Zero-downtime Deployment

This presentation shows different techniques to achieve zero-downtime deployment with HAProxy, Nginx and Unicorn.

Transcript

1. Zero-downtime Deployment London Ruby User Group, London 2012 Jairo Diaz, @codescrum
2. Zero-downtime Deployment London Ruby User Group, London 2012 Jairo Diaz, @codescrum
3. We will go through three options • Using a HAProxy • Using Nginx • Using Unicorn
4. Using HAProxy (load balancer) website.com Load Balancer Old Instance WebApp New Instance webApp MySQL Push
5. HAProxy.conf
6. Rails Implementation as middleware
7. Rails Healthcheck Middleware Implementation
8. Using Nginx (reverse proxy) website.com Reverse Proxy Cached Application New Instance webApp MySQL (Only for read only mode, i.e directory service)
9. Ngnix.conf
10. Using Unicorn website.com Reverse Proxy MySQL New Unicorn master Unicorn workers Unicorn workers Unicorn workers Shared Socket Pull Old Unicorn master Unicorn workers Unicorn workers Unicorn workers
11. /etc/init.d/unicorn restart
12. Config for Unicorn: unicorn. conf
13. Handling Database updates • Perform separate migrations when renaming columns
14. Questions?