February 2021
Intermediate to advanced
188 pages
4h 23m
English
Content preview from Certified Kubernetes Application Developer (CKAD) Study Guide
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.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.
Chapter 5. Observability
Applications running in containers do not operate under the premise of “fire and forget.” Once the container has been started, you’ll want to know if the application is ready for consumption and is still working as expected in an hour, a week, or a month. The Observability section of the exam addresses the concern.
In this chapter, we’ll discuss container health probes—more specifically, startup, readiness, and liveness probes. You’ll learn about the different health verification methods and how to define them for the proper use cases. Moreover, the exam expects you to be familiar with strategies for debugging a misconfigured or misbehaving Kubernetes object. We’ll round out the chapter by ttalking about monitoring cluster nodes and Pods.
At a high level, this chapter covers the following concepts:
-
Readiness probe
-
Liveness probe
-
Startup probe
-
Troubleshooting Kubernetes objects
-
Monitoring
Understanding Health Probing
Even with the best automated test coverage, it’s nearly impossible to find all bugs before deploying software to a production environment. That’s especially true for failure situations that only occur after operating the software for an extended period of time. It’s not uncommon to see memory leaks, deadlocks, infinite loops, and similar conditions crop up once the application has been put under load by end users.
Proper monitoring can help with identifying those issues; however, you still need to take an action to mitigate the ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.