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搭建 Docker + Flask 后端

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搭建 Docker + Flask 后端

使用 Docker + Flask + Gunicorn + Gevent + nginx 来搭建纯 API 后端

目标

使用 Docker 编排管理服务, 使用 Shell 脚本一键化部署流程

第一步

创建目录/文件, 结构如下:

site
|– flask
    |– Dockerfile
    |– server
        |– config
            |– gunicorn.conf.py
        |– app.py
        |– requirements.txt
|– nginx
    |– default.conf
|– docker-compose.yml
|– deploy.sh

第二步

flask/Dockerfile

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FROM python:3.7

COPY ./server /workspace
WORKDIR /workspace

RUN pip install -i https://mirrors.aliyun.com/pypi/simple/ --upgrade pip \
	&& pip --no-cache-dir install -i https://mirrors.aliyun.com/pypi/simple/ -r requirements.txt

EXPOSE 5000

CMD ["gunicorn", "app:app", "-c", "./config/gunicorn.conf.py"]

flask/server/requirements.txt

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Flask==1.0.2
gunicorn==19.9.0
gevent==1.4.0

flask/server/app.py

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from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

flask/server/config/gunicorn.conf.py

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workers = 5
worker_class = "gevent"
bind = "0.0.0.0:5000"
loglevel = 'debug'

nginx/default.conf

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server {
    listen 80;
    server_name api.site.com;
    listen [::]:80;
    server_tokens off;
    client_max_body_size 15M;

    access_log  /var/log/nginx/nginx.api.access.log;
    error_log   /var/log/nginx/nginx.api.error.log;

    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_set_header X-NginX-Proxy true;

        proxy_pass http://flask:5000;
        proxy_redirect off;
    }
}

docker-compose.yml

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version: "3"
services:
  nginx:
    image: nginx:alpine
    volumes:
      - ./nginx:/etc/nginx/conf.d
      - /var/log/nginx:/var/log/nginx
    links:
      - flask
    ports:
      - 80:80
  flask:
    build:
      context: ./flask

deploy.sh

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#!/bin/bash

rm -rf 'tmp.tar'
cd '..'
tar cf 'tmp.tar' 'site'
mv 'tmp.tar' 'site/tmp.tar'
cd 'site'

sftp 'root@api.norld.com' <<EOF
cd '/root'
put 'tmp.tar'
exit
EOF

rm -rf 'tmp.tar'

ssh 'user@api.site.com' <<EOF
rm -rf 'site'
tar xf 'tmp.tar'
cd 'site'
docker-compose down
docker-compose up --build -d
echo 'y' | docker image prune
exit
EOF

第三步

将部分参数替换成你需要的, 终端执行 deploy.sh, 开始访问 http://api.site.com, Hello, World!