Traefik: all subdirectories return 404 - linux

Question

First, thank you in advance for taking a look. I think I have a very basic mistake somewhere, but I have searched for hours with no result. I am trying to run a proof of concept to expose a container behind a traefik 2.4 reverse proxy at a subdirectory. My DDNS does not allow for subdomains, so I am stuck with subdirectories until I can prove this works.
My problem is every container I stand up is dynamically picked up by traefik and shows up in the dashboard, but the subdirectory gives a 404 error. I have even used PathPrefix with a regex to prevent the ending / error.
Here is my configuration.
Traefik's docker-compose:
version: '3'
services:
traefik:
image: traefik:v2.4
container_name: traefik
restart: unless-stopped
security_opt:
- no-new-privileges:true
networks:
- t2_proxy
ports:
- 80:80
- 443:443
volumes:
- /etc/localtime:/etc/localtime:ro
- /var/run/docker.sock:/var/run/docker.sock:ro
- ./data/traefik.yml:/traefik.yml:ro
- ./data/acme.json:/acme.json
- ./data/log:/var/log
labels:
- "traefik.enable=true"
- "traefik.http.routers.traefik.entrypoints=http"
- "traefik.http.routers.traefik.rule=Host(`domain.host.com`)"
- "traefik.http.middlewares.traefik-auth.basicauth.users=user:password"
- "traefik.http.middlewares.traefik-https-redirect.redirectscheme.scheme=https"
- "traefik.http.routers.traefik.middlewares=traefik-https-redirect"
- "traefik.http.routers.traefik-secure.entrypoints=https"
- "traefik.http.routers.traefik-secure.rule=Host(`domain.host.com`)"
- "traefik.http.routers.traefik-secure.middlewares=traefik-auth"
- "traefik.http.routers.traefik-secure.tls=true"
- "traefik.http.routers.traefik-secure.tls.certresolver=http"
- "traefik.http.routers.traefik-secure.service=api#internal"
fail2ban:
image: crazymax/fail2ban:latest
container_name: fail2ban
network_mode: "host"
cap_add:
- NET_ADMIN
- NET_RAW
volumes:
# - /var/log:/var/log:ro
- ./fail2ban/data:/data
- ./data/log:/var/log:ro
networks:
t2_proxy:
external: true
Here is my traefik.yml configuration file:
api:
dashboard: true
entryPoints:
http:
address: ":80"
https:
address: ":443"
providers:
docker:
endpoint: "unix:///var/run/docker.sock"
exposedByDefault: false
certificatesResolvers:
http:
acme:
email: email#email.com
storage: acme.json
httpChallenge:
entrypoint: http
log:
filePath: "/var/log/traefik.log"
level: DEBUG
accessLog:
filePath: "var/log/access.log"
filters:
statusCodes:
- "400-499"
retryAttempts: true
Here is the first proof-of-concept container I'm trying to expose. It's just portainer in a separate docker-compose:
version: '3'
services:
portainer:
image: portainer/portainer-ce:latest
container_name: portainer
restart: unless-stopped
security_opt:
- no-new-privileges:true
networks:
- t2_proxy
ports:
- "9000:9000"
volumes:
- /etc/localtime:/etc/localtime:ro
- /var/run/docker.sock:/var/run/docker.sock:ro
- ./data:/data
labels:
- "traefik.enable=true"
#web routers
- "traefik.http.routers.portainer.entrypoints=http"
- "traefik.http.routers.portainer.rule=Host(`domain.host.com`) && PathPrefix(`/portainer`)"
#- "traefik.http.routers.portainer.rule=Host(`domain.host.com`) && PathPrefix(`/portainer{regex:$$|/.*}`)"
#- "traefik.http.routers.portainer.rule=Path(`/portainer`)"
#- "traefik.http.routers.portainer.rule=PathPrefix(`/portainer{regex:$$|/.*}`)"
#middlewares
#- "traefik.http.routers.portainer.middlewares=portainer-stripprefix"
#- "traefik.http.middlewares.portainer-stripprefix.stripprefix.prefixes=/portainer"
- "traefik.http.middlewares.portainer-https-redirect.redirectscheme.scheme=https"
- "traefik.http.routers.portainer.middlewares=portainer-https-redirect"
#web secure rpiters
- "traefik.http.routers.portainer-secure.entrypoints=https"
- "traefik.http.routers.portainer-secure.rule=Host(`domain.host.com`) && PathPrefix(`/portainer`)"
#- "traefik.http.routers.portainer-secure.rule=Host(`domain.host.com`) && PathPrefix(`/portainer{regex:$$|/.*}`)"
#- "traefik.http.routers.portainer-secure.rule=Path(`/portainer`)"
#- "traefik.http.routers.portainer-secure.rule=PathPrefix(`/portainer{regex:$$|/.*}`)"
#- "traefik.http.routers.portainer-secure.middlewares=chain-basic-auth#users"
- "traefik.http.routers.portainer-secure.tls=true"
- "traefik.http.routers.portainer-secure.tls.certresolver=http"
- "traefik.http.routers.portainer-secure.service=portainer"
- "traefik.http.services.portainer.loadbalancer.server.port=9000"
- "traefik.docker.network=t2_proxy"
networks:
t2_proxy:
external: true
In summary, I navigate to domain.host.com, and it behaves properly by redirecting me to domain.host.com/dashboard. However, when I go to domain.host.com/portainer it gives a 404 error.
Please let me know if I should post any other details. I sense I am missing a very obvious bit of configuration, as this is my first time using Traefik. Thanks again for any help!

Answer 1

For future googlers
Alright, I figured it out tonight. Thank you, reddit.com/traefik user /u/Quafeinum for trying to help! I actually read the guide here: https://spad.uk/practical-configuration-of-traefik-as-a-reverse-proxy-for-docker/ by spad on linuxserver.io which helped me understand the labels better. The crux of the problem was
traefik.http.services.whoami-whoami.loadbalancer.server.scheme=https
Whatever that does, it was in all the examples, and I mindlessly copied it (there's a cautionary tale here). After removing it, the containers are properly exposed on HTTPS now. Verified with portainer and whoami.
Here is a link to a pastebin of the relevant docker-composes and yamls. This will get a functioning traefik that dynamically loads docker container whoami over HTTPS.
https://pastebin.com/AfBdz6Qm