App Connect

Deploy a simple flow onto Red Hat OpenShift using the App Connect Dashboard

By AMAR SHAH posted 15 days ago

  

This blog is part of a series. For the whole series list see here

Scenario 2b:  Deploy a simple flow onto Red Hat OpenShift using the App Connect Dashboard

 

In Scenario 2a we introduced the App Connect “operator”. This works as a sort of digital assistant to help us look after App Connect containers. In that scenario, we used the operator to deploy a container via the Kubernetes command line. In this scenario, we’re going to do exactly the same deployment but instead through a user interface known as the App Connect Dashboard.

What is the App Connect Dashboard

The App Connect Dashboard is a user interface that provides a simplified way to deploy BAR files within App Connect containers, and administer them once live. Some of the facilities it provides are:

  • A guided step by step user interface through which to deploy a bar file in a container.
  • An internal content server on which to host your BAR files ready for deployment.
  • A simplified way to create and view the yaml file required by the App Connect operator, including creation and referencing of any “configurations” required.
  • A view of the integration servers deployed in containers, which enables you to drill down to the individual message flows within them.
  • The ability to not just create integration servers as we will in this scenario, but also to update them (change number of replicas, change to a different fixpack or BAR file, update configuration objects etc.) and delete them too. These are not of course unique to the dashboard, as they could be done from the command line too.

Note that we described both “operators” and “configurations” in Scenario 2a should you need to go back and refresh your understanding of them.

Clearly the dashboard provides some powerful convenience features, but it does require some additional installation steps, configuration, and slightly increases the footprint on your installation. This is why we have made it optional, since some will prefer to use just the command line option.

Creating App Connect Dashboard Instance

The Dashboard code is actually part of the operator that we installed in Scenario 2a, so if you have not done that yet, install the App Connect Operator.

To keep the footprint light, the operator does not automatically install an instance of the App Connect Dashboard, so you’ll need to do that next.

Before you create the App Connect Dashboard instance, you must decide what type of storage to use for uploaded or imported BAR files

The following storage types can be used to allocate storage for ACE Dashboard content server

  • Ephemeral storage – The files are stored on the dashboard’s internal file system. Simple configuration, but any loaded BAR files will be deleted if the dashboard instance is restarted.
  • Long term storage – The dashboard can be configured to use a persistent volume provisioned for the container or a Simple Storage Service (S3) storage system. This ensures the files remain on dashboard restart, but requires more configuration.

For our simple scenario an ephemeral storage type will work just fine and will be the quickest/simplest to install. However, note that if you want to change to a different storage type later, you will need to re-install the dashboard.

You can create an App Connect Dashboard instance from the IBM Cloud Pak for Integration Platform Navigator, the Red Hat OpenShift web console or CLI, or the CLI for a Kubernetes environment. The steps to create an instance of the dashboard and  information of each of the storage types are here.

Launching the App Connect Dashboard

You can launch dashboard user interface from the OpenShift console, or from the IBM Automation hub ( previously known as Platform Navigator) if you have installed ‘Cloud pak for Integration’.

  •  Launching from the OpenShift Console

You can find the URL for App Connect Dashboard user interface from OpenShift console as highlighted in the image below

                    



  • Launching the dashboard from the IBM Automation Hub


The ACE Dashboard instance is listed under Integrations panel in IBM Automation Hub as highlighted below.  Click on the dashboard instance name to launch the user interface.

Exploring the App Connect Dashboard

The dashboard home page (shown below) has different tiles that tells you how many integration applications are currently deployed , how many integration servers are running  as well as a tile  to create a new integration server.


Note that if you did Scenario 2a then you should be able to see the integration server you deployed previously using the CLI. This is because we set createDashboardUsers: true in the integration server definition file.

Deploying a BAR file using App Connect Dashboard

Finally we are ready to begin our deployment of the simple flow.

  1. From the App Connect Dashboard, start the integration server deployment by clicking create a server’ from the Home page, or from the Servers or Integrations page (accessed by clicking Dashboard in the navigation pane).

 

  1. Select Quick Start toolkit integration option as we will be deploying a BAR file that contains a message flow developed using App Connect Toolkit.


