[SOLVED] Basic setup (Traefik + oAuth + Companion) : Dashboard can't be reached due to "404 Error"

[NeoMod]

Hi everyone,

I've got my fair experience with Docker and Traefik and I thought the setup described here was worth tinkering with.

I've been trying to establish a very simple baseline with a stack operating just Traefik 2.7 with Cloudflare (free) services and a paid domain and it seems there is a "stupid" error I'm missing somewhere.

Traefik is running fine, no errors in logs, and so are oAuth and Companion containers: yet the Traefik Dashboard only returns a "404 error".

Here is the composer file I'm testing with, maybe someone will spot the error:

version: "3.9"

networks:
  t2_proxy:
    name: t2_proxy
    driver: bridge
    ipam:
      config:
        - subnet: 192.168.90.0/24
  default:
    driver: bridge
  socket_proxy:
    name: socket_proxy
    driver: bridge
    ipam:
      config:
        - subnet: 192.168.91.0/24
secrets:
  htpasswd:
    file: $DOCKERDIR/secrets/htpasswd
  cf_email:
    file: $DOCKERDIR/secrets/cf_email
  cf_api_key:
    file: $DOCKERDIR/secrets/cf_api_key
  cf_token:
    file: $DOCKERDIR/secrets/cf_token
  traefik_forward_auth:
    file: $DOCKERDIR/secrets/traefik_forward_auth
    
 # Common environment values
x-environment: &default-tz-puid-pgid
  TZ: $TZ
  PUID: $PUID
  PGID: $PGID

# Keys common to some of the services in basic-services.txt
x-common-keys-core: &common-keys-core
  networks:
    - t2_proxy
  security_opt:
    - no-new-privileges:true
  restart: always
  # profiles:
  # - core

# Keys common to some of the services in basic-services.txt
x-common-keys-monitoring: &common-keys-monitoring
  networks:
    - t2_proxy
  security_opt:
    - no-new-privileges:true
  restart: always
  # profiles:
  # - monitoring

# Keys common to some of the dependent services/apps
x-common-keys-apps: &common-keys-apps
  networks:
    - t2_proxy
  security_opt:
    - no-new-privileges:true
  restart: unless-stopped
  # profiles:
  # - apps

# Keys common to some of the services in media-services.txt
x-common-keys-media: &common-keys-media
  networks:
    - t2_proxy
  security_opt:
    - no-new-privileges:true
  restart: "no"
  # profiles:
  # - media
  
  ########################### SERVICES
services:
  ############################# FRONTENDS

