RIDING THE NEXT WAVE:

DOCKER Containers

@KendrickColeman

Slideware courtesy of Docker

Why Docker?

Why docker?

WHY DOCKER?

WHY Docker?

WHY DOCKER?

Why Docker?

Why Docker?

Why Developers Care

  • Build once... run anywhere
    • A clean, safe, hygienic and portable runtime environment for your app.
    • No worries about missing dependencies, packages and other pain points during subsequent deployments.
    • Run each app in its own isolated container,  so you can run various versions of libraries and other dependencies for each app without worrying
    • Automate testing, integration, packaging…anything you can script
    • Reduce/eliminate concerns about compatibility on different platforms, either your own or your customers.
    • Cheap, zero-penalty containers to deploy services? A VM without the overhead of a VM? Instant replay and reset of image snapshots? That’s the power of Docker

Why DevOps Care

  • Configure once... run anything
    • Make the entire life-cycle more efficient, consistent, and repeatable
    • Increase the quality of code produced by developers.
    • Eliminate inconsistencies between development, test, production, and customer environments
    • Support segregation of duties
    • Significantly improves the speed and reliability of continuous deployment and continuous integration systems
    • Because the containers are so lightweight, address significant performance, costs, deployment, and portability issues normally associated with VMs

Containers vs VMs


docker workflow

  • Find a base image from registry.hub.docker.com
    •  docker pull <image name>

Docker Workflow

  • build your application from that image
  • commit the container to a new image
    •  docker commit <container id> user/image
  • push the image to the docker registry (public or private)
    •  docker push user/image


Docker Workflow

  • The image in the repository can be deployed anywhere

Docker links

  • Applications are rarely monolithic
    • App, Web, & DB
  • Create containers, expose ports, and link them
docker run -d --name docker_mysql -p 3306:3306 -e MYSQL_PASS="87654321" tutum/mysql 
docker run --name docker_wordpress01 --link docker_mysql:mysql -e WORDPRESS_DB_USER="admin" -e WORDPRESS_DB_PASSWORD="87654321" -e WORDPRESS_DB_NAME="docker_wordpress01" -p 8080:
80 -d wordpress

Dockerfile

  • Like a Chef Cookbook but for creating Docker containers


From tutum / mysql

FROM ubuntu:trusty
MAINTAINER Fernando Mayo <fernando@tutum.co>, Feng Honglin <hfeng@tutum.co>

# Install packages
RUN apt-get update
RUN DEBIAN_FRONTEND=noninteractive apt-get -y install mysql-server-5.6 pwgen
# Remove pre-installed database
RUN rm -rf /var/lib/mysql/*

# Add MySQL configuration
ADD my.cnf /etc/mysql/conf.d/my.cnf
ADD mysqld_charset.cnf /etc/mysql/conf.d/mysqld_charset.cnf

# Add MySQL scripts
ADD create_mysql_admin_user.sh /create_mysql_admin_user.sh
ADD import_sql.sh /import_sql.sh
ADD run.sh /run.sh
RUN chmod 755 /*.sh

# Exposed ENV
ENV MYSQL_PASS **Random**

# Add VOLUMEs to allow backup of config and databases
VOLUME  ["/etc/mysql", "/var/lib/mysql"]

EXPOSE 3306
CMD ["/run.sh"]
  • Tutorial - http://blog.flux7.com/blogs/docker/docker-tutorial-series-part-3-automation-is-the-word-using-dockerfile

docker projects to watch

  • Kubernetes from Google
    • an open source implementation of container cluster management
  • Helios from Spotify
    • orchestration platform for deploying & managing containers across a fleet
  • Centurion from NewRelic
    • Takes containers from a Docker registry and runs them on a fleet of hosts with the correct environment variables, host volume & port mappings
  • Solumn for OpenStack
    • Convert code into a managed application running on an OpenStack cloud
  • Clocker from Apache Brooklyn
    • Contains Brooklyn entities, locations and examples that create a Docker cloud infrastructure
  • libswarm from Docker
    • defines a standard interface for services in a distributed system to communicate with each other
    • libchan from Docker
      • networking library which lets network services communicate in the same way that goroutines communicate using channels

      ecosystem startups

      DOCKER CONTAINER HOSTING

      • stackdock.com - Docker hosting on blazing fast dedicated infrastructure
      • orchardup.com - Host your Docker containers in the cloud
      • tutum.co - IaaS-like control, PaaS-like speed
      PRIVATE DOCKER REGISTRY
      • quay.io - Secure hosting for private Docker repositories
      DOCKER PaaS
      • flynn.io - The product that ops provides to developers
      • deis.io - PaaS that makes it easy to deploy and manage applications
      • dokku - Docker powered mini-Heroku.

      DOCKER SERVICE DISCOVERY

      • skydock - Automagic Service Discovery
      • docker-discover - service discovery container that leverages haproxy and etcd

      LINUX ENGINEERED FOR DOCKER

      • CoreOS.com - Linux for Massive Server Deployments
      • ProjectAtomic.io - container-based application and service deployment with trusted operating system platforms

      GET Started with Docker

      DEMO!






      Docker images used:

      Ubuntu (official): https://registry.hub.docker.com/_/ubuntu/

      WordPress (official): https://registry.hub.docker.com/_/wordpress/

      MySQL (tutum): https://registry.hub.docker.com/u/tutum/mysql/

      THANK YOU!

      @KendrickColeman

      www.kendrickcoleman.com

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