import ballerina/http;
// Note that the code below is completely focused on the business logic and it does not specify anything related to operations.
listener http:Listener helloEP = new(9090);
service http:Service /helloWorld on helloEP {
resource function get sayHello() returns string {
return "Hello, World from service helloWorld ! \n";
}
}
KubernetesBallerina supports generating Docker and Kubernetes artifacts from code without any additional configuration.
This simplifies the experience of developing and deploying Ballerina code in the cloud.
Code to cloud builds the containers and required artifacts by deriving the required values from the code.
If you want to override the default values taken by the compiler, you can use a |
import ballerina/http;
listener http:Listener helloEP = new(9090);
Note that the code below is completely focused on the business logic and it does not specify anything related to operations.
service http:Service /helloWorld on helloEP {
resource function get sayHello() returns string {
return "Hello, World from service helloWorld ! \n";
}
}
# Before you build the package, we are going to override some of the default values taken by the compiler,
In order to do this you need to create a filed named `Cloud.toml` in package directory and paste the following content into it.
All the supported key value properties can be found in the Code to cloud deployment guide.
[container.image]
repository="wso2inc"
name="hello"
tag="v0.1.0"
Additionally, if you are using minikube, you could execute the following command to reuse the Docker daemon from minikube.
$ eval $(minikube docker-env)
# Now let's build the ballerina package.
# Note that the `bal build` command should be executed on the package. Code to cloud generates only one container per package.
$ bal build
Compiling source
wso2/hello:0.1.0
Creating balas
target/bala/hello-2020r2-any-0.1.0.bala
Running Tests
wso2/hello:0.1.0
No tests found
Generating executables
target/bin/hello.jar
Generating artifacts...
@kubernetes:Service - complete 1/1
@kubernetes:Deployment - complete 1/1
@kubernetes:HPA - complete 1/1
@kubernetes:Docker - complete 2/2
Execute the below command to deploy the Kubernetes artifacts:
kubectl apply -f /home/wso2/project/target/kubernetes/hello-0.1.0
Execute the below command to access service via NodePort:
kubectl expose deployment wso2-hello-0--deployment --type=NodePort --name=wso2-hello-0--svc-local
# Let’s try executing the Docker image separately first.
# Verify if the Docker image is generated.
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
wso2inc/hello v0.1.0 60d95f0928b2 About a minute ago 228MB
# Run the generated Docker image.
$ docker run -d -p 9090:9090 wso2inc/hello:v0.1.0
c04194eb0b4d0d78cbc8ca55e0527d381d8ab4a1a68f8ea5dd3770a0845d5fbb
# Access the service.
$ curl http://localhost:9090/helloWorld/sayHello
Hello, World from service helloWorld !
# Lets try executing Kubernetes service now.
$ kubectl apply -f /home/wso2/project/target/kubernetes/hello-0.1.0
service/helloep-svc created
deployment.apps/wso2-hello-0--deployment created
horizontalpodautoscaler.autoscaling/wso2-hello-0--hpa created
# Verify the kubernetes pods.
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
wso2-hello-0--deployment-7d4d56457b-7jlzx 1/1 Running 0 57s
# Expose via Nodeport to test in the developer environment.
$ kubectl expose deployment wso2-hello-0--deployment --type=NodePort --name=wso2-hello-0--svc-local
service/wso2-hello-0--svc-local exposed
# Get the IP and port of the Kubernetes service.
$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
wso2-hello-0--svc-local NodePort 10.111.61.112 <none> 9090:32437/TCP 4m17s
# If you are using Minikube, IP address should be changed according to the output of the `minikube ip` command.
$ minikube ip
192.168.49.2
# Access the deployed service via CURL.
$ curl http://192.168.49.2:32437/helloWorld/sayHello
Hello, World from service helloWorld !
