In this tutorial, you’ll download a simple Node.js app from GitHub that returns an index page with various information about itself, in response to an HTTP request. You’ll open up and edit the app’s deployment descriptor, a file containing information about the app, including memory requirements, hostname and more.
Step 1: Find the sample app on GitHub
Step 2: Download sample files
This tutorial is preparing the app for deployment to the SAP BTP, Cloud Foundry runtime, and you’ll be deploying it (in another tutorial) from your own machine. So you’ll need to download the repository first.
Choose Clone or download and then choose Download ZIP.
Enter the name of the file you just downloaded and choose Validate.
Step 3: Extract sample files
Open the zip file and extract its content to a folder on your local computer. You will have extracted a folder named cf-sample-app-nodejs-master
.
Step 4: Open the deployment descriptor
The sample app repository contains a basic deployment descriptor, but you’ll need to edit it before the deployment. The deployment descriptor is the file called manifest.yml
in the root of the app folder structure.
Open the manifest.yml
file with an editor of your choice.
What is the value of the name
parameter that exists already in the manifest.yml
?
Step 5: Add a unique host name to the deployment descriptor
The host name for your app must be unique within a combination of region and runtime, in that it forms the most significant part of the fully qualified hostname in the app’s URL space. For example, if your app host name is myapp
, the fully qualified hostname for the Cloud Foundry runtime in the EU10
region will be:
myapp.cfapps.eu10.hana.ondemand.com
If someone else is already using that hostname within that region and runtime, you won’t be able to deploy your application.
-
Add a parameter named host
to the manifest.yml
file and provide a unique value. For example, use your birth date or a random number or string or incorporate your user ID:
The YAML format uses whitespace significantly – make sure you format this new parameter correctly, as shown.
-
Don’t forget to save your changes.
