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## Compose sample application
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### Python/Flask application with Nginx proxy and a Mongo database
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Project structure:
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```
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.
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├── 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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[_compose.yaml_](compose.yaml)
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```
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services:
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web:
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build: app
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ports:
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- 80:80
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backend:
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build: flask
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...
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mongo:
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image: mongo
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```
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The compose file defines an application with three services `web`, `backend` and `db`.
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When deploying the application, docker compose maps port 80 of the web 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 being used by another container, otherwise the port should be changed.
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## Deploy with docker compose
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|
|
|
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|
```
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$ docker compose up -d
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|
|
Creating network "nginx-flask-mongo_default" with the default driver
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|
|
Pulling mongo (mongo:)...
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|
|
latest: Pulling from library/mongo
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|
|
423ae2b273f4: Pull complete
|
|
|
...
|
|
|
...
|
|
|
Status: Downloaded newer image for nginx:latest
|
|
|
Creating nginx-flask-mongo_mongo_1 ... done
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|
|
Creating nginx-flask-mongo_backend_1 ... done
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|
|
Creating nginx-flask-mongo_web_1 ... done
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|
|
|
|
|
```
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|
|
|
|
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## Expected result
|
|
|
|
|
|
Listing containers must show three containers running and the port mapping as below:
|
|
|
```
|
|
|
$ docker ps
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|
|
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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|
|
a0f4ebe686ff nginx "/bin/bash -c 'envsu…" About a minute ago Up About a minute 0.0.0.0:80->80/tcp nginx-flask-mongo_web_1
|
|
|
dba87a080821 nginx-flask-mongo_backend "./server.py" About a minute ago Up About a minute nginx-flask-mongo_backend_1
|
|
|
d7eea5481c77 mongo "docker-entrypoint.s…" About a minute ago Up About a minute 27017/tcp nginx-flask-mongo_mongo_1
|
|
|
```
|
|
|
|
|
|
After the application starts, navigate to `http://localhost:80` in your web browser or run:
|
|
|
```
|
|
|
$ curl localhost:80
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|
|
Hello from the MongoDB client!
|
|
|
```
|
|
|
|
|
|
Stop and remove the containers
|
|
|
```
|
|
|
$ docker compose down
|
|
|
```
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