com`) && (PathPrefix(`/api`) || PathPrefix(`/dashboard`))"
        - "traefik.http.routers.api.service=api@internal"  # Let the dashboard access the traefik api
        - "traefik.http.routers.api.middlewares=auth"      # Creating a auth middleware
        - "traefik.http.middlewares.auth.basicauth.users=prayag:XXX" # using double $ to skip single $ else not accepted
        - "traefik.http.routers.api.tls.certresolver=le"
        - "traefik.http.routers.api.entrypoints=websecure"
        # middleware redirect
        - "traefik.http.middlewares.redirect-to-https.redirectscheme.scheme=https"
        # global redirect to https if any request is a http request
        - "traefik.http.routers.redirs.rule=hostregexp(`{host:.+}`)" # redirect anything
        - "traefik.http.routers.redirs.entrypoints=web" # telling to redirect just http request not everything
        - "traefik.http.routers.redirs.middlewares=redirect-to-https"

    hostname: traefik
    image: "traefik:v2.1"

    command:
      - --providers.file.filename=/etc/traefik/proxy-config.toml # Using file for reading the config
      - --entrypoints.websecure.address=:443
        #- --api.insecure # enabling dashboard on insecure connection
      - --api=true
      - --api.dashboard=true
      - --api.debug=true
      - --log.level=DEBUG
      # lets encrypt
      - --certificatesresolvers.le.acme.email=mygmail@gmail.com
      - --certificatesresolvers.le.acme.storage=/etc/traefik/acme/acme.json
      - --certificatesresolvers.le.acme.tlschallenge=true
      - --certificatesResolvers.le.acme.caServer=https://acme-staging-v02.api.letsencrypt.org/directory

    volumes:
      - ./proxy-config.toml:/etc/traefik/proxy-config.toml:ro
      - ./letsencrypt/acme.json:/etc/traefik/acme/acme.json

    ports:
      - target: 5050
        published: 5050
        mode: host
      - target: 443
        published: 443
        mode: host
      - target: 8080
        published: 8080
        mode: ingress # traefik dashboard

    networks:
      - proxy-network
      - test-network

My Scenario is I'm trying to use two different subdomain. One is for dashboard(traefik.example.com) and other is for my REST Api's(bchain.example.com) and for the same I'm trying to get the tls cert.