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Docker

Denis Germano @ Grupy-RP

Crave Food Systems

A little of the history

+++

Physical servers

@ul

  • One service for each server
    • Apache
    • Nginx
    • Tomcat
    • MySQL
    • MongoDb
    • Microsoft IIS @ulend

+++

Physical servers

@ul

  • One OS for each server
    • Some Linux
    • Windows server @ulend

+++

Problems

@ul

  • Costs
    • Hardware
    • License
    • Light
    • Network
    • Time
  • Unused capacity @ulend

+++

Solution

@ul

  • Virtualization
  • Several VM over a hypervisor @ulend

+++

@ul

  • One server, severals virtualized OS
  • Less physical servers
  • Less cost
    • Hardware
    • Network
    • Light
    • Time
  • Optimazed capacity @ulend

+++

Problems

@ul

  • Each VM requires a minimum of RAM, Disk, CPU
    • Each OS on VM requires a full installation
  • Costs of configuration
    • Open/Close ports
    • Install specific libraries
    • All necessary OS configuration @ulend

+++

Solution

@ul

  • Containers
    • One container for each application
    • All container over one OS
    • The container share the OS resources
  • Advantages
    • No OS
    • Light weight
    • Fast start up @ulend

+++

Why not?

@ul

  • Just install all the application on OS
    • Same port
    • Same application use all RAM (JAVA?)
    • Distinct version for each application
      • Java7, Java8
      • Python 2.7, Python 3.5
    • High CPU @ulend

+++

Containers

@ul

  • Isolation
  • CPU limited
  • Network limited
  • Each container with its own Python @ulend

From dotCloud to Docker

+++

@ul

  • PaaS
    • Heroku
    • MS Azure
    • GCP
  • AWS
  • Container
  • Docker @ulend

+++

Docker

@ul Docker is nothing more than a collection of technologies to facilitate the deploy and execution of our applications @ulend

+++

Technologies

@ul

  • Docker Engine
    • Control the containers
    • OS communication
  • Docker Compose
    • Manage several containers
  • Docker Swarm
    • Manage several Docker Engines (Cluster)
  • Docker Hub/Store
  • Docker Machine
  • Docker Tool Box @ulend

+++

Open Source

+++

Hello World!!!

Images

+++

@ul

  • Read only
  • Layers
    • Shared layers @ulend

+++

Some commands

+++

@ul

  • docker run image
  • docker run -it image
  • docker run -it --name image
  • docker ps
  • docker ps -a
  • docker start container
  • docker start -i container
  • docker stop container
  • docker rm container
  • docker rmi image
  • docker image prune
  • docker container prune @ulend

Volumes

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Data persistence

+++

Some commands

+++

@ul

  • docker inspect container
  • docker run -v "docker-path" image command
  • docker run -v "local-path:docker-path" image command
  • docker run -p local-port:docker-port -v "local-path:docker-path" image command
  • docker run -p local-port:docker-port -v "local-path:docker-path" -w "working-dir" image command @ulend

My precious

+++

My image

+++

Dockerfile

+++

Main commands

@ul

  • FROM
  • MAINTAINER
  • COPY
  • WORKDIR
  • RUN
  • EXPOSE
  • ENTRYPOINT @ulend

+++

Some commands

+++

@ul

  • docker build path-to-dockerfile
  • docker build -f Dockerfile path-to-dockerfile
  • docker build -f Dockerfile -t username/image-name path-to-dockerfile
  • docker login
  • docker push username/image-name
  • docker pull username/iamge-name @ulend

+++

Sample

FROM python
MAINTAINER Denis Germano
COPY . /code/grupy
WORKDIR /code/grupy/project
RUN pip install django
RUN django-admin startproject project .
RUN ./manage.py migrate
ENTRYPOINT ./manage.py runserver 0:8000
EXPOSE 8000

Network

+++

@ul

  • Default: bridge
    • Access only through IP
  • Create a new network to access through the name @ulend

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Some commands

+++

@ul

  • docker network create name @ulend

What's next

@ul

  • Docker Compose
  • Docker Swarm
  • Kubernetes @ulend

Thank you