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Twelve-factor applications

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• How to design, develop, deploy, and manage an IBM Bluemix PaaS application by following the Twelve-Factor App methodology: (http://12factor.net/)

– Codebase

– Dependencies

– Config

– Backing Services

– Build, release, run

– Processes

– Port binding

– Concurrency

– Disposability

– Dev/prod parity

– Logs

– Admin processes

After you complete this section, you should understand:

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Twelve-factor methodology

• In the modern era, software is commonly delivered as a service:

called web apps, or software-as-a-service.

• By using twelve-factor methodology, you can write apps in any

programming language and use any combination of backing

services (database, queue, memory cache, etc.)

Source: http://www.12factor.net

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The twelve factors

1. Codebase - One codebase tracked in revision control, many deploys

2. Dependencies - Explicitly declare and isolate dependencies

3. Config - Store configuration in the environment

4. Backing Services - Treat backing services as attached resources

5. Build, release, run - Strictly separate build and run stages

6. Processes - Execute the app as one or more stateless processes

7. Port binding - Export services via port binding

8. Concurrency - Scale out via the process model

9. Disposability - Maximize robustness with fast startup and graceful shutdown

10.Dev/prod parity - Keep development, staging, and production as similar as

possible

11.Logs - Treat logs as event streams

12.Admin processes - Run administration and management tasks as one-off

processes

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Twelve factor and Bluemix: 1.Codebase

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Codebase: Bluemix DevOps Services

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Twelve factor and Bluemix: 2. Dependencies

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Dependencies

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Twelve factor and Bluemix: 3.Config

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Config

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Twelve factor and Bluemix: 4.Backing Services

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Backing Services

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Twelve factor and Bluemix: 5.Build, Release, Run

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Build, Release, Run

CF Buildpacks + immutable Warden Containers

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Twelve actor and Bluemix: 6.Processes

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Processes

Stateless:

CF Warden Containers: no clustered memory, no shared FS

Desired State

ActualState

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Twelve factor and Bluemix: 7.Port Binding

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Twelve factor and Bluemix: 8.Concurrency

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Concurrency

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Twelve factor and Bluemix: 9.Disposability

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Twelve factor and Bluemix: 10.Dev/Prod parity

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Twelve factor and Bluemix: 11.Logs

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Logs

Messaging

ThirdParty

(Logstash,Splunk)

Bluemix Elastic Runtime

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Health Manager

Cloud Controller

Messaging

Syslog

Aggregator

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Twelve factor and Bluemix: 12.Admin Processes

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