This slide deck explores how Ballerina specializes in writing microservices and deploying them into Kubernetes and Istio without having to write YAMLs and dockerfiles.

1. Microservices in Practice with Ballerina,
Kubernetes and Istio
November 2019
Lakmal Warusawithana, Senior Director - Cloud Architecture, WSO2
@lakwarus

2. Why Microservices?

3. Agility

6. Let’s write a
Microservice

7. Inherently Async I/O

8. JSON as a native type
json is just a union - () | int | float | string | map<json> | json[]
// JSON object
json payload = { "orderdata": { "id": 1, "name": "XYZ", "price": 2500 } };
//Access object values
json orderid = payload.orderdata.id;
//JSON arrays
json orders = {
"orderdata": [
{ "id": 1, "name": "XYZ", "price": 2500 },
{ "id": 2, "name": "ABC", "price": 3000 }
]
};

9. XML as a native type
// Simple XML literal
xml x1 = xml`<name>Lakmal Warusawithana</name>`;
// XML with namespaces
xmlns "http://wso2.com" as ns0;
xml x2 = xml `<name id="123" status="married">
<ns0:fname>Lakmal</ns0:fname>
<ns0:lname>Warusawithana</ns0:lname>
</name>`;
// XML literal with interpolation
string lastName = "Warusawithana";
xml x3 = xml`<lname>${lastName}</lname>`;
// Concat XML values
xml x4 = x1 + x2 + x3;

10. Let’s deploy the
Microservice

13. apiVersion: apps/v1
kind: Deployment
metadata:
name: hello-deployment
labels:
app: hello
spec:
replicas: 1
selector:
matchLabels:
app: hello
template:
metadata:
labels:
app: hello
spec:
containers:
- name: hello
image: hello:latest
imagePullPolicy: "IfNotPresent"
ports:
- containerPort: 9090
Create a deployment.yaml

14. apiVersion: "v1"
kind: "Service"
metadata:
labels:
app: "hello"
name: "hello"
spec:
ports:
- port: 9090
protocol: "TCP"
targetPort: 9090
selector:
app: "hello"
type: "NodePort"
Create a service.yaml

16. However, those parts are not part of
the programming experience for the
developer.

17. Ballerina Cloud Native
Support

18. ● @kubernetes:Deployment{}
● @kubernetes:Service{}
● @kubernetes:Ingress{}
● @kubernetes:HPA{}
● @kubernetes:Secret{}
● @kubernetes:ConfigMap{}
Supported K8s and Istio Kinds
● @kubernetes:PersistentVolumeClaim{}
● @kubernetes:ResourceQuota{}
● @kubernetes:Job{}
● @openshift:Route{}
● @istio:Gateway{}
● @istio:VirtualService{}

19. ● Ballerina helps to write Microservices by providing
network abstraction as first class language constructs
● Ballerina natively understand Cloud Native platforms
like Docker, Kubernetes and Istio.
● Ballerina removes gap between developers and Ops.
● Ballerina and Kubernetes support agile development to
deployment and improve productivity.
Takeaways

20. How to get involved
Learn more
Open source
Get support
http://ballerina.io
http://github.com/ballerina-platform/
Stack Overflow #ballerina tag