Slides from a streaming talk I did for the London Nodejs User's Group using GetYodlr.com

1. @RossKukulinski
Building a SaaS with
NodeJS, Docker, and
CoreOS
London Node Users’ Group
March 25, 2015

2. @RossKukulinski
@RossKukulinski
Yodlr Founder / CEO
BayNode Co-Organizer
Soccer Fanatic
rossk on Freenode

3. @RossKukulinski
What I’m going to Cover
• Our story
• Why Docker & CoreOS
• Tips & Tricks

5. @RossKukulinski
The internal tool that wasn’t
internal anymore

6. @RossKukulinski
12factor.net

7. @RossKukulinski
Our Goals
• Reduce application complexity (do one thing well!)
• Run multiple versions of the same app
• Consistent app from dev → test → staging → prod
• Scalable
• Fault tolerant
• Minimize time spent doing ‘devops’

8. @RossKukulinski
Docker

9. @RossKukulinski
VM vs Docker
https://docker.com/whatisdocker/

10. @RossKukulinski
• Containers start quickly
• Containers have small footprint
• “Dockerized” applications run anywhere
• Fast builds via cached images
• Registry for storing images from build pipeline
• Images can be stacked
• Abstracts app networking from system networking

11. @RossKukulinski
Our Goals
• Reduce application complexity (do one thing well!)
• Run multiple versions of the same app
• Consistent app from dev → test → staging → prod
• Scalable
• Fault tolerant
• Minimize time spent doing ‘devops’

12. @RossKukulinski
How do you ship
docker containers?
Bash scripts (ugh)
Ansible / Puppet / Chef
Docker Swarm (just released)

13. @RossKukulinski
Linux for Massive Server Deployments

14. @RossKukulinski
• Minimal Operating System
• Automated software updates
• Runs docker containers
• Supported by all major cloud
providers
• Can also run on bare metal
https://coreos.com/

15. @RossKukulinski
Fault Tolerant
• Clustered by default
• Support for multiple HA zones
• Distributed tools like etcd & fleet
• HTTP Key-Value Store
• Service Discovery
• Application Scheduling
https://coreos.com/

16. @RossKukulinski
Scalable
https://coreos.com/

17. @RossKukulinski
Goals
• Reduce application complexity (do one thing well!)
• Run multiple versions of the same app
• Consistent app from dev → test → staging → prod
• Scalable
• Fault tolerant
• Minimize time spent doing ‘devops’

18. @RossKukulinski
Now for the good stuff
Let’s talk tips & tricks

19. @RossKukulinski
Dockerizing NodeJS
App

21. @RossKukulinski
Docker Compose
https://coreos.com/

22. @RossKukulinski
Booting CoreOS

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Booting CoreOS Cluster
• Most frustrating part of the whole experience
• RTFM re: cloud_config.yml
• Use Ansible for easy provisioning
• Great resources:
• https://coreos.com/docs/
• https://www.digitalocean.com/community/
tutorial_series/getting-started-with-coreos-2

24. @RossKukulinski
npm install -g coreos-cluster-cli

25. @RossKukulinski
Service Discovery
“Sidekick Pattern”
http://tinyurl.com/redis-sk

26. @RossKukulinski
Confd
• https://github.com/kelseyhightower/confd
• Monitors etcd for changes to key:value pairs
• Writes updated config file based on Go template
• We use with nginx, could be anything!
http://tinyurl.com/redis-sk

27. @RossKukulinski
Monitoring CoreOS
with
https://github.com/yodlr/CoreGI

28. https://github.com/yodlr/CoreGI

29. @RossKukulinski
Continuous Deployment
with Paz
http://paz.sh

30. http://www.paz.sh/

31. @RossKukulinski
Other Tools
• Kubernetes (Powers Google Container Engine)
• Deis (Open-source heroku clone)
• Vulcan Proxy (https://vulcand.io/)

32. @RossKukulinski
etcd is a database
treat it like one

33. @RossKukulinski
Docker & CoreOS are the
future for application
development and
deployment
Write that down

34. @RossKukulinski
Thanks!
Questions?