如何构建 Docker 镜像？

Question

我有一个名为 docker 的目录，其中包含以下两个文件：

docker:
      |_Dockerfile
      |_main.py

Dockerfile 如下所示：

#Specifying the base image
FROM python:3.10
#here the dockerfile is pulling the python 3.10 from docker hub which already has python installed so we have all the things we need to have python in our container.

ADD main.py.
#Here we added the python file that we want to run in docker and define its location.

RUN pip install requests pygame
#Here we installed the dependencies, we are using the pygame library in our main.py file so we have to use the pip command for installing the library

CMD [ "python3" "./main.py" ]
#lastly we specified the entry command this line is simply running python ./main.py in our container terminal

ma​​in.py 文件如下所示：

# Simple pygame program
# Import and initialize the pygame library
import pygame
pygame.init()

# Set up the drawing window
screen = pygame.display.set_mode([500, 500])

# Running the game until the user asks to quit
running = True
while running:

    # creating an if statement for the close button
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    # Filling the background color with a gray
    screen.fill((55, 55, 55))

    # Drawing a solid purple circle in the center
    pygame.draw.circle(screen, (0, 0, 251), (251, 251), 74)
    # Flip the display
    pygame.display.flip()

# Done! Time to quit.
pygame.quit()

我打开了我的 cmd（我在 Windows 10 上）并导航到 docker 目录并执行了以下命令：

docker image build -t python-game .

这是我收到的输出

[+] Building 0.1s (2/2) FINISHED
 => [internal] load build definition from Dockerfile                                                               0.0s
 => => transferring dockerfile: 683B                                                                               0.0s
 => [internal] load .dockerignore                                                                                  0.0s
 => => transferring context: 2B                                                                                    0.0s
failed to solve with frontend dockerfile.v0: failed to create LLB definition: dockerfile parse error line 5: ADD requires at least two arguments, but only one was provided. Destination could not be determined.

Answer 1

只是大量的无效语法错误。而不是

ADD main.py.
#Here we added the python file that we want to run in docker and define its location.

RUN pip install requests pygame
#Here we installed the dependencies, we are using the pygame library in our main.py file so we have to use the pip command for installing the library

CMD [ "python3" "./main.py" ]

使用

ADD main.py /main.py

RUN pip install requests pygame

CMD [ "python3", "/main.py" ]

Answer 2

您在 ADD 中缺少第二个参数，即目标目录。请尝试以下操作，例如 ./ 将 main.py 复制到当前目录。

ADD main.py ./