Health Check - Node.js Booster

Important

While you can run and interact with this booster on localhost, you cannot take advantage of using the health check functionality with this booster without using OpenShift. For more details on using this booster with a single-node OpenShift cluster, CI/CD deployments, as well as the rest of the runtime, see the Node.js Runtime Guide.

Important

This booster requires Node.js 8.x or greater and npm 5 or greater.

Important

As part of the process of creating this booster, developers.redhat.com/launch or the Fabric8 Launcher tool set up a project with a CI/CD deployment of this booster. You can see the status of this deployment in your Single-node OpenShift Cluster or OpenShift Online Web Console.

Running the Booster Locally

To run this booster on your local host:

$ git clone [email protected]:abdou31/miniprojet

$ cd miniprojet

$ npm install && npm start

Interacting with the Booster Locally

To interact with your booster while its running, use the form at http://localhost:8080 or the curl command:

$ curl http://localhost:8080/api/greeting
{"content":"Hello, World!"}

$ curl http://localhost:8080/api/greeting?name=Sarah
{"content":"Hello, Sarah!"}

Running the Booster on a Single-node OpenShift Cluster

If you have a single-node OpenShift cluster, such as Minishift or Red Hat Container Development Kit, installed and running, you can also deploy your booster there. A single-node OpenShift cluster provides you with access to a cloud environment that is similar to a production environment.

To deploy your booster to a running single-node OpenShift cluster:

1. Log in and create your project.

   $ oc login -u developer -p developer
   
   $ oc new-project MY_PROJECT_NAME
   
   $ npm install && npm run openshift

Interacting with the Booster on a Single-node OpenShift Cluster

To interact with your booster while it’s running on a Single-node OpenShift Cluster, you first need to obtain it’s URL:

$ oc get route booster-health-check-nodejs -o jsonpath={$.spec.host}

booster-health-check-nodejs-MY_PROJECT_NAME.LOCAL_OPENSHIFT_HOSTNAME

You can use the form at your application’s url or you can use the curl command:

$ curl http://booster-health-check-nodejs-MY_PROJECT_NAME.LOCAL_OPENSHIFT_HOSTNAME/api/greeting
{"content":"Hello World!"}

$ curl http://booster-health-check-nodejs-MY_PROJECT_NAME.LOCAL_OPENSHIFT_HOSTNAME/api/greeting?name=Sarah
{"content":"Hello Sarah!"}

$ curl http://booster-health-check-nodejs-MY_PROJECT_NAME.LOCAL_OPENSHIFT_HOSTNAME/api/stop

$ oc get pods -w
NAME                           READY     STATUS    RESTARTS   AGE
booster-health-check-nodejs-1-26iy7   1/1       Running   5          18m

When READY changes to 0/1, if you re-execute a curl command to api/greeting or attempt to access the application’s URL, it will be unavailable. When READY changes back to 1/1, curl commands and the application URL will be available again.

More Information

You can learn more about this booster and rest of the Node.js runtime in the Node.js Runtime Guide.