Docker Compose allows users to define and run multi-container Docker applications. With Docker Compose, a YAML file is used to configure an application's services, and with a single command, all the services can be started from the configuration. Docker Compose is a three step process - services are defined in a Dockerfile, then in a Docker Compose file, and then run with docker-compose up. It supports volumes, networks, and environmental variables. Docker Compose can be used for development, testing, and production environments across different platforms.

1. Introduction to Docker Compose

2. Agenda
- What is Docker Compose?
- 3 Steps of Docker Compose
- Building Blocks of Docker Compose
- Docker Compose File Format
- Networking in Docker Compose
- Environmental Variable under Docker Compose
- Installing Docker Compose
- Examples – WordPress, HelloWhale etc.
- Hands-on Labs

3. Introduction

4. Compose works in all
environments: production,
staging, development,
testing, as well as CI
workflows.
A tool for defining and
running multi-
container Docker
applications
With Compose, you
use a YAML file to
configure your
application’s services.
With a single command,
you create and start all
the services from your
configuration
What is Docker Compose?

5. 3 step process of Docker Compose

6. Docker Compose is a 3 Steps Process
Define your app’s
environment with a
Dockerfile
Define the services that
make up your app in
Docker Compose file
Run the CLI:
$ docker-compose up

7. Building Blocks of Docker Compose

8. Building Blocks of Docker Compose
B
A
C
Services Volumes Networking

9. A Sample Docker Compose File

10. Docker Compose Compatibility
Matrix

11. Docker
Compose
File Format
Compatibility
Matrix

12. Environmental Variable in
Docker Compose

13. Environmental Variable
in Docker Compose:
Using .env file

14. Environmental Variable
in Docker Compose:
Using `docker-compose
run` command

15. Networking in Compose

16. Networking in Compose
- A network called myapp_default is created.
- A container is created using web’s configuration.
It joins the network myapp_default under the
name web.
- A container is created using db’s configuration. It
joins the network myapp_default under the
name db.

17. Compose for Swarm
Mode
- The same Compose file can be used to deploy
containerized apps on multi-host system
- The overlay driver creates a named network
across multiple nodes in a swarm.
- The “global mode” enable atleast one copy of
apps running on every node of the swarm

18. How to install Docker Compose?

19. How to Install Docker Compose
$ curl -L https://github.com/docker/compose/releases/download/1.25.0/docker-compose-
`uname -s`-`uname -m` -o /usr/local/bin/docker-compose
$ chmod +x /usr/local/bin/docker-compose
Note: Docker Desktop will automatically install the latest version of Docker
Engine for you.

20. A Sample WordPress Compose File

22. Labs

23. Playground:
https://play-with-docker.com
https://dockerlabs.collabnix.com/intermediate/workshop
Labs:

24. Docker Compose Labs

25. https://github.com/docker/compose/

26. Thank You!