Environment variables in Compose

Environment variables and interpolation in Docker Compose help you create reusable, flexible configurations. This makes Dockerized applications easier to manage and deploy across environments.

Tip

Before using environment variables, read through all of the information first to get a full picture of environment variables in Docker Compose.

This section covers:

• How to set environment variables within your container's environment.
• How environment variable precedence works within your container's environment.
• Pre-defined environment variables.

It also covers:

• How interpolation can be used to set variables within your Compose file and how it relates to a container's environment.
• Some best practices.