Hi all,
I'm new to the concepts here but getting my head around it but am stuck so thought I'd ask here.
My setup
- a flask app running on port 8000
- traefik running
- a network running
This is done via docker-compose. I'm on ubuntu 18.04.
Before Traefik:
The flask app runs well by itself if I have no proxy setup at all. I can head to localhost:8000 and it works a treat. That's great.
What I expect:
I want to test a reverse proxy. So I want to head to localhost:5000 and have Traefik grab the data from 8000 and send it to the browser. I assume that's how this is meant to work? I ask this as I'm really fighting what I thought would be quite simple. In my mind, all traffic going through Traefik would show to the end user as being on port 5000 (so that all backend activity/addresses are hidden).
What's happening:
I am heading to localhost:5000 and I get a 404 error. Not only that, the image that's meant to go with the 404 error is showing its url as http://localhost:8000/static/images/404.png Isn't the port 8000 never meant to show to the end user?
My setup:
docker-compose.yml
version: '3'
services:
flask:
# build the Dockerfile
build: .
image: logrr:1.0.0
container_name: flask
restart: always
command: >
gunicorn -b 0.0.0.0:8000
--access-logfile -
--reload
"logrr.app:create_app()"
volumes:
- '.:/logrr'
networks:
- proxy
ports:
- "8000"
labels:
# This will mark this docker service as a backend with name flask”
# It will create a rule in Traefik that all traffic coming from localhost
# should be redirected to this docker service to port 8000.
- "traefik.enable=true"
- "traefik.backend=flask"
- "traefik.frontend.rule=Host:localhost"
- "traefik.port=8000"
- "traefik.docker.network=proxy"
traefik:
image: traefik # The official Traefik docker image
command: --api --docker --loglevel=debug # Enables the web UI and tells Traefik to listen to docker
ports:
- "443:443" # The encrypted port
- "80:80" # The HTTP port
- "8080:8080" # The Web UI (enabled by --api)
- "8000:8000" # the flask port. Will this work?
- "5000:5000" # the traefik frontend port. Will this work?
volumes:
- /var/run/docker.sock:/var/run/docker.sock # Traefik auto-detects containers on the network by reading from the Docker socket
- ./traefik/traefik.toml:/etc/traefik/traefik.toml # this is the Traefik configuration file
- ./ssl:/ssl # this directory will store self-signed certificates for enabling TLS (https) connections to Traefik
labels:
# accept connections to entry point 'https' & 'http' (these are defined in traefik.toml)
- traefik.frontend.entryPoints=http localhost::5000
# if the connection matches this front end rule, route the connection to this container
# in this case, the connection must have a host name of 'traefik.docker.localhost'
- traefik.frontend.rule=Host:traefik.docker.localhost
# route frontend rule matches to port 8080 on this container
- traefik.port=8080
# enable Traefik to route to this container, this isn't always needed (I'll explain more when going over treafik.toml)
- traefik.enable=true
# add this container to the 'proxy' network
networks:
proxy:
container_name: 'traefik' # set the container name, it defaults to the service name if not defined
expose:
- 8080 # Exposed ports are only accessible to other containers on the same Docker network like so -> http://CONTAINER:PORT
networks:
proxy:
Here is my traefik.toml
debug = false
logLevel = "ERROR"
defaultEntryPoints = ["https","http"]
[entryPoints]
[entryPoints.http]
address = ":5000"
[retry]
Can anyone see what I'm doing wrong? The Traefik dashboard shows front end and back end for the flask app. It's just not behaving like I am expecting. Right now I don't want encryption or anything, I just want it to work in testing on my local machine.
Any help would be massively appreciated. I've spent days, had a few "ahah!" moments but really am at a wall now.