Dockerize and Ship it

Intro to Docker

What is Docker?

Docker is an open source platform for building, deploying, and managing containerized applications.

 

Containers simplify the delivery of distributed applications and have become increasingly popular as organizations shift to cloud-native development and hybrid multicloud environments.

Docker vs Virtual Machines

Docker vs Virtual Machines

Benefits of apps inside containers

  • Less startup time.
  • Better resource distribution.
  • Direct access to the hardware.

History

Docker was created by Salomon Hykes as an internal project in dotCloud presented in 2013 at the PyCon.

 

The Docker runtime was written in Go, nowadays the biggest contributors to this project have been Google, Microsoft, IBM, Huawei, Red Hat y el Docker Team.

 

 

Benefits of using Docker

  • Fast (deployment, migration, restart).
  • Lightweight (Disk & CPU)
  • Open Source.
  • Portable apps.
  • Microservices and integrations (APIs)
  • DevOps Simplifications
  • Version Control Software

Docker commons uses

  • Sandbox environments (develop, test, debug).
  • Continuo integrations and Deployment.
  • Application scaling.
  • Desarrollo colaborativo.
  • Infrastructura configurations.
  • Local development.
  • Applications multi-tier.
  • PaaS and SaaS.

Docker Architecture

Docker Image

Text

Docker Container

Dockerfile

Text file containing the commands used by the user to create an image.

FROM busybox
MAINTAINER Gustavo Gimenez <gimenezanderson@gmail.com>
RUN mkdir /app
ADD build/geo /app
RUN mkdir /app/data
RUN chmod -R 777 /app
EXPOSE 4000

CMD ["./app/geo"]

Docker commands

Most used docker commands

// Información general
man docker // man docker-run
docker help // docker help run
docker info
docker version
docker network ls

// Imagenes
docker images // docker [IMAGE_NAME]
docker pull [IMAGE] // docker push [IMAGE]

// Contenedores
docker run
docker ps // docker ps -a, docker ps -l
docker stop/start/restart [CONTAINER]
docker stats [CONTAINER]
docker top [CONTAINER]
docker port [CONTAINER]
docker inspect [CONTAINER]
docker inspect -f "{{ .State.StartedAt }}" [CONTAINER]
docker rm [CONTAINER]

Examples

SSH inside a container

docker pull ubuntu
docker run -it --name ubuntu_example ubuntu /bin/bash

Example

Build an Image

FROM busybox
MAINTAINER Gustavo Gimenez <gimenezanderson@gmail.com>
RUN mkdir /app
ADD build/server /app
RUN mkdir images
ADD images /images
RUN chmod -R 777 /app
EXPOSE 9000

ENTRYPOINT "/app/server"

Dockerfile

// Build image
docker build -t image-server .

// Run it
docker run -d -p 9000:9000 --name server-ex image-server

Commands

Example

Docker Volume

// Run it
docker run -d -p 8080:90 --name volume-server-example -v $(pwd):/usr/share/nginx/html nginx

Using a nginx server

Example

Test Docker Image

FROM ruby:2.3.3
RUN apt-get update -qq && apt-get install -y build-essential libpq-dev
RUN mkdir /app
WORKDIR /app
ADD Gemfile /app/Gemfile
ADD Gemfile.lock /app/Gemfile.lock
RUN bundle install
ADD . /app

Dockerfile

 

docker run -it --name sinatra-test sinatra-app rspec spec/app_spec.rb

Run image

Example

Test Docker Image

FROM gusga/sinatra-app:0.1
CMD [ "sh", "-c", "rspec"]

Build image

docker run -it --name sinatra-test sinatra-app rspec spec/app_spec.rb

Run it

docker build -f Dockerfile.test -t sinatra-test-image .

Dockerfile.test

Example

Share Image

FROM ruby:2.3.3
RUN apt-get update -qq && apt-get install -y build-essential libpq-dev
RUN mkdir /app
WORKDIR /app
ADD Gemfile /app/Gemfile
ADD Gemfile.lock /app/Gemfile.lock
RUN bundle install
ADD . /app

Build image

docker push gust/sinatra-app

Publish

docker build . -t gusga/sinatra-app

Dockerfile file

Docker runtime alternatives

Rkt

Linux Containers LCX 

LXD container hypervisor

Docker Services

Tipo Software
Clustering/orchestration Swarm, Kubernetes, Marathon, MaestroNG, decking, shipyard
Docker registries Portus, Docker Distribution, hub.docker.com, quay.io, Google container registry, Artifactory, projectatomic.io
PaaS with Docker Rancher, Tsuru, dokku, flynn, Octohost, DEIS
OS made of Containers RancherOS

Beyond Docker

Cloud Native Apps

Cloud Native Apps

Stack

Cloud Native Apps

Stack

Dockerize - SP500

By Gustavo Giménez

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Dockerize - SP500

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