Skip to main content

Deploy Existing Containers

This tutorial will show you how to deploy an existing container/multi-container application.

This example is rather useful if you already have a Docker container built manually, or through a CI/CD system where the resulting image is available in a public or private repository accessible by Defang. But it is not required in order to follow along to this tutorial.

Step 1 - Make a Docker Compose file

tip

If you are unfamiliar with Docker Compose files, check out the Compose page.

Create a compose.yaml file to define the service(s) in your application.

If you already have a Docker Compose file to define your service(s), you can use it directly and skip this step.

version: '3.9'
services:
web:
image: nginx:latest
ports:
- mode: ingress
target: 3000
app:
build:
context: .
dockerfile: Dockerfile
ports:
- mode: ingress
target: 4000
redis:
image: redis:6.2
restart: unless-stopped
ports:
- mode: host
target: 6379

The example above shows a multi-container application with 3 services, web, app, redis. If you wanted to deploy only one container, say app, then the example would remain the same, except without the web and redis services.

Step 2 - Deploy

Run the following command in the Defang CLI.

defang compose up