ERROR: No matching distribution found for Flask==2.0.2

[MrRespicio]

Describe the bug
I'm following the tutorial on https://docker-curriculum.com on Dockerfile section.

To Reproduce
Steps to reproduce the behavior:

1. I cloned the repository as instructed in the guide.
   $ git clone https://github.com/prakhar1989/docker-curriculum.git
   $ cd docker-curriculum/flask-app

2. And created a Dockerfile inside docker-curriculum/flask-app.

3. Here's my Docker file:
   FROM python:3.8 WORKDIR /usr/src/app COPY . . RUN pip install --no-cache-dir -r requirements.txt EXPOSE 5000 CMD ["python", "./app.py"]

4. And ran this command,
   docker build -t mlvrespicio/catnip .

Expected behavior
Docker images should be created.

Screenshots
I got this error while creating the docker image.
docker build -t mlvrespicio/catnip .
[+] Building 124.0s (8/8) FINISHED docker:default
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 340B 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 2B 0.0s
=> [internal] load metadata for docker.io/library/python:3.8 7.4s
=> [1/4] FROM docker.io/library/python:3.8@sha256:28f1561fe0279d606b8543d8e2cd54abb7ec58ad4bbca19a065db1229cf3aa27 11.7s
=> => resolve docker.io/library/python:3.8@sha256:28f1561fe0279d606b8543d8e2cd54abb7ec58ad4bbca19a065db1229cf3aa27 0.0s
=> => sha256:28f1561fe0279d606b8543d8e2cd54abb7ec58ad4bbca19a065db1229cf3aa27 1.86kB / 1.86kB 0.0s
=> => sha256:4f372691895ada3e85a9ebb181ad24dfe319a56cbd1a54949a0142a5a0c40de3 245B / 245B 0.8s
=> => sha256:47c0268b48e9672b440eb5c3bf3f98196336ca02bcc0a1c7ccc06466b99bb3f0 2.85MB / 2.85MB 8.9s
=> => sha256:d80126e7fe0b93c09abbaeb0c9e41a82da66a59f7904ca4967def0a54e756d53 17.28MB / 17.28MB 10.7s
=> => sha256:c3ac277830cfe6d4b092c9e58f6295ac79f6091e7aa602c505e7c887c6b6f513 2.01kB / 2.01kB 0.0s
=> => sha256:8902dbffd68e9befb64c37179f3bd802af491cd46ce0246aac21e97e6c57fdc7 7.56kB / 7.56kB 0.0s
=> => extracting sha256:d80126e7fe0b93c09abbaeb0c9e41a82da66a59f7904ca4967def0a54e756d53 0.5s
=> => extracting sha256:4f372691895ada3e85a9ebb181ad24dfe319a56cbd1a54949a0142a5a0c40de3 0.0s
=> => extracting sha256:47c0268b48e9672b440eb5c3bf3f98196336ca02bcc0a1c7ccc06466b99bb3f0 0.2s
=> [internal] load build context 0.0s
=> => transferring context: 508B 0.0s
=> [2/4] WORKDIR /usr/src/app 0.1s
=> [3/4] COPY . . 0.0s
=> ERROR [4/4] RUN pip install --no-cache-dir -r requirements.txt 104.6s

[4/4] RUN pip install --no-cache-dir -r requirements.txt:
16.74 WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/flask/
32.28 WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/flask/
48.32 WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/flask/
65.37 WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/flask/
84.41 WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/flask/
99.46 ERROR: Could not find a version that satisfies the requirement Flask==2.0.2 (from versions: none)
99.46 ERROR: No matching distribution found for Flask==2.0.2

---

Dockerfile:10

8 |
9 | # install dependencies
10 | >>> RUN pip install --no-cache-dir -r requirements.txt
11 |
12 | # tell the port number the container should expose

ERROR: failed to solve: process "/bin/sh -c pip install --no-cache-dir -r requirements.txt" did not complete successfully: exit code:

Desktop (please complete the following information):

• OS: Windows 11
• Docker Version 24.0.5

Additional context
Add any other context about the problem here.

[mdetrano]

I had this issue and for me this was the result of tweaks I had made in the firewall preventing the container from reaching the internet.

[mperdikeas]

Just to say I am facing the exact same issue on Ubuntu 20.04 (in case that has any bearing) and with a clean git clone ("git status -s" is clean). I append my trace:

[mperdikeas]

Ok, so in the end, adding "--network host" worked. I.e. the following command:

docker build . --network host -t /catnip

This was mentioned here:

StefanScherer/dockerfiles-windows#270 (comment)