【发布时间】：2021-12-01 01:04:02
【问题描述】：
无论我尝试什么，我的 Docker 容器都在使用 Python 3.10，而不是我需要和指定的，即 Python 3.7。如何强制 Docker 为特定的图像/容器使用 3.7？
我是新手 Docker 用户，其中一些 Docker 配置文件不是我写的，请原谅我的无知。
错误
这是错误。您可以清楚地看到 Docker 使用的是 Python 3.10。
website_1 | Traceback (most recent call last):
website_1 | File "/code/manage.py", line 10, in <module>
website_1 | execute_from_command_line(sys.argv)
website_1 | File "/usr/local/lib/python3.10/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
website_1 | utility.execute()
website_1 | File "/usr/local/lib/python3.10/site-packages/django/core/management/__init__.py", line 357, in execute
website_1 | django.setup()
website_1 | File "/usr/local/lib/python3.10/site-packages/django/__init__.py", line 24, in setup
website_1 | apps.populate(settings.INSTALLED_APPS)
website_1 | File "/usr/local/lib/python3.10/site-packages/django/apps/registry.py", line 120, in populate
website_1 | app_config.ready()
website_1 | File "/code/website/apps.py", line 11, in ready
website_1 | import website.signals
website_1 | File "/code/website/signals.py", line 4, in <module>
website_1 | from wand.image import Image, Color
website_1 | File "/usr/local/lib/python3.10/site-packages/wand/image.py", line 3383, in <module>
website_1 | class Iterator(Resource, collections.Iterator):
website_1 | AttributeError: module 'collections' has no attribute 'Iterator'
Docker 配置文件
我的 Dockerfile
FROM python:3.7
# Setup some other prereqs needed:
RUN apt-get update && apt-get --assume-yes install imagemagick ghostscript sqlite3
# Set the stdout/stderr streams in Python to be unbuffered
ENV PYTHONUNBUFFERED 1
# Create a system user which we'll use later.
# We're using the 'apache' user since that's what we're trying to map
# outside the container -- it could be called anything, but apache is convenient
RUN useradd -u 48 apache
RUN groupmod -g 48 apache
# The RUN instruction will execute any commands in a new layer on top of the current image and commit the results.
# The resulting committed image will be used for the next step in the Dockerfile.
RUN mkdir /code
# The WORKDIR instruction sets the working directory for any RUN, CMD, ENTRYPOINT, COPY and ADD instructions
# that follow it in the Dockerfile. If the WORKDIR doesn’t exist, it will be created even if it’s not used
# in any subsequent Dockerfile instruction.
WORKDIR /code
# COPY and RUN the requirements.txt into the docker container
COPY requirements.txt /code/
RUN pip3.7 install -r requirements.txt
# Our local user needs write access to a website and static files
RUN chown -R apache /code/
COPY . /code/
#Run the process as our local user:
USER apache
COPY docker-entrypoint.sh docker-entrypoint.sh
CMD ["/code/docker-entrypoint.sh"]
docker-compose.yml:
version: '3'
services:
db:
image: 'postgres'
restart: always
ports:
- '1456'
environment:
- POSTGRES_DB=databasename
- POSTGRES_USER=username
- POSTGRES_PASSWORD=passwordname
volumes:
- postgres-data:/var/lib/postgresql/data
website:
build:
context: .
dockerfile: Dockerfile
restart: always
command: python3 manage.py runserver 0.0.0.0:8000
ports:
- '127.0.0.1:8985:8000'
volumes:
- .:/code
depends_on:
- db
command: ["./docker-entrypoint.sh", "db", "python", "manage.py"]
links:
- "db:database"
volumes:
postgres-data:
还有docker-entrypoint.sh：
#!/bin/bash
# Collect static files
echo "Collecting static files"
python manage.py collectstatic --noinput
# Apply database migrations
echo "Running makemigrations and migrate"
python manage.py makemigrations
python manage.py migrate
echo "Running makemigrations and migrate explicitly to website (often fixes some first-time run issues)"
python manage.py makemigrations website
python manage.py migrate website
# Start server
echo "Starting server"
python manage.py runserver 0.0.0.0:8000
作为更新，我能够通过完全擦除映像、容器、重新启动计算机、Docker 等并重建来“修复”此问题。
另外，如果它对其他人有用，对我有用的一个直觉检查是在交互式 shell 中运行图像并检查它使用的是哪个 Python 版本。
$ docker run --rm -it makelab_image sh
$ which python
/usr/local/bin/python
$ python --version
Python 3.7.12
【问题讨论】：
标签： python python-3.x django docker docker-compose