Katacode Traefik tutorial error - container not created - docker

Question

I am trying out the Katacoda playground for Load Balance Containers using Traefik - https://www.katacoda.com/courses/traefik/deploy-load-balancer:
Here is the exact Docker compose script in the tutorial to start a Traefik node and 2 test containers:
image: traefik
command: --web --docker --docker.domain=docker.localhost --logLevel=DEBUG
ports:
- "80:80"
- "8080:8080"
- "443:443"
volumes:
- /var/run/docker.sock:/var/run/docker.sock
- /dev/null:/traefik.toml
machine:
image: katacoda/docker-http-server
labels:
- "traefik.backend=machine-echo"
- "traefik.frontend.rule=Host:machine-echo.example.com"
echo:
image: katacoda/docker-http-server:v2
labels:
- "traefik.backend=echo"
- "traefik.frontend.rule=Host:echo-echo.example.com"
I run Docker-Compose command, as given in tutorial:
$ docker-compose up -d
Creating tutorial_traefik_1 ... done
Creating tutorial_echo_1 ... done
Creating tutorial_machine_1 ... done
However when I check the container list, I can see only 2 containers are created. The Traefik container is not created:
$ docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
35e87a3ff6ed katacoda/docker-http-server "/app" 11 seconds ago Up 9 seconds 80/tcp tutorial_machine_1
a455019d16be katacoda/docker-http-server:v2 "/app" 11 seconds ago Up 9 seconds 80/tcp tutorial_echo_1
The next step fails too. This may be because the Traefik container is not running:
$ curl -H Host:machine-echo.example.com http://host01
curl: (7) Failed to connect to host01 port 80: Connection refused
Can anyone replicate this tutorial and please let me know the cause and fix for this error?

Answer 1

Just run on this today, you must hardcode traefik version to 1.7.32
traefik:
image: traefik:1.7.32
command: --web --docker --docker.domain=docker.localhost --logLevel=DEBUG
ports:
- "80:80"
- "8080:8080"
- "443:443"
volumes:
- /var/run/docker.sock:/var/run/docker.sock
- /dev/null:/traefik.toml
machine:
image: katacoda/docker-http-server
labels:
- "traefik.backend=machine-echo"
- "traefik.frontend.rule=Host:machine-echo.example.com"
echo:
image: katacoda/docker-http-server:v2
labels:
- "traefik.backend=echo"
- "traefik.frontend.rule=Host:echo-echo.example.com"