Docker官方案例学习

下面以官方的一个demo学习学习。。。

1、进入windows版docker界面，新建文件夹pp

2、进入pp，在目录下新建三个文件

dockerfile.txt，app.py，requirements.txt

2.1 dockerfile文件

# Use an official Python runtime as a parent image
FROM python:3.8

# Set the working directory to /app
WORKDIR /usr/src/python-app

# Copy the current directory contents into the container at /app
COPY . /usr/src/python-app

# Install any needed packages specified in requirements.txt
RUN pip install --trusted-host pypi.python.org -r requirements.txt

# Make port 80 available to the world outside this container
EXPOSE 80

# Define environment variable
ENV NAME World

# Run app.py when the container launches
CMD ["python", "app.py"]

2.2 requirements.txt

Flask
Redis

2.3 app.py

from flask import Flask
from redis import Redis, RedisError
import os
import socket
 
# Connect to Redis
redis = Redis(host="redis", db=0, socket_connect_timeout=2, socket_timeout=2)
 
app = Flask(__name__)
 
@app.route("/")
def hello():
    try:
        visits = redis.incr("counter")
    except RedisError:
        visits = "<i>cannot connect to Redis, counter disabled</i>"
 
    html = "<h3>Hello {name}!</h3>" \
           "<b>Hostname:</b> {hostname}<br/>" \
           "<b>Visits:</b> {visits}"
    return html.format(name=os.getenv("NAME", "world"), hostname=socket.gethostname(), visits=visits)
 
if __name__ == "__main__":
    app.run(host='0.0.0.0', port=80)

3、在文件夹pp下进行docker构建，注意.不可忽略

docker build -t pyapp:v1.0.1 -f ./dockerfile.txt .

4、查看镜像

docker image ls

5、运行镜像

docker run -p 4000:80 pyapp:v1.0

6、访问http://192.168.99.100:4000/，具体IP地址似绑定的为准