我正在尝试学习Docker。我有一个Hello World Django服务器应用程序。当我尝试使用import requests
data = {"j_username": "admin","j_password":"password"}
r = requests.post('http://(serverip):8080/pentaho/j_spring_security_check', data = data)
运行服务器时，服务器无法访问。但是当我使用Dockerfile时，我可以访问它。
我的问题是为什么，特别是当它们非常相似时。
我的Dockerfile：
docker-compose使用Dockerfile运行服务器时使用的命令：
FROM python:3
# Set the working directory to /app
WORKDIR /bryne
# Copy the current directory contents into the container at /app
ADD . /bryne
# Install any needed packages specified in requirements.txt
RUN pip install --trusted-host pypi.python.org -r requirements.txt
# EXPOSE port 8000 to allow communication to/from server
EXPOSE 8000
# CMD specifcies the command to execute to start the server running.
CMD ["python", "manage.py", "runserver", "0.0.0.0:8000"]
# done!
docker build -t swyne-latest
结果：无法访问docker run swyne-latest上的服务器
我的127.0.0.1:8000：
docker-compose.yml使用docker-compose运行服务器时使用的命令：
version: '3'
services:
web:
build: .
command: bash -c "python manage.py makemigrations && python manage.py migrate && python manage.py runserver 0.0.0.0:8000"
container_name: swyne
volumes:
- .:/bryne
ports:
- "8000:8000"
结果：能够通过docker-compose up访问我的服务器
谢谢
编辑：Dockerfile构建的输出：
127.0.0.1:8000 $ docker build -t swyne-latest .
Sending build context to Docker daemon 60.15MB
Step 1/6 : FROM python:3
3: Pulling from library/python
05d1a5232b46: Already exists
5cee356eda6b: Already exists
89d3385f0fd3: Already exists
80ae6b477848: Already exists
28bdf9e584cc: Already exists
523b203f62bd: Pull complete
e423ae9d5ac7: Pull complete
adc78e8180f7: Pull complete
60c9f1f1e6c6: Pull complete
Digest: sha256:5caeb1a2119661f053e9d9931c1e745d9b738e2f585ba16d88bc3ffcf4ad727b
Status: Downloaded newer image for python:3
---> 7a35f2e8feff
Step 2/6 : WORKDIR /bryne
---> Running in 9ee8283c6cc6
Removing intermediate container 9ee8283c6cc6
---> 5bbd14170c84
Step 3/6 : ADD . /bryne
---> 0128101457f5
Step 4/6 : RUN pip install --trusted-host pypi.python.org -r requirements.txt
---> Running in 55ab661b1b55
Collecting Django>=2.1 (from -r requirements.txt (line 1))
Downloading https://files.pythonhosted.org/packages/32/ab/22530cc1b2114e6067eece94a333d6c749fa1c56a009f0721e51c181ea53/Django-2.1.2-py3-none-any.whl (7.3MB)
Collecting pytz (from Django>=2.1->-r requirements.txt (line 1))
Downloading https://files.pythonhosted.org/packages/30/4e/27c34b62430286c6d59177a0842ed90dc789ce5d1ed740887653b898779a/pytz-2018.5-py2.py3-none-any.whl (510kB)
Installing collected packages: pytz, Django
Successfully installed Django-2.1.2 pytz-2018.5
Removing intermediate container 55ab661b1b55
---> dce5400552b2
Step 5/6 : EXPOSE 8000
---> Running in c74603a76b54
Removing intermediate container c74603a76b54
---> ee5ef2bf2999
Step 6/6 : CMD ["python", "manage.py", "runserver", "127.0.0.1:8000"]
---> Running in 4f5ea428f801
Removing intermediate container 4f5ea428f801
---> 368f73366b69
Successfully built 368f73366b69
Successfully tagged swyne-latest:latest
答案 0 :(得分：0)
我认为与docker-compose up不同的是，docker run swyne-latest不允许您访问127.0.0.1:8000上的Web应用程序。
因为docker-compose.yml文件（由docker-compose本身而非docker读取）指定了许多参数，尤其是端口映射，否则应将其作为CLI参数传递。 docker run。
您是否可以尝试运行docker run -p 8000:8000？
此外，我猜想command: bash -c "python manage.py makemigrations && python manage.py migrate && python manage.py runserver 0.0.0.0:8000"行应该使用Dockerfile或CMD伪指令放置在ENTRYPOINT本身内，不 docker-compose.yml文件。
实际上，我只是看了您的docker build命令的输出，并且存在一个正交的问题：
命令
CMD ["python", "manage.py", "runserver", "127.0.0.1:8000"]
应替换为
CMD ["python", "manage.py", "runserver", "0.0.0.0:8000"]
（有关此问题的更多反馈，请参见此SO answer，尽管使用的是另一种语言，Java而不是Python。）
顺便说一句，编译Dockerfile的完整命令不是docker build -t swyne-latest而是docker build -t swyne-latest .（最后一个点对应于Docker构建上下文的文件夹）。