Django 找不到 Pillow，但它是使用 docker 安装的答案

【问题标题】：Pillow is not found by Django thouhg it is installed using dockerDjango 找不到 Pillow，但它是使用 docker 安装的
【发布时间】：2021-01-11 02:01:05
【问题描述】：

您好，我正在关注本教程tutorial link。一切正常，但是当我运行下面的命令时，它说没有找到枕头，但已经安装了枕头。

docker-compose -f docker-compose.prod.yml exec app python manage.py migrate --noinput

这是错误：

employee.Employee.image: (fields.E210) Cannot use ImageField because Pillow is not installed.
    HINT: Get Pillow at https://pypi.org/project/Pillow/ or run command "python -m pip install Pillow".
students.Student.image: (fields.E210) Cannot use ImageField because Pillow is not installed.
    HINT: Get Pillow at https://pypi.org/project/Pillow/ or run command "python -m pip install Pillow".

然后我再次尝试使用波纹管命令安装

docker-compose -f docker-compose.prod.yml exec app python -m pip install Pillow

它说枕头是枕头已经安装

Requirement already satisfied: Pillow in /usr/local/lib/python3.8/site-packages (6.2.1)

这是我的 docker 文件

###########
# BUILDER #
###########

# pull official base image
FROM python:3.8.3-alpine as builder

# set work directory
WORKDIR /usr/src/app

# set environment variables
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

# install psycopg2 dependencies
RUN apk update \
    && apk add postgresql-dev gcc python3-dev zlib-dev jpeg-dev musl-dev


# lint
RUN pip install --upgrade pip
RUN pip install Pillow
COPY . .


# install dependencies
COPY ./requirements.txt .
RUN pip wheel --no-cache-dir --no-deps --wheel-dir /usr/src/app/wheels -r requirements.txt


#########
# FINAL #
#########

# pull official base image
FROM python:3.8.3-alpine

# create directory for the app user
RUN mkdir -p /home/app

# create the app user
RUN addgroup -S app && adduser -S app -G app

# create the appropriate directories
ENV HOME=/home/app
ENV APP_HOME=/home/app/web
RUN mkdir $APP_HOME
RUN mkdir $APP_HOME/staticfiles
RUN mkdir $APP_HOME/mediafiles
WORKDIR $APP_HOME

# install dependencies
RUN apk update && apk add libpq
COPY --from=builder /usr/src/app/wheels /wheels
COPY --from=builder /usr/src/app/requirements.txt .
RUN pip install --no-cache /wheels/*

# copy entrypoint-prod.sh
COPY ./entrypoint.prod.sh $APP_HOME

# copy project
COPY . $APP_HOME

# chown all the files to the app user
RUN chown -R app:app $APP_HOME

# change to the app user
USER app

# run entrypoint.prod.sh
ENTRYPOINT ["/home/app/web/entrypoint.prod.sh"]

请帮帮我。

【问题讨论】：

标签： python django docker python-imaging-library

【解决方案1】：

请尽量使用小写p开头的“pillow”。

【讨论】：

【解决方案2】：

在FINAL 部分下添加这两行，就在RUN apk update && apk add libpq 下方

# install pillow dependencies
RUN apk add --no-cache jpeg-dev zlib-dev
RUN apk add --no-cache --virtual .build-deps build-base linux-headers

这是因为BUILDER 在创建映像后删除了Pillow 所需的依赖项。在FINAL 映像中，Pillow 可用，但其所需的依赖项不可用。

【讨论】：