12 Factor AppBest Practices for JVM Deployment

12 Factor AppBest Practices for JVM Deployment

Java doesn’t suck when you do things this way

XML sucks

10 page wikis to set up your app suck

Incongruent environments suck

DEV ≠ PROD

Apps that take more than 30 seconds to start up suck

Recompiling your entire codebase after fixing a typo sucks

Monolithic apps suck

The Java language sucks

But Java doesn’t suck

What does modern Javadevelopment look like?

Joe Kutner@codefinger

JVM Languages Owner@Heroku

Joe Kutner

12 Factor Appa methodology

ScalabilityMaintainability

Portability

12 Factor Appa methodology

ContinuousDelivery

12 Factor Appa methodology

Sleepingat

Night

Continuous Delivery

Slee

p

The 12 Factors• Codebase

• Dependencies

• Config

• Backing services

• Build, release, run

• Processes

• Port binding

• Concurrency

• Disposability

• Dev/prod parity

• Logs

• Admin processes

The 12 Factors• Codebase

• Dependencies

• Config

• Backing services

• Build, release, run

• Processes

• Port binding

• Concurrency

• Disposability

• Dev/prod parity

• Logs

• Admin processes

Graceful shutdown

Quick startup

Resilience to failure

| Disposability |

| Disposability |

Application Servers are not disposable

Application Servers are not disposable

| Disposability |

| Disposability |

Microservices are disposable

| Disposability |

Easy to replace

Decoupled from external infrastructure

Easy to modify

| Disposability |

Microservices

JavaGroovy

ScalaClojure

Scala Scala

Standalone ➤ Disposable

| Disposability |

Bootable ➤ Disposable

| Disposability |

The 12 Factors• Codebase

• Dependencies

• Config

• Backing services

• Build, release, run

• Processes

• Port binding

• Concurrency

• Disposability

• Dev/prod parity

• Logs

• Admin processes

dev

sqlite

postgres

stage

mysql

postgres

prod

postgres

postgres

=

≠

=

=

≠

=

| Disposable | Parity |

dev

jetty

jetty

stage

tomcat

jetty

prod

jboss

jetty

=

≠

=

=

≠

=

| Disposable | Parity |

| Disposable | Parity |

dev

jetty

{}

stage

tomcat

{}

prod

jboss

{}

=

≠

=

=

≠

=

.war

Traditional JVM Deployment

.jar

Modern JVM Deployment

Reproducible ➤ Parity

| Disposable | Parity |

Reproducible ➤ Disposable

| Disposable | Parity |

The 12 Factors• Codebase

• Dependencies

• Config

• Backing services

• Build, release, run

• Processes

• Port binding

• Concurrency

• Disposability

• Dev/prod parity

• Logs

• Admin processes

Configuration belongs in the environment, not in the application

Configuration should be strictly separated from code

| Disposable | Parity | Config |

Linux

Tomcat

WAR

server.xml

context.xml

web.xml

/etc/...

| Disposable | Parity | Config |

Environment

Java Application

PATH

DATABASE_URL

AWS_ACCESS_TOKEN

JAVA_OPTS

| Disposable | Parity | Config |

Containerless ➤ Separation

| Disposable | Parity | Config |

Containerless ➤ Parity

| Disposable | Parity | Config |

Containerless ➤ Disposable

| Disposable | Parity | Config |

Containerless ➤ 12 Factor App

| Disposable | Parity | Config |

Containerless Containerless Containerless

| Disposable | Parity | Config |

Dropwizard

@Configuration@EnableAutoConfiguration@ComponentScanpublic class Main { public static void main(String[] args) { SpringApplication.run(Main.class, args); }}

import org.eclipse.jetty.server.Server;import org.eclipse.jetty.servlet.*;

public class Main { public static void main(String[] args) throws Exception { Server server = new Server(); ServletContextHandler context = new ServletContextHandler( ServletContextHandler.SESSIONS); context.setContextPath("/"); server.setHandler(context); context.addServlet(new ServletHolder(new App()), "/*"); server.start(); server.join(); }}

(defn -main [& [port]] (jetty/run-jetty (site #'app) {:port port :join? false}))

// Play example does not require any code

The 12 Factors• Codebase

• Dependencies

• Config

• Backing services

• Build, release, run

• Processes

• Port binding

• Concurrency

• Disposability

• Dev/prod parity

• Logs

• Admin processes

| Disposable | Parity | Config | Concurrency |

Scale Up

Scale Out

| Disposable | Parity | Config | Concurrency |

web.1

web.2

worker.1 clock.1

Workload Diversity

Num

ber o

f Pro

cess

es

worker.2

worker.3

The 12 Factors• Codebase

• Dependencies

• Config

• Backing services

• Build, release, run

• Processes

• Port binding

• Concurrency

• Disposability

• Dev/prod parity

• Logs

• Admin processes

| Disposable | Parity | Config | Concurrency | Admin |

Admin tasks should be run in isolated processes

web1

web2

web3

admin

| Disposable | Parity | Config | Concurrency | Admin |

The 12 Factors• Codebase

• Dependencies

• Config

• Backing services

• Build, release, run

• Processes

• Port binding

• Concurrency

• Disposability

• Dev/prod parity

• Logs

• Admin processes

TODOList

Install the JDK

Three Steps to Setup Your App

Clone the SCM repo

Run the app

Get it under 30 seconds

Time your app’s startup

Get a stopwatch

Make Your App Startup Quick

Deploy or Scale Your App in One Step

Handle requests

Deploy the app

Provision a new environment

http://12factor.net

Java Doesn’t Suck

Java Doesn’t Suck(if you use it the right way)

Joe Kutner@codefinger

JVM Languages Owner@Heroku

http://www.slideshare.net/jkutner/jdays-2015