The document discusses Docker, Docker Machine, Docker Swarm, and how to build a scalable system using these technologies. It describes Docker as a way to package applications and dependencies into containers. Docker Machine allows creating Docker hosts on local computers, cloud providers, or data centers. Docker Swarm provides native clustering for Docker. The document outlines processes for creating a Swarm master and agents and shows how to design an architecture using Docker Gen to generate configs, Nginx as a reverse proxy, and NodeJS applications running in containers.

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Infinite Scalable Systems with
Docker
Huseyin BABAL
Full-Stack Software Engineer @ GittiGidiyor

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Docker

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What is Docker
Docker lets you to package application with its dependencies like code,
runtime, system libraries, etc. inside one container

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VM vs Docker
Infrastructure Infrastructure
Host OS OS
Hypervisor Docker Engine
Guest OS Guest OS Guest OS
bins/libs bins/libs bins/libs
app1 app2 app3
bins/libs bins/libs bins/libs
app1 app2 app3

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Docker Machine

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What is Docker Machine?
Docker Machine lets you to create Docker host
and specific client to connect Docker on local
computer, cloud providers, even in your own
data center.

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Creating Docker Machine
docker-machine create -d virtualbox default

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Docker Swarm

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What is Docker Swarm?
Native clustering for Docker

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Howto Create Swarm?
SID=docker run swarm create
$SID will be used on clustering

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Master Create
docker-machine create
-d virtualbox
--swarm
--swarm-master
--swarm-discovery token://$SID
swarm-master

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Agent Create
docker-machine create
-d virtualbox
--swarm
--swarm-discovery token://$SID
swarm-agent-00

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Swarm Master Process

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Swarm Agent Process

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Swarm Relay Network

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Architectural Design

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Components
docker-gen Image
Nginx
NodeJS Application

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Docker Project

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docker-gen Image
Generates files from docker container metadata
● Centralized Logging
● Log Rotation
● Reverse Proxy Configs
● Service Discovery

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How to Build?
docker build -t docker-gen ./docker-gen

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How to Run?
docker run -d --restart=always --name=docker-gen
--env=affinity:image==docker-gen:latest
--env=DOCKER_HOST=tcp://192.168.99.103:3376 docker-gen

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Nginx

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How to Run?
docker run -d --restart=always --name=nginx -p 80:80 --
volumes-from=docker-gen nginx

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http {
upstream api.nodejs.com {
server 192.168.99.100:5001;
server 192.168.99.100:5002;
}
server {
listen 80;
location / {
proxy_pass http://api.nodejs.com;
}
}
}

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NodeJS Application

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How to Run?
docker run -d --restart=always -p 3000 --name hello-
express-1 -P --env VHOST=api.nodejs.com
huseyinbabal/express-hello

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Load
Balancer
swarm-agent-01
swarm-agent-02
swarm-master
Docker
Gen

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Show Time!
You can clone project here

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Thank you!
Questions?Questions?
@huseyinbabal
+HüseyinBABAL
http://huseyinbabal.net