4. Troubleshooting on OpenShift Operations Training

4.1 Troubleshooting basics

Mon, 01 Jan 0001 00:00:00 +0000

In chapter 3 you got to know the monitoring components, its rules and more. Now, imagine you get an alert. “Where to begin?”, you ask. How do you find out what’s amiss and led to the alert?

That’s what we are going to look at in this first lab.

Task 4.1.1: Cluster operators

As you already know, OpenShift 4 usually consists of about 30 different operators. Each operator is responsible that the actual state of the cluster matches the desired, configured state. If this is not the case, the operator tells us.

4.2 Evictions

Mon, 01 Jan 0001 00:00:00 +0000

This second troubleshooting lab will go into detail on what evictions are, how to analyze and how to avoid them.

Task 4.2.1: Setup

First, let’s get set up. Create a new namespace using the following command:

Warning

It is essential that you use this command or else this lab won’t work!

oc create namespace <namespace>

Now, deploy a test pod into the freshly created namespace using the provided definition: