Building A SaaS with CoreOS, Docker, and Etcd
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CoreOS Fest 2015 Ross Kukunski's presentation on the GetYodlr.com team's experience building scalable microservices using Rackspace, CoreOS, Docker, and etcd
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Building A SaaS with CoreOS, Docker, and Etcd
- 1. @RossKukulinski Building a SaaS with CoreOS and etcd CoreOS Fest May 4, 2015
- 2. @RossKukulinski Ross Kukulinski Yodlr Founder / CEO BayNode Co-Organizer iojs/nodejs Evangelist Soccer Fanatic ross@getyodlr.com
- 4. @RossKukulinski The internal tool that wasn’t internal anymore
- 5. @RossKukulinski Our Goals • Reduce application complexity • A/B test multiple versions of apps • Consistent app from dev → test → staging → prod • Scalable • Fault tolerant • Minimize time spent doing ‘devops’
- 7. @RossKukulinski Our Goals • Reduce application complexity • A/B test multiple versions of apps • Consistent app from dev → test → staging → prod • Scalable • Fault tolerant • Minimize time spent doing ‘devops’
- 8. @RossKukulinski How do you ship Docker containers?
- 9. @RossKukulinski Linux for Massive Server Deployments
- 10. @RossKukulinski Goals • Reduce application complexity • Run multiple versions of the same app • Consistent app from dev → test → staging → prod • Scalable • Fault tolerant • Minimize time spent doing ‘devops’
- 11. @RossKukulinski After further deliberation, we’re going big and switching to CoreOS/Docker entirely. We feel its the right direction long-term for us and application development in general. - Me, internal memo September 2014
- 12. Lightbulb! by Matthew WynnMonitor photo by Don Fulano
- 13. @RossKukulinski 1. etcd is a database So treat it like one
- 15. @RossKukulinski 2. etcd is a database For your real-time infrastructure state
- 16. @RossKukulinski Service Availability REST API microservice Sidekick Sidekick Pattern: 1. Get ip:port of microservice (docker inspect) 2. Health checks (containerized integration tests) 3. Publish service instance details to etcd etcd 1 & 2 3
- 17. @RossKukulinski Service Discovery haproxy confd Confd: 1. Query etcd for ip:port of upstream services 2. Update configuration from template 3. Reload load balancer process etcd github.com/kelseyhightower/confd 2 & 3 1
- 18. @RossKukulinski Dynamic external services DNS & Cloud Load Balancers lb-config lb-config: 1. Query etcd for domain/ip:port of internal lbs 2. Update DNS & external load balancers etcd 12 github.com/yodlr/rax-lb-config
- 20. @RossKukulinski 3. etcd is a database With super important data: Protect it! PSA: $private_ipv4 is probably not what you think it is
- 21. @RossKukulinski 4. Sometimes you just need a GUI (Docker & CoreOS do have awesome CLI tools though)
- 22. github.com/yodlr/CoreGI Also check out purpleworks/fleet-ui
- 23. @RossKukulinski 5. Fleet unit templates aren’t enough rest-api@.service rest-api@{1..3}.service —> 3 instances of the service
- 27. @RossKukulinski Rolling Deploys as a Service github.com/yodlr/fleet-rolling-deploys
- 28. @RossKukulinski Closing thoughts • Containers are awesome • We <3 CoreOS • You can get really far with fleet & etcd • Kubernetes is so close to primetime • Remember: etcd is a database, treat it like one