  # Traefik 2 - Reverse Proxy
  # Touch (create empty files) traefik.log and acme/acme.json. Set acme.json permissions to 600.
  # touch $DOCKERDIR/traefik2/acme/acme.json
  # chmod 600 $DOCKERDIR/traefik2/acme/acme.json
  # touch $DOCKERDIR/logs/cloudserver/traefik.log # customize this
  traefik:
    <<: *common-keys-core # See EXTENSION FIELDS at the top
    container_name: traefik
    image: traefik:2.7
    command: # CLI arguments
      - --global.checkNewVersion=true
      - --global.sendAnonymousUsage=true
      - --entryPoints.http.address=:80
      - --entryPoints.https.address=:443
      # Allow these IPs to set the X-Forwarded-* headers - Cloudflare IPs: https://www.cloudflare.com/ips/
      - --entrypoints.https.forwardedHeaders.trustedIPs=$CLOUDFLARE_IPS,$LOCAL_IPS
      - --entryPoints.traefik.address=:8080
      # - --entryPoints.ping.address=:8081
      - --api=true
      # - --api.insecure=true
      - --api.dashboard=true
      #- --ping=true
      # - --serversTransport.insecureSkipVerify=true
      - --log=true
      - --log.filePath=/logs/traefik.log
      - --log.level=DEBUG # (Default: error) DEBUG, INFO, WARN, ERROR, FATAL, PANIC
      - --accessLog=true
      - --accessLog.filePath=/logs/access.log
      - --accessLog.bufferingSize=100 # Configuring a buffer of 100 lines
      - --accessLog.filters.statusCodes=204-299,400-499,500-599
      - --providers.docker=true
       - --providers.docker.endpoint=unix:///var/run/docker.sock # Use Docker Socket Proxy instead for improved security
      #- --providers.docker.endpoint=tcp://socket-proxy:2375
      # Automatically set Host rule for services
      # - --providers.docker.defaultrule=Host(`{{ index .Labels "com.docker.compose.service" }}.$DOMAINNAME_CLOUD_SERVER`)
      - --providers.docker.exposedByDefault=false
      - --entrypoints.https.http.middlewares=chain-oauth@file
      - --entrypoints.https.http.tls.options=tls-opts@file
      # Add dns-cloudflare as default certresolver for all services. Also enables TLS and no need to specify on individual services
      - --entrypoints.https.http.tls.certresolver=dns-cloudflare
      - --entrypoints.https.http.tls.domains[0].main=$DOMAINNAME_CLOUD_SERVER
      - --entrypoints.https.http.tls.domains[0].sans=*.$DOMAINNAME_CLOUD_SERVER
      # - --entrypoints.https.http.tls.domains[1].main=$DOMAINNAME2 # Pulls main cert for second domain
      # - --entrypoints.https.http.tls.domains[1].sans=*.$DOMAINNAME2 # Pulls wildcard cert for second domain
      - --providers.docker.network=t2_proxy
      - --providers.docker.swarmMode=false
      - --providers.file.directory=/rules # Load dynamic configuration from one or more .toml or .yml files in a directory
      # - --providers.file.filename=/path/to/file # Load dynamic configuration from a file
      - --providers.file.watch=true # Only works on top level files in the rules folder
      # - --certificatesResolvers.dns-cloudflare.acme.caServer=https://acme-staging-v02.api.letsencrypt.org/directory # LetsEncrypt Staging Server - uncomment when testing
      - --certificatesResolvers.dns-cloudflare.acme.email=$CLOUDFLARE_EMAIL
      - --certificatesResolvers.dns-cloudflare.acme.storage=/acme.json
      - --certificatesResolvers.dns-cloudflare.acme.dnsChallenge.provider=cloudflare
      - --certificatesResolvers.dns-cloudflare.acme.dnsChallenge.resolvers=1.1.1.1:53,1.0.0.1:53
      - --certificatesResolvers.dns-cloudflare.acme.dnsChallenge.delayBeforeCheck=90 # To delay DNS check and reduce LE hitrate
      # - --metrics.prometheus=true
      # - --metrics.prometheus.buckets=0.1,0.3,1.2,5.0
    networks:
      t2_proxy:
        ipv4_address: 192.168.90.254 # You can specify a static IP
      socket_proxy:
    #healthcheck:
    #  test: ["CMD", "traefik", "healthcheck", "--ping"]
    #  interval: 5s
    #  retries: 3
    ports:
      - target: 80
        published: 80
        protocol: tcp
        mode: host
      - target: 443
        published: 443
        protocol: tcp
        mode: host
      # - target: 8080 # insecure api wont work
      #   published: 8080
      #   protocol: tcp
      #   mode: host
    volumes:
      - $DOCKERDIR/appdata/traefik2/rules/cloudserver:/rules # file provider directory
      - /var/run/docker.sock:/var/run/docker.sock:ro # Use Docker Socket Proxy instead for improved security
      - $DOCKERDIR/appdata/traefik2/acme/acme.json:/acme.json # cert location - you must create this emtpy file and change permissions to 600
      - $DOCKERDIR/logs/cloudserver/traefik:/logs # for fail2ban or crowdsec
    environment:
      - TZ=$TZ
      - CF_API_EMAIL_FILE=/run/secrets/cf_email
      - CF_API_KEY_FILE=/run/secrets/cf_api_key
      - HTPASSWD_FILE=/run/secrets/htpasswd # HTPASSWD_FILE can be whatever as it is not used/called anywhere.
      - DOMAINNAME_CLOUD_SERVER=neodata.cc # Passing the domain name to traefik container to be able to use the variable in rules. 
    secrets:
      - cf_email
      - cf_api_key
      - htpasswd
    labels:
      #- "autoheal=true"
      - "traefik.enable=true"
      # HTTP-to-HTTPS Redirect
      - "traefik.http.routers.http-catchall.entrypoints=http"
      - "traefik.http.routers.http-catchall.rule=HostRegexp(`{host:.+}`)"
      - "traefik.http.routers.http-catchall.middlewares=redirect-to-https"
      - "traefik.http.middlewares.redirect-to-https.redirectscheme.scheme=https"
      # HTTP Routers
      - "traefik.http.routers.traefik-rtr.entrypoints=https"
      - "traefik.http.routers.traefik-rtr.rule=Host(`traefik.$DOMAINNAME_CLOUD_SERVER`)"
      - "traefik.http.routers.traefik-rtr.tls=true" # Some people had 404s without this
      - "traefik.http.routers.traefik-rtr.tls.certresolver=dns-cloudflare" # Comment out this line after first run of traefik to force the use of wildcard certs
      - "traefik.http.routers.traefik-rtr.tls.domains[0].main=$DOMAINNAME_CLOUD_SERVER"
      - "traefik.http.routers.traefik-rtr.tls.domains[0].sans=*.$DOMAINNAME_CLOUD_SERVER"
      # - "traefik.http.routers.traefik-rtr.tls.domains[1].main=$DOMAINNAME2" # Pulls main cert for second domain
      # - "traefik.http.routers.traefik-rtr.tls.domains[1].sans=*.$DOMAINNAME2" # Pulls wildcard cert for second domain
      ## Services - API
      - "traefik.http.routers.traefik-rtr.service=api@internal"
      ## Healthcheck/ping
      #- "traefik.http.routers.ping.rule=Host(`traefik.$DOMAINNAME_CLOUD_SERVER`) && Path(`/ping`)"
      #- "traefik.http.routers.ping.tls=true"
      #- "traefik.http.routers.ping.service=ping@internal"
      ## Middlewares
      #- "traefik.http.routers.traefik-rtr.middlewares=chain-no-auth@file" # For No Authentication
      #- "traefik.http.routers.traefik-rtr.middlewares=chain-auth-basic@file" # For Basic HTTP Authentication
      - "traefik.http.routers.traefik-rtr.middlewares=chain-oauth@file" # For Google OAuth
      #- "traefik.http.routers.traefik-rtr.middlewares=chain-authelia@file" # For Authelia Authentication

