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Mastering Kubernetes

You're reading from   Mastering Kubernetes Dive into Kubernetes and learn how to create and operate world-class cloud-native systems

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Product type Paperback
Published in Jun 2023
Publisher Packt
ISBN-13 9781804611395
Length 746 pages
Edition 4th Edition
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Author (1):
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Gigi Sayfan Gigi Sayfan
Author Profile Icon Gigi Sayfan
Gigi Sayfan
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Toc

Table of Contents (21) Chapters Close

Preface 1. Understanding Kubernetes Architecture 2. Creating Kubernetes Clusters FREE CHAPTER 3. High Availability and Reliability 4. Securing Kubernetes 5. Using Kubernetes Resources in Practice 6. Managing Storage 7. Running Stateful Applications with Kubernetes 8. Deploying and Updating Applications 9. Packaging Applications 10. Exploring Kubernetes Networking 11. Running Kubernetes on Multiple Clusters 12. Serverless Computing on Kubernetes 13. Monitoring Kubernetes Clusters 14. Utilizing Service Meshes 15. Extending Kubernetes 16. Governing Kubernetes 17. Running Kubernetes in Production 18. The Future of Kubernetes 19. Other Books You May Enjoy
20. Index

Collecting metrics with Kubernetes

Kubernetes has a Metrics API. It supports node and pod metrics out of the box. You can also define your own custom metrics.

A metric contains a timestamp, a usage field, and the time range in which the metric was collected (many metrics are accumulated over a time period). Here is the API definition for node metrics:

type NodeMetrics struct {
    metav1.TypeMeta
    metav1.ObjectMeta
    Timestamp metav1.Time
    Window    metav1.Duration
    Usage corev1.ResourceList
}
// NodeMetricsList is a list of NodeMetrics.
type NodeMetricsList struct {
    metav1.TypeMeta
    // Standard list metadata.
    // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
    metav1.ListMeta
    // List of node metrics.
    Items []NodeMetrics
}

The usage field type is ResourceList, but it’s actually a map of a resource name to a quantity:

// ResourceList is a set of (resource name, quantity...
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