The document discusses the transition from EC2 Classic to a Virtual Private Cloud (VPC) setup at SeatGeek, highlighting the benefits of improved network and security control, flexibility, and operational efficiency. It details the service discovery process using Consul, illustrating the advantages of the current setup over the old system while noting lessons learned during the migration. The presentation includes essential links for further reading and information about job opportunities at SeatGeek.

1. Service Discovery:
From Classic to VPC
Speaker: Mark Corwin
Systems Engineer @ SeatGeek

2. Myself
Mark Corwin
Systems Engineer, SeatGeek
@mjcdiggity
github.com/mjcdiggity
speakerdeck.com/mjcdiggity
http://bit.ly/23d0eEH

3. SeatGeek
• "Kayak for live events"
• Ticket Marketplace
• ~8 million users on platform
• ~30 Developers, 3 Ops
• ~150 Servers
• PHP/Python/Go/Ruby/JS
• Chef/Ansible
• AWS/Heroku/Linode

4. Agenda
1. What is VPC, and why do I care?
2. Setting up a VPC
3. Case Study: Service Discovery at SeatGeek
4. Lessons Learned

5. EC2 Classic
• Standard Cloud Offering
• Public Nodes with Internet Access
• Shared Tenancy
• Security controlled by Security Groups

6. VPC
• Virtual Private Cloud
• Public or Private Nodes
• Dedicated or Shared Tenancy
• Multiple Security Layers

7. Why VPC?
• Network/Security Control
• Decrease footprint on open Internet
• Flexibility
• Latest features and hardware

8. Latest Instance Types
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-types.html

9. Why Now?
• Upgrade
• Additional Operational Bandwidth
• Experience
• EC2 ClassicLink

10. SeatGeek VPCs

11. Getting started with VPC
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Scenario1.html

12. Other common VPC scenarios
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Scenarios.html

13. VPC with Public and Private Subnets (NAT)
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Scenario2.html

14. Back to SeatGeek's VPCs

15. Production/Staging Breakdown

16. EC2 ClassicLink
• Communicate between EC2 Classic and VPC
• Can link to one ClassicLink enabled VPC
• Requires enabling in VPC and Instances
• 10.0.0.0/16 and 10.0.0.0/8

17. VPN Breakdown

18. Final Look

19. VPC Advice and Wisdom
• Overprovision
• "Measure twice, cut once"
• ClassicLink

20. Case Study:
Service Discovery at
SeatGeek

21. What is Service Discovery?
• Lookup • Registration

22. Consul
http://bit.ly/1PDJkVz

23. Old Setup

31. Old Setup
Pros:
• Simplicity
• Good for Static Infrastructure
Cons:
• Complexity
• Single point of failure
• Delayed response
• Fleet management is difficult

32. Current Setup

42. Consul Cluster

43. Problems Solved
• Consul used as Discovery Service
• Removes single point of failure
• Real time response
• Passive solution

44. New Problems
• External Services
• Consul Template

45. Unbound

46. Consul Template
https://github.com/hashicorp/consul-template/issues/331

47. Migration
1. Setup Consul Cluster
2. Register Services in Consul
3. Use Consul for Service Lookup
4. Recycle nodes into VPC

48. Current Progress
1. Setup Consul Cluster
2. Register Services in Consul
3. Use Consul for Service Lookup
4. Recycle nodes into VPC

49. Lessons Learned
• Know your applications
• DNS/Networking
• What problem are you trying to solve?

50. Start using AWS VPC today!

51. We're hiring...

52. https://seatgeek.com/jobs

53. Questions?