Docker SWARM Not working - docker

Question

I"m following the tutorial from https://docs.docker.com/get-started/part3/ on a Mac. This tutorial is to setup a Docker service using swarm node. However, I'm getting Empty reply from server if I goto http://localhost. I have verified that port 80 is with a Docker process, and the Docker container are running as well.
Mac-Machine: docker stack deploy -c docker-compose.yml getstartedlab
Creating network getstartedlab_webnet
Creating service getstartedlab_web
Mac-Machine:docker user1$ lsof -i tcp:80
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
com.docke 7592 user1 44u IPv4 0xfc021b13bc914389 0t0 TCP *:http (LISTEN)
Mac-Machine:docker user1$ curl http://localhost
curl: (52) Empty reply from server
Mac-Machine:docker user1$ docker service ls
ID NAME MODE REPLICAS IMAGE
w4dghr7jcpca getstartedlab_web replicated 5/5 dockhub-user1/get-started:part1
Mac-Machine:docker user1$ docker service ps w4dghr7jcpca
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
4oykrq8ge8yl getstartedlab_web.1 dockhub-user1/get-started:part1 moby Running Running about a minute ago
ba1n3m1pis2f getstartedlab_web.2 dockhub-user1/get-started:part1 moby Running Running about a minute ago
kmy8n4tm0n44 getstartedlab_web.3 dockhub-user1/get-started:part1 moby Running Running about a minute ago
cyeyozw6u8x7 getstartedlab_web.4 dockhub-user1/get-started:part1 moby Running Running about a minute ago
0evm9skw7p44 getstartedlab_web.5 dockhub-user1/get-started:part1 moby Running Running about a minute ago
Mac-Machine:docker user1$ docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
5223c52b2014 dockhub-user1/get-started#sha256:2d3934a04a4aecc453652678489b2d96ce8d3dc5457aa8afdaeb71dbeff236ff "python app.py" 2 minutes ago Up About a minute 80/tcp getstartedlab_web.1.4oykrq8ge8ylw3ilbufxdp4t0
910b7b7521b3 dockhub-user1/get-started#sha256:2d3934a04a4aecc453652678489b2d96ce8d3dc5457aa8afdaeb71dbeff236ff "python app.py" 2 minutes ago Up About a minute 80/tcp getstartedlab_web.4.cyeyozw6u8x7j1zy1k82dugrn
d3ebd24cfe9a dockhub-user1/get-started#sha256:2d3934a04a4aecc453652678489b2d96ce8d3dc5457aa8afdaeb71dbeff236ff "python app.py" 2 minutes ago Up 2 minutes 80/tcp getstartedlab_web.5.0evm9skw7p44npujg6nbhckmy
ba29ffbdf2ce dockhub-user1/get-started#sha256:2d3934a04a4aecc453652678489b2d96ce8d3dc5457aa8afdaeb71dbeff236ff "python app.py" 2 minutes ago Up About a minute 80/tcp getstartedlab_web.2.ba1n3m1pis2flttytx87nucvb
6d8af1744b75 dockhub-user1/get-started#sha256:2d3934a04a4aecc453652678489b2d96ce8d3dc5457aa8afdaeb71dbeff236ff "python app.py" 2 minutes ago Up About a minute 80/tcp getstartedlab_web.3.kmy8n4tm0n44jgb1tc34qgeww
Here is the docker-compose.yml
version: "3"
services:
web:
# replace username/repo:tag with your name and image details
image: dockhub-user1/get-started:part1
deploy:
replicas: 5
resources:
limits:
cpus: "0.1"
memory: 50M
restart_policy:
condition: on-failure
ports:
- "80:80"
networks:
- webnet
networks:
webnet:
Image dockhub-user1/get-started:part1 was created using the following Docker file.
# Use an official Python runtime as a parent image
FROM python:2.7-slim
# Set the working directory to /app
WORKDIR /app
# Copy the current directory contents into the container at /app
ADD . /app
# Install any needed packages specified in requirements.txt
RUN pip install -r requirements.txt
# Make port 80 available to the world outside this container
EXPOSE 80
# Define environment variable
ENV NAME World
# Run app.py when the container launches
CMD ["python", "app.py"]
Here is the app.py file
from flask import Flask
from redis import Redis, RedisError
import os
import socket
# Connect to Redis
redis = Redis(host="redis", db=0, socket_connect_timeout=2, socket_timeout=2)
app = Flask(__name__)
#app.route("/")
def hello():
try:
visits = redis.incr("counter")
except RedisError:
visits = "<i>cannot connect to Redis, counter disabled</i>"
html = "<h3>Hello {name}!</h3>" \
"<b>Hostname:</b> {hostname}<br/>" \
"<b>Visits:</b> {visits}"
return html.format(name=os.getenv("NAME", "world"), hostname=socket.gethostname(), visits=visits)
if __name__ == "__main__":
app.run(host='0.0.0.0', port=80)

Answer 1

After spending a whole afternoon debugging the issue, I found out that it was caused by Kubernetes. Stopping it from Docker Desktop resolved the issue.