Kubernetes and OpenShift For JavaScript Developers Jan Kleinert jan.kleinert@redhat.com March 8, 2019

@jankleinert 2 Jan Kleinert Developer Advocate, Red Hat twitter/github: @jankleinert Hello!

@jankleinert 3 What is Kubernetes and why do we need it? 4 basic resource types What is OpenShift? Build, automate, iterate, collaborate What we’ll cover

@jankleinert 4 What app are we deploying?

@jankleinert Why do we need Kubernetes? 5

@jankleinert 6 What is Kubernetes?

@jankleinert 7 Kubernetes is... An open source platform for running container-based workloads and managing them at scale

@jankleinert 8 Kubernetes provides... An API API object primitives include these attributes: kind apiVersion metadata spec status

@jankleinert 9 Basic K8s Terminology 1. node 2. pod 3. service 4. deployment

@jankleinert 10 Node ● Node: a host machine where containerized processes run ● Node activity is managed via one or more Master instances

@jankleinert 11 Pod ● A group of one or more co-located containers ● Minimum unit of scale kind: Pod apiVersion: v1 metadata: creationTimestamp: name: hello-k8s labels: run: hello-k8s spec: containers: - name: hello-k8s image: jkleinert/raleigh-dogparks:v1 ports: - containerPort: 8080 resources: {}

@jankleinert 12 https://youtu.be/E7KWcvuFVns

@jankleinert 13 Service ● Acts as a single endpoint for a collection of replicated pods ● Like a load balancer kind: Service apiVersion: v1 metadata: name: hello-k8s creationTimestamp: labels: run: hello-k8s spec: ports: - protocol: TCP port: 8080 targetPort: 8080 selector: run: hello-k8s type: LoadBalancer status: loadBalancer: {}

@jankleinert 14 https://youtu.be/mkLNa_5w_58

@jankleinert 15 Deployment ● Helps you specify container runtime requirements (in terms of pods) kind: Deployment
 apiVersion: apps/v1beta1
 metadata:
 name: hello-k8s
 creationTimestamp: 
 labels:
 run: hello-k8s
 spec:
 replicas: 1
 selector:
 matchLabels:
 run: hello-k8s
 template:
 metadata:
 creationTimestamp: 
 labels:
 run: hello-k8s
 spec:
 containers:
 - name: hello-k8s
 image: jkleinert/raleigh-dogparks:v1
 resources: {}
 strategy: {}
 status: {}

@jankleinert 16 https://youtu.be/1gjTeR4tsj0

@jankleinert 17 https://youtu.be/V8BOQhmC30w

@jankleinert 18 https://youtu.be/C8xAqfFaSLI

@jankleinert 19 https://youtu.be/YEkIAWFc9WE

@jankleinert 20 What is OpenShift?

@jankleinert 21 Build Build and deploy container images

@jankleinert 22 Source to Image Combines source repos and operationally- maintained builder images to produce application images

@jankleinert 23 Source to Image Available as a standalone project, for use with Jenkins or other external builder processes: github.com/openshift/source-to-image

@jankleinert 24 Automate git push to deploy

@jankleinert 25 Iterate

@jankleinert 26 oc rsync Useful for testing changes prior to a commit Copies files to a container; use the --watch flag to continuously sync oc rsync --exclude='node_modules*' . YOUR_PODNAME:


@jankleinert 27 odo (OpenShift Do) A developer-focused command line tool for fast, iterative development on OpenShift https://github.com/redhat-developer/odo https://learn.openshift.com/introduction/developing-with-odo/

@jankleinert 28 Collaborate Share and replicate your success

@jankleinert 29 Service Catalog & Brokers

@jankleinert 30 Templates as Installers Install a template into the current project, making it easier to reuse: oc create -f template.json


@jankleinert 31 Templates as Installers Create an application from an installed template, from a file, or from a URL: oc new-app -f template.json


@jankleinert 32 Multi-service App Example Node.js and MongoDB multi-service app oc create -f https://raw.githubusercontent.com/ openshift-roadshow/nationalparks-js/master/ nationalparks-js.json

@jankleinert 33 Kubernetes By Example: http://kubernetesbyexample.com Interactive Learning Portal: https://learn.openshift.com Backend repo: https://github.com/jankleinert/k8s-visualizer-backend Frontend repo: https://github.com/jankleinert/k8s-visualizer-frontend Raleigh dog parks repo: https://github.com/jankleinert/raleigh-dogparks Resources

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