January 2019
Intermediate to advanced
484 pages
11h 48m
English
Content preview from DevOps with Kubernetes - Second Edition
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Quality of Service (QoS) classes
Kubernetes only uses requests to schedule pods, so the summation of limits from all pods scheduled to the same node might exceed the node's capacity. We can have, for example, a node with 1 Gi memory, but the total limits from all pods on the node could be 1.1 Gi or more. This model allows Kubernetes to oversubscribe a node, hence leading to higher resource utilization. Nonetheless, the allocatable resources on a node is finite. If a pod without any resource limit exhausts all resources and causes an out of memory event on a node, how does Kubernetes ensure that other pods can still get their requested resources? Kubernetes approaches this problem through ranking pods by their QoS classes.
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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.
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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.