“ OSError:[Errno 8]执行格式错误”尝试在Docker容器中运行简单的Flask应用程序时 [英] "OSError: [Errno 8] Exec format error" when trying to run simple flask app in a docker container
问题描述
我正在尝试在Docker容器中启动一个简单的Flask Hello world应用程序,但我不断收到此错误: OSError:[Errno 8] Exec格式错误:'/ app / app.py'
我的主机操作系统是Windows 10。
我的Dockerfile:
从python:3.6
ENV PYTHONBUFFERED 1
添加。 / app
WORKDIR / app
RUN pip install -r requirements.txt
我有Requirements.txt,其中Flask == 1.0.2。
app.py:
$ b从烧瓶导入烧瓶中获取的$ b
Flask
app = Flask(__ name__)
@ app.route( /)
def hello():
返回 Hello World!
如果__name__ =='__main__':
app.run(host ='0.0.0.0',port = 8000,debug = True)
和docker-compose.yml:
版本: 3
服务:
应用程序:
构建:。
命令:python app.py
端口:
- 8000:8000
容器的整个日志:
app_1 | *正在投放Flask应用 app(延迟加载)
app_1 | *环境:生产
app_1 |警告:不要在生产环境中使用开发服务器。
app_1 |请改用生产WSGI服务器。
app_1 | *调试模式:在
app_1 | *在http://0.0.0.0:8000/上运行(按CTRL + C退出)
app_1 | *重新启动stat
app_1 |追溯(最近一次通话):
app_1 | < module>中的文件 app.py,第9行
app_1 | app.run(host ='0.0.0.0',port = 8000,debug = True)
app_1 |在运行
app_1中,文件 /usr/local/lib/python3.6/site-packages/flask/app.py第943行| run_simple(主机,端口,自我,**选项)
app_1 |在run_simple
app_1中的文件 /usr/local/lib/python3.6/site-packages/werkzeug/serving.py,行988。 run_with_reloader(内部,额外文件,reloader_interval,reloader_type)
app_1 |在run_with_reloader
app_1中的文件 /usr/local/lib/python3.6/site-packages/werkzeug/_reloader.py,第332行。 sys.exit(reloader.restart_with_reloader())
app_1 |文件 /usr/local/lib/python3.6/site-packages/werkzeug/_reloader.py,行176,位于restart_with_reloader
app_1 | exit_code = subprocess.call(args,env = new_environ,close_fds = False)
app_1 |调用
app_1 |中的文件 /usr/local/lib/python3.6/subprocess.py,第287行。使用Popen(* popenargs,** kwargs)as p:
app_1 | __init__
app_1中的文件 /usr/local/lib/python3.6/subprocess.py,第729行。 restore_signals,start_new_session)
app_1 | _execute_child
app_1中的文件 /usr/local/lib/python3.6/subprocess.py,行1364。引发child_exception_type(errno_num,err_msg,err_filename)
app_1 | OSError:[Errno 8]执行格式错误:'/app/app.py'
flaskdockerproject_app_1退出,代码为1
UPDATE
在我在app.py中添加了shebang之后,就像@larsks说的那样,我得到了这个错误:
FileNotFoundError:[ Errno 2]没有这样的文件或目录:'/app/app.py':'/app/app.py'。
所有文件都在容器中,在正确的位置。
我遇到了同样的问题(Exec格式错误,如果添加了shebang,则为FileNotFound)。 / p>
在Dockerfile中添加 RUN chmod 644 app.py已为我修复,如下所述: https://github.com/pallets/werkzeug/issues/1482
I'm trying to start a simple Flask "Hello world" app in a docker container but I keep getting this error: "OSError: [Errno 8] Exec format error: '/app/app.py'"
My host operating system is Windows 10.
My Dockerfile:
FROM python:3.6
ENV PYTHONBUFFERED 1
ADD . /app
WORKDIR /app
RUN pip install -r requirements.txt
I have requirements.txt with Flask==1.0.2.
app.py:
from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
return "Hello World!"
if __name__ == '__main__':
app.run(host='0.0.0.0', port=8000, debug=True)
and docker-compose.yml:
version: '3'
services:
app:
build: .
command: python app.py
ports:
- "8000:8000"
Whole log of container:
app_1 | * Serving Flask app "app" (lazy loading)
app_1 | * Environment: production
app_1 | WARNING: Do not use the development server in a production environment.
app_1 | Use a production WSGI server instead.
app_1 | * Debug mode: on
app_1 | * Running on http://0.0.0.0:8000/ (Press CTRL+C to quit)
app_1 | * Restarting with stat
app_1 | Traceback (most recent call last):
app_1 | File "app.py", line 9, in <module>
app_1 | app.run(host='0.0.0.0', port=8000, debug=True)
app_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 943, in run
app_1 | run_simple(host, port, self, **options)
app_1 | File "/usr/local/lib/python3.6/site-packages/werkzeug/serving.py", line 988, in run_simple
app_1 | run_with_reloader(inner, extra_files, reloader_interval, reloader_type)
app_1 | File "/usr/local/lib/python3.6/site-packages/werkzeug/_reloader.py", line 332, in run_with_reloader
app_1 | sys.exit(reloader.restart_with_reloader())
app_1 | File "/usr/local/lib/python3.6/site-packages/werkzeug/_reloader.py", line 176, in restart_with_reloader
app_1 | exit_code = subprocess.call(args, env=new_environ, close_fds=False)
app_1 | File "/usr/local/lib/python3.6/subprocess.py", line 287, in call
app_1 | with Popen(*popenargs, **kwargs) as p:
app_1 | File "/usr/local/lib/python3.6/subprocess.py", line 729, in __init__
app_1 | restore_signals, start_new_session)
app_1 | File "/usr/local/lib/python3.6/subprocess.py", line 1364, in _execute_child
app_1 | raise child_exception_type(errno_num, err_msg, err_filename)
app_1 | OSError: [Errno 8] Exec format error: '/app/app.py'
flaskdockerproject_app_1 exited with code 1
UPDATE
After I added the shebang in app.py like @larsks said I'm getting this error: "FileNotFoundError: [Errno 2] No such file or directory: '/app/app.py': '/app/app.py'.
All the files are in the container and in the right place.
I hit the same problem (Exec format error, then FileNotFound if I added the shebang).
Adding "RUN chmod 644 app.py" to the Dockerfile fixed it for me, as mentioned here: https://github.com/pallets/werkzeug/issues/1482
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