The lab at DevNexus on MicroProfile, Docker, Kubernetes, Istio and Open Shift

1. 1
Hands-on cloud-native Java
microservices with Eclipse
MicroProfile, Docker,
Kubernetes and Istio
Emily Jiang
Java Champion
STSM, IBM
Liberty Microservice Architect, Advocate
Senior Lead for MicroProfile and CDI
@emilyfhjiang

2. 2
Agenda
• Introduction to MicroProfile
• Introduction to Open Liberty
• Introduction to the Lab
• Summary
• Time to code!

3. 3
Community
Driven
Lightweight, Iterative
Processes
Specs, APIs, TCKs
NO Reference
Implementation

4. 4
MicroProfile Community
● Over a dozen vendors and Java
user groups
● 166 individual contributors
● Over half a dozen independent
implementations

5. 5
 Open specifications
 Wide vendor support
 REST services
 OpenAPI support
 Security
 Fault Tolerance
 Configuration
 Metrics
 Health
 Open Tracing
https://wiki.eclipse.org/MicroProfile/Implementation
Quarkus

6. 6
 Open specifications
 Wide vendor support
 REST services
 OpenAPI support
 Security
 Fault Tolerance
 Configuration
 Metrics
 Health
 Open Tracing
https://wiki.eclipse.org/MicroProfile/Implementation
Quarkus

7. 7
7
MicroProfile 1.0 (Fall 2016)
JAX-RS 2.0
CDI 1.2
MicroProfile 1.1 (August 2017)
microProfile-1.0
Config 1.0
MicroProfile 1.2 (Sept 2017)
MicroProfile-1.1
Config 1.1
Fault Tolerance 1.0
Health 1.0
Metrics 1.0
JWT 1.0
2017
2018
MicroProfile 1.3 (Dec 2017)
MicroProfile 1.2
Config 1.2
Metrics 1.1
OpenApi 1.0
OpenTracing 1.0
RestClient 1.0
MicroProfile 1.4 (June 2018)
MicroProfile 1.3
Config 1.3
Fault Tolerance 1.1
JWT 1.1
Open Tracing-1.1
Rest Client-1.1
2019
MicroProfile 2.0.1 (July 2018)
MicroProfile 1.4
JAX-RS 2.1 // Java EE 8
CDI 2.0 // Java EE 8
JSON-P 1.1 // Java EE 8
JSON-B 1.0 // Java EE 8
MicroProfile 2.1 (Oct
2018)
MicroProfile 2.0
OpenTracing 1.2
MicroProfile 2.2 (Feb 2019)
Fault Tolerance 2.0
OpenAPI 1.1
OpenTracing 1.3
Rest Client 1.2
MicroProfile 3.0 (June
2019)
MicroProfile 2.1
Metrics 2.0
Health Check 2.0
Rest Client 1.3
MicroProfile 3.2 (Nov 2019)
MicroProfile 3.0
Metrics 2.2
Health Check 2.1
2020
MicroProfile 3.3 (Feb 2020)
MicroProfile 3.2
Config 1.4
Metrics 2.3
Fault Tolerance 2.1
Health 2.2
Rest Client 1.4
11 releases

8. 8
Eclipse MicroProfile
Health Metrics
Fault
Tolerance
Open API Config
Open Tracing
JWT
JSON-BRest ClientJAX-RSCDI JSON-P LRA
GraphQL
Reactive
Streams
Operators
Reactive
Messaging
Context
Propagation
earlyevolutionspecifications

9. 9
openliberty.io
Jan Dec
20.0.0.2
20.0.0.1 20.0.0.3
4-week release cadence

10. 10
https://github.com/OpenLiberty/tutorial-microprofile

11. 11
There’s a good chance you’ll use REST APIs

12. 12
Eclipse MicroProfile
JAX-RS JSON-PCDIRest Client JSON-B
microprofile.io

13. 13
JAX-RS
B
@ApplicationPath("System")
public class SystemApplication extends
Application {}
@Path("properties")
public class PropertiesResource {
@GET
@Produces(MediaType.APPLICATION_JSON)
public JsonObject getProperties() {…}
}

