运行docker容器时出错：启动容器进程导致“exec：”python “：$ PATH中找不到可执行文件”：未知

Question

我试图将一个简单的Python-Flask应用程序停靠，但是在运行我的容器时遇到错误。

docker：来自守护进程的错误响应：OCI运行时创建失败：container_linux.go：344：启动容器进程导致“exec：”python “：$ PATH中找不到可执行文件”：未知。

localhost上的Workdir：

/home/ubuntu/flask_web
- app.py
- Dockerfile
- requirements.txt

app.朋友

#flask_web/app.py

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hey, we have Flask in a Docker container'


if __name__ == '__main__':
    app.run(debug=True, host='0.0.0.0')

Dockerfile

FROM ubuntu:16.04

MAINTAINER xyz "xyz@gmail.com"

RUN apt-get update 
    && apt-get install -y software-properties-common vim 
    && add-apt-repository ppa:jonathonf/python-3.6 
    && apt-get update -y 
    && apt-get install -y build-essential python3.6 python3.6-dev python3-pip python3.6-venv 
    && pip3 install --upgrade pip

# We copy just the requirements.txt first to leverage Docker cache
COPY ./requirements.txt /app/requirements.txt

WORKDIR /app

RUN pip install -r requirements.txt

COPY . /app

ENTRYPOINT [ "python" ]

CMD [ "app.py" ]

命令：

docker build -t flask-test:latest .
docker run -p 5000:5000 flask-test

预计：Flask web应该在端口5000上运行

实际结果：

docker: Error response from daemon: OCI runtime create failed: container_linux.go:344: starting container process caused "exec: "python": executable file not found in $PATH": unknown.