Using Docker Compose to run several containers is common, especially for apps made of multiple services. Docker Compose lets you create and run multi-container Docker apps with a YAML file. Here's a simple guide on running multiple containers with Docker Compose:
Step 1: Install Docker Compose
Make sure you have Docker Compose installed. You can download it from the official Docker website: Install Docker Compose
Step 2: Create a Docker Compose YAML File
Make a docker-compose.yml file in your project folder. This file sets up the services, networks, and storage for your app. Here's a basic example with two services (a web app and a database):
version: '3'
services:
web:
image: nginx:latest
ports:
- "80:80"
db:
image: postgres:latest
environment:
POSTGRES_PASSWORD: example_password
ports:
- "5432:5432"
In this example, there are two services: web (running Nginx) and db (running PostgreSQL). The ports section maps the container ports to the host.
Step 3: Run Docker Compose
Open a terminal, navigate to the directory containing your docker-compose.yml file, and run the following command:
docker-compose up
This command downloads the needed images (if they're not already there) and starts the containers listed in the docker-compose.yml file.
Step 4: Access Your Application
Once the containers are running, you can access your application. In this example, you can access Nginx at http://localhost and PostgreSQL at localhost:5432.
Additional Commands:
To run containers in the background, use the
-dflag:docker-compose up -dTo stop and remove the containers:
docker-compose down
These are simple steps, and you can add more settings, dependencies, and services to your docker-compose.yml file based on what your application needs.