  # Docker Socket Proxy - Security Enchanced Proxy for Docker Socket
  socket-proxy:
    <<: *common-keys-core # See EXTENSION FIELDS at the top
    container_name: socket-proxy
    image: tecnativa/docker-socket-proxy
    networks:
      socket_proxy:
        ipv4_address: 192.168.91.254 # You can specify a static IP
    privileged: true # true for VM. False for unprivileged LXC container.
    ports:
    # - "127.0.0.1:2375:2375" # Port 2375 should only ever get exposed to the internal network. When possible use this line.
    # I use the next line instead, as I want portainer to manage multiple docker endpoints within my home network.
     - "2375:2375"
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"
    environment:
      - LOG_LEVEL=debug # debug,info,notice,warning,err,crit,alert,emerg
      ## Variables match the URL prefix (i.e. AUTH blocks access to /auth/* parts of the API, etc.).
      # 0 to revoke access.
      # 1 to grant access.
      ## Granted by Default
      - EVENTS=1
      - PING=1
      - VERSION=1
      ## Revoked by Default
      # Security critical
      - AUTH=0
      - SECRETS=0
      - POST=1 # Watchtower
      # Not always needed
      - BUILD=0
      - COMMIT=0
      - CONFIGS=0
      - CONTAINERS=1 # Traefik, portainer, etc.
      - DISTRIBUTION=0
      - EXEC=0
      - IMAGES=1 # Portainer
      - INFO=1 # Portainer
      - NETWORKS=1 # Portainer
      - NODES=0
      - PLUGINS=0
      - SERVICES=1 # Portainer
      - SESSION=0
      - SWARM=0
      - SYSTEM=0
      - TASKS=1 # Portainer
      - VOLUMES=1 # Portainer

