Docker Compose

Question 1

What is Docker Compose?

Answer 1

Docker Compose is a tool for orchestrating containers locally. It should not be used for production.

Question 2

What is a compose.yaml file?

Answer 2

A compose.yaml file is a set of instructions for building and executing container services

Question 3

By default Compose sets up a single network for your app. Each container for a service joins the default network and is both reachable by other containers on that network, and discoverable by the service’s name.

Question 4

Docker compose supports variables in the compose file, allowing you to customize your composition for different environments

Question 5

Which has the highest precedence when defining environment variables: compose.yaml or Dockerfile?

Answer 5

compose.yaml has the highest precedence. This means, configuration specified in compose.yaml will override configuration in Dockerfile. For more details, review: https://docs.docker.com/compose/environment-variables/envvars-precedence/

Question 6

The compose.yaml file adds the service names as hostname aliases