Introduction to Docker Compose

Dec 25, 20193 likes19,335 views

This document introduces Docker Compose, which allows defining and running multi-container Docker applications. It discusses that Docker Compose uses a YAML file to configure and run multi-service Docker apps. The 3 steps are to define services in a Dockerfile, define the app configuration in a Compose file, and run the containers with a single command. It also covers topics like networking, environment variables, and installing Docker Compose. Hands-on labs are provided to learn Compose through examples like WordPress.

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

Did you know?
There are 3,00,000 Docker Compose files in
GitHub today

Docker Compose: Multi Container Applications
4
Without Compose
• Build and run one container at a time
• Manually connect containers together
• Must be careful with dependencies and start
up order
With Compose
• Define multi container app in compose.yml file
• Single command to deploy entire app
• Handles container dependencies
• Works with Docker Swarm, Networking,
Volumes, Universal Control Plane

Docker Compose: WordPress Application
5
Without Compose With Compose
$docker run -e MYSQL_ROOT_PASSWORD=<pass> -e
MYSQL_DATABASE=wordpress --name wordpressdb -v
"$PWD/database":/var/lib/mysql -d mysql:latest
$docker run -e WORDPRESS_DB_PASSWORD=<pass> --name
wordpress --link wordpressdb:mysql -p 80:80 -v "$PWD/html":/var/www/html
-d wordpress
services:
db:
image: mysql:5.7
volumes:
- db_data:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD:
MYSQL_DATABASE: wordpress
wordpress:
depends_on:
- db
image: wordpress:latest
ports:
- "80:80"
environment:
WORDPRESS_DB_PASSWORD=<pass>

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?

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

Building Blocks of Docker Compose
B
A
C
Services Volumes Networking

containers:
web:
build: .
command: python app.py
ports:
- "5000:5000"
volumes:
- .:/code
environment:
- PYTHONUNBUFFERED=1
redis:
image: redis:latest
command: redis-server --appendonly yes
Docker Compose: Multi Container Applications

Docker
Compose
File Format
Compatibility
Matrix

Environmental Variable in
Docker Compose

Environmental Variable
in Docker Compose:
Using .env file

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

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.

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

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.

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

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

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IoET Conference is run by IoET Planet which is purely a collaborative platform. IoET Planet is an innovative platform to bring people together for the first time under a single umbrella in order to learn, collaborate and contribute. It is an open community dedicated to IoT Research, innovation and applications. Today it is a blogging site & covers a wide range of topics, from embedded systems to data analytics and machine learning implementation, having the objective of enabling a vast array of services in areas like e-health, mobility, energy, manufacturing and agriculture, just to cite a few examples. These topics are coming from the community users and open for industry experts, IoT enthusiast and DevOps Engineers.

OSCONF 2020 Kochi Conference | KubeZilla | 27 June 2020Ajeet Singh Raina

Accelerate Your Automation Testing Effort using TestProject & Docker | Docker...Ajeet Singh Raina

Accelerate Your Test Automation using TestProject & Docker  A recording of a live webinar hosted on May 17th, 2020 - Learn from Docker Captain Ajeet Singh Raina how you can leverage TestProject Agents running in Docker containers, easily setup virtual labs & run tests in parallel. - Introduction to TestProject - Why TestProject for Automation? - A Brief about TestProject Agents - Why Docker? - Why run TestProject Agents inside Docker containers? - Live Demo - Game with Prizes!

OSCONF 2020 Bengaluru | Powered by Collabnix | Keynote SlidesAjeet Singh Raina

The Year 2020 is going to be super exciting for "Developers". As rightly stated by Scott Johnston, Chief Product Officer, Docker. Inc "Addressing the needs of developers has been core to Docker since its inception. Developers want the freedom to choose their own tools, the flexibility to quickly try new technologies and the ability to deploy their applications anywhere, independent of the underlying infrastructure,” Going forward, Docker Inc is going to focus on Docker Desktop, Docker Hub & Docker Compose's roles in the developer workflow for modern apps. Docker will be investing in expanding cloud services to enable developers to quickly discover technologies for use when building applications, to easily share these apps with teammates and the community, and to run apps frictionlessly on any Kubernetes endpoint, whether locally or in the cloud. This year starting Jan 18th, Docker Bangalore Meetup community kickstarted 2020 with really exciting topics around Docker, Kubernetes & latest announcement from Kubecon. Links to get Started with Docker/Kubernetes: Collabnix - https://collabnix.com DockerLabs - http://dockerlabs.collabnix.com Kubelabs - http://kubelabs.collabnix.com Kubetools - http://kubetools.collabnix.com Gopherlabs - http://gopherlabs.collabnix.com #Docker #Kubernetes #dockerlabs #cloudnative

Top 5 Helpful Tips to Grow Your Local Docker CommunityAjeet Singh Raina

The document provides 5 tips for growing a local Docker community: 1) be consistent with frequent meetup events, 2) choose a collaborative meetup platform, 3) actively engage on social media, 4) do not limit RSVP numbers but seek larger venues, and 5) create exciting event titles based on community feedback. It also provides two bonus tips: maintain meetup records on GitHub and collaborate on joint meetups with other groups initially.

Awesome Traefik - Ingress Controller for Kubernetes - Swapnasagar PradhanAjeet Singh Raina

Demystifying the Nuts & Bolts of Kubernetes ArchitectureAjeet Singh Raina

The document summarizes the architecture of Kubernetes. It uses an analogy of cargo ships and control ships to explain the different components. The master node components like the scheduler, ETCD cluster, and controller manager manage and monitor the worker nodes. The worker node components like Kubelet and kube-proxy run on each node and ensure pods and containers are running properly and can communicate. Pods are the basic building blocks that can contain one or more containers.

Kubernetes Monitoring & Best PracticesAjeet Singh Raina

Current State of Docker Platform - Nov 2019Ajeet Singh Raina

Collabnix Online Webinar: Integrated Log Analytics & Monitoring using Docker ...Ajeet Singh Raina

Prashansa Kulshrestha is currently pursuing B. Tech in Computer Science with Specialization in Cloud Computing and Virtualization Technology at UPES, Dehradun. She is Red Hat OpenShift Certified Engineer as well as RHCE too. She has experience working on Docker, Docker Compose & Docker Swarm. She is an active contributor of Docker Labs. She is expert in Python and well acquainted with AWS. She recently implemented Log analytics tool using Elastic Stack and Docker and want to share her learning and experience with Collabnix Community.

Simplifying Real Time Data Analytics with Docker, IoT & CloudAjeet Singh Raina

Introducing Pico - Object Detection & Analytics using Docker, IoT & Amazon Re...Ajeet Singh Raina

Collabnix Online Webinar - Demystifying Docker & Kubernetes Networking by Bal...Ajeet Singh Raina