Serverless is a misnomer, your future cloud native applications will consist of both microservices and functions, wrapped as Linux containers, but in many cases where you the developer ignore the operational aspects of managing that infrastructure. In this session we get started using Function as a Service (FaaS) engine with Apache OpenWhisk deployed on Kubernetes and OpenShift. With Kubernetes/OpenShift being de-facto platform for Cloud Native Java Applications, we will explore on to see how to make Cloud Native Java Applications a.k.a Microservices can complement the serverless Functions. This technical intensive session will open up one of the possible serverless web application architecture where we deploy an API Gateway into the FaaS platform to draw the curtains up to see the microservices talking to the serverless functions. This session ends with us seeing how Event Sinks and Event Sources map in the Serverless World.

1. Serverless and Servicefull
Where Microservices compliments Serverless
@burrsutter burr@redhat.com
bit.ly/dnl_serverfull

2. Demo: bit.ly/msa-instructions
Slides: bit.ly/microservicesdeepdive
Video Training: bit.ly/microservicesvideo
Free eBooks from developers.redhat.com
bit.ly/reactivemicroservicesbookbit.ly/javamicroservicesbook
Microservices Introductory
Materials
@burrsutter
Advanced Materials
bit.ly/istio-tutorial
bit.ly/dnl_serverfull
Kubernetes for Java Developers
learn.openshift.com/servicemesh
bit.ly/faas-tutorial
learn.openshift.com/serverless

3. bit.ly/mono2microdb
@burrsutter

4. bit.ly/istio-book
@burrsutter

5. Keynote Demo 2018
@burrsutter
https://youtu.be/hu2BmE1Wk_Q?t=477

6. “Our ancestors called it
magic, but you call it
[computer] science.
I come from a land where
they are one and the same.”
—THOR

7. Monolith
MyApp
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8. Modules
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9. Microservices
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10. Microservices
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11. Microservices
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12. Microservices
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13. Microservices
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14. Network of Services - Mesh
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15. Microservices own their Data
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16. Multiple Points of Entry
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17. Microservices embedding Capabilities
@burrsutter
Container
JVM
Service B
Discovery
Load-balancer
Resiliency
Metrics
Tracing
Container
JVM
Service A
Discovery
Load-balancer
Resiliency
Metrics
Tracing
Container
JVM
Service C
Discovery
Load-balancer
Resiliency
Metrics
Tracing
Before Istio

18. Microservices externalizing Capabilities
@burrsutter
Pod
Container
JVM
Service A
Sidecar Container
Pod
Container
JVM
Service C
Sidecar Container
Pod
Container
JVM
Service B
Sidecar Container
After Istio

19. Failure of a Service
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X

20. Cascading Failure
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X
X
X
X
X
X
X

21. MyService
Monitoring
Tracing
API
Discovery
Invocation
Resilience
Pipeline
Authentication
Logging Elasticity
Microservices'ilities + Istio
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22. “Change is the essential
process of all of existence.”
—SPOCK

23. Let there be Functions
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24. Microservices Serverless
Functions
Your Control
Long-Lived Processes
Known Programming Model
Often Sync Request-Response
Mature:
IDE Integration
Debuggers
Tracers
Monitoring
CI/CD
Cloud Control
Short-Lived Processes
New Programming Model
Event-Driven Async
Immature:
?
@burrsutter

25. The first question is “is there a suitable service I can
consume?” before “is there something I can buy and
set up using a cloud provider?”.
Thoughtworks Nov 29 2017

26. @burrsutter
It is Serverless, because of SaaS
(managed by another party services).

27. Serverless Defined
Serverless architectures refer to applications that significantly depend on third-party services
(knows as Backend as a Service or "BaaS") or on custom code that's run in ephemeral
containers (Function as a Service or "FaaS"), the best known vendor host of which currently is
AWS Lambda. By using these ideas, and by moving much behavior to the front end, such
architectures remove the need for the traditional 'always on' server system sitting behind an
application. Depending on the circumstances, such systems can significantly reduce
operational cost and complexity at a cost of vendor dependencies and (at the moment)
immaturity of supporting services.
https://martinfowler.com/articles/serverless.html
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28. It is all about the Services
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29. API
Gateway
-as-a-
Service
HTTP Input/Output Service
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30. API
Gateway
-as-a-
Service
SSO-as-a-
Service
A
P
I
Authentication Service
@burrsutter

31. Storage-as-a-Service
A
P
I
API
Gateway
-as-a-
Service
SSO-as-a-
Service
A
P
I
File Storage Service
@burrsutter

32. Storage-as-a-Service
A
P
I
API
Gateway
-as-a-
Service
Cache-as-a-
Service
API
DB-as-a-
Service
API
SSO-as-a-
Service
A
P
I
Data Services
@burrsutter

33. Storage-as-a-Service
A
P
I
API
Gateway
-as-a-
Service
Messaging
-as-a-
Service
A
P
I
Cache-as-a-
Service
API
DB-as-a-
Service
API
Notifications
-as-a-
Service
A
P
I
A
P
I
SSO-as-a-
Service
A
P
I
Connectivity Services
@burrsutter

34. Storage-as-a-Service
A
P
I
API
Gateway
-as-a-
Service
My
Microservice
A
My
Microservice
B
My
Microservice
C
Messaging
-as-a-
Service
A
P
I
Cache-as-a-
Service
API
DB-as-a-
Service
API
Notifications
-as-a-
Service
A
P
I
A
P
I
SSO-as-a-
Service
A
P
I
Your Containerized Services
@burrsutter

