Creating an application with a Spring Boot code sample

Note: The Spring Boot code sample uses the 8081 HTTP port.

Before you begin creating an application with this devfile code sample, Dockerize app with Dockerfile and Finally helm char to test in Openshift

First, test de demo, right click on file: DemoApplication.java and select option: Run Java

Appears something like:

...TomcatWebServer : Tomcat started on port(s): 8080 (http)

To test, navigate to: localhost:8080

Stops the Run Test

To dockerize the demo, run this command:

docker build -f docker/Dockerfile -t juancvilla/springboot:4.0 .
docker image ls

To Publish you docker navigate and enter with your credentias to: https://hub.docker.com/

Go to repositories, and create a new repository: juancvilla/springboot with TAG: 4.0

Go back to the command line and run this command:

docker push juancvilla/springboot:4.0
docker image ls

To test the docker run this command:

docker run -p 8081:8081 juancvilla/springboot:4.0

To test, navigate to: localhost:8081

Stops the docker

To publish in Openshift, we will use helm chart. To create a helm structure:

helm create springboot-demo

Edit the file values.yaml:

Edit line 10:  repository: juancvilla/springboot
Edit line 14:  tag: "4.0"
Edit line 55:  type: NodePort
Edit line 57:  port: 8081
Edit lines 89-96:
#livenessProbe:
#  httpGet:
#    path: /
#    port: http
#readinessProbe:
#  httpGet:
#    path: /
#    port: http

Edit file: Chart.yaml

Edit line 24:# appVersion: "1.16.0"

Run the following commands to test on Openshift:

oc login --token=sha256~z31_QeR274gszXIsDZjS0z3ijyIF1lKHd0000O7xoFc --server=https://api.sandbox-m3.1530.p1.openshiftapps.com:6443
helm install myspringboot springboot-demo
oc get svc
oc expose svc myspringboot-demo

Fin