Using Redhat Developer subscription for creating openshift cluster - openshift

I have RedHat Developer Subscription For Individual users in my active subscriptions I had already bought that one. But I don't know how to use it while creating a new OpenShift Container Platform cluster. I was only able to create 60 day trial cluster. How can I use the developer subscription while creating the new cluster. If anyone know please help with this one.

RedHat has launched Openshift Developer Sandbox. You can try and deploy applications on this sandbox for free.
You can signup and Start using immediately: https://developers.redhat.com/developer-sandbox/get-started
RedHat Developer Subscription For Individual users is focused on providing no-cost RHEL to customers.

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I have created a web application as a private developer for a friends company. All the code lives within my personal Azure Dev Ops portal and at present has a pipeline configured to build and a release configured to release to a web application within my Azure tenant.
How can I now create a new release pipeline so that the code will be published to the a web application within the companies official Azure tenant?
We have created an Azure subscription and a web application using my friends company office 365 account but I somehow need to grant access or authorise my personal Azure Devops portal to publish.
After a lot of searching and playing it would seem there are many many ways to do this. In the end I went down the route of adding my friends work account to my Azure DevOps project so that they could create a service connection by authorising with their Office 365 account.
Once done I gained access to the subscription when creating the release.

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What is the difference between application console vs cluster console in openshift enterprise version. I am new to openshift and confused with terminologies. I feel that openshift is like linux kernel in our system(an analogy). On top of that are containers and to orchestrate we have kubernetes. However , the architecture of openshift is exact opposite. Please correct me.
OpenShift is just one of the available Kubernetes distributions, which adds enterprise-level services like authentication, authorization and multitenancy.
The web console provides two perspectives: Administrator and Developer. The Developer perspective provides workflows specific to developer use cases like create, deploy and monitor applications, while Administrator perspective is responsible for managing the cluster resources, users, and projects. Depending on the user's role, you will see a different set of views available in the main menu.

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I have some SUSE, RedHat and Cent OS VM's in Google Cloud. Now I want to patch these servers. Is there any GCP in-built tool or third party tool need to use ?
#Jannatul, you've asked about "GCP in-built tool or third party tool" in your question.
The answer to the first part of the question regards "GCP in-built tool" is "No". The OS deployment images in GCE are kept updated, but after deployment it's up-to-you how to keep VM instances patched. At this time Google does not provide any cloud service for that purpose since such a tool is out of scope of IaaS that the GCE actually is.
As for the second part ("third party tool"), an approach to Linux patching is not GCP-specific, it should be similar to that you use in the private datacenter. Since you use commercial Linux'es, including Red Hat and Suse, that vendors' solutions could work for your needs: for example Suse Manager or Red Hat Satellite (both originate from Spacewalk and support various Linux clients), as well as open-source Spacewalk Project solution itself.
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Service is free for the first 100 VMs.

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I'm working on an architecture to deploy my webapp. I would like to use Google Managed Instance Groups because I have some strict requirements. I was wondering:
which is the best Web container to be deployed in a distributed environment?
I'm familiar with Tomcat, it's Tomcat OK to be deployed in an instance group?
my Webapp running on tomcat will generate logs that will be stored in the current machine hosting tomcat. How should I handle distributed application logs.
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thanks for help
In order to have a centralized place for Openshift services and projects logs, you can always deploy the EFK stack (which provides a Kibana UI to view any logs)
https://docs.openshift.com/enterprise/3.2/install_config/aggregate_logging.html