35. Storage-as-a-Service
A
P
I
API
Gateway
-as-a-
Service
My
Microservice
A
Function
1
My
Microservice
B
My
Microservice
C
Function
2
Function
3
Function
4
Messaging
-as-a-
Service
A
P
I
Cache-as-a-
Service
API
DB-as-a-
Service
API
Notifications
-as-a-
Service
A
P
I
A
P
I
SSO-as-a-
Service
A
P
I
Event-Driven Input
Function
5
@burrsutter

36. Storage-as-a-Service
A
P
I
API
Gateway
-as-a-
Service
My
Microservice
A
Function
1
My
Microservice
B
My
Microservice
C
Function
2
Function
3
Function
7
Function
4
Function
6
Messaging
-as-a-
Service
A
P
I
Cache-as-a-
Service
API
DB-as-a-
Service
API
Notifications
-as-a-
Service
A
P
I
A
P
I
SSO-as-a-
Service
A
P
I
Event-Driven Output
Function
5
@burrsutter

37. Storage-as-a-Service
A
P
I
API
Gateway
-as-a-
Service
My
Microservice
A
Function
1
My
Microservice
B
My
Microservice
C
Function
2
Function
3
Function
7
Function
4
Function
6
Messaging
-as-a-
Service
A
P
I
Cache-as-a-
Service
API
DB-as-a-
Service
API
Notifications
-as-a-
Service
A
P
I
A
P
I
SSO-as-a-
Service
A
P
I
Synergy
Function
5
@burrsutter

38. FaaS Kubernetes Players

39. Business Logic
Application
Data
Containers
OS
Virtualization
Server, Storage,
Network
Container
as a Service
Business Logic
Application
Data
Runtime
OS
Virtualization
Server, Storage,
Network
Infrastructure as
a Service
Business Logic
Application
Data
Containers
OS
Virtualization
Server, Storage,
Network
Platform
as a Service
Business Logic
Application
Data
Containers
OS
Virtualization
Server, Storage,
Network
Backend
as a Service
Business Logic
Application
Data
Containers
OS
Virtualization
Server, Storage,
Network
Function
as a Service
Platform Responsibilities
Business Logic
Application
Data
Runtime
OS
Virtualization
Server, Storage,
Network
On Premises

40. Apache OpenWhisk
● Open Source incubating under Apache
● A FaaS platform to execute functions written in:
○ JavaScript
○ Swift
○ Java
○ Python
○ PHP
○ Docker
○ Go
● Deployable on
○ Any platform where docker can be run
○ Kubernetes/OpenShift

41. Terms
● Actions
○ A stateless code snippet that gets executed (aka Functions)
● Package
○ A bundle of actions and feeds synonymous to Java Packages
● Feeds
○ Acts as Interface between external Event Sources and OpenWhisk Actions
● Triggers
○ Stimulus of external Events via Feeds
● Rules
○ Ties one or more Triggers to an Action or vice-versa
● Activation
○ Records the output/response of Running/Ran actions
@burrsutter

42. Action (aka Function) JavaScript
function main(params) {
console.log("JS msgaction args: %j", params);
Object.keys(params["body"]).forEach(function(key) {
console.log("%s: %j", key, params["body"][key])
});
return { payload: 'JavaScript on OpenWhisk on OpenShift ' + params.body.text};
}
wsk -i action update msgaction msgaction.js
wsk -i action invoke msgaction --param body '{"text":"my stuff"}' --result
{ “payload”: “JavaScript OpenWhisk on OpenShift my stuff” }
wsk -i activation get -l # see the details, logs
@burrsutter

43. Action (aka Function) Python
def main(params):
print "Py msgaction params: " + str(params)
for key in params["body"]:
print key, params["body"][key]
return { "payload" :
"Python on OpenWhisk on OpenShift " + str(params["body"]["text"])}
wsk -i action update msgaction msgaction.py
wsk -i action invoke msgaction --param body '{"text":"my stuff"}' --result
{ “payload”: “Python on OpenWhisk on OpenShift my stuff” }
wsk -i activation get -l # see the details, logs
@burrsutter

44. Action (aka Function) Java
public static JsonObject main(JsonObject params) {
System.out.println("msgaction params: " + params);
JsonObject body = params.get("body").getAsJsonObject();
for (Map.Entry<String, JsonElement> entry : body.entrySet()) {
System.out.println(entry.getKey() + " " + entry.getValue().getAsJsonPrimitive().getAsString());
}
JsonObject response = new JsonObject();
response.addProperty("payload", "Java on OpenWhisk on OpenShift " +
params.getAsJsonObject("body").get("text").getAsString());
return response;
}
wsk -i action update msgaction target/actionjava.jar --main com.example.FunctionApp
wsk -i action invoke msgaction --param body '{"text":"my stuff"}' --result
{ “payload”: “Java on OpenWhisk on OpenShift my stuff” }
wsk -i activation get -l # see the details, logs
mvn clean package

45. maven archetype
mvn archetype:generate
-DarchetypeGroupId=org.apache.openwhisk.java
-DarchetypeArtifactId=java-action-archetype
-DarchetypeVersion=1.0-SNAPSHOT
-DgroupId=com.example
-DartifactId=actionjava
-Dversion=1.0-SNAPSHOT
-DinteractiveMode=false
bit.ly/faas-tutorial
learn.openshift.com/serverless
@burrsutter

46. OpenWhisk
On
OpenShift
(bit.ly/faas-tutorial)
@burrsutter

47. Serverless and Servicefull
Where Microservices compliments Serverless
@burrsutter burr@redhat.com
bit.ly/dnl_serverfull