Docker Workshop

Docker Compose

Prerequisites

1. Clone this repository git clone https://github.com/bossan/docker-workshop
2. Go to the folder docker-workshop/examples/docker_compose.

The docker-compose file

Look at the docker-compose.yml file.

It contains the following information:

version

The version of the docker-compose file format we want to use. There are different versions so it is wise to specify which version you want to use in case there is an update.

services

The services (containers) we want to run. In this case it is:

• mongodb: the database using an existing image
• web: our web app that we created with our own Dockerfile

volumes

Volumes are a place to store data. We use it to store the data from our database. This way we can keep the data even if the container with the database is deleted or upgraded.

Start the environment

Run the following command to start the services:

docker compose up -d

• compose because we want to use a docker-compose file
• up to start the services
• -d to run it in ‘detached’ mode (runs in the background)

Check running containers

Run the following command to see which containers are currently running:

docker ps

Open the app

Go to http://localhost:3000 to use the app. You can use the Swagger UI to interact with the API.

Using play-with-docker? Instead of opening localhost:3000 you should click on the “OPEN PORT” button and fill in 3000. This should open a new page with the application.

Stop the running containers

You can stop and REMOVE all containers with:

docker compose down

Or you can just stop them (without removing) using:

docker compose stop