构建镜像

vim app.py

from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello_world():
    return 'Hello World!'
if __name__ == '__main__':
    app.run(host='0.0.0.0',port=8080)

cat app.py 
touch Dockerfile
ls
vim Dockerfile

FROM centos:7.8.2003
RUN curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo;
RUN curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo;
RUN yum makecache fast;
RUN yum install python3-devel python3-pip -y
RUN pip3 install -i https://pypi.douban.com/simple flask
COPY app.py /opt
WORKDIR /opt
EXPOSE 8080
CMD ["python3","app.py"]

运行镜像

docker build -t "python_flask_web" .
#docker build --no-cache -t "python_flask_web" .
#不采用缓存依赖
docker run -d --name web -p 90:8080 python_flask_web