CI/CD with Kubernetes,
Helm & Wercker
#madScalability
Madrid
30/11/2016

About me:
Javier Cuevas
@javier_dev
AIRBNB FOR DOGS
“MAJESTIC” RAILS 3.2 MONOLITH
RUBY ON RAILS SHOP
WHO EMBRACED ELIXIR
previously now full time!

First things first:
My review of the new
MacBook Pro with Touch Bar:
Meh 😔

Disclaimers
1. I learned Docker while learning
Kubernetes. I ain’t no expert.
2. Gudog is not at unicorn scale.
We’re just at dog scale.

NOW LET’S
GET STARTED

A LOOK BACK
TO DEVOPS
@ Gudog

Hosting / Cloud Provisioning
Continuos
Integration
Deployments
2013 DigitalOcean SSH all the things 🙀 Jenkins Capistrano
2014 AWS EC2 Rubber Shippable Capistrano
2015 AWS EC2 (OpsWorks) Chef (OpsWorks) Shippable Chef (OpsWorks)
2016
Google Container Engine
(GKE)
Kubernetes 💙 Wercker Kubernetes + Helm

Why we chose
Google Cloud
😱 Because we ran out of AWS credits and
we got new credits for Google Cloud.
💸 Because (now that we’re paying for it) is
cheaper than AWS.
👌 Because it has the best integration
available with Kubernetes.

Why we chose
Kubernetes
' Because the guy from Google Cloud
told us it was super cool.
🤔 Because we had no idea what that
Docker thing was about and we were
wondering.

Why we chose
Wercker
🚀 Because it was way faster than Shippable
running our Slow Rails Test Suite™ .
🤑 Because, as Shippable, it’s free.
✨ Because the UX/UI is so pretty.

KUBERNETES 101
(IN 3 MINS)

What is Kubernetes?
• Open-source system for container
orchestration and more.
• Works with many cloud providers
(Google Cloud, AWS, etc.) and bare
metal.

Basic Kubernetes concepts
• Node: a VM or bare metal machine running
Kubernetes.
• Cluster: a bunch of nodes.
• Pod: a group of one or more containers.
• Deployment: defines how many replicas of a Pod
you want and how to perform updates (deploys).
• Service: exposes some pods in a given port.

More about Kubernetes
https://www.youtube.com/watch?v=K_Kh4LMiiqQ

HOW WE USE
KUBERNETES

Worker Deployment
…
Web
Service
DB
Service
Redis
Service
Memcached
Service
Memcached Deployment
Memcached Pod
memcached
Worker Pod
resque
Worker Pod
resque
Web Deployment
…Web Pod
nginx + unicorn
Web Pod
nginx + unicorn
Cron Deployment
Cron Pod
cron -f
Redis Deployment
Redis Pod
redis
DB Deployment
DB Pod
postgres
Web
Ingress
☁Internet

HELM 101
(IN 3 MINS)

What is Helm?
• It’s a package manager for Kubernetes 🤔
• Charts are packages of pre-configured Kubernetes
resources.
• You can use public Charts to easily install apps
into your cluster (eg: postgresql, wordpress).
• … Or you can create a private Chart for your
application.

What is Helm?
• You can use templates to define your Charts 🙌
• Helm has two parts:
- helm: a CLI client
- tiller: A server (tiller) than runs in your Kubernetes
cluster as another pod. You can install tiller in your
cluster with: $ helm init

More about Helm
https://www.youtube.com/watch?v=zBc1goRfk3k
https://speakerdeck.com/michellen/delivering-kubernetes-applications-with-helm

HOW WE USE
HELM

File structure & code
!"" app
!"" config
!"" db
!"" deploy
!"" lib
!"" log
!"" public
!"" script
!"" spec
!"" vendor
!"" Gemfile
!"" Gemfile.lock
!"" Procfile
!"" Rakefile
!"" config.ru
#"" wercker.yml
deploy
!"" kubernetes-chart
$ !"" templates
$ $ !"" _helpers.tpl
$ $ !"" cron.yaml
$ $ !"" db.yaml
$ $ !"" memcached.yaml
$ $ !"" redis.yaml
$ $ !"" secrets.yaml
$ $ !"" web.yaml
$ $ #"" worker.yaml
$ !"" Chart.yaml
$ !"" README.md
$ !"" production-values.yaml
$ !"" rails_env.yaml
$ !"" staging-values.yaml
$ #"" values.yaml
!"" nginx.conf
#"" unicorn.rb
https://gist.github.com/javiercr/fa4335e6bc67147b1e12523b0282a18a

WERCKER 101
(IN 3 MINS)

What is Wercker?
• It’s a Docker-Native CI/CD Automation platform for
Kubernetes & Microservice Deployments.
• With Wercker you define your CI/CD process as
Workflow composed by multiple Pipelines.
• Each Pipeline is defined by multiple Steps.
Wercker offers a Registry of shared steps
(eg: to install kubectl)

HOW WE USE
WERCKER

install nodejs, phantomjs
bundle install
rake db:create
rspec
install nodejs, nginx, cron
copy nginx.conf
copy unicorn.rb
bundle install
rake assets:precompile
hipchat notification
install kubectl
install helm
helm upgrade
hipchat notification
build
build-container
deploy-staging
Gudog’s Wercker Workflow
note that we decided to only automate deployments to staging. env.
however deploying to production it’s just one click
(executing the deploy-production pipeline from wercker ui)
docker push to GCR

Gudog’s Wercker Workflow
Our wercker.yml:
https://gist.github.com/javiercr/fa4335e6bc67147b1e12523b0282a18a#file-wercker-yml

http://blog.wercker.com/Dockerfiles-considered-harmful

THANK YOU
Questions?
Special thanks to @LachlanEvenson from Deis
for helping me get started with Helm and the k8s community.