This document discusses cloud native programming with Docker and Kubernetes. It introduces Ballerina annotations that allow developers to build Docker images directly from Ballerina code. The annotations configure Docker image names, ports, and registries. Ballerina's build command then automatically generates Dockerfiles and builds images. Similarly, Kubernetes annotations are introduced to deploy Ballerina services to Kubernetes clusters for cloud native deployment.

1. Cloud Native Programing with Docker and
Kubernetes
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. However, those parts are not part of
the programming experience for the
developer.

5. Microservice Influence
Plan Code Build Test Release Deploy Operate

6. Cloud Native Deployment

9. Ballerina
Builder Extension

10. Ballerina Docker Annotation
import ballerina/http;
import ballerinax/docker;
@docker:Expose{}
endpoint http:Listener listener{
port:9090
};
@docker:Config {
registry:”abc.com”,
name:”hello-world”
tag:”v.1.0”
}
service<http:Service> helloWorld bind listener
{
}
Import ballerinax/docker
Import docker annotation package
@docker:Expose{}
Opening communication from outside
@docker:Config{}
Set Docker Image name with proper registry
URL and a tag

11. Ballerina Docker Annotation
$> ballerina build hello_world.bal
@docker - complete 3/3
Run following command to start docker container:
docker run -d -p 9090:9090 abc.com/hello-world:v.1.0
$> tree
.
├── hello_world.bal
├── hello_world.balx
└── docker
└── Dockerfile
$> docker images
REPOSITORY TAG IMAGE ID CREATED
abc.com/hello-world v.1.0 df83ae43f69b 2 minutes ago
Ballerina Build
Output folder structure
Binary balx and corresponding Dockerfile is
created
Docker Image
abc.com/hello-world:v.1.0 Docker image
created

12. K8S Annotation
Demo

14. Build your own builder extension
https://ballerina.io/learn/how-to-exten
d-ballerina/

15. Q & A

16. THANK YOU