Task 1 - Hello World

This example demonstrates a simple Camel K integration that periodically prints a “Hello World from Camel K”. Let’s recap the simple architecture of this example:

Let’s begin!

☐ Make sure you have the terminal in VSCode opened and you are logged to OpenShift
☐ oc new-project helloworld - create a new project with the name ‘helloworld’
☐ oc get csv - shows operators that have been installed to the cluster by the cluster administrator and are available for use, you should be seeing the Camel K operator running
☐ Create a helloworld.groovy file. This file specifies the time period in ms for which the message will be printed in the line from('timer:tick?period=3000'). The second line specifies the message to be printed. The last line prints it to the terminal.

☐ kamel run helloworld.groovy - run the integration using kamel

It might take up to 3 minutes for the integration to run.

☐ oc get integrations - check if the integration is running
☐ kamel logs helloworld - get the logs of the running integration

You will see the hello world message printing out in the terminal every 3 seconds.
You can achieve the same by running the command with --logs argument in the beginning: kamel run helloworld.groovy --logs

☐ kamel run helloworld.groovy --dev - now let’s try running the integration in the dev mode
☐ change the from('timer:tick?period=3000') to from('timer:tick?period=5000') in the helloworld.groovy file

The running integration will reload, a few seconds later you will see the hello world message printing out in the terminal every 5 seconds

☐ oc delete project helloworld - clean up the namespace