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Creating A Sample Application

NERC's OpenShift service is a platform that provides a cloud-native environment for developing and deploying applications.

Here, we walk through the process of creating a simple web application, deploying it. This example uses the Node.js programming language, but the process with other programming languages will be similar. Instructions provided show the tasks using both the web console and the command-line tool.

Using the Developer perspective on NERC's OpenShift Web Console

  1. Go to the NERC's OpenShift Web Console.

  2. Click on the Perspective Switcher drop-down menu and select Developer.

  3. In the Navigation Menu, click +Add.

  4. Creating applications using samples: Use existing code samples to get started with creating applications on the OpenShift Container Platform. Find the Create applications using samples section and then click on "View all samples" and then select the type of application you want to create (e.g. Node.js, Python, Ruby, etc.), it will load application from Git Repo URL and then review or modify the application Name for your application. Alternatively, If you want to create an application from your own source code located in a git repository, select Import from Git. In the Git Repo URL text box, enter your git repo url. For example: You may see a warning stating "URL is valid but cannot be reached". You can ignore this warning!

  5. Click "Create" to create your application.

  6. Once your application has been created, you can view the details by clicking on the application name in the Project Overview page.

  7. On the Topology View menu, click on your application, or the application circle if you are in graphical topology view. In the details panel that displays, scroll to the Routes section on the Resources tab and click on the link to go to the sample application. This will open your application in a new browser window. The link will look similar to http://<appname>-<mynamespace>

Additional resources

For more options and customization please read this.

Using the CLI (oc command) on your local terminal

Alternatively, you can create an application on the NERC's OpenShift cluster by using the oc new-app command from the command line terminal.

i. Make sure you have the oc CLI tool installed and configured on your local machine following these steps.


Some users may have access to multiple projects. Run the following command to switch to a specific project space: oc project <your-project-namespace>.

ii. To create an application, you will need to specify the language and runtime for your application. You can do this by using the oc new-app command and specifying a language and runtime. For example, to create a Node.js application, you can run the following command: oc new-app nodejs

iii. If you want to create an application from an existing Git repository, you can use the --code flag to specify the URL of the repository. For example: oc new-app --code If you want to use a different name, you can add the --name=<newname> argument to the oc new-app command. For example: oc new-app –name=mytestapp The platform will try to automatically detect the programming language of the application code and select the latest version of the base language image available. If oc new-app can't find any suitable Source-To-Image (S2I) builder images based on your source code in your Git repository or unable to detect the programming language or detects the wrong one, you can always specify the image you want to use as part of the new-app argument, with oc new-app <image url>~<git url>. If it is using a test application based on Node.js, we could use the same command as before but add nodejs~ before the URL of the Git repository. For example: oc new-app nodejs~

Important Note

If you are using a private remote Git repository, you can use the --source-secret flag to specify an existing source clone secret that will get injected into your BuildConfig to access the repository. For example: oc new-app --source-secret=yoursecret.

iv. Once your application has been created, You can run oc status to see if your application was successfully built and deployed. Builds and deployments can sometimes take several minutes to complete, so you may run this several times. you can view the details by running the oc get pods command. This will show you a list of all the pods running in your project, including the pod for your new application.

v. When using the oc command-line tool to create an application, a route is not automatically set up to make your application web accessible. Run the following to make the test application web accessible: oc create route edge --service=mytestapp --insecure-policy=Redirect. Once the application is deployed and the route is set up, it can be accessed at a web URL similar to http://mytestapp-<mynamespace>

For more additional resources

For more options and customization please read this.

Using the Developer Catalog on NERC's OpenShift Web Console

Here, we walk through the process of creating a simple RStudio web server template that bundles all resources required to run the server i.e. ConfigMap, Pod, Route, Service, etc. and then initiate and deploy application from that template.

This example template file is readily accessible from the Git Repository.

  1. Find the From Local Machine section and click on Import YAML as shown below:

    Import YAML

  2. On opened YAML editor paste the content of template copied from the rstudio-server-template.yaml file located at the provided Git Repo.

    YAML Editor

  3. You need to find the Developer Catalog section and then select All services option as shown below:

    Select All Services

  4. Then, you will be able to use the created Developer Catalog template by searching for it on catalog as shown below:

    Search for RStudio Template

  5. Once selected by clicking the template, you will see initiate template web interface as shown below:

    Initiate Template

  6. Based on our template definition, we request that users input a preferred password for the RStudio server so the following interface will prompt for your password that will be used during login the RStudio server.

    Provide the RStudio Password

  7. Once successfully initiated, you can either open the application URL using the Open URL icon as shown below or you can naviate to the Routes section and click on Location path as shown below:

    How to get the RStudio Application URL

  8. To get the Username to be used for login on RStudio server, you need to click on running pod i.e. rstudio-server as shown below:

    Detail Information for RStudio Pod

  9. Then select the YAML section to find out the attribute value for runAsUser that is used as the Username while Sign in to RStudio server as shown below:

    Username for RStudio Server from Pod runAsUser

  10. Finally, you will be able to see the RStudio web interface!