Python Flask + Redis 练习

程序准备

from flask import Flask
from redis import Redis
import os
import socket
app = Flask(__name__)
redis = Redis(host=os.environ.get('REDIS_HOST', '127.0.0.1'), port=6379)
@app.route('/')
def hello():
    redis.incr('hits')
    return f"Hello Container World! I have been seen {redis.get('hits').decode('utf-8')} times and my hostname is {socket.gethostname()}.\n"

FROM python:3.9.5-slim
RUN pip install flask redis && \
groupadd -r flask && useradd -r -g flask flask && \
mkdir /src && \
chown -R flask:flask /src
USER flask
COPY app.py /src/app.py
WORKDIR /src
ENV FLASK_APP=app.py REDIS_HOST=redis
EXPOSE 5000
CMD ["flask", "run", "-h", "0.0.0.0"]

镜像准备

docker image pull redis
docker image build -t flask-demo .
docker image ls

创建一个docker bridge

docker network create -d bridge demo-network
docker network ls

创建redis container

docker container run -d --name redis-server --network demo-network redis
docker container ls

创建flask container

docker container run -d --network demo-network --name flask-demo --env REDIS_HOST=redis-server -p 5000:5000 flask-demo

总结

# prepare image
docker image pull redis
docker image build -t flask-demo .
# create network
docker network create -d bridge demo-network
# create container
docker container run -d --name redis-server --network demo-network redis
docker container run -d --network demo-network --name flask-demo --env REDIS_HOST=redis-server -p 5000:5000 flask-demo