Exposing Your Application to the Outside World

In this lab, we’re going to make our application visible to the end users, so they can access it.

Application architecture

Background: Routes

While Services provide internal abstraction and load balancing within an OpenShift environment, sometimes clients (users, systems, devices, etc.) outside of OpenShift need to access an application. The way that external clients are able to access applications running in OpenShift is through the OpenShift routing layer. And the data object behind that is a Route.

The default OpenShift router (HAProxy) uses the HTTP header of the incoming request to determine where to proxy the connection. You can optionally define security, such as TLS, for the Route. If you want your Services, and, by extension, your Pods, to be accessible from the outside world, you need to create a Route.

Exercise: Creating a Route

You may remember that when we deployed the parksmap application, we un-checked the checkbox to create a Route. Normally it would have been created for us automatically. Fortunately, creating a Route is a pretty straight-forward process. You simply expose the Service via the command line. Or, via the Administrator Perspective, just click Networking → Routes and then the Create Route button.

Insert parksmap in Name field.

From Service field, select parksmap. For Target Port, select 8080.

In Security section, check Secure route. Select Edge from TLS Termination list.

Leave all other fields blank and click Create:

Create Route1
Create Route2

When creating a Route, some other options can be provided, like the hostname and path for the Route or the other TLS configurations.

When using the command line, we can first verify that we don’t already have any existing Routes:

oc get routes
No resources found.

Now we need to get the Service name to expose:

oc get services
NAME       CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
parksmap   172.30.169.213   <none>        8080/TCP   5h

Once we know the Service name, creating a Route is a simple one-command task:

oc create route edge parksmap --service=parksmap
route.route.openshift.io/parksmap exposed

Verify the Route was created with the following command:

oc get route
NAME       HOST/PORT                            PATH      SERVICES   PORT       TERMINATION   WILDCARD
parksmap   parksmap-user3.apps.cluster-test-efcf.test-efcf.example.opentlc.com             parksmap   8080-tcp   edge          None

You can also verify the Route in the Developer Perspective under the Resources tab for your parksmap deployment configuration. Also note that there is a decorator icon on the parksmap visualization now. If you click that, it will open the URL for your Route in a browser.

Route created

This application is now available at the URL shown in the Developer Perspective. Click the link and you will see it.

Note
 At first time, the Browser will ask permission to get your position. This is needed by the Frontend app to center the world map to your location, if you don’t allow it, it will just use a default location.
Empty map