当我运行flask run时，暴露了localhost端口，并且应用程序没有错误加载，但是当我运行docker-compose up -d --build时，映像已构建并正在运行，但是localhost没有暴露。检查该容器表明它已正确构建，并且仍在运行。我已经查看了this github issue和this stackoverflow，这表明问题是network_host mode，但我没有使用。它还建议在端口映射中手动使用0.0.0.0而不是127.0.0.1，但这没有帮助。
docker-compose.yml
#~/Projects/mysite/docker-compose.yml
version: '3.7'
services:
flask-dev:
build:
context: .
dockerfile: Dockerfile
target: development
image: "site-development"
ports:
- "5000:5000"
volumes:
- ".:/personal_site"
tty: true
Dockerfile
#~/Projects/mysite/Dockerfile
# multi build stages
#https://docs.docker.com/develop/develop-images/multistage-build/
# ==================================== BASE ====================================
FROM python:3.8-slim-buster AS base
WORKDIR /personal_site
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1
ENV FLASK_APP mysite
ENV FLASK_ENV development
ENV FLASK_DEBUG 1
RUN apt-get update
RUN apt-get install -y \
gcc
RUN pip install --upgrade pip
COPY . .
# ================================= DEVELOPMENT ================================
FROM base as development
COPY ./requirements-dev.txt /personal_site/requirements-dev.txt
RUN pip install -r requirements-dev.txt
CMD ["flask", "run"]
# ================================= PRODUCTION =================================
FROM base as production
COPY ./requirements-prod.txt /personal_site/requirements-prod.txt
RUN pip install -r requirements-prod.txt
# =================================== MANAGE ===================================
FROM base as manage
COPY ./requirements-dev.txt /personal_site/requirements-dev.txt
RUN pip install -r requirements-dev.txt
Docker版本：
docker-compose version 1.25.5, build 8a1c60f6
Docker version 19.03.13, build 4484c46d9d
文件夹结构：
#~/Projects/mysite
- docker-compose.yml
- Dockerfile
- mysite/__init__.py
使用flask run从cmd运行
* Serving Flask app "mysite" (lazy loading)
* Environment: development
* Debug mode: on
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
* Restarting with stat
* Debugger is active!
* Debugger PIN: 331-834-605
Docker-compose stout
stephen@stephen:~/Projects/mysite$ docker-compose up -d --build
docker-compose up -d --build
Building flask-dev
Step 1/15 : FROM python:3.8-slim-buster AS base
---> 6cf621cb1327
Step 2/15 : WORKDIR /personal_site
---> Using cache
---> 751c8aa117f3
Step 3/15 : ENV PYTHONDONTWRITEBYTECODE 1
---> Using cache
---> 8b29a6862b7a
Step 4/15 : ENV PYTHONUNBUFFERED 1
---> Using cache
---> a5f8751c9c12
Step 5/15 : ENV FLASK_APP mysite
---> Using cache
---> bc212892cc17
Step 6/15 : ENV FLASK_ENV development
---> Using cache
---> 9ffa29dcea47
Step 7/15 : ENV FLASK_DEBUG 1
---> Using cache
---> 9b2e876d307a
Step 8/15 : RUN apt-get update
---> Using cache
---> bd323216e65a
Step 9/15 : RUN apt-get install -y gcc
---> Using cache
---> 3105c1727b5d
Step 10/15 : RUN pip install --upgrade pip
---> Using cache
---> 6f8fb5bc0015
Step 11/15 : COPY . .
