An Introduction to Vagrant and Docker

This presentation, given at the Nashville VMUG Converge 2015 event on April 8, 2015, provides an overview of Vagrant and Docker.

Transcript

1. An Introduction to Vagrant and Docker Scott Lowe http://blog.scottlowe.org
2. 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
4. What is Vagrant? ☞ A CLI-based tool for streamlining the use of VM environments (creation, provisioning, usage, & decommissioning) ☞ Available from http://www.vagrantup.com
5. 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)
6. 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
7. What are the components of Vagrant?
8. Vagrant ☞ Written in Ruby ☞ Multi-platform (Windows, Linux, OS X) ☞ CLI (no GUI)
9. 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
10. 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
11. Vagrantfile ☞ A text file (written with Ruby syntax) that describes the VM environment
12. Vagrant demo time!
14. What is Docker? ☞ A CLI tool for simplifying the use of Linux containers ☞ Available from https://www.docker.com
15. 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
16. Use cases for Docker ☞ Rapidly deploy (or un-deploy) containers ☞ Simplify the creation of custom container images ☞ Make sharing container images very easy
17. What are the components of Docker?
18. 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)
19. 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)
20. 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
21. Dockerfile ☞ A simple text file describing a Docker image
22. Docker demo time!
23. Docker + Vagrant = ?
25. Q&A
26. 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