June 2021
Intermediate to advanced
271 pages
7h 19m
English
Content preview from Hybrid Cloud Apps with OpenShift and Kubernetes
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Chapter 8. Working Example of Multicluster Application Delivery
Let’s take a look at a simple working example of a web application with a backing datastore. For our purposes, we will deploy an app that mimics the game PAC-MAN game from Atari. A user will interact with a dynamic frontend that stores information in a backing MongoDB.
We will deploy this application across multiple distinct clusters using the techniques discussed in Chapter 5. Each of the clusters will be provisioned from a hub running Open Cluster Management, as discussed in Chapter 6. Further, we will configure an external load balancer provided by a GSLB service hosted by F5. Incoming user requests will be routed from a global domain into one of the specific clusters. If any one of the clusters or the application experiences a problem, then user requests will no longer be routed to that cluster. We are going to go a little further and demonstrate how to integrate off-cluster resources like an F5 DNS Load Balancer Cloud Service, and we will integrate a ServiceNow change ticket into the example.
In Figure 8-1, we see our PAC-MAN application running on two OpenShift clusters with a load balancer routing traffic to app instances on either cluster. We can see the hub cluster with various resources that are helping to manage the overall system. Through the rest of this chapter, we will explain what these various parts are doing and provide a walk-through that you can do on your own to experiment with all of the moving ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.