---> 76ff5e26c0a9
Step 12/15 : FROM base as development
---> 76ff5e26c0a9
Step 13/15 : COPY ./requirements-dev.txt /personal_site/requirements-dev.txt
---> 06e9dac6dec6
Step 14/15 : RUN pip install -r requirements-dev.txt
---> Running in f4743afd3a31
Collecting click==7.1.2
Downloading click-7.1.2-py2.py3-none-any.whl (82 kB)
Collecting Flask==1.1.2
Downloading Flask-1.1.2-py2.py3-none-any.whl (94 kB)
Collecting itsdangerous==1.1.0
Downloading itsdangerous-1.1.0-py2.py3-none-any.whl (16 kB)
Collecting Jinja2==2.11.2
Downloading Jinja2-2.11.2-py2.py3-none-any.whl (125 kB)
Collecting MarkupSafe==1.1.1
Downloading MarkupSafe-1.1.1-cp38-cp38-manylinux1_x86_64.whl (32 kB)
Collecting Werkzeug==1.0.1
Downloading Werkzeug-1.0.1-py2.py3-none-any.whl (298 kB)
Collecting pytest==6.0.2
Downloading pytest-6.0.2-py3-none-any.whl (270 kB)
Collecting black==19.10b0
Downloading black-19.10b0-py36-none-any.whl (97 kB)
Collecting flake8==3.8.3
Downloading flake8-3.8.3-py2.py3-none-any.whl (72 kB)
Collecting flake8-blind-except==0.1.1
Downloading flake8-blind-except-0.1.1.tar.gz (2.5 kB)
Collecting flake8-debugger==3.2.1
Downloading flake8-debugger-3.2.1.tar.gz (4.2 kB)
Collecting flake8-docstrings==1.5.0
Downloading flake8_docstrings-1.5.0-py2.py3-none-any.whl (5.5 kB)
Collecting flake8-isort==4.0.0
Downloading flake8_isort-4.0.0-py2.py3-none-any.whl (14 kB)
Collecting isort==5.5.2
Downloading isort-5.5.2-py3-none-any.whl (95 kB)
Collecting pep8-naming==0.11.1
Downloading pep8_naming-0.11.1-py2.py3-none-any.whl (8.4 kB)
Collecting pluggy<1.0,>=0.12
Downloading pluggy-0.13.1-py2.py3-none-any.whl (18 kB)
Collecting toml
Downloading toml-0.10.1-py2.py3-none-any.whl (19 kB)
Collecting more-itertools>=4.0.0
Downloading more_itertools-8.5.0-py3-none-any.whl (44 kB)
Collecting attrs>=17.4.0
Downloading attrs-20.2.0-py2.py3-none-any.whl (48 kB)
Collecting py>=1.8.2
Downloading py-1.9.0-py2.py3-none-any.whl (99 kB)
Collecting iniconfig
Downloading iniconfig-1.0.1-py3-none-any.whl (4.2 kB)
Collecting packaging
Downloading packaging-20.4-py2.py3-none-any.whl (37 kB)
Collecting appdirs
Downloading appdirs-1.4.4-py2.py3-none-any.whl (9.6 kB)
Collecting regex
Downloading regex-2020.9.27-cp38-cp38-manylinux2010_x86_64.whl (675 kB)
Collecting pathspec<1,>=0.6
Downloading pathspec-0.8.0-py2.py3-none-any.whl (28 kB)
Collecting typed-ast>=1.4.0
Downloading typed_ast-1.4.1-cp38-cp38-manylinux1_x86_64.whl (768 kB)
Collecting pyflakes<2.3.0,>=2.2.0
Downloading pyflakes-2.2.0-py2.py3-none-any.whl (66 kB)
Collecting mccabe<0.7.0,>=0.6.0
Downloading mccabe-0.6.1-py2.py3-none-any.whl (8.6 kB)
Collecting pycodestyle<2.7.0,>=2.6.0a1
Downloading pycodestyle-2.6.0-py2.py3-none-any.whl (41 kB)
Requirement already satisfied: setuptools in /usr/local/lib/python3.8/site-packages (from flake8-blind-except==0.1.1->-r requirements-dev.txt (line 10)) (50.3.0)
Collecting pydocstyle>=2.1
Downloading pydocstyle-5.1.1-py3-none-any.whl (35 kB)
Collecting testfixtures<7,>=6.8.0
Downloading testfixtures-6.14.2-py2.py3-none-any.whl (89 kB)
Collecting flake8-polyfill<2,>=1.0.2
Downloading flake8_polyfill-1.0.2-py2.py3-none-any.whl (7.3 kB)
Collecting six
Downloading six-1.15.0-py2.py3-none-any.whl (10 kB)
Collecting pyparsing>=2.0.2
Downloading pyparsing-2.4.7-py2.py3-none-any.whl (67 kB)
Collecting snowballstemmer
Downloading snowballstemmer-2.0.0-py2.py3-none-any.whl (97 kB)