Click ‘Next’ which takes you to the next screen where you can input the BAR file.

 

  1. In the Integrations panel, upload the exported BAR file to the dashboard’s internal content server.


  1. After uploading the BAR file, click Next which takes you to the next page where you can define dynamic configurations that you would like to apply to your integration server.



In Scenario 2a we required a configuration object because the App Connect container required the credentials to connect to an external Git Hub repository. In this scenario, the container will be drawing from the dashboard’s internal content repository, so no configuration for that is required. Furthermore, our current simple demo does not require configuration objects to connect to any resources at runtime either.   Therefore, we can skip this stage and go the next and final step of deploying the integration server. 

  1. Click ‘Next’ and it will take you to the IntegrationServer resource definition page where you can provide metadata for your Integration Server.



For our simple demonstration purpose we define following values and leave the rest of the fields to their default values.

    • Name of Integration Server : simple-echo-app
    • Version of ACE fixpack :12. 0.1.0-r3 (note that you can choose a specific version, or choose a “channel” like 12.0.1, which will ensure the latest fixpack of 12.0.1 is used for the deployment)
    • Accept the License with appropriate value from drop down list
    • of Replicas : 2 (default value is 1. Set  it to >1 for High Availability)



These values are used to create the YAML definition file just like the one we created by hand in Scenario 2a. Indeed you can see and even edit the generated YAML file, by clicking on the “YAML editor” tab. This is the exact same YAML that can be used for deploying Integration Server via command line or use in scripts for deployments using CI/CD pipeline, but a much easier way of creating it if you’re not familiar with the core contents.
When the deployment completes, the integration server is displayed as a tile on the Servers page, and the deployed integration can be viewed from the Integrations page or by clicking the integration server tile.


You can drill down into Integration Server and view the deployed applications  and the message flows under each application.

 

Testing the message flow

First, verify the status of your Application  by looking at pod log

$ oc logs <pod name>

2021-10-26 10:16:06.172262: BIP2155I: About to 'Start' the deployed resource 'HTTPEcho' of type 'Application'.

An http endpoint was registered on port '7800', path '/Echo'.

2021-10-26 10:16:06.218826: BIP3132I: The HTTP Listener has started listening on port '7800' for 'http' connections.

2021-10-26 10:16:06.218973: BIP1996I: Listening on HTTP URL '/Echo'.

 

As you would have noticed that we deployed two replicas of Integration Server for high availability purpose.    The Integration server tile on the ACE dashboard displays the no. of replicas currently configured and running.  You can verify it via command line too by running following command :

 

$ oc get pods

NAME                                             READY   STATUS      RESTARTS   AGE

simple-echo-app-is-7bcbc4bbf-l8mls                1/1     Running     0          3d20h

simple-echo-app-is-7bcbc4bbf-zcdzq                1/1     Running     0          3d20h

 Identify the public endpoint ( routes ) for the http service

$ oc get routes

NAME                    HOST/PORT   

simple-echo-app-http    simple-echo-app-http-ace-demo.apps.cp4i-2021-demo.cp.fyre.ibm.com

simple-echo-app-https   simple-echo-app-https-ace-demo.apps.cp4i-2021-demo.cp.fyre.ibm.com

 

The HOST/PORT entry  as highlighted above forms the external base URL for invoking the webservice .

From the pod logs we saw that the deployed  HTTPEcho service is listening on service endpoint “/Echo”.  So the complete URL to invoke the service would be :

http:// simple-echo-app-http-ace-demo.apps.cp4i-2021-demo.cp.fyre.ibm.com/Echo


Invoke the service using routes

Now test the message flow by invoking the service URL using browser  as shown below.

If you see the Echo response above, then you have managed to call your deployed flow.

Performing and administering deployments using the dashboard, performs exactly the same actions on the underlying Kubernetes platform as you would have done if using the command line. You can swap between command line and user interface as you please, using whichever is the most effective for the job in hand. 





Acknowledgement and thanks to Kim Clark for providing valuable  inputs to this article.

#IntegrationBus(IIB)#AppConnectEnterprise(ACE)#Docker#redhatopenshift #App-Connect-Operator



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