An Introduction to Vagrant and Docker Scott Lowe http://blog.scottlowe.org 

Before we begin ☞ Get involved! Audience participation is requested and encouraged. ☞ If you use Twitter, feel free to tweet about this session (use @NashvilleVMUG or hashtag #NashvilleVMUG) ☞ Feel free to take photos or videos of today's session and share them online ☞ A PDF copy of this presentation will be available online after the event 

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What is Vagrant? ☞ A CLI-based tool for streamlining the use of VM environments (creation, provisioning, usage, & decommissioning) ☞ Available from http://www.vagrantup.com 

A "VM environment"? ☞ Think of this as one or more VMs (based on a user-specified template) along with networking and possible in-guest software customization ☞ Examples ☞ The classic "3 tier" web/app/DB topology ☞ Trying out new technologies (CoreOS and etcd cluster, Open vSwitch) 

Use cases for Vagrant ☞ Sharing VM environments with other users ☞ Accelerating the creation of VM environments ☞ Automating software provisioning inside VM environments ☞ Providing a CLI for creating/destroying/accessing VM environments 

What are the components of Vagrant? 

Vagrant ☞ Written in Ruby ☞ Multi-platform (Windows, Linux, OS X) ☞ CLI (no GUI) 

Vagrant provider ☞ Interfaces with back-end virtualization solution ☞ Vagrant comes with a provider for VirtualBox ☞ Provider for VMware desktop products (Fusion & Workstation) available for a fee ☞ Other providers available as open source projects ☞ See https://github.com/gosddc for examples 

Vagrant box ☞ Template used when creating VM environments in Vagrant ☞ Boxes are provider-specific ☞ Packer is a related product that can be used to help build Vagrant boxes 

Vagrantfile ☞ A text file (written with Ruby syntax) that describes the VM environment 

Vagrant demo time! 

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What is Docker? ☞ A CLI tool for simplifying the use of Linux containers ☞ Available from https://www.docker.com 

What are Linux containers? ☞ Linux containers can be thought of as "lightweight virtualization" or "OS virtualization" ☞ Leverage features built into the Linux kernel (cgroups and namespaces) ☞ Linux containers have been around for a while, but weren't very easy to use 

Use cases for Docker ☞ Rapidly deploy (or un-deploy) containers ☞ Simplify the creation of custom container images ☞ Make sharing container images very easy 

What are the components of Docker? 

Docker daemon ☞ Responsible for spawning containers ☞ As a daemon, it runs in the background ☞ By default, listens on a local Unix socket (can be configured to listen on a network port) 

Docker client ☞ CLI client for interacting with the Docker daemon ☞ Can run locally on the same system as the daemon, or remotely (daemon must be listening on a network port) 

Docker image ☞ The contents of a Docker container ☞ Comprised of multiple filesystem layers ☞ Stored locally, can be shared via the Docker Hub ☞ Images can be based on other images 

Dockerfile ☞ A simple text file describing a Docker image 

Docker demo time! 

Docker + Vagrant = ? 

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Q&A 

Thank you! Be sure to provide feedback to the VMUG leaders regarding this session. Blog: http://blog.scottlowe.org Twitter: @scott_lowe GitHub: https://github.com/lowescott Life: Colossians 3:17