第一次构建、运行、发布、获取docker镜像的步骤详解

# Use an official Python runtime as a parent image
FROM python:2.7-slim
# Set the working directory to /app
WORKDIR /app
# Copy the current directory contents into the container at /app
ADD . /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"]

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)

docker build -t friendlyhello

docker run -p 4000:80 friendlyhello

$ curl http://localhost:4000
<h3>Hello World!</h3><b>Hostname:</b> 8fc990912a14<br/><b>Visits:</b> <i>cannot connect to Redis, counter disabled</i>

docker run -d -p 4000:80 friendlyhello

docker container stop 1fa4ab2cf395

sudo docker login --username=admin registry.cn-hangzhou.aliyuncs.com

docker tag image_name registry_url/namespace/repository_name:[tag]

docker tag friendlyhello registry.cn-hangzhou.aliyuncs.com/shuzhou/demo1:latest

docker image ls

docker push registry.cn-hangzhou.aliyuncs.com/shuzhou/demo1:latest

docker run -p 4000:80 registry.cn-hangzhou.aliyuncs.com/shuzhou/demo1:latest

docker pull registry.cn-hangzhou.aliyuncs.com/shuzhou/demo1:latest