Istio is a service mesh cloud platform that helps to run a distributed microservice architecture; it provides a uniform way to secure, connect, and monitor microservices. The platform makes it easy to create a network of deployed services with load balancing, service-to-service authentication, monitoring, and more, without any changes in service code. After a developer builds a microservice, he/she needs to create a container image and a set of YAML files to deploy the microservice into Istio mesh. Most of the time, these parts are not part of the programming experience. Ballerina is a cloud native programming language that understands the architecture around it. It is capable of auto-generating deployment artifacts like Docker images and Kubernetes YAMLs. This session will discuss the advantage of having a service mesh and a cloud native programing language in your microservice application ecosystem. The session will also demonstrate how a developer can deploy from source to Istio service mesh by adding a set of annotations in the source code.

1. Source to Service Mesh with Ballerina and Istio
Lakmal Warusawithana
@lakwarus

2. In the old days...
We write a program, build it and then
just run that program.

3. Now...
We write it, build it and then have
various ways of running it;

4. .balx
ballerina build <source.bal>

5. FROM ballerina/ballerina
COPY demo.balx /home/ballerina
EXPOSE 9090
CMD ballerina run demo.balx
Create a Dockerfile

6. $> docker build -t my-app .
Sending build context to Docker daemon 7.168kB
Step 1/4 : from ballerina/ballerina
---> a65975411327
Step 2/4 : COPY demo.balx /home/ballerina
---> 3b4e481bef57
Step 3/4 : EXPOSE 9090
---> d95a1292b232
Step 4/4 : CMD ballerina run demo.balx
---> 2698c40bdadd
Successfully built 2698c40bdadd
Successfully tagged my-app:latest
Create the docker image

7. $> docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
my-app latest 2698c40bdadd 1 minute ago 128MB
List the docker image

8. $>docker run -it -p 9090:9090 my-app
ballerina: initiating service(s) in 'demo.balx'
ballerina: started HTTP/WS endpoint 0.0.0.0:9090

9. Ballerina natively understand Docker

10. Lets see how we can run our app in the
Kubernetes?
Now...

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

12. $>kubectl apply -f deployment.yaml
deployment.extensions "my-app-deployment" created
$>kubectl get pods
NAME READY STATUS RESTARTS AGE
my-app-666f4f4bbf 1/1 Running 0 50s

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

14. $>kubectl apply -f my-app-service.yaml
service "hello-service" created
$>kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
my-app NodePort 10.110.136.115 <none> 9090:31657/TCP 5m

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

18. Ballerina natively understand Kubernetes

19. Book Shop Composite App
caller Book Shop
response
Book Details Book Review
Book id
Book details
Book reviews

20. Overview of Service Mesh and Istio

24. Ballerina natively understand Istio

25. Q & A

26. THANK YOU