14. 14
CDI
BA
public class InventoryManager {
@Inject
private SystemClient systemClient;
…
}

15. 15
JSON-B & JSON-P
A B
...
@GET
@Produces(MediaType.APPLICATION_JSON)
public InventoryList listContents() {
return manager.list();
}
public class InventoryList {
private List<SystemData> systems;
public InventoryList(List<SystemData> systems) {
this.systems = systems;
}
public List<SystemData> getSystems() {
return systems;
}
public int getTotal() {
return systems.size();
}
}

16. 16
MicroProfile REST Client
BA
@Inject
@RestClient
private SystemClient defaultRestClient;
@Dependent
@RegisterRestClient
@RegisterProvider(UnknownUrlExceptionMapper.class)
@Path("/properties")
public interface SystemClient {
@GET
@Produces(MediaType.APPLICATION_JSON)
public Properties getProperties() throws
UnknownUrlException, ProcessingException;
}
io.openliberty.guides.inventory.client.SystemClient/mp-rest/url=http://localhost:9080/system

17. 17
https://github.com/OpenLiberty/tutorial-microprofile

18. 18
Handling 100s of Services

19. 19
Eclipse MicroProfile
JAX-RS JSON-PCDI
Config
Fault
Tolerance
JWT
Propagation
Open API
Rest Client JSON-B
microprofile.io

20. 20
MicroProfile OpenAPI
A B
openapi: 3.0.0
info:
title: Inventory App
description: App for storing JVM system properties of various
hosts.
license:
name: Eclipse Public License - v 1.0
url: https://www.eclipse.org/legal/epl-v10.html
version: "1.0"
servers: - url: http://localhost:{port} description: Simple Open
Liberty.
variables:
port:
description: Server HTTP port.
default: "9080"
paths:
/inventory/systems:
get:
summary: List inventory contents.
description: Returns the currently stored host:properties pairs
in the inventory.
operationId: listContents
responses:
200:
description: host:properties pairs stored in the inventory.
content:
application/json:
schema:
$ref: '#/components/schemas/InventoryList’
….
http://localhost:9080/openapi/ui

21. 21
MicroProfile JWT
A B
@GET
@RolesAllowed({ "admin", "user" })
@Path("{hostname}")
@Produces(MediaType.APPLICATION_JSON)
public Response getPropertiesForHost(@PathParam("hostname") String hostname,
@Context HttpHeaders httpHeaders) {…}

22. 22
MicroProfile Fault Tolerance
A B
@Fallback(fallbackMethod = "fallbackForGet")
public Properties get(String hostname) throws
IOException {
return invUtils.getProperties(hostname);
}

23. 23
A
MicroProfile Config
B
@Inject
@ConfigProperty(name = ”customer_name")
private String customer;
config_ordinal=100
customer_name=Bob
{
"config_ordinal":150,
”customer_name":Tom
}

24. 24
https://github.com/OpenLiberty/tutorial-microprofile

25. 25
Handling 100s of collaborating services requires a strong operations
focus

26. 26
Eclipse MicroProfile
Health Metrics Open Tracing
microprofile.io
JAX-RS JSON-PCDI
Config
Fault
Tolerance
JWT
Propagation
Open API
Rest Client JSON-B

27. 27
MicroProfile Health
A B
@Readiness
@ApplicationScoped
public class InventoryResource implements HealthCheck {
...
public boolean isHealthy() {...}
@Override
public HealthCheckResponse call() {
if (!isHealthy()) {
return
HealthCheckResponse.named(“ServiceHealthCheck”).withData(…).down().build();
}
return
HealthCheckResponse.named(“ServiceHealthCheck”).withData(…).up().build();
}
}

28. 28
MicroProfile Metrics
A B
@Timed(name = "inventoryPropertiesRequestTime",
absolute = true,
description = "Time needed to get the properties of" +
"a system from the given hostname")
public Properties get(String hostname) {
return invUtils.getProperties(hostname);
}

29. 29
MicroProfile OpenTracing
A B
@Traced(value = true, operationName = "InventoryManager.list")
public InventoryList list() {
return new InventoryList(systems);
}
JAX-RS methods are
automatically
traced by default

30. 30
https://github.com/OpenLiberty/tutorial-microprofile

31. 31
How to get started?

