Running an application with Docker Compose
Once we have built our images, we can start the application using Docker Compose:
$ docker compose up
The output, similar to the output we discussed in the previous section for the db and pgadmin services, will look as follows for the web service:
step2-web-1 | DB_HOST: dbstep2-web-1 | Application listening on port 3000
This indicates that the containerized web service is ready and is listening on port 3000. Coincidentally, we have mapped container port 3000 to the same port 3000 on the host in our docker-compose.yml file. Thus, we can just open a new browser tab and navigate to the URL http://localhost:3000/animal; we should once again see a wild animal displayed.
Refresh the browser a few times to see other animal images. The application selects the current image randomly from a set of 12 images whose URLs are stored in the database.
As the application...
