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WORKSHOP

Rafael Dutra

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WHO AM I?

  • Rafael Dutra
  • SysAdmin and DevOps Enthusiast
  • Security Information - UNISINOS 2008 - ?
  • Linux user since 2005
  • Docker user since 2015
  • PHP (Laravel)/Shell/Ruby

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WORKING WITH/AT

Vagrant, Puppet, Terraform, Continuous Integration, Continuous Deployment, Shell Scripting, Docker, AWS (learning) ...

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Shared Services Ops Team

@crossover - https://crossover.com

@jivesoftware - https://jivesoftware.com

@aurea - https://www.aurea.com

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AGENDA

  • What’s Docker?
  • Container vs Virtual Machine
  • Why should I use Docker?
  • Terminology
  • Images and Layers
  • Containers and Layers
  • Dockerfile anatomy

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WHAT'S DOCKER?

  • Open Source technology
  • Agility, accelerate software development and deployment
  • Portability, eliminate the "works on my machine"
  • Container is not Virtual Machine

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CONTAINER VS VIRTUAL MACHINES

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WHY SHOULD I USE DOCKER?

  • Infrastructure as Code - IAC
  • All application is an image
  • Works on my machine, no more!
  • Set up locally the same environment that you have in production, or any other environment
  • Tests, a lot of them
  • Community

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TERMINOLOGY

  • Images = is our “how it was built” / what we want to run
  • Containers = runs images in a dynamic way. By dynamic I meant: multiple containers can run the same image doing different things.
  • Volumes = where we want to store our data, could be our physical directory or a docker volume

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IMAGES AND LAYERS

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CONTAINERS AND LAYERS

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DOCKERFILE

# base image

FROM nginx

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# copy a file to a specific directory

COPY index.html /usr/share/nginx/html

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# running the application

CMD ["nginx", "-g", "daemon off;"]

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HANDS ON

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HANDS ON AGENDA

  • Docker installation
  • The basics, running containers
  • Interacting with containers
  • Dockerfile
  • Using volumes
  • Docker Compose

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DOCKER INSTALLATION

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curl -fsSL https://get.docker.com -o get-docker.sh

sudo sh get-docker.sh

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DOCKER BASICS

Full commands

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docker

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DOCKER BASICS

Need a medic? ask for help

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docker <command> --help

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DOCKER BASICS

Running our first container

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docker run alpine hostname

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DOCKER BASICS

Running our second container

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docker run hello-world

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DOCKER BASICS

Everything comes from an image

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docker run alpine hostname

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DOCKER BASICS

To list all images

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docker image ls

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DOCKER BASICS

To search an image

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docker search alpine

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DOCKER BASICS

To pull (download) an image

docker image pull ubuntu

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DOCKER BASICS

To pull (download) an specific image version

docker image pull ubuntu:17.10

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DOCKER BASICS

Running our first web container

docker run --detach --publish 45000:80 nginx

  • action that we want to do
  • options to detach (run it in background) and publish ports
  • port that we want to access in our machine
  • port running in the container
  • image we are using at this moment

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MANIPULATE CONTAINERS

To list running containers

docker container ls

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MANIPULATE CONTAINERS

To list all containers

docker container ls -a

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MANIPULATE CONTAINERS

Stopping a container

docker container stop <id>

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MANIPULATE CONTAINERS

Starting a container

docker container start <id>

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MANIPULATE CONTAINERS

Interacting with them

docker run --interactive --tty ubuntu /bin/bash

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MANIPULATE CONTAINERS

Executing …. something without enter in a container

docker exec <id> <command>

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MANIPULATE CONTAINERS

Attaching.�important: Containers needs some “bash/sh” running

docker attach <id>

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MANIPULATE IMAGES

To remove an image

Important: Only containers removed

docker image rm alpine

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CREATING IMAGES (Dockerfile)

FROM php:7.2.5-cli-alpine3.7

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CMD ["php", "--version"]

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CREATING IMAGES

docker build --tag fossday/php:7.2 .

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RUN FORREST … RUN

docker run --rm fossday/php:7.2

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RUN FORREST … RUN

docker run --rm fossday/php:7.2 --help

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RUN FORREST … RUN WITH MATH

<?php

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$val1 = 60;

$val2 = 20;

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echo "Soma de ${val1} + ${val2} igual a: " . ($val1 + $val2) . "\n";

Lets create a file called: soma.php

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RUN FORREST … RUN

docker run --rm \

-v $(pwd)/soma.php:/root/soma.php \

fossday/php:7.2 \

php -f /root/soma.php

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CLEANING

Remove all containers that are in stopped state (dangling)

docker container prune

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DOCKER COMPOSE

  • Orchestrate containers
  • YAML
  • Single file: docker-compose.yaml
  • Multi containers

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DOCKER COMPOSE INSTALLATION

https://goo.gl/8mbW87

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DOCKER COMPOSE

docker-compose up -d

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HERE WE GO

QUESTIONS ?

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GET IN TOUCH

https://rafaeldutra.me

https://docker.rafaeldutra.me

https://linkedin.com/in/rafaeldutra

@raffaeldutra

raffaeldutra@gmail.com

https://github.com/raffaeldutra

https://speakerdeck.com/raffaeldutra

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SEE YOU LATER

THANK YOU