Deploying to Kubernetes

And, deploying to Kubernetes
Containerizing a
REST
microservice
Ashley Roach – Cisco DevNet
Principal Engineer & Evangelist
@aroach

@aroach@CiscoDevNetdeveloper.cisco.com
About Me
• API & Cloud Evangelist
• 10+ Yrs Technical Product Mgmt
• Life-long, self-taught developer
• Denver, CO
• github.com/aroach & github.com/ciscodevnet
• Podcast: devtools.libsyn.com
• slideshare.net/aroach

DevNet Vision
Help developers build solutions
and grow their careers.
Learn Code Inspire

• §1: Why and What
• §2: REST API + Container
• §3: Deploying to Kubernetes

§1: Why and What

• Quickly build a REST API using Swagger
• How to containerize it
• How to deploy it
What is this guy talking about?

• It’s faster
• Saves you from writing boilerplate code
• Useful for mocking REST APIs
• More reliable deployment mechanism
Why build a REST API this way

§ 2: REST + Containers

Inspiration
• Created background “mini-hacks” activity at
sales conference
• Needed a way for them to submit answers
• Why not make them do it via an API?!

Infrastructure Architecture
DBaaS
CI/CD
Scheduler

Heart of the Matter

OpenAPI Spec (fka Swagger)
• Open specification for describing REST APIs
• A top-down approach where you would use
the Swagger Editor to create your Swagger definition
and then use the integrated Swagger Codegen tools to
generate server implementation.
• A bottom-up approach where you have an existing
REST API for which you want to create a Swagger
definition.

Swagger-node
• Runtime environment that includes Swagger Editor
• swagger project <command>
• Start
• Edit
• node app.js for proper deployments

Swagger Editor

Demo

Dockerfile
FROM node:5.11.1
# Create app directory
RUN mkdir -p /usr/src/app
# Establish where your CMD will execute
WORKDIR /usr/src/app
# Bundle app source into the container
COPY ./node_modules /usr/src/app/node_modules
COPY ./api /usr/src/app/api
COPY ./config /usr/src/app/config
COPY ./app.js /usr/src/app/
# Expose the port for the app
EXPOSE 10010
# Execute "node app.js"
CMD ["node", "app.js"]

Makefile
run:
docker run --rm --name $(NAME)-$(INSTANCE) $(LINK)
$(PORTS) $(VOLUMES) $(ENV) $(NS)/$(REPO):$(VERSION)
$ make run
$ docker run --rm --name swagger-default -p 8080:10010
ciscodevnet/rest-api-swagger:latest

§ 3: Kubernetes

• Container Orchestration
• Keeping your containers up, scaling them, routing
traffic to them
• Kubernetes != Docker though K8S uses Docker
(or CoreOS rkt)
What is Kubernetes?

• MiniKube (local workstation)
• Installers (on-prem, hybrid, custom)
• Kops (part of core kubernetes.io github)
• Kubespray (Ansible + Terraform)
• Etc, etc…
• Cloud
• Google Container Engine (GKE )
• Azure Container Service
• Etc…
Installation options

• Step-by-step tutorial of how to assemble a
kubernetes cluster
• https://github.com/kelseyhightower/kubernetes-
the-hard-way
Sidebar: K8S the hard way

Source: http://x-team.com/2016/07/introduction-kubernetes-architecture/

Infrastructure Architecture
Persistence
CI/CD
Kubernetes Registry

• Kubectl & ~/.kube/config
• Minikube CLI
• The Real Way™: CI system
Deploying Containers

K8S templates: deployment
# k8s/dev/api-deployment.yaml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: rest-api-swagger
spec:
replicas: 2
template:
metadata:
labels:
app: rest-api-swagger
spec:
containers:
- name: rest-api-swagger
image: ciscodevnet/rest-api-swagger:latest
ports:
- containerPort: 10010

K8S templates: service
# k8s/services/api-service-lb.yaml
kind: Service
apiVersion: v1
metadata:
name: rest-api-swagger
spec:
type: LoadBalancer # or NodePort, etc.
ports:
- name: http
port: 8080
targetPort: 10010
protocol: TCP
selector:
app: rest-api-swagger

Manual kubectl deployment
$ kubectl apply -f k8s/dev/api-deployment.yaml
$ kubectl apply -f k8s/services/api-service-lb.yaml
$ kubectl describe deployment
$ kubectl describe service rest-api-swagger
$ kubectl delete -f k8s/dev/api-deployment.yaml
$ kubectl delete -f k8s/services/api-service-lb.yaml

Drone CI kubectl deployment
deploy:
k8s:
image: containers.ex.com/devnet/drone-kubectl
apiserver: https://your-gke-api-endpoint #kubectl cluster-info
token: $$K8S_TOKEN
commands:
- 'kubectl apply -f k8s/services/*.yaml’
- 'kubectl apply -f k8s/dev/*.yaml --record’
- 'kubectl describe service ${SERVICE_NAME}’
when:
branch: master

Möar Demo

• Swagger-node provides fast REST API creation
• Prototyping, mocking
• Spec-first development was an adjustment
• Container-based workflows made deployment
super simple
Takeaways

Helpful Links
• https://communities.cisco.com/people/asroach/blog/2016/09/19/building-the-devnet-api-
scavenger-hunt
• https://communities.cisco.com/people/asroach/blog/2016/08/11/creating-a-cisco-spark-
membership-via-google-forms
• https://github.com/swagger-api/swagger-node
• https://github.com/CiscoDevNet/rest-api-swagger
• https://scotch.io/tutorials/authenticate-a-node-js-api-with-json-web-tokens
• http://blog.mongodb.org/post/32866457221/password-authentication-with-mongoose-part-1
• http://www.itnotes.de/docker/development/tools/2014/08/31/speed-up-your-docker-workflow-
with-a-makefile/
• http://sahatyalkabov.com/how-to-implement-password-reset-in-nodejs/
• https://marcqualie.com/2015/07/docker-dotenv

Thank you!

Deploying to Kubernetes

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