This document discusses how Groovy fits into various roles in cloud computing. It begins with an introduction to the author and their background in cloud and DevOps tooling. It then outlines how Groovy can be used for microservices with Ratpack, immutable infrastructure, packaging with Gradle, automating builds with Jenkins, managing cloud infrastructure with Spinnaker, automating server tasks with Groovy scripts and SSH, and more. The document also advertises an upcoming talk covering these topics in more detail.

1. Groovy in the Cloud
Dan Woods
@danveloper
Code: h(ps://github.com/danveloper/groovy-in-the-cloud

2. Senior So(ware
Engineer
Working on Cloud &
DevOps Tooling

3. Wrote some of this while at Ne0lix
h"ps://spinnaker.io

4. O'Reilly Author,
2016
Learning Ratpack

5. Support your community.
All royal(es for Learning Ratpack go directly to Gr8Ladies
h"p://gr8ladies.org

6. How does Groovy fit in the cloud?

7. Groovy is present at every layer of
your project's lifecycle.

8. Microservices: Groovy community
has a lot to offer.

9. Build and packaging: Gradle is the
best, most flexible build tool.

10. Automa'ng and ensuring builds:
Groovy + Jenkins = !.

11. Managing cloud infrastructure:
Spinnaker

12. Automa'ng server tasks: Groovy
scripts + sshoogr!

13. At the end of the day, Groovy is
Java, so anything Java can do,
Groovy can do -- and simpler!

14. Groovy can act in mu.ple roles: as a powerful, dynamic scrip.ng
tool or as a fully compiled programming language.

15. Groovy can also be sta/cally compiled!

16. Agenda
• Groovy microservices with Ratpack
• Immutable infrastructure
• Gradle OS Package Plugin
• Gradle + Docker
• sshoogr
• Jenkins Job DSL
• Spinnaker

17. Microservices with Groovy and Ratpack
@Grab('io.ratpack:ratpack-groovy:1.4.0-rc-1')
import static ratpack.groovy.Groovy.ratpack
import static ratpack.jackson.Jackson.json
ratpack {
handlers {
get {
render(json([message: "Hello World!"]))
}
}
}

18. Immutable Infrastructure
The process by which a new server image is created for every new
version of your code.

20. Gradle OS Package Plugin
buildscript {
repositories {
jcenter()
maven {
url "https://plugins.gradle.org/m2/"
}
}
dependencies {
classpath 'io.ratpack:ratpack-gradle:1.4.0-rc-1'
classpath 'gradle.plugin.com.netflix.nebula:gradle-ospackage-plugin:3.6.1'
}
}
apply plugin: 'io.ratpack.ratpack-groovy'
apply plugin: 'nebula.ospackage'
version = "1.0.0"
repositories {
jcenter()
}
ospackage {
// ...
}
buildDeb {
// ...
}

21. Gradle OS Package Plugin
ospackage {
packageName = "myapp"
release '3'
into "/opt/myapp"
from "${project.buildDir}/install/${project.applicationName}"
from("osfiles") { into "/" }
}
buildDeb {
dependsOn installDist
//requires("nginx")
//requires("mysql-client")
preInstall file("scripts/preInstall.sh")
postInstall file("scripts/postInstall.sh")
}

22. Gradle Docker Plugin
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'io.ratpack:ratpack-gradle:1.4.0-rc-1'
classpath 'com.bmuschko:gradle-docker-plugin:3.0.1'
}
}
apply plugin: 'io.ratpack.ratpack-groovy'
apply plugin: 'com.bmuschko.docker-remote-api'
apply plugin: 'com.bmuschko.docker-java-application'
version = "1.0.0"
repositories {
jcenter()
}
docker {
javaApplication {
maintainer = 'Dan Woods "daniel.p.woods@gmail.com"'
}
}

23. Gradle Docker Plugin - Build Image
$ ./gradlew dockerBuildImage
:compileJava UP-TO-DATE
:compileGroovy UP-TO-DATE
:processResources UP-TO-DATE
:classes UP-TO-DATE
:jar UP-TO-DATE
:startScripts UP-TO-DATE
:distTar UP-TO-DATE
:dockerCopyDistResources UP-TO-DATE
:dockerDistTar
:dockerBuildImage
Building image using context '/Users/danw/Documents/uberconf-2016/groovy-cloud-code/docker-plugin/build/docker'.
Using tag 'docker-plugin:1.0.0' for image.
Step 1 : FROM java
---> 264282a59a95
Step 2 : MAINTAINER Dan Woods "daniel.p.woods@gmail.com"
---> Using cache
---> 46c65408f762
Step 3 : ADD docker-plugin-1.0.0.tar /
---> Using cache
---> 41dc34567fae
Step 4 : ENTRYPOINT /docker-plugin-1.0.0/bin/docker-plugin
---> Using cache
---> fad9ba971b19
Step 5 : EXPOSE 5050
---> Running in 0bd76fcb5e15
---> 43b2d30640e2
Removing intermediate container 0bd76fcb5e15
Successfully built 43b2d30640e2
Created image with ID '43b2d30640e2'.
BUILD SUCCESSFUL
Total time: 10.974 secs

24. Serverless Compu-ng
No persistent server, quick func2ons that do one single thing very well

25. Serverless is a great choice for super lightweight microservices that
ingest some data, process it, and respond quickly.

26. AWS Lambda
h"ps://aws.amazon.com/lambda/

27. Groovy Lambda Demo

28. sshoogr
@Grab('com.aestasit.infrastructure.sshoogr:sshoogr:0.9.25')
import com.aestasit.infrastructure.ssh.dsl.*
import com.aestasit.infrastructure.ssh.*
def engine = new SshDslEngine(new SshOptions(defaultKeyFile: new File("/Users/danw/Downloads/uberconf.pem"), trustUnknownHosts: true))
engine.remoteSession('ubuntu@xxx:22') {
exec 'rm -rf /tmp/key*'
remoteFile('/tmp/key.foo').text = "mySecretKey=123456"
}

29. sshoogr Demo

30. Jenkins Job DSL
h"ps://github.com/jenkinsci/job-dsl-plugin

31. Provides a means to describe your
Jenkins Jobs

32. Allows your build configura2ons to
be under source control

33. Ensures that if your Jenkins CI
system crashes, you can quickly and
safely recover

34. Wri$en in Groovy, so you can do
any programma5c processing you
want when configuring your builds!

35. Jenkins Job DSL
def gitUrl = 'git://github.com/myorg/myapp.git'
def allowedUsers = ['dan', 'ben', 'ernest']
job('PROJ-build') {
scm {
git(gitUrl)
}
// no trigger
authorization {
allowedUsers.each { user ->
permission('hudson.model.Item.Build', user)
}
}
steps {
shell('gradlew clean build')
}
}

36. Spinnaker

37. Con$nuous delivery/deployment
pla4orm from Ne4lix

38. Wri$en in Groovy with Spring Boot

39. Highly extensible pla0orm for
managing your cloud footprint

42. Easy to build plugins and adjust
na1ve func1onality by incorpora1ng
Groovy modules

43. Ques%ons?