Lightweight Microservice blue-green deployment

Talk from Phil Lombardi at Boston DevOps meetup 3/23/2016

Transcript

1. Lightweight Microservice blue-green deployment Using Travis-CI, Packer, Terraform and AWS
2. • Philip Lombardi - Captain of the Cloud @ Datawire.io • Datawire is building open source developer tools and infrastructure for teams adopting / scaling microservices • We use a microservice architecture for our admittedly early system right now. • Build and deploy services quickly using Travis-CI, Packer, Terraform and AWS w/ blue-green releases.
3. • Methodology for updating an app or service with zero downtime. • Ensures high-availability. • Ensures a rollback path is preserved (just in case). • Easy to reason about and the tooling is simple. • Often implemented by switching LB backend records, but other strategies exist. Blue-Green who and what? Servers LB Servers
4. Datawire Flow (simplified): Compile + Unit Tests More Tests Packer: Bake AMI Swap! Developer Query “current” Color Update Terraform Config (color, ami, cluster size) $terraform apply Verify new color. Downscale old color.
5. Swapping in Detail LB Starting State (active blue) Service Cluster (size: 10) Service Cluster (size: 0) Launch Config (v: 1) Launch Config (v: 1)
6. Swapping in Detail LB Upgrading: Replace Green Launch Config (active blue) Service Cluster (size: 10) Service Cluster (size: 0) Launch Config (v: 1) Launch Config (v: 2) Launch Config (v: 1)
7. Swapping in Detail LB Upgrading: Scale up Green (active blue) Service Cluster (size: 10) Service Cluster (size: 10) Launch Config (v: 1) Launch Config (v: 2)
8. Swapping in Detail LB Upgrading: Attach Green to LB (active blue + green) Service Cluster (size: 10) Service Cluster (size: 10) Launch Config (v: 1) Launch Config (v: 2)
9. Swapping in Detail LB Upgrading: Monitor Service (active blue + green) Service Cluster (size: 10) Service Cluster (size: 10) Launch Config (v: 1) Launch Config (v: 2)
10. Swapping in Detail LB Upgrading: Standby Blue (active green) Service Cluster (size: 10) Service Cluster (size: 10) Launch Config (v: 1) Launch Config (v: 2) “Standby” to allow blue to finish in-progress work
11. Swapping in Detail LB Upgrading: Detach Blue (active green) Service Cluster (size: 10) Service Cluster (size: 10) Launch Config (v: 1) Launch Config (v: 2)
12. Swapping in Detail LB Upgrading: Downscale Blue (active green) Service Cluster (size: 0) Service Cluster (size: 10) Launch Config (v: 1) Launch Config (v: 2)
13. Questions or comments? Check us out: https://datawire.io … we’re hiring! Organization GitHub: https://github.com/datawire More about microservices: microservices.com Sample GitHub Repository: https://github.com/datawire/blue-green-example Email Address: plombardi@datawire.io