Continuous Deliverywith OpenShift

Docker Meetup 31.5.2016

Thomas PhiliponaCTO

Agenda

1. OpenShift v3

2. CI / CD

3. Key Concepts

4. OpenShift CI /CD Pipeline with Jenkins

OpenShift v3

1

OpenShift v3

“next generation PaaS” OpenShift v3 by Red Hat

V3 new implementation based on « de facto » standard technologies

Based on reliable open source concepts

Docker Kubernetes

OpenShift v3

Container Platform as a Service (PaaS)

Multinode platform, Docker container runtime

Docker build platform

Docker registry

One platform runs it all!

Fancy CLI und GUI (self-service)

Container security enabled

Workflows● Docker build

● Prebuilt image

● Custom builder

● Source To Image

Workflow: Source To Image (S2I)

Git ?

s2i builder imageeg. openshift/ruby-22-centos7

code

code

My App

1.push code to git2. trigger webhook3.clone repo4.evaluate builder5.assemble image6.push to registry and deploy

12

3

4

5

MyApplicationMyApplication MyApp

6

Ruby, Java, PHP, NodeJs, ...

CI / CD

2

Continuous Integration

● SCM

● compile and test

● software integration

● reporting

● deployment to test environment

● extension of CI

● one artifact on all environments

● fully automated deployment with a single click

● prod release with a single click

● each release is deployed to production

● rolling deployments necessary

● blue - green deployments

Continuous Delivery Continuous Deployment

If It Hurts, Do It More Frequently, and Bring the Pain Forward

Source: Jez Humble, David Farley, Continuous Delivery, Pearson Education, Inc. 2011

CI / CD Workflow Overview

Git

code

Compile, Unit-tests

Integration Tests, Package

Deploy to Dev

Acceptance Tests

Deploy to UAT env

Manual Tests

Deploy to Prod

Key Concepts

3

Maven / ArtefactrepositoryMaven versioning doesn't work well with continuous delivery

Each commit is a potential release candidate SNAPSHOT versions do not exist

Maven release plugin is integrated into the Maven lifecycle. All or nothing

mvn release:prepare mvn release:perform→

Many releases artifactrepository clean up→

Rolling Updates

OpenShift supports rolling updates.

The application notifies the platform when it’s ready for requests.

The routing layer then forwards requests to the new containers.

Automated Database Migration

DB Migrationscripts are part of the deployed application and executed during startup.

$ php bin/console doctrine:schema:update

$ rake db:migrate

Automated Database Migration

Database knows the current schema version

During application startup / deployment lifecycle hook, the DB migration is executed

Rolling update

DB must be backward compatible

Concepts: Automated Database Migration

V41 V42 V43

dropColumn

dropColumn

dropTable

dropTable

MyApplicationMyApplication App

DB

Concepts: Automated Database Migration

App.v41 App.v42

... oldColumn newColumn ...

guild42 guild42

DB Trigger

OpenShift CI /CD Pipeline with Jenkins

4

Java Maven Example (1)

Git

code

Jenkins

code

Artefact Repo

artefact

checkout build release deploy

Jenkins

code

Jenkins

artefactcfg

+ Unit test+ Integration test+ Code analyse

Workflow: deploy

1.Jenkins buildmvn clean installtrigger build on OSE

2.custom builddownload artefactbuild docker image

3.deploy container

Jenkins

artifact

1 2

MyApplicationMyApplication MyApp

Custom builder image

3

My App

cfg

Java Maven Example (2)

acceptance tests

Jenkins

test

Jenkins

artefactcfg

deploy to UAT manual test

Jenkins

artefactcfg

deploy to Prod

Jenkins Pipeline Plugin

Build jobs written as Groovy scripts.

Build job script is next to source code in git repository

Jenkins provides the environment

● Git / Artifactory / OpenShift Accounts

https://wiki.jenkins-ci.org/display/JENKINS/Pipeline+Plugin

Example Build Script// Stage Checkout

stage 'Checkout'

git url: 'https://gitlab.puzzle.ch/tphilipona/appuio-javaee-example.git'

// Stage Build

stage 'Build'

sh "${mvnHome}/bin/mvn clean install"

Stage View

Conclusion

5

Key Factors: Automation and Fast Feedback

Customer,PO Dev Production

DeploymentIdea, Feature, Bug

Fast, qualified Feedback

Resources

https://docs.openshift.com

Q & A

01.6.2016 in BE15.6.2016 in ZH

Free APPUiO OpenShift Techlab

Thank You!