docker部署flask服务示例
首先推荐阅读Flask 官方文档欢迎来到 Flask 的世界快速了解Flask架构
快速搭建一个flask服务
一个最小的应用
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello():
return "Hello World!"
if __name__ == '__main__':
app.run(host='0.0.0.0')
运行demo
$ export FLASK_APP=app.py
$ flask run
* Running on http://127.0.0.1:5000/或者python -m flask
$ export FLASK_APP=app.py
$ python -m flask run
* Running on http://127.0.0.1:5000/或者
✗ python3 app.py
* Serving Flask app "app" (lazy loading)
* Environment: production
WARNING: This is a development server. Do not use it in a production deployment.
Use a production WSGI server instead.
* Debug mode: off
* Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)外部可见的服务器
flask run --host=0.0.0.0 # 可以让服务器被公开访问调试模式
# 如果需要打开所有开发功能（包括调试模式），那么要在运行服务器之前导出 FLASK_ENV 环境变量并把其设置为 development
$ export FLASK_ENV=development
$ flask run项目文件
.
├── README.md
├── app
│ ├── Dockerfile
│ ├── app.py
│ └── requirements.txt
└── docker-compose.yamldocker 部署服务
✗ cd flask-demo/app
✗ docker build -t="flask-demo:v1" .
[+] Building 26.3s (11/11) FINISHED
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 296B 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 2B 0.0s
=> [internal] load metadata for docker.io/library/python:3.7-alpine 26.1s
=> [auth] library/python:pull token for registry-1.docker.io 0.0s
=> [internal] load build context 0.0s
=> => transferring context: 697B 0.0s
=> [1/5] FROM docker.io/library/python:3.7-alpine@sha256:39ad96c8188f69d513ded616433396a9ab90e061ca85d8eacf6514fa27ec3d40 0.0s
=> => resolve docker.io/library/python:3.7-alpine@sha256:39ad96c8188f69d513ded616433396a9ab90e061ca85d8eacf6514fa27ec3d40 0.0s
=> CACHED [2/5] WORKDIR /app 0.0s
=> CACHED [3/5] COPY requirements.txt /app 0.0s
=> CACHED [4/5] RUN pip3 install -r requirements.txt --no-cache-dir 0.0s
=> [5/5] COPY . /app 0.1s
=> exporting to image 0.0s
=> => exporting layers 0.0s
=> => writing image sha256:9fc116d3008819bf171b4cb2a10957e842b77aa24bde2582d737040cd6f9eaec 0.0s
=> => naming to docker.io/library/flask-demo:v1
✗ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
flask-demo v1 9fc116d30088 3 minutes ago 51.6MB启动容器
-p指定端口映射，格式为：主机(宿主)端口:容器端口-d: 后台运行容器，并返回容器ID；-i: 以交互模式运行容器，通常与 -t 同时使用；-P: 随机端口映射，容器内部端口随机映射到主机的端口-p: 指定端口映射，格式为：主机(宿主)端口:容器端口-t: 为容器重新分配一个伪输入终端，通常与 -i 同时使用；✗ docker run -d -p 5000:5000 flask-demo:v1 * Serving Flask app "app" (lazy loading) * Environment: production WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead. * Debug mode: off * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
打开浏览器输入localhost:5000
关闭容器
✗ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
8c87f5f494b8 flask-demo:v1 "python3 app.py" About a minute ago Up 10 seconds 0.0.0.0:5000->5000/tcp nervous_bassi
(venv) ➜ app git:(main) ✗ docker stop 8c87f5f494b8
8c87f5f494b8
(venv) ➜ app git:(main) ✗ docker start 8c87f5f494b8
8c87f5f494b8docker-compose 部署服务
Docker Compose 是 Docker 官方编排（Orchestration）项目之一，负责快速在集群中部署分布式应用。
✗ docker-compose up
Building web
[+] Building 16.4s (11/11) FINISHED
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 120B 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 2B 0.0s
=> [internal] load metadata for docker.io/library/python:3.7-alpine 16.3s
=> [auth] library/python:pull token for registry-1.docker.io 0.0s
=> [internal] load build context 0.0s
=> => transferring context: 505B 0.0s
=> [1/5] FROM docker.io/library/python:3.7-alpine@sha256:39ad96c8188f69d513ded616433396a9ab90e061ca85d8eacf6514fa27ec3d40 0.0s
=> => resolve docker.io/library/python:3.7-alpine@sha256:39ad96c8188f69d513ded616433396a9ab90e061ca85d8eacf6514fa27ec3d40 0.0s
=> CACHED [2/5] WORKDIR /app 0.0s
=> CACHED [3/5] COPY requirements.txt /app 0.0s
=> CACHED [4/5] RUN pip3 install -r requirements.txt --no-cache-dir 0.0s
=> CACHED [5/5] COPY . /app 0.0s
=> exporting to image 0.0s
=> => exporting layers 0.0s
=> => writing image sha256:9fc116d3008819bf171b4cb2a10957e842b77aa24bde2582d737040cd6f9eaec 0.0s
=> => naming to docker.io/library/flask-demo_web 0.0s
Successfully built 9fc116d3008819bf171b4cb2a10957e842b77aa24bde2582d737040cd6f9eaec
WARNING: Image for service web was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
Creating flask-demo_web_1 ... done
Attaching to flask-demo_web_1
web_1 | * Serving Flask app "app" (lazy loading)
web_1 | * Environment: production
web_1 | WARNING: This is a development server. Do not use it in a production deployment.
web_1 | Use a production WSGI server instead.
web_1 | * Debug mode: off
web_1 | * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
^CGracefully stopping... (press Ctrl+C again to force)
Stopping flask-demo_web_1 ... done
(venv) ➜ flask-demo git:(main) ✗ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2e48108b8e1d flask-demo_web "python3 app.py" 6 minutes ago Exited (137) 9 seconds ago flask-demo_web_1ctrl+c终止服务,使用docker ps -a查看所有容器，再次启动容器使用docker start 容器id
✗ docker start 2e48108b8e1d
2e48108b8e1d
(venv) ➜ flask-demo git:(main) ✗ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2e48108b8e1d flask-demo_web "python3 app.py" 9 minutes ago Up 16 seconds 0.0.0.0:5000->5000/tcp flask-demo_web_1up参数
- 构建，（重新）创建，启动，链接一个服务相关的容器。
- 链接的服务都将会启动，除非他们已经运行。
- 默认情况，
docker-compose up将会整合所有容器的输出，并且退出时，所有容器将会停止。 - 如果使用
docker-compose up -d，将会在后台启动并运行所有的容器。 - 默认情况，如果该服务的容器已经存在，
docker-compose up将会停止并尝试重新创建他们（保持使用volumes-from挂载的卷），以保证docker-compose.yml的修改生效。如果你不想容器被停止并重新创建，可以使用docker-compose up --no-recreate。如果需要的话，这样将会启动已经停止的容器。