32. 32
Microservice Deployment
microprofile.io
Kubernetes IstioDocker
HealthMetrics Open Tracing
JAX-RS JSON-PCDI
Config
Fault
Tolerance
JWT
Propagation
Open API
Rest Client JSON-B

33. 33
Think Warszawa / September 17th, 2019 / © 2019 IBM Corporation 33
Containers
docker build -t ol-runtime --no-cache=true .
docker run -d --name rest-app -p 9080:9080 -p
9443:9443 -v <absolute path to
guide>/start/target/liberty/wlp/usr/servers:/servers ol-
runtime

34. 34
Think Warszawa / September 17th, 2019 / © 2019 IBM Corporation 34
Kubernetes

35. 35
Red Hat OpenShift is a leading hybrid
cloud, enterprise Kubernetes application
platform, trusted by 1000+ organizations.

36. 36
Kubernetes OpenShift
Multi-container, multi-host scheduling ✅ ✅
Self-service provisioning ✅ ✅
Service discovery ✅ ✅
Persistent Storage ✅ ✅
Multi-tenancy ✅
Networking (SDN) ✅
Image Registry ✅
Image Build Tools ✅
Metrics ✅
Log Aggregation ✅
Ingress ✅
UX: Console, Service Catalog, "oc" ✅
Secured by Default ✅
@burrsutter - bit.ly/9stepsawesome

37. 37
Kubernetes
Kube Native
App
Helmed
App
Kubernetes Ingress
Kubernetes CLI
Kubernetes API
@burrsutter - bit.ly/9stepsawesome

38. 38
RHEL
Ansible/Terraform/Operators
OVN
Kubernetes
Kube Native
App
OpenShift
Specialized
Java Services
---
Any
Language
Any
Framework
OpenShift Native
App
Operated/Helmed
App
RHT Storage
Quay
Telemetry
(EFK/Profana)
Admin
Console
Kubernetes Ingress OpenShift Routes
Kubernetes CLI OpenShift CLI
Kubernetes API OpenShift API
Che
Templates/S2I/BC
OpenShift Mesh/Istio
Knative
@burrsutter - bit.ly/9stepsawesome

39. 39
MicroProfile Config with Kubernetes
A B
env:
- name: GREETING
valueFrom:
configMapKeyRef:
name: greeting-config
key: message
kubectl create configmap greeting-config --from-literal
message=Greetings...
@Inject
@ConfigProperty(name = "GREETING")
private String greeting;

40. 40
MicroProfile Health with Kubernetes
A B
readinessProbe:
httpGet:
path: /health/ready
port: 9080
initialDelaySeconds: 15
periodSeconds: 5
failureThreshold: 1

41. Challenges
▸Security
▸Application roll out
▸A/B testing
▸Canary deployments
• Circuit breaking
• Rate limiting
• Observability
• Requires lot of coding

42. Service mesh
▸ A network of services, not just bytes
Observability
Resiliency
Traffic control
Security
Policy enforcement

43. Istio
A service mesh designed to connect, manage and secure micro
services

44. 44
Istio

45. 45
openliberty.io

46. 46
Summary
• MicroProfile - Java APIs for cloud-native applications
o Produce and consume REST services
o Handle faults, security, configuration, APIs
o Monitor health, metrics and trace request flows
• Open Liberty - Java platform for cloud-native applications
o Open Source, Simple, Lightweight, Fast
o Supports latest MicroProfile and Java EE APIs
o Flexible package to suit your Microservices

47. 47
Useful links
• https://microprofile.io
• https://jakarta.ee/
• https://openliberty.io/
• https://github.com/openliberty/open-liberty
• http://groups.io/g/openliberty
• https://stackoverflow.com/questions/tagged/open-liberty
• http://www.eclipse.org/openj9/
• https://openliberty.io/guides/
• https://www.eclipse.org/community/eclipse_newsletter/2019/september/microprofile.php

48. 4848
Thank You!
&
enjoy the lab!
https://github.com/OpenLiberty/tutorial-microprofile