Spring Boot is the defacto framework for building microservices with Java. These slides walk you though how to get started, deploy and debug, perform service discovery and do canary deployments with Spring Boot apps on OpenShift

1. 1
@kamesh_sampath kamesh.sampath@hotmail.com
bit.ly/springboot-on-openshift

2. developers.redhat.com

3. Who am I ?
● Active Open Source Contributor
● Creator vert.x-maven-plugin →
https://vmp.fabric8.io/
● Contributor fabric8 platform → https://fabric8.io/
kameshsampath
Kamesh Sampath
Director of Developer Experience at Red Hat
@kamesh_sampath
ksampath@hotmail.com

4. The microservice architectural style is an approach to developing a single application as a
suite of small services, each running in its own process and communicating with lightweight
mechanisms, often an HTTP resource API.
These services are built around business capabilities and independently deployable by fully
automated deployment machinery. There is a bare minimum of centralized management of
these services, which may be written in different programming languages and use different
data storage technologies.
Martin Fowler
What is a microservice ?

5. Microservices Properties
MyService
Monitoring
Tracing
Discovery
API
Invocation
Resilience
Pipeline
Authentication
Logging Elasticity

6. Short History of Microservices
Continuous
Integration
via XP
1999
AWS EC2
2006
DropWizard
May 2011
Agile
Manifesto
Feb
2001
NETFLIX
to AWS
2010
Ribbon
March 2012
Hystrix
March 2012
Eureka
July 2012
Microservices
Access
Thoughtworks
Radar
March 2012
Spring Boot
Sept 2013
Microservices
Defined
Thoughtworks
Fowler, Lewis
March 2014
Kubernetes
June 2014
Java EE6
2009
DevOps
2009
Containers
Docker
2013

7. java -jar myapp.jar
DropWizard
www.dropwizard.io
JAX-RS API
First to market
DropWizard Metrics
Embeddable
servers:
Jetty
Spring Boot
projects.spring.io/spring-
boot
Spring API
(@RestController)
‘Starter’ POMs:
start.spring.io
Embeddable servers:
Tomcat, Jetty, Undertow
WildFly Swarm
wildfly-swarm.io
Java EE 7 APIs
‘Starter’ POMs:
wildfly-
swarm.io/generator
Embeddable
servers:
WildFly (Undertow)
Vert.x
vertx.io
Reactive
Async/non-blocking
vertx run myhttp.java
HTTP, HTTP/2, TCP,
UDP, Websockets,
etc. (out of the box)

8. @kamesh_sampath
Java Microservices Platform circa 2014
Config Server
NETFLIX Ribbon

9. @kamesh_sampath
Caveman’s Spring Boot
How to ScaleHow to avoid
Port conflicts
Manage on
multiple hosts
How to manage
when hosts in
trouble ?
How to update
them ?
How to keep up
Desired vs Actual
states?
Where are my
containers ??

10. @kamesh_sampath

11. Open Container Initiative (OCI)
ImageSpecRuntime Spec (cri-o)
https://cri-o.io
https://www.opencontainers.org/
https://www.opencontainers.org/image-spec
e.g. Docker , rkt e.g. Docker formatted Images
docker.io/busybox
The Runtime Specification outlines
how to run a “filesystem bundle”
that is unpacked on disk
A container image package with
required metadata that will be used by
runtimes to run the container images

12. ▪ Greek for “Helmsman,” also the root of the
word “Governor” (from latin: gubernator)
▪ Container orchestrator
▪ Supports multiple cloud and bare-metal
environments
▪ Inspired by Google’s experience with containers
▪ Open source, written in Go
▪ Manage applications, not machines
Meet Kubernetes

13. Pods
A group of whales is commonly referred to as a pod and a pod usually consists a
group of whales that have bonded together either because of biological reasons
or through friendships developed between two or more whales.
In many cases a typical whale pod consists of anywhere from 2 to 30 whales or
more.*
*http://www.whalefacts.org/what-is-a-group-of-whales-called/

