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Continuous Integration (CI)• Nikko Noel Balde

• 10-02-2016

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Topic Outline

• Why do we need CI?

• Introduction to CI

• A Typical CI Workflow

• CI Practices

• Jenkins: A CI Server

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Why do we need CI?

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Introduction to CI

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Eliminate blind spots so you can build and deliver software more rapidly.

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Continuous Integration (CI)

“Continuous Integration (CI) is a

development practice that requires

developers to integrate code into a

shared repository several times a day.

Each check-in is then verified by an

automated build, allowing teams to

detect problems early.”

“By integrating regularly, you can

detect errors quickly, and locate them

more easily.”

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Minimize the

duration and effort

required by "each"

integration

What does CI tries to achieve?

Be able to deliver

"at any moment“ a

product version

suitable for release

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What CI brings to an Organization

Say goodbye to long and tense integrations

Increase visibility which enables greater communication

Catch issues fast

Spend less time debugging and more time adding features

Proceed in the confidence you’re building on a solid foundation

Stop waiting to find out if your code’s going to work

Reduce integration problems allowing you to deliver software more rapidly

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What Prevents Teams from using CI

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Increased overhead in maintaining

the CI system

Additional hardware/software

costs

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A Typical CI Workflow

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Continuous Integration (CI)

Continuous

• Technically, continuous means

something that once started, never

stops.

• Continuous in the concept of CI is

more like continual.

Integration

• The act of combining separate

source code artifacts to determine

how they work as a whole.

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CI Practices

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CI PracticesSingle Source Point

Use a Version Control

System

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MAINLINE

A single branch of the project

currently under development.

(trunk, master, etc.)

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CI PracticesAutomated Build Scripts

Automate the Build

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BUILD

A set of activities performed to

generate, test, inspect, and deploy

software.

BUILD SCRIPT

A single script, or set of scripts, you

use to compile, test, inspect, and

deploy software

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CI PracticesSelf-Testing Code

Create tests for your

code

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CI PracticesFrequent Commits

Everyone should

commit code as

regularly as possible

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BULD

A set of activities performed to

generate, test, inspect, and deploy

software.

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CI PracticesIntegration Build Machine

Every Commit Should

Build the Mainline on

a Separate Integration

Build Machine

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BULD

A set of activities performed to

generate, test, inspect, and deploy

software.

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CI PracticesAlways have a Stable Base

Fix Broken Builds

Immediately

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CI PracticesRapid Feedback

Keep the Builds Fast

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CI PracticesEasily Accessible Software

Make it Easy for

Anyone to Get the

Latest Executable

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CI PracticesStatus Visibility

Everyone should be

able to see Results of

the Latest Build

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CI PracticesDon’t…

Don’t commit broken

code!

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Don’t commit untested

code!

Don’t commit when

the build is broken!

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Jenkins: A CI Server

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Runs an integration build whenever a change is committed to the version control

repository.

Recommended, but not necessarily required for CI

Examples: CruiseControl, Jenkins

CI Server

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• Open source Continuous Integration server written in

Java

• Has a simple configuration through a web-based

GUI, which speeds up Job creation, improves

consistency, and decreases the maintenance costs

• Is a master slave topology that distributes the build

and testing effort over slave servers with the results

automatically accumulated on the master

• Vastly extendable through plugins, with over 400

plugins available

JenkinsA CI Server

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To have a look and feel of Jenkins, go to:

https://ci.jenkins-ci.org/

JenkinsDemo

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• Continuous Integration: Improving Software Quality and Reducing Risk

By: Paul Duvall

• Jenkins Continuous Integration Cookbook

By: Alan Mark Berg

• Continuous Integration

http://en.wikipedia.org/wiki/Continuous_integration

• Jenkins

http://jenkins-ci.org/

References