Question

我正在遵循使用docker和python应用程序的Docker-getting started指南，但是当docker到达命令时：

docker run -p 80:80 username/repo:tag

我收到以下错误消息：

Traceback (most recent call last):
  File "app.py", line 1, in <module>
   from flask import Flask
ImportError: No module named flask

我在运行Flask和which flask

时安装了which python

/usr/local/bin/flask
/usr/local/bin/python

被退回。然而，当我执行sudo pip install Flask时，我得到了

Requirement already satisfied: flask in ./python2.7/site-packages
Requirement already satisfied: click>=2.0 in ./python2.7/site-
packages (from flask)
Requirement already satisfied: Werkzeug>=0.7 in ./python2.7/site-
packages (from flask)
Requirement already satisfied: Jinja2>=2.4 in ./python2.7/site-
packages (from flask)
Requirement already satisfied: itsdangerous>=0.21 in 
./python2.7/site-packages (from flask)
Requirement already satisfied: MarkupSafe>=0.23 in ./python2.7/site-
packages (from Jinja2>=2.4->flask)

这显然是一个不同的目录。我最初的想法是，我使用来自两个不同目录的python，这就是我无法运行docker命令的原因。但我也是一个菜鸟，并且不知道如何开始排除故障并解决这个问题。如果有人在这里给我一些指示，我将非常感激。谢谢你。

修改的这是我的Dockerfile

# 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 --proxy 
https://proxy:8080 --trusted-host pypi.python.org

# 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

Answer 1

不是问题的直接答案，但这可以为您节省大量时间。

每个docker命令都会向图像添加一个新图层。在构建图像时，docker将尝试找出需要重新构建的图层。您可能会在每次构建时更改应用程序中的文件。这是第一层，因此您每次构建时都必须安装需求。这可以增加额外的等待。

让我们复制requirements.txt并首先安装要求。然后，在我们更改要求之前，将缓存该层。

# Use an official Python runtime as a parent image
FROM python:2.7-slim

# Install any needed packages specified in requirements.txt
COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt --proxy https://proxy:8080 --trusted-host pypi.python.org

ADD . /app    
WORKDIR /app
EXPOSE 80

构建dockerfile时，尝试可视化它创建的图层以及这将有助于减少构建时间。

Answer 2

应该包含pip install指令，您可能希望将ADD放在WORKDIR之前，而且您似乎没有正确的ENTRYPOINT < / p>

# Use an official Python runtime as a parent image
FROM python:2.7-slim

# Copy the current directory contents into the container at /app
ADD . /app

# Set the working directory to /app
WORKDIR /app

# Install any needed packages specified in requirements.txt
RUN pip install -r requirements.txt --proxy \
https://proxy:8080 --trusted-host pypi.python.org

# 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
## Where is the ENTRYPOINT ?

Docker使用不同的python作为系统

2 个答案: