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## Compose sample application
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### Python/Flask with Nginx proxy and MySQL database
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|
|
|
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Project structure:
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|
```
|
|
|
.
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|
├── docker-compose.yaml
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|
├── flask
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|
│ ├── Dockerfile
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|
│ ├── requirements.txt
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|
│ └── server.py
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└── nginx
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|
└── nginx.conf
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|
|
|
|
|
```
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|
|
|
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|
[_docker-compose.yaml_](docker-compose.yaml)
|
|
|
```
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|
|
services:
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|
|
backend:
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|
|
build: backend
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|
|
...
|
|
|
db:
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|
|
image: mysql:8.0.19
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|
|
...
|
|
|
proxy:
|
|
|
build: proxy
|
|
|
...
|
|
|
```
|
|
|
The compose file defines an application with three services `proxy`, `backend` and `db`.
|
|
|
When deploying the application, docker-compose maps port 80 of the proxy service container to port 80 of the host as specified in the file.
|
|
|
Make sure port 80 on the host is not already being in use.
|
|
|
|
|
|
## Deploy with docker-compose
|
|
|
|
|
|
```
|
|
|
$ docker-compose up -d
|
|
|
Creating network "nginx-flask-mysql_default" with the default driver
|
|
|
Pulling db (mysql:8.0.19)...
|
|
|
5.7: Pulling from library/mysql
|
|
|
...
|
|
|
...
|
|
|
WARNING: Image for service proxy was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
|
|
|
Creating nginx-flask-mysql_db_1 ... done
|
|
|
Creating nginx-flask-mysql_backend_1 ... done
|
|
|
Creating nginx-flask-mysql_proxy_1 ... done
|
|
|
```
|
|
|
|
|
|
## Expected result
|
|
|
|
|
|
Listing containers must show three containers running and the port mapping as below:
|
|
|
```
|
|
|
$ docker ps
|
|
|
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
|
|
|
c2c703b66b19 nginx-flask-mysql_proxy "nginx -g 'daemon of…" 39 seconds ago Up 38 seconds 0.0.0.0:80->80/tcp nginx-flask-mysql_proxy_1
|
|
|
2b8a21508c3c nginx-flask-mysql_backend "/bin/sh -c 'flask r…" 9 minutes ago Up 38 seconds 0.0.0.0:5000->5000/tcp nginx-flask-mysql_backend_1
|
|
|
0e6a96ea2028 mysql:8.0.19 "docker-entrypoint.s…" 9 minutes ago Up 38 seconds 3306/tcp, 33060/tcp nginx-flask-mysql_db_1
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
After the application starts, navigate to `http://localhost:80` in your web browser or run:
|
|
|
```
|
|
|
$ curl localhost:80
|
|
|
<div>Blog post #1</div><div>Blog post #2</div><div>Blog post #3</div><div>Blog post #4</div>
|
|
|
```
|
|
|
|
|
|
Stop and remove the containers
|
|
|
```
|
|
|
$ docker-compose down
|
|
|
```
|