OpenShift overview- Suraj Deshmukh @surajd_

Introduction● OpenShift Origin is an application platform where developers and teams can

build, test, deploy, and run their applications.● Simply, OpenShift is open-source PAAS from Red Hat

Why OpenShift?● You don't have to waste time in setting up environment.● All you need to do is develop apps.● To make life easier add webhooks to Jenkins, Github, etc.● Provides a standard way for admins to resource monitoring, scaling,

application monitoring, performance, etc rather than spending time on setting up environment.

Architecture

Architecture● Docker and Kubernetes are core components of OpenShift.● Docker is core and Kubernetes is heart and kidney of OpenShift that keeps it

running.● OpenShift runs on top of Kubernetes cluster, with data stored in etcd.

Things OpenShift adds to Kubernetes● Source code management, builds, deployments.● Managing and promoting images using Source to Image (S2I) and Internal

Docker Registry.● OpenShift is more of developer facing and Kubernetes is more of operations

teams.● Dedicated web console● Team and User tracking for organizing a large developer organization.● App management at scale.

Contributions from RHT/OpenShift to Kubernetes

Benefits of OpenShift over orchestration providers● So when using Docker or Kubernetes directly you start with containerizing

your application i.e. build your own containers.

● But with OpenShift you don’t have to worry about it, OpenShift will build containers for you.

● But if you want to run your own containers you can do that as well.

Demo!● Building and deploying app on OpenShift● Hexboard App https://github.com/2015-Middleware-Keynote/hexboard

Source to Image● Source to Image, it downloads your code, detects the environment, builds the

code as a developer would do, on a base image specific to that environment, if build is successful the image is pushed to internal OpenShift registry.

● Enables rapid deployment.● Allows the underlying image to be up to date with somebody else managing it

for you.

OpenShift Router● It’s a point of contact for external world.● By default it is HAProxy based router, but OpenShift supports other routers as

well.● It looks at the host header of incoming traffic and depending on it, the traffic

will be assigned to particular service and service will then pass it to pods.● It can be deployed by cluster admin.

How do I get OpenShift?● RED HAT Container Development Kit http://developers.redhat.

com/products/cdk/download/● Atomic Developer Bundle https://github.com/projectatomic/adb-atomic-

developer-bundle/tree/master/components/centos/centos-openshift-setup

Try deploying apps yourself● Django application https://github.com/openshift/django-ex● NodeJS application https://github.com/ryanj/http-base and https://github.

com/openshift/nodejs-ex● php application https://github.com/openshift/cakephp-ex● Ruby application https://github.com/openshift/ruby-ex

Learning about OpenShift● OpenShift for Developers (free e-book)● OpenShift Docs● OpenShift Videos● Free Video Course: “New, no-cost course: Deploying Containerized

Applications” http://developers.redhat.com/blog/2016/02/11/new-no-cost-course-deploying-containerized-applications/

OpenShift offerings● OpenShift Origin - OpenSource upstream project.● OpenShift Online - A publicly hosted PAAS for individual developers or teams.● OpenShift Dedicated - Deploy, manage and support OpenShift instances

running on AWS.● OpenShift Enterprise - For organizations who want to deploy and manage

their OpenShift instances on their choice of on-premise hardware or certified cloud provider.

References● Red Hat Launches OpenShift Dedicated, Delivering its Container Application Platform as a Public Cloud Offering

https://www.redhat.com/en/about/press-releases/red-hat-launches-openshift-dedicated-delivering-its-container-application-platform-public-cloud-offering

● What Is the OpenShift Architecture? https://docs.openshift.org/latest/architecture/index.html● Red Hat’s contribution to Kubernetes http://www.slideshare.net/drettori/kube-12● OpenShift 3 Walkthrough https://www.youtube.com/watch?v=yFPYGeKwmpk● Using GitHub Webhooks on your local machine https://www.youtube.com/watch?v=--wNO4lV6WA● Docker, Kubernetes, OpenShift: Deploy, Scale, Build - Ryan Jarvinen https://www.youtube.com/watch?

v=jRzYv7KaZKo● S2I https://docs.openshift.com/enterprise/3.0/architecture/core_concepts/builds_and_image_streams.html#source-

build