Building wheels for collected packages: flake8-blind-except, flake8-debugger
Building wheel for flake8-blind-except (setup.py): started
Building wheel for flake8-blind-except (setup.py): finished with status 'done'
Created wheel for flake8-blind-except: filename=flake8_blind_except-0.1.1-py3-none-any.whl size=3045 sha256=ee8ec372f4ef9ba5aa472cc70cf2b34462c2e5742c4431a88d4811ba3c6941b9
Stored in directory: /root/.cache/pip/wheels/7f/70/4f/6002af5c24a072eec72570bf0a265bf95f1968c4508563b6cd
Building wheel for flake8-debugger (setup.py): started
Building wheel for flake8-debugger (setup.py): finished with status 'done'
Created wheel for flake8-debugger: filename=flake8_debugger-3.2.1-py3-none-any.whl size=4201 sha256=0399bc5b93a43d4f70912c25e9251000b1003a04215c0d3b0656da88f0fd828b
Stored in directory: /root/.cache/pip/wheels/39/b8/cc/049c8f7f02a46a88305db6b9ed26799fded45f98e20728640c
Successfully built flake8-blind-except flake8-debugger
Installing collected packages: click, MarkupSafe, Jinja2, Werkzeug, itsdangerous, Flask, pluggy, toml, more-itertools, attrs, py, iniconfig, six, pyparsing, packaging, pytest, appdirs, regex, pathspec, typed-ast, black, pyflakes, mccabe, pycodestyle, flake8, flake8-blind-except, flake8-debugger, snowballstemmer, pydocstyle, flake8-docstrings, isort, testfixtures, flake8-isort, flake8-polyfill, pep8-naming
Successfully installed Flask-1.1.2 Jinja2-2.11.2 MarkupSafe-1.1.1 Werkzeug-1.0.1 appdirs-1.4.4 attrs-20.2.0 black-19.10b0 click-7.1.2 flake8-3.8.3 flake8-blind-except-0.1.1 flake8-debugger-3.2.1 flake8-docstrings-1.5.0 flake8-isort-4.0.0 flake8-polyfill-1.0.2 iniconfig-1.0.1 isort-5.5.2 itsdangerous-1.1.0 mccabe-0.6.1 more-itertools-8.5.0 packaging-20.4 pathspec-0.8.0 pep8-naming-0.11.1 pluggy-0.13.1 py-1.9.0 pycodestyle-2.6.0 pydocstyle-5.1.1 pyflakes-2.2.0 pyparsing-2.4.7 pytest-6.0.2 regex-2020.9.27 six-1.15.0 snowballstemmer-2.0.0 testfixtures-6.14.2 toml-0.10.1 typed-ast-1.4.1
Removing intermediate container f4743afd3a31
---> c63db68e69d5
Step 15/15 : CMD ["flask", "run"]
---> Running in c0f90d383fb2
Removing intermediate container c0f90d383fb2
---> 8552c5d064ca
Successfully built 8552c5d064ca
Successfully tagged site-development:latest
Recreating mysite_flask-dev_1 ...
stephen@stephen:~/Projects/mysite$ docker-compose ps
docker-compose ps
Name Command State Ports
---------------------------------------------------------------
mysite_flask-dev_1 flask run Up 0.0.0.0:5000->5000/tcp
stephen@stephen:~/Projects/mysite$ docker-compose logs
docker-compose logs
Attaching to mysite_flask-dev_1
flask-dev_1 | * Tip: There are .env or .flaskenv files present. Do "pip install python-dotenv" to use them.
flask-dev_1 | * Serving Flask app "mysite" (lazy loading)
flask-dev_1 | * Environment: development
flask-dev_1 | * Debug mode: on
flask-dev_1 | * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
flask-dev_1 | * Restarting with stat
flask-dev_1 | * Tip: There are .env or .flaskenv files present. Do "pip install python-dotenv" to use them.
flask-dev_1 | * Debugger is active!
flask-dev_1 | * Debugger PIN: 124-299-806
答案 0 :(得分：0)
每docker quickstart guide，您需要在Dockerfile中设置ENV FLASK_RUN_HOST=0.0.0.0。
将@robert的有用评论移至答案
“因此需要特别要求Flask监听0.0.0.0，因为然后它监听每个网络接口，而不仅是环回（请参阅：stackoverflow.com/questions/20778771/…），因此，将其绑定到127.0.0.1可以在裸机上工作，但不能在VM或docker容器中工作。但是，您尝试进行的端口映射更改是，我相信将端口5000映射到主机的0.0.0.0，并且根本不影响容器。” / p>