14. OpenShift is Enterprise Kubernetes

15. Pod
Replication
Controller/
Deployment
Service Label
✓ 1+ containers
✓ Shared IP
✓ Shared storage volume
✓ Shared resources
✓ Shared lifecycle
✓ Ensures that a
specified
number of pod
replicas are
running at any
one time
✓ Grouping of
pods (acting as
one) has stable
virtual IP and
DNS name
✓ Key/Value pairs
associated with
Kubernetes objects
(env=production)
Kubernetes Cluster

16. My Boot is Kube Awesome
JVM Configurations
Operating System
MyApp.jar
OCI

17. DEMO (Hello Boot k8s deployment)

18. @kamesh_sampath
Better Spring Boot Microservices Platform circa 2016
Config Server
NETFLIX Ribbon

19. ▪ Service Discovery
Spring Discovery Client using Kubernetes Service
Discovery
▪ ConfigMap Property Source
How to use Kubernetes ConfigMap as Spring
Property source
▪ Zipkin Service Discovery
Using Zipkin with Kubernetes for distributed tracing
Spring Cloud Kubernetes

20. @kamesh_sampath
How to add to My Project?
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-discovery</artifactId>
<version>0.2.0.RELEASE</version>
</dependency>
Spring Cloud Kubernetes Discovery Spring Cloud Kubernetes Config
Spring Cloud Kubernetes Archaius
Spring Cloud Kubernetes Netflix
Spring Cloud Kubernetes Zipkin
https://github.com/spring-cloud-incubator/spring-cloud-kubernetes
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-config</artifactId>
<version>0.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-archaius</artifactId>
<version>0.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-netflix</artifactId>
<version>0.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-config</artifactId>
<version>0.2.0.RELEASE</version>
</dependency>

21. DEMO (Discovery)

22. @kamesh_sampath
Better Spring Boot Microservices Platform circa 2017
Config Server
NETFLIX Ribbon

23. @kamesh_sampath
Better Spring Boot Microservices Platform circa 2018
Config Server
NETFLIX Ribbon
Jaeger
Istio

24. Canary release is a technique to reduce the risk of introducing a new
software version in production by slowly rolling out the change to a
small subset of users before rolling it out to the entire infrastructure and
making it available to everybody.
Source: https://martinfowler.com/bliki/CanaryRelease.html
Microservice Architecture - Principles
Canary Release

26. Canary Deployment
DEVELOPMENT QA STAGING PRODUCTION ROUTER USERS
SCM

27. Canary Deployment
DEVELOPMENT QA STAGING PRODUCTION ROUTER USERS
SCM

28. Canary Deployment
DEVELOPMENT QA STAGING PRODUCTION ROUTER USERS
SCM

29. Canary Deployment
DEVELOPMENT QA STAGING PRODUCTION ROUTER USERS
SCM

30. Canary Deployment
DEVELOPMENT QA STAGING PRODUCTION ROUTER USERS
SCM

31. Canary Deployment
DEVELOPMENT QA STAGING PRODUCTION ROUTER USERS
SCM

32. Canary Deployment
DEVELOPMENT QA STAGING PRODUCTION ROUTER USERS
SCM

33. Canary Deployment
DEVELOPMENT QA STAGING PRODUCTION ROUTER USERS
SCM

34. Canary Deployment
DEVELOPMENT QA STAGING PRODUCTION ROUTER USERS
SCM

35. Canary Deployment
DEVELOPMENT QA STAGING PRODUCTION ROUTER USERS
SCM

36. Demo

37. ▪ Minishift and Minikube
▪ Fabric8 Maven Plugin
▪ Eureka & Ribbon not required with Kubernetes
▪ Demos
○bit.ly/springboot-on-openshift
○Spring Cloud Brewery Application Migration
■bit.ly/green-cloud-demo
■bit.ly/green-cloud-demo-sources
○Stateful Canary leveraging Infinispan
■bit.ly/popdemo
●Open Containers Initiative
○ Runtime Spec - http://cri-o.io/
○ Image Spec – https://github.com/opencontainers/image-spec
Summary @kamesh_sampath

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@kamesh_sampath kamesh.sampath@hotmail.com
bit.ly/springboot-on-openshift