Docker Compose for local development in Microservices - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Docker Compose and why is it useful for local development?

Docker Compose is a tool that lets you define and run multiple containers as a single service using a simple file. It helps developers start all parts of their app with one command, making local development easier and faster.

beginner

What file format does Docker Compose use to define services?

Docker Compose uses a YAML file, usually named docker-compose.yml, to describe the services, networks, and volumes needed for the application.

intermediate

How does Docker Compose help manage dependencies between microservices during local development?

Docker Compose allows you to specify service dependencies so containers start in the right order. It also creates a shared network so services can easily communicate by name.

intermediate

What is the purpose of volumes in Docker Compose for local development?

Volumes let you share files between your computer and containers. This means you can edit code on your machine and see changes immediately inside the container without rebuilding.

intermediate

Name one best practice when using Docker Compose for local development.

One best practice is to keep the docker-compose.yml simple and use environment variables for configuration. This makes it easier to switch between local and production setups.

What command starts all services defined in a Docker Compose file?

A docker run

B docker-compose up

C docker build

D docker start

The command docker-compose up starts all services defined in the Compose file together.

Which file extension is used for Docker Compose configuration?

A .json

B .xml

C .yml or .yaml

D .txt

Docker Compose uses YAML files with extensions .yml or .yaml.

How does Docker Compose allow services to communicate with each other?

A By creating a shared network where services can use service names

B By exposing ports to the internet

C By copying files between containers

D By using environment variables only

Docker Compose creates a shared network so services can reach each other by their service names.

What is the benefit of using volumes in Docker Compose during development?

A To increase container CPU usage

B To secure containers from outside access

C To speed up container startup time

D To share code changes instantly between host and container

Volumes let you share files so code changes on your computer appear immediately inside the container.

Which of these is a recommended practice for Docker Compose files?

A Use environment variables for flexible configuration

B Avoid using networks

C Run all services as root user

D Hardcode all configuration values inside the file

Using environment variables makes configuration flexible and easier to change between environments.

Explain how Docker Compose simplifies running multiple microservices locally.

Think about how you would start many apps on your computer with one click.

Describe the role of volumes and networks in Docker Compose for local development.

Consider how your apps share data and connect on your computer.