Docker Compose (Local Testing)

Developers define all their necessary services in a single 'docker-compose.yml' file, which specifies the environment configurations and dependencies. To spin up the entire local environment, you simply run the 'docker-compose up' command in the terminal.

Using the 'restart: always' policy ensures that if a container crashes or stops unexpectedly, Docker will automatically restart it. This is incredibly useful for local development testing because it guarantees that your required background dependencies remain online.

On modern versions of Docker Desktop for Windows and macOS, Docker Compose is included as part of the standard installation. For Linux users, it is now commonly integrated into the Docker CLI as a plugin, meaning you can use the 'docker compose' command natively.

By defining all services in a single, version-controlled file, developers can ensure their local environment perfectly mimics the required dependencies. This eliminates the 'it works on my machine' problem by running your local code against the exact database or cache configurations used in production.