  # Google OAuth - Single Sign On using OAuth 2.0
  # https://www.smarthomebeginner.com/google-oauth-with-traefik-docker/
  oauth:
    <<: *common-keys-core # See EXTENSION FIELDS at the top
    container_name: oauth
    image: thomseddon/traefik-forward-auth:latest
    # image: thomseddon/traefik-forward-auth:2.1-arm # Use this image with Raspberry Pi
    # Allow apps to bypass OAuth. Radarr example below will bypass OAuth if API key is present in the request (eg. from NZB360 mobile app).
    # While this is one way, the recommended way is to bypass authentication using Traefik labels shown in some of the -Arr apps in this file.
    # command: --rule.radarr.action=allow --rule.radarr.rule="Headers(`X-Api-Key`, `$RADARR_API_KEY`)"
    # command: --rule.sabnzbd.action=allow --rule.sabnzbd.rule="HeadersRegexp(`X-Forwarded-Uri`, `$SABNZBD_API_KEY`)"
    environment:
      - CONFIG=/config
      - COOKIE_DOMAIN=$DOMAINNAME_CLOUD_SERVER
      - INSECURE_COOKIE=false
      - AUTH_HOST=oauth.$DOMAINNAME_CLOUD_SERVER
      - URL_PATH=/_oauth
      - LOG_LEVEL=warn # set to trace while testing bypass rules
      - LOG_FORMAT=text
      - LIFETIME=86400 # 1 day
      - DEFAULT_ACTION=auth
      - DEFAULT_PROVIDER=google
    secrets:
      - source: traefik_forward_auth
        target: /config
    labels:
      - "traefik.enable=true"
      ## HTTP Routers
      - "traefik.http.routers.oauth-rtr.tls=true"
      - "traefik.http.routers.oauth-rtr.entrypoints=https"
      - "traefik.http.routers.oauth-rtr.rule=Host(`oauth.$DOMAINNAME_CLOUD_SERVER`)"
      ## Middlewares
      - "traefik.http.routers.oauth-rtr.middlewares=chain-oauth@file"
      ## HTTP Services
      - "traefik.http.routers.oauth-rtr.service=oauth-svc"
      - "traefik.http.services.oauth-svc.loadbalancer.server.port=4181"
      
# Cloudflare-Companion - Automatic CNAME DNS Creation
  cf-companion:
    <<: *common-keys-core # See EXTENSION FIELDS at the top
    container_name: cf-companion
    image: tiredofit/traefik-cloudflare-companion:latest
    networks:
      - socket_proxy
    environment:
      - TIMEZONE=$TZ
      - TRAEFIK_VERSION=2
      - CF_TOKEN__FILE=/run/secrets/cf_token
      - TARGET_DOMAIN=cdoc.$DOMAINNAME_CLOUD_SERVER # Edit this. Either a subdomain or just $DOMAINNAME_CLOUD_SERVER pointing to the IP will work. See: https://github.com/htpcBeginner/docker-traefik/issues/244.
      - DOMAIN1=$DOMAINNAME_CLOUD_SERVER
      - DOMAIN1_ZONE_ID=$CLOUDFLARE_ZONEID # Copy from Cloudflare Overview page
      - DOMAIN1_PROXIED=TRUE
      - DOCKER_HOST=tcp://socket-proxy:2375
    secrets: 
      - cf_token
    labels:
      # Add hosts specified in rules here to force cf-companion to create the CNAMEs
      # Since cf-companion creates CNAMEs based on host rules, this a workaround for non-docker/external apps
      - "traefik.http.routers.cf-companion-rtr.rule=Host(Host(`webmin.$DOMAINNAME_CLOUD_SERVER`) || Host(`shell.$DOMAINNAME_CLOUD_SERVER`) || Host(`stcdoc.$DOMAINNAME_CLOUD_SERVER`) || Host(`ag.$DOMAINNAME_CLOUD_SERVER`)"

[NeoMod]

Issue resolved.
I didn't notice the correlation with crowdsec and the relative bouncer, so I omitted the service.
Still, I would suggest putting a note in the files - since I haven't seen any mention about it in the blog post - about the necessity to create manually a crowdsec api for a "traefik bouncer".