Deploying Java and Play!

Apps on Heroku

Sandeep Bhanot

@cloudysan

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Once upon a time….

Tim wanted to develop a Java app……

So he got to work….

• Acquire and provision all the H/W (Servers, Load Balancers, Routers etc.)

• Install, configure and tune the entire S/W stack (OS, Web/App Server, DB etc.)

• Configure env. for Application services like Routing, Clustering, Load Balancing,

• Patch and upgrade the H/W and S/W stack

Cost

DR, Caching, DB Replication etc ($$$)

Agility

One day….

Tim decided to try this ‘Cloud’ thingy……

So he tried an IAAS provider…. • NO H/W to buy/install/configure!

• Still has to configure and tune the entire S/W stack (OS, Web/App Server, DB etc.)

• Still has to configure (and sometime code) env. for Application services like

• Patch and upgrade the S/W stack

Scaling, Routing, Clustering, Load Balancing, DR, DB replication etc

Cost

Agility

Finally….

Tim heard of Heroku

When Tim met Heroku…. • NO Servers

• Managed S/W stack (OS, Web/App Server, DB etc.)

• Application services like Routing, Load Balancing and DR built-in

• Elastic scaling

• git push heroku master

Focus on your Code. Period.

Cost

Agility

Heroku = Polyglot Cloud Platform

402,550+ Apps Running on Heroku

$ heroku create –s cedar

$ git push heroku master

Create more web processes:

$ heroku scale web=2

What processes are running:

$ heroku ps

Check the logs:

$ heroku logs

View releases:

$ heroku releases

Rollback:

$ heroku rollback

Run a process:

$ heroku run "your bash command"

Environment (Runtime, configuration, etc)

Ingredients (Dependencies, app, services, etc)

Process (Build, assemble, start, etc)

Environment + Ingredients + Process = web 1!

Environment + Ingredients + Process = web 2!

Deploying web apps...

$ heroku config

DATABASE_URL = postgres://blah:blah@ec2.compute-1.amazonaws.com/blah

JAVA_OPTS = -Xmx384m -Xss256k -XX:+UseCompressedOops

MAVEN_OPTS = -Xmx384m -Xss256k -XX:+UseCompressedOops

PATH = .maven/bin:/usr/local/bin:/usr/bin:/bin

REDISTOGO_URL = redis://redistogo:1234asdf@angler.redistogo.com:9291/

REPO = /app/.m2/repository

Externalize Environment Variables

Ingredients defined (pom.xml)

<dependency> <groupId>org.eclipse.jetty</groupId> <artifactId>jetty-webapp</artifactId> <version>${jetty.version}</version> </dependency> <dependency> <groupId>org.mortbay.jetty</groupId> <artifactId>jsp-2.1-glassfish</artifactId> <version>2.1.v20100127</version> </dependency> <dependency> <groupId>postgresql</groupId> <artifactId>postgresql</artifactId> <version>9.0-801.jdbc4</version> </dependency>

web: sh target/bin/webapp

Process defined (Maven + Procfile)

Don't Share-Something

Move state to the isolated & independent edges

- UI state -> client

- Permanent state -> external data stores

Share-Nothing

Deploy an app on Heroku

1. Create a Java Web App

2. Add a Procfile

3. Commit to a git repo

4. Create an app on Heroku

5. “git push” to Heroku

6. Scale and monitor on Heroku

Connect to a Database

• Free shared PostgreSQL DB

• Dedicated & managed PostgreSQL DB

• Amazon RDS MySQL & Oracle

• NoSQL Add-ons (Redis, MongoDB, etc)

• Database.com

• Or do your own thing

Heroku: postgres://[username]:[password]@[server]/[db-name]

JDBC: jdbc:postgresql://[server]/[db-name]?user=[username]&password=[password]

Transform: dbUrl = dbUrl.replaceAll("postgres://(.*):(.*)@(.*)",

"jdbc:postgresql://$3?user=$1&password=$2");

Transform DATABASE_URL

Create a Worker Process

1. Create a process

2. Update the Procfile

3. Push to Heroku

4. Scale the workers

Using a Heroku Add-on

• Find an Add-on: http://addons.heroku.com

• Activate the Add-on

• Use the service

• Push to Heroku

Play!

• A Java framework for Web Applications

• Non Servlet or JEE based

• A full stack framework

• Focuses on productivity and fun

Play! on Heroku

1. Create Play app

2. Add app to git repo

3. Create app on Heroku

4. Push app to Heroku

750 free dyno hours

per month per app

heroku.com/java

github.com/heroku/java-workbook

@cloudysan