创建空白的dockerfile:
- 创建一个名为的文件Dockerfile，将以下内容复制并粘贴到该文件中，然后保存。
# 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
COPY . /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"]
- 将app.py和requirements.txt发在dockerfile的同一级目录下
requirements.txt内容如下：
Flask
Redis
app.py内容如下：
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)
$ ls
Dockerfile app.py requirements.txt
现在运行build命令。创建一个Docker镜像(后面有个点)
docker build -t friendlyhello .
$ docker image ls
REPOSITORY TAG IMAGE ID
friendlyhello latest 326387cea398
