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## Compose sample application
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### Python/Flask with Nginx proxy and MySQL database
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Project structure:
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```
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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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[_docker-compose.yaml_](docker-compose.yaml)
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```
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services:
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backend:
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build: backend
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...
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db:
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# We use a mariadb image which supports both amd64 & arm64 architecture
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image: mariadb:10.6.4-focal
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# If you really want to use MySQL, uncomment the following line
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#image: mysql:8.0.27
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...
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proxy:
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build: proxy
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...
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|
```
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The compose file defines an application with three services `proxy`, `backend` and `db`.
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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.
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Make sure port 80 on the host is not already being in use.
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|
|
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|
> ℹ️ **_INFO_**
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> For compatibility purpose between `AMD64` and `ARM64` architecture, we use a MariaDB as database instead of MySQL.
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|
|
> You still can use the MySQL image by uncommenting the following line in the Compose file
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|
|
> `#image: mysql:8.0.27`
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|
|
|
|
|
## Deploy with docker-compose
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|
|
|
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|
```
|
|
|
$ docker-compose up -d
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|
|
Creating network "nginx-flask-mysql_default" with the default driver
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|
|
Pulling db (mysql:8.0.19)...
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|
|
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`.
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|
Creating nginx-flask-mysql_db_1 ... done
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|
|
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
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|
|
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
|
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|
|
|
|
|
|
|
```
|
|
|
|
|
|
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
|
|
|
```
|