CoreOS & Docker

A brief introduction from the point of view of a developer creating a development environment.

Transcript

1. Docker & CoreOS Modularize your architecture
2. Purpose • Introduce the technology • Explain why it’s cool • Showcase the technology by example
3. http://docker.io
4. Docker manages repeatable, shareable linux containers, with git-like change management. Docker containers are modular, single- application service providers. What is it?
5. What’s a Linux Container? Technically, LXC containers. Like FreeBSD jails, they provide highly-isolated process environments and namespaced access to system resources. The only kernel/drivers that run are the host’s.
6. What does Docker add? A portable container image format, based on copy-on-write, layered file systems. Base filesystem images are shared, only differences are saved to the container.
7. http://coreos.com
8. • Linux Kernel + Docker + etcd • Read-only root filesystem • No package manager • Self auto-updating • Etcd = sophisticated orchestration What is it?
9. Why is it cool? You get a stable host dedicated to running docker instances, and nothing else. It’s never gonna: • Give you up. • Let you down. • Run around and desert you.
10. A demonstration by example
11. • We work with a lot of websites • Want a quick & easy localhost with no fuss • Something easily given to new developers Motivation
12. The Server-Side Bits • Apache + mod_php + mysql • Apache’s mod_vhost_alias gives us wildcard virtual hosts ◦ test.dsdev -> /var/www/test/public_html/ • Dnsmasq let’s us point *.dsdev at a virtual machine ◦ test.dsdev -> vm’s IP
13. Let’s take to our trusty terminals and give this all a shot. Play Time!
14. See it All Together I’ve polished and published what we just did on github. https://github.com/EpocSquadron/coreos-devenv