This document provides an overview of Docker basics including requirements, software, architecture, and concepts. It discusses traditional servers, virtual machines, and containers. Key advantages and disadvantages of each approach are listed. Docker concepts like images, containers, layers, Dockerfile, registry, and hub are defined. Common Docker commands are also outlined.

1. Docker basics

2. Requirements
Install and configure operating systems
TCP/IP
CLI semi expert
CLI editors (nano, vim, …)
Virtual machines environments

3. Software
Application
Services

4. Architecture
Traditional servers (bare metal)
Virtual machines
Containers

5. Traditional servers (bare metal)
Architecture

6. Traditional servers (bare metal)
Pros Cons
Raw resources use Slow deployment time
Isolation Expensive
Wasted resources
Difficult to scale
Difficult to migrate
Complex configuration
Architecture

7. Virtual machines
Architecture

8. Virtual machines
Pros Cons
Good use of resources Resource allocation
Easy to scale Vendor lockin
Easy to backup and migrate Complex configuration
Cost efficiency
Flexibility
Architecture

9. Containers
Architecture

10. Containers
Pros Cons
Isolation Architecture
Lightweight Resource heavy apps
Resource effective
Easy to migrate
Security
Low overhead
Mirror environments
Architecture

11. A container is a standard unit of software
that packages up code and all its
dependencies so the application runs
quickly and reliably from one computing
environment to another.
What is a container?

12. What is a container?
Container Engine

13. Volumes
Ports
Networks
Hosts
Links
What is a container? (own resources)

14. Docker is a tool designed to make
it easier to create, deploy, and run
applications by using containers.
What is docker?

15. Containers options
LXD

16. Basic concepts

17. Docker can build images automatically by reading the
instructions from a Dockerfile. A Dockerfile is a text
document that contains all the commands a user could
call on the command line to assemble an image. Using
docker build users can create an automated build that
executes several command-line instructions in
succession.
Dockerfile

18. FROM ubuntu:15.04
COPY . /app
RUN make /app
CMD python /app/app.py
Dockerfile

19. A Docker image is built up from a series
of layers. Each layer represents an
instruction in the image’s Dockerfile.
Each layer except the very last one is
read-only.
Docker layers

20. Docker layers

21. A Docker image is a file, comprised of multiple
layers, used to execute code in a Docker
container. An image is essentially built from the
instructions for a complete and executable
version of an application, which relies on the
host OS kernel.
Docker image

22. Docker architecture

23. A container is launched by running an image. An image is an
executable package that includes everything needed to run an
application the code, a runtime, libraries, environment variables, and
configuration files.
A container is a runtime instance of an image what the image becomes
in memory when executed (that is, an image with state, or a user
process). You can see a list of your running containers with the
command, docker ps, just as you would in Linux.
Docker image vs. container

24. The Registry is a stateless, highly
scalable server side application that
stores and lets you distribute Docker
images. The Registry is open-source,
under the permissive Apache license.
Docker registry

25. Docker Hub is a cloud-based registry service which allows you
to link to code repositories, build your images and test them,
stores manually pushed images, and links to Docker Cloud so
you can deploy images to your hosts. It provides a centralized
resource for container image discovery, distribution and
change management, user and team collaboration, and
workflow automation throughout the development pipeline.
Docker hub

26. In case you want to store your own
images you can have a private
registry.
Private registries

27. A container is a standard unit of software
that packages up code and all its
dependencies so the application runs
quickly and reliably from one computing
environment to another.
Container

28. Environment

29. Application
Services
Image types

30. Local environment
Virtual Box
Your computer
Linux Debian

31. Docker images
Image Version Type
hello-world latest Application
golang 1.11.1-alpine Application
gcc latest Application
java 7 Application
mysql 5.6 Service
phpmyadmin/phpmyadmin latest Service
mongo latest Service
thinkcube/phpmoadmin latest Service
nginx stable-alpine Service
php 7.2.2-fpm-alpine Service
wordpress 4.9.8-php7.2-apache Service

32. CLI commands

33. Docker
docker —version Show docker version
docker info Display system information
docker rmi {image name} Delete specific image
docker —help Show help

34. Docker images
Command Description Example
docker images List all images
docker images image name List all images with a name
docker pull image name:[tag] Pull image from repository docker pull hello-world
docker history image name Show history of an image docker history hello-world
docker rmi image name Delete specific image docker rmi hello-world

35. Docker containers
docker container ls Show containers
docker ps Show containers

36. Run containers
docker run [OPTIONS] IMAGE[:TAG|
@DIGEST] [COMMAND] [ARG…]
docker run hello-world

37. Run containers
How to run a container and delete ir after
execute
docker run --rm hello-world

38. Run containers
If an image doesn’t exists
docker run automatically
trigger docker fetch and
download the image.

39. Docker containers
docker stop container Stop container
docker rm container Delete container

40. Docker containers - volumes
Volumes are the preferred
mechanism for persisting data
generated by and used by
Docker containers.

41. Docker containers - volumes
docker run
--rm
-v /home/docker/src/gcc:/src
gcc
gcc /src/hello-world.c -o /src/hello-world

42. Workshop TCP/IP ports
Image Port
phpmyadmin/phpmyadmin 8081
thinkcube/phpmoadmin 8082
nginx 8083
wordpress 8084

43. + /Paybook
Infrastructure Manager
Claudio Montoya
Thanks!
www.paybook.com