Cyan Deployments @ Betterment w/ Ansible

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Cyansible Blending Blue/Green Deployments @Betterment

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Techcrunch Disrupt May 2010 90,000 customers, more every minute. Fastest growing automated investing service $2B+ Who are we?

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betterment : investing :: devops : engineering

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it’s 2012. let’s ship some code.

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Betterment@2012

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A Better Migration: From Snowflakes to Stormtroopers Wednesday, July 22, 6:30p - 8:00p @ AWS Pop-up Loft | NYC Shameless Plug:

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it’s 2015. let’s ship new code… without interrupting production

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● Predictable ● Repeatable ● Minimal Human Interaction ● Zero User Interruption ● Contained Failure Dream Delivery

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Blue/Green Deployments http://martinfowler.com/bliki/BlueGreenDeployment.html

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DNS ELB

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Pre-flight Checklist ❏ Stateless Servers ❏ Server Health Check ❏ Duplicate Full Stack including RDS Replica

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Wait. Two Databases? “There's still the issue of dealing with missed transactions while the green environment was live, but depending on your design you may be able to... ● feed transactions to both environments in such a way as to keep the blue environment as a backup when the green is live. Or you may be able to... ● put the application in read-only mode before cut-over, run it for a while in read-only mode, and then switch it to read-write mode.” http://martinfowler.com/bliki/BlueGreenDeployment.html

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“Code always works on Schema +1 ” (A.K.A. old code works on new schema)

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Publish, Migrate, Deploy

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Jenkins’ Job 1. Build 2. Test 3. Package 4. Publish 5. Run Migrations 6. Invoke Ansible 7. Cull Zombies

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Ansible’s Job 1. Check for S3 deliverables 2. Spin up new EC2 Instance(s) 3. Apply role(s) to instance(s) 4. Find instance(s) in ELB 5. Add new instance(s) to ELB & tag ○ status: in-use 6. Remove & tag instances ○ status: zombie

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Bootstrapping Ansible ./exec/ directory contains Jenkins entry points Ansible code lives in the repo it provisions. Publish it like an app.

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./exec/brochure-deploy.sh

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brochure-deploy.yml you are here. 00:00:10.888

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provision-new-ec2-instances brochure-deploy >

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identify-elb-AZs brochure-deploy > provision-new-ec2-instances >

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ec2-deploy brochure-deploy > provision-new-ec2-instances >

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AMI Hierarchy

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brochure-deploy.yml you are here. 00:01:18.415

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configure-instances brochure-deploy >

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roles/deploy/brochure/tasks/main.yml brochure-deploy > configure-instances

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brochure-deploy.yml you are here. 00:04:49.414

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brochure-deploy.yml you are here. 00:04:50.188

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find-instances-in-elb brochure-deploy >

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brochure-deploy.yml you are here. 00:04:50.911

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add-instances-to-elb brochure-deploy >

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brochure-deploy.yml you are here. 00:05:06.295

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decommission-instances brochure-deploy >

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brochure-deploy.yml you are here. 00:05:21.226

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EC2 INSTANCE

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● Predictable ● Repeatable ● Minimal Human Interaction ● Zero User Interruption ● Contained Failure Dream Delivery Achieved

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The Future ● Long Running Instances + Docker ○ Huge speed improvement ● Post Monolith, Abandon Jenkins? ○ Travis CI for Build/Test ○ Tower for Deployment Orchestration ● Ansible Galaxy?

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Questions? [email protected] @nonrational github.com/nonrational

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[email protected] All code snippets & diagrams contained in this presentation are property of Betterment, but please learn from them. All photographs / GIFs used in this presentation are someone else’s. Street Fighter, Back To The Future, Indiana Jones, Futurama, and Arrested Development are someone else’s property too.