Chapter 2. Features

The Red Hat build of Node.js for s390x platform is supported only in OpenShift environments provisioned on IBM Z infrastructure. Running an Node.js application on a stand-alone installation of RHEL on IBM Z is not supported.

New images for products supported on IBM Z are available in the Red Hat Container Catalog.

To deploy the example applications on OpenShift environments provisioned on IBM Z infrastructure, specify the relevant IBM Z image name in the package.json file and commands.

Some of the example applications also require other products, such as Red Hat Data Grid to demonstrate the workflows. In this case, you must also change the image names of these products to their relevant IBM Z image names in the YAML file of the example applications.

The Secured example application in Node.js requires Red Hat SSO 7.3. Since Red Hat SSO 7.3 is not supported on IBM Z, the Secured example is not available for IBM Z.

Opossum is a circuit breaker for Node.js. Red Hat build of Node.js provides a fully supported @redhat/opossum module.

The circuit breaker pattern is used to reduce the impact of network failure and high latency on service architectures, where services asynchronously invoke other services.

The @redhat/opossum module is available for download from the Red Hat Customer registry. The modules with the @redhat namespace should be downloaded from the Red Hat registry and all the other modules should be downloaded from the npm registry. To specify the download paths, create a .npmrc file in the root directory of your application with the following code:

@redhat:registry=https://npm.registry.redhat.com
registry=https://registry.npmjs.org

After specifying the download paths, to install the @redhat/opossum module in your application enter the following command:

$ npm install @redhat/opossum

To work with the @redhat/opossum module add the following code to your application:

const CircuitBreaker = require(‘@redhat/opossum’)